Answer:
A) Rapid chemical reaction where gas is released.
Explanation:
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The process of an antacid tablet reacting in water is a rapid chemical reaction characterized by the release of gas. This occurs when components like calcium carbonate in the antacid neutralize stomach acid, producing calcium chloride, water, and carbon dioxide gas.
Explanation:When an antacid tablet is placed in water, the best description of the process is a rapid chemical reaction where gas is released. Antacid tablets typically contain Arrhenius bases like Al(OH)3, Mg(OH)2, CaCO3, and NaHCO3 that react with and neutralize stomach acid. For example, calcium carbonate reacts with hydrochloric acid in the stomach to produce calcium chloride, water, and carbon dioxide gas, leading to a reduction in acid and sometimes a belch from the released CO2.
CaCO3(s) + 2HCl(aq) = CaCl2(aq) + H2O(l) + CO2(g)
This reaction is an example of a neutralization reaction, which is a type of acid-base reaction, and in the case of antacids, it typically happens rapidly upon the dissolution and reaction of the antacid in the stomach's hydrochloric acid.
A balloon is filled with 35.0 L of helium in the morning when the temperature is 20.0C. By noon the temperature has risen to 45.0C. What is the new volume of the balloon?
A
2.5L
B
3.5L
C
4.5L
D
5.5L
Answer:
The question to your answer is: V2 = 78.75 l non if the options given
Explanation:
Data
V1 = 35 l
T1 = 20 °C
T2 = 45°C
V2 = ?
Formula
V1 / T1 = V2 / T2
Clear V2 from the equation
V2 = V1T2/T1
Substitution
V2 = (35)(45) / (20)
V2 = 78.75 l
Answer:
The new volume of the balloon is 78.75 L
Explanation:
Charles's law relates the volume and temperature of an ideal gas, to a constant pressure, therefore we must use that ratio to calculate the final temperature, according to the data provided:
Vinitial = 35 L
Tinitial = 20ºC
Vfinal = ?
Tfinal = 45ºC
Vfinal = (Vinitial x Tfinal)/Tinitial = (35 L x 45ºC)/20ºC = 78.75 L
When the compound, Ca(NO3)2, is mixed with water, the Ca(NO3)2 is:
soluble because all Ca+2 compounds are soluble in water
insoluble because most Ca+2 compounds are insoluble in water
soluble because all NO3−1 compounds are soluble in water
insoluble because NO3−1 compounds are usually insoluble in water
Answer:
The answer t your question is below:
Explanation:
When a salt is mixed with water, it will form ions, these ions are soluble in water.
Example: Ca(NO3)2 ⇒ Ca⁺² + 2 NO₃⁻¹
Both Ca⁺² and NO₃⁻¹ are soluble in water.
Then the answer to your question is:
Soluble because all Ca+2 compounds are soluble in water
Soluble because all NO3−1 compounds are soluble in water
Ca(NO3)2 is soluble in water because all nitrate compounds are soluble in water regardless of the cation they are paired with.
Explanation:When the compound Ca(NO3)2 is mixed with water, the Ca(NO3)2 is soluble because all NO3−1 compounds are soluble in water. This is generally based on the solubility rules of ionic compounds in water where all nitrates (NO3-) are soluble, regardless of the cation they are paired with. Thus, in spite of the solubility trends of calcium (Ca+2), the nitrate (NO3-) ion dictates the solubility of this compound in water, making it soluble.
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The information below describes a redox reaction.
What is the final, balanced equation for this reaction?
Answer:
The answer to your question is the first option
Explanation:
Just remember that to balance using this method,
first look for the elements that change their oxidation number, and
later count the number of electrons that changed,
later identify which element oxidazes and which reduces and
finally cross the number of electrons that change in each semireaction and write these numbers in the main reaction.
2Cr⁺³ (aq) + 6Cl⁻ (aq) ⇒ 2Cr(s) + 3Cl₂ (g)
2 Cr 2
6 Cl 6
Answer:
The answer is the first option
Explanation:
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In the first step of hydroboration mechanism, why is an arrow drawn from the pi bond of the alkene to the B atom of the borane reagent signifying the pi electrons are used to make a new C-B bond? See the background information presented with Part I.
Answer:
The borane reagent acts as a Lewis acid because it is electron-deficient.
Explanation:
The borane reagent is electron-deficient because it does not have a complete octet. Thus, it is electrophilic and accepts donation of the electrons from the alkene.
The electron deficiency of borane makes it electrophilic, driving its reactivity in the hydroboration reaction. Its eagerness to acquire electrons from the alkene initiates the process, enabling the formation of a C-B bond, which is essential in organic synthesis and serves as the basis for various chemical transformations.
The electron-deficient nature of the borane reagent plays a pivotal role in the hydroboration reaction, as it renders the borane electrophilic, ready to accept electron pairs from the alkene. This unique characteristic of borane can be attributed to its incomplete electron configuration, particularly the lack of a complete octet in its valence shell.
Borane (B2H6) is electron-deficient because boron, the central atom in borane, possesses only three valence electrons. This is in contrast to the octet rule, a fundamental principle in chemistry, which suggests that atoms tend to acquire a stable electron configuration, often characterized by eight electrons in their valence shell. Due to its deficiency of valence electrons, boron is left "wanting" more electrons to complete its octet.
The electron deficiency makes borane an electrophile, which is a species that is electron-hungry and seeks to gain additional electrons to achieve a stable electron configuration. In the hydroboration reaction, borane acts as an electrophile by accepting a pair of electrons from the pi bond of the alkene. This electron transfer results in the formation of a new carbon-boron (C-B) sigma (σ) bond, marking the initiation of the hydroboration process.
The electrophilic nature of borane, driven by its electron deficiency, allows it to participate in chemical reactions with nucleophiles, such as alkenes, where electron-rich species readily donate electron pairs. The resulting organoboron compound serves as a versatile intermediate for subsequent transformations in organic synthesis.
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Arrange the liquids pentane (CH3CH2CH2CH2CH3), pentanol (CH3CH2CH2CH2CH2OH), and pentanal (CH3CH2CH2CH2CHO) in order of decreasing viscosity, surface tension, and boiling point. Rank from highest to lowest viscosity, surface tension, and boiling point. To rank items as equivalent, overlap them.
Answer:
According to decreasing viscosity = pentanol > pentanal > pentane.
surface tension = pentanol > pentanal > pentane.
Boiling point = pentanol > pentanal > pentane.
Explanation:
pentane (CH3CH2CH2CH2CH3), pentanol (CH3CH2CH2CH2CH2OH), and pentanal (CH3CH2CH2CH2CHO) in order of decreasing viscosity, surface tension, and boiling point. They all have same sequence in which they are in order hydrogen bonding > dipole dipole interactions > van der waals dispersion forces.
Surface tension is the property of liquid's surface that resist the force and caused by the unbalance forces. Viscosity is related to liquid's resistance to being moved. This is caused by the friction between molecules and Branching decreasing the boiling point.
The boiling point of the compounds pentane (C2H6), pentanol (C3H8), and pentanal (C4H10) decreases in order of pentane > pentanol > pentanal.
Explanation:The boiling point of a substance is the temperature at which it changes from a liquid to a gas at a specific pressure. It is a characteristic physical property unique to each substance and depends on intermolecular forces. At the boiling point, the vapor pressure of the liquid equals the atmospheric pressure, allowing bubbles of vapor to form throughout the liquid. Water, for instance, boils at 100 degrees Celsius (212 degrees Fahrenheit) at sea level.
Thus, as per the given elements, they can be orderly arranged as - C2H6 < C3H8 < C4H10. All of these compounds are nonpolar and only have London dispersion forces: the larger the molecule, the larger the dispersion forces and the higher the boiling point.
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Which of the following statements is true?
Most nonmetals can be drawn into a wire, while metals would break apart.
Most metals can be drawn into a wire, while nonmetals would break apart.
Most metals and nonmetals conduct heat well, but nonmetals cannot conduct electricity.
Most metals and nonmetals conduct electricity well, but metals cannot conduct heat.
Answer:
Most metals can be drawn into a wire, while nonmetals would break apart.
Explanation:
Most of the metals can be drawn into wire without breaking because their tensile strength is high. This property of metals is known as ductility.
Non metals on the other hand do not have this ability because they are brittle and tend to break apart because their tensile strength is very low.
The examples of metals which are generally used for making wires are aluminium, iron, copper etc. and rarely gold and silver are used for making wires for expensive equipments like computers.
The true statement is that most metals can be drawn into a wire, while nonmetals would break apart. Most metals are malleable and ductile, and can conduct both heat and electricity, while nonmetals are brittle and are usually poor conductors.
Explanation:The correct statement among the options given is: 'Most metals can be drawn into a wire, while nonmetals would break apart.'
Most metals are malleable and ductile, meaning they can be reshaped without breaking. That's why we can draw them into wires. On the other hand, most nonmetals are brittle and would break or shatter if you tried to draw them into a wire. Similarly, while both metals and nonmetals can be thermal insulators or conductors, it is generally true that metals are good conductors of both heat and electricity, while nonmetals are poor conductors.
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Can someone help me on this?
Answer:
1propyl,3Ethyl,3methyl pentane
1. Alginate is
a. Reversible Hydrocolloid impression material
b. Irreversible Hydrocolloid impression material
c. Polysulfideimpression material
d. Polyvinyl siloxane impression material
Answer:
Option b, Irreversible hydrocolloid impression material
Explanation:
Irreversible is used as an impression material to take impression from edentulous jaws. It is also used in wound healing and drug delivery.
Alginate is a natural polymer found in cell wall of brown seaweed.
Its monomers are β-D-mannuronate and α-L-guluronate.
In association with Ca2+, it forms gel. It is hydrophilic in nature.
Identify the combustion reaction
The combustion reaction that can be identified is Al₂S₃ + 2Al + 3S and represents the combustion of aluminum sulfide (Al₂S₃), a compound of aluminum and sulfur.
Aluminum sulfide (Al₂S₃) reacts with oxygen (O₂) from the air to form aluminum oxide (Al₂O₃) and sulfur dioxide (SO₂). Aluminum oxide (Al₂O₃) is a white, solid compound that is often formed as a byproduct of aluminum smelting. which has found applications in various industrial applications, such as ceramics, pigments, and refractories.
Sulfur dioxide (SO₂) is a colorless gas with a pungent odor and is a major air pollutant that can cause respiratory problems and acid rain. Heat is released during the combustion reaction, which can be harnessed for various purposes, such as generating electricity or powering industrial processes.
Phosphorus can be prepared from calcium phosphate by the following reaction:
2Ca₃(PO₄)₂+6SiO₂+10C --> 6CaSiO₃+P₄+10CO
Phosphorite is a mineral that contains Ca₃(PO₄)₂ plus other non-phosphorus-containing compounds. What is the maximum amount of P₄ that can be produced from 1.0 kg of phosphorite if the phorphorite sample is 75% Ca₃(PO₄)₂ by mass? Assume an excess of the other reactants.
The maximum amount of tetraphosphorus (P4) that can be produced from 1.0 kg of 75% pure phosphorite is approximately 149.69 grams, considering the reaction with silicon dioxide and carbon in excess.
The student has asked about the amount of tetraphosphorus (P4) that can be produced from 1.0 kg of phosphorite, which is 75% calcium phosphate (Ca3(PO4)2) by mass, assuming an excess of the other reactants. In the industrial preparation of phosphorus, calcium phosphate is chemically reduced to form tetra phosphorus, which has several applications, including the manufacture of fertilizers, pesticides, and special alloys.
The first step is to calculate the mass of pure Ca3(PO4)2 available in the 1.0 kg of phosphorite. Since the phosphorite sample is 75% Ca3(PO4)2, this means there is 0.75 kg (or 750 g) of Ca3(PO4)2 present. Using the molar mass of Ca3(PO4)2 (310.18 g/mol) and the stoichiometry of the reaction, we find the corresponding moles of P4 produced.
For every 2 moles of Ca3(PO4)2 used, 1 mole of P4 is formed. Therefore, we calculate (750 g / 310.18 g/mol) / 2 = 1.208 mol of P4. To find the mass, we multiply the moles of P4 by its molar mass (123.89 g/mol), resulting in 149.69 g of P4 produced from 1.0 kg of phosphorite.
A sample of gas at a pressure of 121.59 kPa, a volume of 31 L, and a temperature of 360 K contains how many moles of gas? A. 0.71 mol B. 0.96 mol C. 1.3 mol D. 1.8 mol
Answer:
C. 1.3 mol
Explanation:
PV = nRT
where P is absolute pressure,
V is volume,
n is number of moles,
R is universal gas constant,
and T is absolute temperature.
Given:
P = 121.59 kPa
V = 31 L
T = 360 K
R = 8.3145 L kPa / mol / K
Find: n
n = PV / (RT)
n = (121.59 kPa × 31 L) / (8.3145 L kPa / mol / K × 360 K)
n = (3769.29 L kPa) / (2993.22 L kPa / mol)
n = 1.26 mol
Round to two significant figures, there are 1.3 moles of gas.
What is the pH of a solution made by mixing equal volumes of 1 M sodium acetate and 1 M acetic acid? (The pK of acetic acid is 4.76.)
a) 1
b) 3.76
c) 4.76
d) 5.76
Answer:
The pH is 4.76 (option C)
Explanation:
pH of a solution = TO BE DETERMNED
[sodium acetate] = 1M ; [acetic acid] = 1M
K = [H+] [A-] / [HA]
K = [H+] [1] / [1]
K = H
pH = pK
⇒ now pH is equal to pK
⇒ The value of pK is given which is 4.76
⇒ This means the value of the pH is also 4.76
Answer:
The pH is 4.76 (option C)
Explanation:
Explanation:
pH of a solution = TO BE DETERMNED
[sodium acetate] = 1M ; [acetic acid] = 1M
Argon, which comprises almost 1% of the atmosphere, is approximately 27 times more abundant than CO 2, but does not contribute to global warming. Which explanation accounts for this fact?
Answer:
The gas argon does not reach a state of vibrational excitation when infrared radiation strikes this gas.
Explanation:
The dry atmosphere is composed almost entirely of nitrogen (in a volumetric mixing ratio of 78.1%) and oxygen (20.9%), plus a series of oligogases such as argon (0.93%), helium and gases of greenhouse effect such as carbon dioxide (0.035%) and ozone. In addition, the atmosphere contains water vapor in very variable amounts (about 1%) and aerosols.
Greenhouse gases or greenhouse gases are the gaseous components of the atmosphere, both natural and anthropogenic, that absorb and emit radiation at certain wavelengths of the infrared radiation spectrum emitted by the Earth's surface, the atmosphere and clouds . In the Earth's atmosphere, the main greenhouse gases (GHG) are water vapor (H2O), carbon dioxide (CO2), nitrous oxide (N2O), methane (CH4) and ozone (O3 ). There is also in the atmosphere a series of greenhouse gases (GHG) created entirely by humans, such as halocarbons (compounds containing chlorine, bromine or fluorine and carbon, these compounds can act as potent greenhouse gases in the atmosphere and they are also one of the causes of the depletion of the ozone layer in the atmosphere) regulated by the Montreal Protocol. In addition to CO2, N2O and CH4, the Kyoto Protocol sets standards regarding sulfur hexafluoride (SF6), hydrofluorocarbons (HFCs) and perfluorocarbons (PFCs).
The difference between argon and greenhouse gases such as CO2 is that the individual atoms in the argon do not have free bonds and therefore do not vibrate. As a consequence, it does not reach a state of vibrational excitation when infrared radiation strikes this gas.
Argon doesn't contribute to global warming because it's chemically inert, meaning it doesn't react with other substances or absorb heat. This is unlike carbon dioxide, a greenhouse gas that absorbs and traps heat, leading to global warming.
Explanation:The explanation for why argon does not contribute to global warming, despite its relative abundance in the atmosphere, lies in its chemical nature. Unlike carbon dioxide (CO2), argon (Ar) is chemically inert, meaning it does not easily react with other elements or compounds. This property is due to its full set of electrons in its outermost shell, giving it a stable configuration.
Global warming is primarily caused by certain gases, notably CO2, that are capable of absorbing and trapping heat in the Earth's atmosphere, a phenomenon known as the greenhouse effect. When sunlight enters the Earth's atmosphere, some of it is reflected back into space, and some is absorbed by these greenhouse gases and re-emitted in all directions, warming the Earth's surface. However, argon does not participate in these interactions due to its chemical inertness. Even though it is 27 times more abundant than CO2, it does not absorb the Sun's heat and therefore does not contribute to global warming.
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A solution of CaCl₂CaCl₂ in water forms a mixture that is 31.0%31.0% calcium chloride by mass. If the total mass of the mixture is 650.5 g,650.5 g, what masses of CaCl₂CaCl₂ and water were used?
Answer:
There is used 201,655 grams CaCl2 and 448,845 grams of water (H2O)
Explanation:
w% = m(CaCl2) / m(total) x 100%
-> (m(Cacl2) = m(total) x w% ) / 100 %
-> m(CaCl2) = (650,5g x 31%) / 100% = 201,655g
Total mass : m(total) = m(CaCl2) + m(H2O)
-> m(H2O) = m(total) - m(CaCl2)
->m(H2O) = 650,5g - 201,655g = 448,845g
In 1911, Hans Geiger and Ernest Marsden (working under Ernest Rutherford) conducted an experiment involving alpha particles and gold foil that led to the discovery of the nucleus in atoms. The nucleus of an atom accounts for.:
A-most of the size and mass of the atom.
B-very little of the size and mass of the atom.
C-most of the atom's size but very little of its mass.
D-most of the atom's mass but very little of its size.
The nucleus of an atom, discovered by Hans Geiger and Ernest Marsden in 1911 during the Gold Foil Experiment, accounts for most of the atom's mass but very little of its size. Although it contains the majority of the atom's mass, the nucleus is much smaller in size compared to the full atom.
Explanation:In 1911, Hans Geiger and Ernest Marsden, under the supervision of Ernest Rutherford, conducted an experiment which is now commonly known as the Gold Foil Experiment. This experiment led to the pivotal discovery of the nucleus in atoms. In terms of size and mass, the nucleus of an atom accounts for most of the atom's mass but very little of its size (option D). The nucleus, although it contains nearly all of an atom's mass due to its protons and neutrons, is very small compared to the full size of the atom. The vast majority of the size of an atom is accounted for by the orbit of its electrons, which are extremely lightweight.
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Which of the following is not a chemical property of a substance?
- turns green when dissolved in water
- produces white flame when exposed to oxygen
- gives off brown fumes when treated with nitric acid
- conducts electricity
- reacts with chlorine
Answer:
First of all you need to know that chemical properties are those who are determined by chemical tests and are related to the reactivity of chemical substances. In those statements you have 4 reactions, except on "conducts electricity". That is a physical property.
Explanation:
A chemical reaction is a way in which the atoms of the elements regroup to form new substances.
Final answer:
Conducts electricity is a physical property and not a chemical property. Chemical properties are those that can only be observed when a substance undergoes a chemical change to become a different substance.
Explanation:
Among the options provided, the only feature that is not a chemical property is conducts electricity, as this is a physical property related to the substance's ability to allow the passage of electric current, which can be observed without changing the identity of the substance. Chemical properties, on the other hand, involve the substance's ability to undergo a chemical change. For example, reacting with oxygen to produce a white flame, turning green when dissolved in water, giving off brown fumes when treated with nitric acid, and reacting with chlorine are all indicative of chemical changes because they result in the formation of new substances with different compositions.
In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy (a measure of the force need to pull ions apart), which affects the enthalpy of solution. Based on ion sizes, rank these compounds by their expected heats of solution. Most exothermic to most endothermic. Substances are Kf Kl KBr KCl
Answer:
Most exothermic
Kl
KBr
KCl
KF
Most endothermic
Explanation:
There is the presence of the same cation in the given salts, so only anion has to be compared.
The charge density of the anion decreases from the fluoride to the iodide as size increases from fluoride to iodide. Fluoride has highest charge density because of the smallest radius in halogen family. Also, potassium fluoride would have highest lattice enthalpy because there will be greater force of attraction between them. The trend for the lattice enthalpy is:
KF>KCl>KBr>KI
Since more energy to split KF , so it will be most endothermic and so on.
So trend is:
KF is most endothermic and KI being most exothermic.
Most exothermic
Kl
KBr
KCl
KF
Most endothermic
The size of ions in an ionic compound impacts internuclear distance and lattice energy, which in turn affect the compound's enthalpy of solution. Larger ions have less lattice energy, and are less exothermic when dissolved. In a comparison of KF, KI, KBr, and KCl, KF should be most exothermic and KI, most endothermic.
Explanation:In an ionic compound, the size of the ion influences the distance between the nuclei of adjacent ions, known as the internuclear distance. This relation affects the lattice energy, or the energy required to separate the ions in an ionic compound. Larger ions have a greater distance between them and thus have less lattice energy and are less exothermic when dissolved.
Given the compounds KF, KI, KBr, and KCl, their ion sizes (from fluorine to iodine) decrease moving across the periodic table. Therefore, KF should be the most exothermic and KI should be the most endothermic. Consequently, the sequence from most exothermic to most endothermic should be KF > KCl > KBr > KI.
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If a covalent bond consists of a hydrogen atom and an oxygen atom, which atom will have a partial negative charge (-)? Which atom will have a partial positive charge (+)?
Answer: The Oxygen will have a partial negative charge, and the hydrogen will have a partial positive charge.
Explanation:
Electronegativity is the tendency of an atom to attract a pair of electrons when forming a chemical bond. The more electronegative atom will attract the electrons more, and will have a partial negative charge, because the electrons are negatively charged. The less electronegative atom will have the electrons the other atom attracted further away from it, so it will have a partial positive charge.
Oxygen is more electronegative than hydrogen. Oxygen has a nuclear charge of 16 protons (positively charged), whereas hydrogen only has 1. As a result, the pull these 16 protons produce on the electrons will be stronger than the pull only 1 proton produces, and the electrons will be closer to the Oxygen atom.
If 1.00L of muriatic acid w/ a pH of 2.5 is poured to 8.00L water, what is the new molar concentration of the muriatic solution? Hint: use C1•V1 = C2•V2
Answer:
The answer to your question is: C2 = 0.0004 M
Explanation:
Data
pH = 2.5; V = 1.0 L
V2 = 8.0 L C2 = ?
Formula
C1V1 = C2V2
C2 = C1V1 / V2
pH = -log[H⁺]
Process
[H⁺] = antilog -pH
[H⁺] = antilog (-2.5)
[H⁺] = 0.003 M = C1
Finally
(0.003)(1 l) = C2(8)
C2 = 0.003 / 8
C2 = 0.0004 M
Carbon dioxide: is removed from the atmosphere by photosynthesis. comprises up to two percent of the atmospheric gases. is being removed from the atmosphere faster than it is being inputted. is not present in significant amounts in the atmosphere of Venus.
Answer:
Is removed from the atmosphere by photosynthesis.
Explanation:
The carbon dioxide (CO2) is presented in the atmosphere and its cycle began with it's incoming by respiration, combustion of fuels and decomposition. The autotrophs, which realize photosynthesis, use CO2 as fuel to produce their food with Sun rays.
The CO2 comprises about 0.3% of the atmospheric gases, and in the past few years, its input is being higher than its removal of the atmosphere, which is aggravating the greenhouse effect. Besides, the atmosphere of Venus has higher levels of CO2.
Which of the statements describes a chemical property?
a) Iodine (a purple solid) becomes a purple gas.
b) Titanium is less dense than iron.
c) Sugar burns in air to form water and carbon dioxide.
d) Water boils at 100 ∘C.
Answer:
The answer to your question is letter c) Sugar burns in air to form water and carbon dioxide.
Explanation:
Exist two kinds of phenomena: physical and chemical
physical phenomena are when matter only changes its physical state, like evaporation, condensation, sublimation, etc.
chemical phenomena are when matter changes, react and form a new compound.
a) Iodine (a purple solid) becomes a purple gas. This is a physical change, sublimation, this answer is wrong.
b) Titanium is less dense than iron. Density is a physical property of matter, this answer is incorrect.
c) Sugar burns in air to form water and carbon dioxide. Sugar in transform into water and carbon dioxide, this is the right answer.
d) Water boils at 100 ∘C. Evaporation is a physical change, the answer is wrong.
The statement describing the chemical property has been the burning of sugar in air to form carbon dioxide and water. Thus, option C is correct.
The property of the element has been given as the physical and chemical property.
The physical property has been defined as the one in which the chemical composition has not been changed. It has been based on the appearance of the compound.
The chemical property has been the reactivity of the compound that results in the change in the chemical composition with the formation of new products.
Chemical propertyThe following changes have been classified as:
Iodine becomes purple:It has been the appearance and no change in the chemical composition. Thus, it is a physical property.
Titanium, less dense than iron:It has been based on the comparative density. There has been no reaction and change in chemical composition. Thus, it is a physical property.
Sugar burns in airThe burning of sugar results in the change in the chemical composition with the formation of new product. Thus, it has been a chemical property.
Boiling of waterThe boiling and freezing results in the change in state of matter. There has been no change in the chemical composition, Thus, it has been a physical change.
Hence, the statement describing the chemical property has been the burning of sugar in air to form carbon dioxide and water. Thus, option C is correct.
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What is the name of the functional group that is attached to this hydrocarbon backbone?
ether
alcohol
alkyl halide
carbonyl group
Answer:
The answer to your question is: Alkyl halide
Explanation:
Ether: is a functional group in which an oxygen is attached to two alkyl or aryl groups.
R --- O --- R'
Alcohol: is a functional group which has one or more hydroxyl group in its structure.
R ---- OH
Alkyl halide: is a group in which one or two hydrogens are replaced by halogens.
R --- X X = halogen
Carbonyl group: is a structure in which one carbon is double-bounded to one oxygen
R --- C = O
|
R'
Answer:
Alkyl halide is the right answer
Refer to the following elements to answer the questions below. 126C168O11H147N3216S3115P, where the upper index is atomic mass and the lower index is atomic number. How many electrons will a single atom of sulfur with no charge and no bonds have in its valence shell?
Answer: The number of valence electrons in sulfur atom are 6.
Explanation:
The isotopic representation of sulfur atom is [tex]_{16}^{32}\textrm{S}[/tex]
Valence electrons are defined as the electrons that are present in the outer most orbital of an atom. Electrons present in the orbitals having highest principle quantum number are termed as valence electrons.
Sulfur is the 16th element of the periodic table having 16 electrons.
Electronic configuration of sulfur atom is [tex]1s^22s^22p^63s^23p^4[/tex]
The number of valence electrons present in sulfur atom are 2 + 4 = 6
Hence, the number of valence electrons in sulfur atom are 6.
Gaseous hydrogen iodide is placed in a closed container at 425°C, where it partially decomposes to hydrogen and iodine: 2HI(g)⇌H₂(g)+I₂(g) At equilibrium it is found that [HI]= 3.51×10⁻³ M, [H₂]= 4.76×10⁻⁴ M, and [I₂]= 4.76×10⁻⁴ M.
What is the value of [tex]K_c[/tex] at this temperature? Express the equilibrium constant to three significant digits.
Answer : The value of [tex]K_c[/tex] at this temperature is 0.0184
Explanation : Given,
Concentration of [tex]HI[/tex] at equilibrium = [tex]3.51\times 10^{-3}M[/tex]
Concentration of [tex]H_2[/tex] at equilibrium = [tex]4.76\times 10^{-4}M[/tex]
Concentration of [tex]I_2[/tex] at equilibrium = [tex]4.76\times 10^{-4}M[/tex]
The given equilibrium reaction is,
[tex]2HI(g)\rightleftharpoons H_2(g)+I_2(g)[/tex]
The expression of [tex]Kc[/tex] will be,
[tex]K_c=\frac{[H_2][I_2]}{[HI]^2}[/tex]
Now put all the given values in this expression, we get:
[tex]K_c=\frac{(4.76\times 10^{-4})\times (4.76\times 10^{-4})}{(3.51\times 10^{-3})^2}[/tex]
[tex]K_c=0.0184[/tex]
Therefore, the value of [tex]K_c[/tex] at this temperature is 0.0184
Final answer:
The equilibrium constant, Kc, for the decomposition of gaseous hydrogen iodide into hydrogen and iodine at 425°C, given the concentrations at equilibrium, is calculated as 1.84×10⁻².
Explanation:
The question asks about the calculation of the equilibrium constant, Kc, for the decomposition of hydrogen iodide into hydrogen and iodine at 425°C. The provided concentrations at equilibrium are [HI] = 3.51×10⁻³ M, [H₂]= 4.76×10⁻⁴ M, and [I₂]= 4.76×10⁻⁴ M.
To find Kc, we use the expression Kc = [H₂][I₂]/[HI]². Plugging in the given values:
Kc = (4.76×10⁻⁴ M)×(4.76×10⁻⁴ M) / (3.51×10⁻³ M)²
Kc = (2.26×10⁻⁷ M²) / (1.23×10⁻⁵ M²)
Kc = 1.84×10⁻²
To express Kc to three significant digits, Kc = 1.84×10⁻².
When M2S3(s) is heated in air, it is converted to MO2(s). A 3.280 g sample of M2S3(s) shows a decrease in mass of 0.228 g when it is heated in air. What is the average atomic mass of M?
Answer:
The average atomic mass of M is 181.33 g/mol.
Explanation:
First off we need to know the reaction that takes place. The balanced reaction of M₂S₃(s) is:
M₂S₃(s) + O₂(g) ⇒2MO₂(s) + 3SO₂(g)The important section for this problem is this:
M₂S₃(s) ⇒2MO₂(s)**Thus, the number of moles of M in M₂S₃ is equal to the number of moles of M in 2MO₂.
The decrease in mass means that M₂S₃ reacted and produced MO₂, thus the mass of MO₂ is 3.280-0.228=3.052 g
Now let's say x is the atomic weight of M, and write the molecular weights (Mw) of those two compounds:
Mw of M₂S₃= 2x + 96 g/mol
Mw of MO₂= x + 32 g/mol
Now we determine the moles of each compound, using the formula [ moles = mass / molecular weight ]:
Moles of M₂S₃= [tex]\frac{3.280g}{2x+96g/mol}[/tex]
Moles of MO₂= [tex]\frac{3.052g}{x+32g/mol}[/tex]
Using the equivalence marked by asterisks, we're left with (note that the second denominator is multiplied by 2 because of the reaction coefficients):
[tex]\frac{3.280g}{2x+96g/mol}=\frac{3.052g}{2x+64g/mol}[/tex]
We solve for x:
[tex]\frac{3.280g}{3.052g}=\frac{2x+96g/mol}{2x+64g/mol[tex]1.075*(2x+64g/mol)=2x+96g/mol\\2.150x+68.8g/mol=2x+96g/mol\\0.150x=27.2g/mol\\x=181.33g/mol[/tex]}[/tex]
Thus, the average atomic mass of M is 181.33 g/mol.
The average atomic mass of M was calculated from the mass loss during the conversion of M2S3 to MO2. It was found by comparing the moles of sulfur lost to the moles of M present and then calculating the mass per mole of M, yielding a value of 642.53 g/mol.
Explanation:To determine the average atomic mass of M from the conversion of M2S3 to MO2, we begin by understanding that the loss of mass is due to the conversion of sulfur (S) in M2S3 to sulfur dioxide (SO2) in air. Given that the mass decrease is 0.228 g, this corresponds to the mass of sulfur that was converted to SO2.
Since the molar mass of sulfur is 32 g/mol, we can find the moles of sulfur that were lost:
0.228 g / 32 g/mol = 0.007125 mol of sulfur lost. Because the compound is M2S3, the loss of three moles of sulfur corresponds to two moles of M being present. Using the moles of sulfur lost, we can set up a proportion to find the moles of M:
3 moles of S : 2 moles of M
0.007125 moles of S : X moles of M
This gives us X = (2/3) * 0.007125 moles of M = 0.00475 moles of M.
The original mass of M2S3 was 3.280 g. After heating and the loss of sulfur, the remaining mass corresponds to M in the compound MO2. Therefore, we subtract the mass of sulfur lost from the original mass to find the mass of M:
Mass of M = 3.280 g - 0.228 g = 3.052 g
Finally, we can calculate the average atomic mass of M:
Average atomic mass of M = 3.052 g / 0.00475 mol = 642.53 g/mol (rounded to two decimal points)
Anna is 100 lb and will be infused with 125 mg dobutamine in 500 ml NS at 10 mcg/kg/min. How many milligrams of dobutamine will she receives/ hour? Your answer is in mg/h.
Answer:
27.216 mg/h.
Explanation:
First you need to convert 100 lb to kg, and there are 45.36 kg, she will receive 10 mcg/kg/min so if you multiply it by 45.36 kg, she will receive 453.6 mcg/min, so in one hour (60 minutes) she will receive 27216 mcg/h, 1000 mcg are 1 mg, so she will receive 27.216 mg/h.
The task in science lab: discover which solid substance, without tasting, is sugar. Donna and Dave have five substances to test, and unfortunately, two are white! "Let's heat them!" suggested Donna.
Answer:
The answer to your question is: sugar melting point: 186°C
Explanation:
I think that Donna did an excellent suggestion. If we heat a substance till it melts, we are obtaining the melting point. This point is the temperature at which a solid changes from solid to liquid and is specific for every substance. That means that the melting point of sugar is different from the melting point of salt, etc. So, they could distinguish among the substance they have the one that is sugar.
For example: sugar table salt
Melting point 186°C 801°C
Given their location on the periodic table, identify the ionic charge for each element and predict the compound formed by the barium and chloride ions.
Explanation:
Atomic number of barium is 56 and its electronic configuration is [tex][Xe]6s^{2}[/tex].
Since, barium is a group 2 metal so in order to attain stability it will readily lose two electrons. Hence, barium will acquire a +2 charge and forms [tex]Ba^{2+}[/tex] ion.
On the other hand, chlorine is a group 17 element and its electronic distribution is 2, 8, 7. Hence, to attain stability it will gain one electron and forms [tex]Cl^{-}[/tex] ion.
Thus, we can conclude that charge on barium ion is +2 and charge on chlorine ion is -1.
Barium (Ba) is a second gathering component in s - the block of the occasional table. Every element in the second group always displays 2+ charge as cations. As a result, the Ba cation in BaCl2 has a 2+ charge as well. Chlorine and barium make up the inorganic salt barium chloride.
They c form an ionic bond since barium (Ba) is a metal and chlorine (Cl) is a nonmetal. An essential electrolyte found in all body fluids, chloride ion is a chlorine anion that is responsible for maintaining acid-base balance, transmitting nerve impulses, and regulating fluid in and out of cells.
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a). Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. They can be stopped by, for example, a sheet of paper or a few inches of air. That is one reason that authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po change into after it emits an alpha particle?
b). Some undiluted acids aremore corrosive when they are diluted with water. That is why laboratory workers are told to wipe acid splashes with a towel before washing with a copious amounts of water. Explain.
Answer:
a) Lead
b) Below
Explanation:
a) ₂₁₀ Po⁸⁴ ⇒ α + ₂₀₈Pb⁸²
b) Acids are extremely corrosive substances, so they must be cleaned soon as possible because they can damage not only the furniture but also clothes and skin of the laboratory workers.
Before cleaning the polluted area with water, acids must be clean with towels in order to reduce the amount of acid.
The reaction between the acids and water are very explosive, they are exothermic reactions, that means that they increase the temperature of the area polluted and it can cause more damage. That's why the area must be cleaned with towel before add water.
A peptide bond Question
A. is a covalent bond between the functional R groups of adjacent amino acids.
B. is a covalent bond between the NH group of one polypeptide and the CO group of an adjacent polypeptide that holds together multimeric proteins.
C. is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid.
D. is a covalent bond between adjacent glucose molecules in a peptide. a noncovalent bond that dictates the tertiary structure of a protein.
Answer:
C. is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid.
A peptide bond is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid. Therefore, the correct option is option C.
What is peptide bond?A peptide bond, also known as a eupeptide bond, is a chemical connection produced by attaching one amino acid's carboxyl group towards the substituent of the other.
A peptide bond is a form of covalent chemical link that is amide in nature. A peptide bond is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid.
Therefore, a peptide bond is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid. The correct option is option C among all the given options.
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