A beaker was half filled with freshly distilled H2O and placed on a hot plate. As the temperature of the water reached 100°C, vigorous bubbling was observed in the beaker. The gaseous contents of the bubbles were analyzed. The presence of which of the following substances would support the claim that the observed phenomenon was a physical change?
1-H2(g)
2-O2(g)
3-CO2(g)
4-H2O(g)
Answer:
If anything but H2O were found, it would be evidence of a chemical change. Therefore, 4 is the only viable evidence that it was a physical change of H2O liquid to H2O gas.
Answer:
4-[tex]H_{2}O_{(g)}[/tex]
Explanation:
Initially, the beaker contains distilled water which is liquid water at room temperature. When the beaker was placed on a hot plate and heat energy was applied the temperature of the system increases gradually until the boiling point was reached. Water generally boils at 100°C and at this temperature, liquid water changes to vapor or gas. In addition, liquid water and steam or water vapor are in equilibrium. Therefore, the presence of water vapor ([tex]H_{2}O_{(g)}[/tex]) indicates that the process is a physical change.
During a light storm, what can cause the ground to become positively charged?
Answer:
The charge in the clouds can cause the ground to become positively charged.
Explanation:
During a thunderstorm, the important charging area is the central part or portion of the storm when air is moving in an upward direction. The temperature here ranges from -15 to -25 degree Celsius. The ground has a slightly negative charge and when a thunderstorm comes the negative charge on the ground is repelled by the negative charge in the center of the storm. This makes the ground that is underneath the storm to become more positively charged.
5. RELATING IDEAS Carbon and oxygen react to form
carbon monoxide: 2C+02-→ 2CO. What mass-
es of carbon and oxygen are needed to make
56.0 g CO? Which law does this illustrate?
5. It is one of the most important greenhouse gases linked to global warming, but it is a minor component of Earth’s atmosphere (about 3 volumes in 10,000), formed in combustion of carbon-containing materials, in fermentation, and in respiration of animals and employed by plants in the photosynthesis of carbohydrates.
(ᵔᴥᵔ)Hope It Helpsʕ·ᴥ·ʔThe mass of oxygen and carbon required to produce 56 grams CO has been 32 grams and 24 grams respectively. The law that illustrates this has been the law of conservation.
The moles of product or reactant in a chemical reaction are given by the stoichiometric coefficient of the balanced chemical equation.
The given balanced equation has been:
[tex]\rm 2\;C\;+\;O_2\;\rightarrow\;2\;CO[/tex]
From the balanced chemical equation, for the formation of 2 moles of CO,1 mole of oxygen and 2 moles of carbon has been required.
56 g of CO has been equivalent as:
[tex]\rm Moles=\dfrac{Mass}{Molar\;mass} \\\\Moles\;CO=\dfrac{56}{28}\;mol\\\\ Moles\;CO=2\;moles[/tex]
The moles of CO produced has been 2 moles. Thus, the moles of oxygen and carbon required are:
The mass of oxygen required is 32 grams.
Carbon required is 2 moles.The mass of carbon required has been 24 grams.
The law that illustrates this is the law of conservation. According to the law of conservation, mass has not been lost in the chemical reaction.
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Identify the type of atom that generally forms covalent bonds.
Answer:
non-metal
Explanation:
Covalent bonds are formed when non-metal atoms are combined.
In the periodic table, that's groups 3A, 4A, 5A, 6A and 7A, all to the right of the "staircase" line.
How many significant figures are in the measurement 0.023040 cm?
There are five significant figures in the measurement 0.023040 cm.
To determine the number of significant figures in a given measurement, one must follow these rules:
1. Non-zero digits are always significant. In the measurement 0.023040 cm, the digits 2, 3, and 4 are non-zero and thus significant.
2. Zeros between non-zero digits are significant. Here, the zero between the 3 and the 4 is significant because it is sandwiched between two non-zero digits.
3. Leading zeros, which are zeros before the first non-zero digit in a number less than one, are not significant. In this case, the two zeros after the decimal point and before the 2 are leading zeros and are not significant.
4. Trailing zeros, which are zeros at the end of a number, are significant if the number has a decimal point. In the measurement 0.023040 cm, the zero at the end is after the decimal point and is therefore significant.
Applying these rules, we count the significant figures in 0.023040 cm as follows:
- The first two zeros after the decimal point are not significant (leading zeros).
- The digit 2 is significant.
- The digit 3 is significant.
- The zero between the 3 and the 4 is significant (it is between two non-zero digits).
- The digit 4 is significant.
- The last zero is significant (trailing zero after the decimal point).
Therefore, the measurement 0.023040 cm has five significant figures.
Photons are not considered as objects in the traditional sense, as they cannot exist in a
stationary state.
a. True
b. False
Answer: True
Explanation:
Photons do not have mass, so they are not considered matter. However, they do have a stationary state either, so they are not considered an object in Physics.
When a liquid becomes a gas, the process is called_______.
a. condensation
b. diffusion
c. evaporation
The correct answer is C: Evaporation.
Further Explanation:
Liquids that become a gas goes through a process called evaporation. Evaporation occurs when something that is liquid heats up enough to become a gas form. The liquid is heated so quickly that the molecules in the liquid evaporate.
Condensation is the opposite of evaporation and this turns the gas into a liquid.
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1.) Describe two ways that an ion forms from an atom. (Hint: loss of electrons= cation, gain of electrons=anion)
2.)Describe the difference between an ionic and a covalent bond.
Atoms form ions by gaining or losing electrons. A cation forms when an atom loses electrons, while an anion forms when an atom gains electrons. An ionic bond is formed between oppositely charged ions, while a covalent bond is formed by the sharing of electrons between atoms.
Explanation:Ions are formed when atoms gain or lose electrons. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. An example of a cation is sodium (Na+), which loses one electron to form a positive ion. An example of an anion is chloride (Cl-), which gains one electron to form a negative ion.
Difference between ionic and covalent bonds:
An ionic bond is formed by the attraction between a positive ion (cation) and a negative ion (anion). These ions are held together due to the opposite charges, similar to how oppositely charged magnets stick together. A covalent bond is formed when electrons are shared between two atoms. Each atom shares one of their electrons, which then orbits the nuclei of both atoms. Covalent bonds are typically formed between nonmetal atoms.
Which of the following could be considered a benefit of modern farming
techniques?
O
A. Food is produced more slowly than it used to be.
O
B. More land is available for the construction of industrial buildings
and neighborhoods.
O
C. The food we eat is fresher because it is treated with preservatives.
O
D. Pesticides have improved the environment.
Answer:
C. The food we eat is fresher because it is treated with preservatives
Answer:
Option-(B,C): Due, to having more advanced or modern farming techniques there is more land available for the construction of industrial buildings and neighborhoods. While, the food we eat is fresher because it is treated with preservatives.
Explanation:
The modern farming techniques has provided with great benefits, as there is more space for building new structures and develop the industrial zones more frequently. As, there is now much space to have industries in the region,while the farms are much advanced these days. Along with that, the food is able to eaten after longer duration of time and is able to be supplied to much far distances across the borders to other countries or regions. Just because the food we eat is fresher because it is treated with preservatives.As, there are some modern techniques which has able us to preserve the food through any long season.
why is the venus flytrap different from most other green plants
Answer:
The Venus flytrap consumes its food in the form of flies and other small insects not through the roots as other plants
Explanation:
Answer:
The thing about the venus fly trap which makes it so unique and are known for is its ability to digest insects.
Explanation:
The thing about the venus fly trap which makes it so unique and are known for is its ability to digest insects. In its name "fly trap" which are commonly house plants implies the ability of trapping insects for its nutrional value
Which of the following occurs during a redox reaction?
A. Only electrons are obtained
B. Only electrons are lost
C. Electrons are won and lost
D. Electrons are not earned or lost
Answer:
C = Electrons are won and lost.
Explanation:
The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining and losing the electrons and oxidation state of elements are changed.
Oxidation:
Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.
Reduction:
Reduction involve the gain of electron and oxidation number is decreased.
Consider the following reactions.
4KI + 2CuCl₂ → 2CuI + I₂ + 4KCl
the oxidation state of copper is changed from +2 to +1 so copper get reduced.
CO + H₂O → CO₂ + H₂
the oxidation state of carbon is +2 on reactant side and on product side it becomes +4 so carbon get oxidized.
Na₂CO₃ + H₃PO₄ → Na₂HPO₄ + CO₂ + H₂O
The oxidation state of carbon on reactant side is +4. while on product side is also +4 so it neither oxidized nor reduced.
H₂S + 2NaOH → Na₂S + 2H₂O
The oxidation sate of sulfur is -2 on reactant side and in product side it is also -2 so it neither oxidized nor reduced.
Oxidizing agents:
Oxidizing agents oxidize the other elements and itself gets reduced.
Reducing agents:
Reducing agents reduced the other element are it self gets oxidized.
Name the only satellite which is known to have an atmosphere in the planet it orbits
Answer:
Titan which orbits Saturn
Explanation:
Saturn's Titan is the only moon known to have a significant atmosphere, composed mainly of nitrogen with organic particles and methane lakes on its surface.
Explanation:The only satellite known to have an atmosphere in the planet it orbits is Titan, the largest moon of Saturn. Titan has a substantial atmosphere composed mainly of nitrogen. It is the only moon in the outer solar system with a significant atmosphere, and its atmosphere is even denser than Earth's. The atmosphere of Titan is of great interest to scientists because it contains organic particles and may provide clues to the early stages of life formation on Earth.
The only known satellite in the solar system with a substantial atmosphere is Saturn's Titan. Titan is unique among moons in that it possesses a dense atmosphere filled with organic particles. This atmosphere is primarily composed of nitrogen, similar to Earth's, but with temperatures too low to allow for carbon dioxide or water vapor, resulting in nitrogen being the dominant gas. The atmosphere on Titan is of great interest to scientists because it may provide clues to the early stages of how life formed on Earth. The Cassini spacecraft and the Huygens probe provided valuable data on Titan's composition, including the discovery of methane lakes on its surface.
How much would the boiling point of water increase if 4 mol of NaCl were
added to 1 kg of water (Kb = 0.51°C/(mol/kg) for water and i = 2 for NaCl)?
Answer:
4.08
Explanation:
Answer:
4.08
Explanation:
a . p . e . x .
Part A
What volume of 0.210 M K S solution is required to completely react with 175 mL of 0.140 M CO(NO3),?
117 mL of 0.210 M K₂S solution
Explanation:
The question asks about the volume of 0.210 M K₂S (potassium sulfide) solution required to completely react with 175 mL of 0.140 M Co(NO₃)₂ (cobalt(II) nitrate).
We have the chemical reaction:
K₂S + Co(NO₃)₂ → CoS + 2 KNO₃
molar concentration = number of moles / volume (L)
number of moles = molar concentration × volume
number of moles of Co(NO₃)₂ = 0.140 × 175 = 24.5 mmoles
We see from the chemical reaction that 1 mmole of Co(NO₃)₂ is reacting with 1 mmole of K₂S, so 24.5 mmoles of Co(NO₃)₂ are reacting with 24.5 mmoles of K₂S.
volume = number of moles / molar concentration
volume of K₂S solution = 24.5 / 0.210 = 117 mL
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The amount of space that something occupies or contains is__________.
a. volume
b. density
c. state
Answer:
a
Explanation:
Volume
Need help converting 4.82 mmol of diphenylmethanol to grams (C13H12O)?
To convert 4.82 mmol of diphenylmethanol to grams, calculate the molar mass of C13H12O to be 184.32 g/mol. Then, multiply 4.82 mmol by the molar mass and divide by 1000 mmol/mol to get 0.8886 grams.
Explanation:To convert 4.82 mmol of diphenylmethanol (C13H12O) to grams, you first need to calculate the molar mass of diphenylmethanol. The molar mass is calculated by the sum of the atomic weights of each atom in the molecular formula. The molecular weights are approximately: Carbon (C) = 12.01 g/mol, Hydrogen (H) = 1.008 g/mol, and Oxygen (O) = 16.00 g/mol. Thus, the molar mass of C13H12O is (13x12.01 g/mol) + (12x1.008 g/mol) + (16.00 g/mol) = 184.32 g/mol.
Next, use the conversion factor that relates millimoles to grams using the molar mass:
4.82 mmol C13H12O x (184.32 g/mol) / (1000 mmol/mol) = 0.8886 g C13H12O
So, 4.82 mmol of diphenylmethanol is equivalent to 0.8886 grams.
write the equation for the combined gas law using temperature in degree Celsius. explain why the Kelvin scale is convenient
Answer:
[tex]\frac{PV}{T}=k[/tex]
Explanation:
Combine Gas law is a combination of three gas laws which are Boyle's Law, Charles' Law, and Gay-Lussac's Law.
Combine gas law states that the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant.
Hence the equation becomes:
[tex]\frac{PV}{T}=k[/tex]
where P = pressure,
V = volume,
T = absolute temperature,
k = constant.
Now we know that Kelvin = °Celsius + 273
For all gas law problems it is necessary to work in the Kelvin scale because temperature is in the denominator in the combined gas laws (P/T, V/T and PV/T) and can be derived in the ideal gas law to the denominator (PV/RT) . If we measured temperature in Celsius we could have a value of zero degrees Celsius and this would solve as no solution, as you cannot have zero in the denominator.
However, if we reached zero in the Kelvin scale this would be absolute zero and all matter would stop and therefore there would be no gas laws to worry about.
What is the mass of 6.02 x 10^23 molecules of nitrogen gas, N2?
Answer:
1.69×10^25 grams
Explanation:
First convert molecules to moles and then convert moles to grams by multiplying by the molar mass which is 28.0g and you get this answer!!
Hope this is right
Explain how H20 chemical formula describe a model of a water molecule?
Its molecule contains one oxygen and two hydrogen atoms.
Explanation:
Water is a chemical substance with the chemical formula H2O. Water is a chemical substance with the chemical formula H2O. Its molecule contains one oxygen and two hydrogen atoms connected by covalent bonds.
Hope this helps ; )
Look at the diagram to below. In which direction would the object move?
to the left
to the right
straight up
Answer:
The object will move to the right .
Explanation:
The force in the right side of the object is 20N which is more than the force of any other side according to the given question.
As the force in the right side of the object is greater than that of other sides the the object will move to the right.
Borus Mendeleev is credited as being the primary creator of the first version of the
periodic table of elements.
a. True
b. False
Final answer:
Dmitri Mendeleev is credited with creating the first recognized periodic table of elements in 1869, which included predictions for undiscovered elements, making it a groundbreaking contribution to chemistry.
Explanation:
The answer to the student's question is a. True. Dmitri Mendeleev is widely credited with creating the first periodic table of the elements in 1869. This early version of the periodic table organized elements by increasing atomic mass and showcased periodic trends. Mendeleev also boldly left gaps in his table for undiscovered elements, predictively detailing their possible properties, many of which were later confirmed with the discovery of elements like gallium and germanium. While German chemist Lothar Meyer also published a similar table around the same time, Mendeleev's periodic table is generally recognized as more significant due to its predictive nature and earlier publication.
If 3.0 g of NH3 reacts with 5.0 g of HCl, what is the limiting reactant?
Explanation:
[tex]\text{number of moles}=\frac{\text{given mass}}{\text{molar mass}}[/tex]
For [tex]NH_{3},[/tex]
[tex]\text{given mass}=3g[/tex]
[tex]\text{molar mass}=14+3=17g[/tex]
[tex]n_{NH_{3}}=\frac{3}{17}=0.176[/tex]
For [tex]HCl,[/tex]
[tex]\text{given mass}=5g[/tex]
[tex]\text{molar mass}=1+35.5=36.5g[/tex]
[tex]n_{HCl}=\frac{5}{36.5}=0.136[/tex]
The reaction between [tex]NH_{3}[/tex] and [tex]HCl[/tex] is
[tex]NH_{3}+HCl[/tex]→[tex]NH_{4}Cl[/tex]
So,one mole of [tex]NH_{3}[/tex] requires one mole of [tex]HCl[/tex]
[tex]0.176[/tex] moles of [tex]NH_{3}[/tex] requires [tex]0.176[/tex] moles of [tex]HCl[/tex]
But there are only [tex]0.136[/tex] moles of [tex]HCl[/tex] available.
[tex]HCl[/tex] will be consumed first.
So,[tex]HCl[/tex] is the limiting reagent.
Which substance is a mixture?
table salt
gasoline
aluminum
carbon dioxide
Answer: gasoline
Explanation: Gasoline is a mixture of many different hydrocarbons: alkanes (paraffins), cycloalkanes and alkenes (olefins). Salt and carbon dioxide are chemical compounds, aluminium (Al) is an chemical element.
Taking into account the definition of mixture, the correct answer is second option: gasoline.
A mixture is the combination or union of two or more elements or components that can be found in any state of matter.
Mixtures can be homogeneous, where the components are united in a uniform way and are not distinguished by the naked eye, or heterogeneous, which lacks uniformity, so that the substances or elements that make up the mixture can be distinguished.
Gasoline is a combination of several liquid, volatile and flammable hydrocarbons, that is, organic compounds formed only by carbon and hydrogen, obtained by fractional distillation of petroleum to which additives are added to improve its properties.
In others words, gasoline is a homogeneous mixture of hydrocarbons which are obtained from oil.
In summary, the correct answer is second option: gasoline.
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31) The mass of an electron is approximately 1/1836
times the mass of
A) 1/1H
B) 2/1H
c) 3/1H
D) 4/2He
Answer:
[tex](_{1} ^ {1}\textrm{H})[/tex] is the correct choice that is option A.
Explanation:
An electron has [tex]\frac{1}{1836}[/tex] times the mass of a proton, but an equal and opposite negative charge.
Lets [tex]_{A}^{Z}\textrm{X}[/tex] is any element represented here.
Where [tex]Z[/tex] is the number of protons as well as its atomic number.
And
[tex]A[/tex] is the mass number which is the number of protons and neutrons in any atom.
Note: We know that Hydrogen [tex](_{1} ^ {1}\textrm{H})[/tex] is devoid of neutron,so number of neutrons in a Hydrogen atom is zero.
Then
[tex](_{1} ^ {1}\textrm{H})[/tex] is also a representation of single proton.
So [tex](_{1} ^ {1}\textrm{H})[/tex] is the right choice that is option A.
The mass of an electron is approximately 1/1836 times the mass of a proton.
Explanation:The mass of an electron is approximately 1/1836 times the mass of a proton (choice B). This means that the mass of the electron is much smaller compared to the mass of the proton. For example, in a hydrogen atom, which consists of just one proton and one electron, the mass of the proton is about 1836 times greater than the mass of the electron.
CH3CO3H + Fe = CH3COOH + FeO represents a(n)_____ equation.
A.) Balanced
B.) Unbalanced
Answer:
Balanced
Explanation:
2 Carbons per side
4 Hydrogens per side
3 Oxygen per side
1 Iron per side
Answer:
Balanced
Explanation:
For an equation to be balanced, the number of atoms of each element on the lefthand side and right hand side of the reaction equation must be exactly the same.
There are four hydrogen atoms on each side
There is one carbon atom on each side
There are three oxygen atoms on each side
There is one iron atom on each side.
This is how to know a balanced chemical reaction equation.
Take a look at the guidewords listed below. If you wanted to look up the word curiosity, from “Rikki-Tikki-Tavi,” in a dictionary, on which page would you search coupon – cousin cow – coyote cure – current curricular – cushion
Answer:
the answer is current curricular
Answer:
current curricular
Explanation:
What are the products???
Potassium Chloride + Sodium ->
Potassium Chloride and sodium chloride is a combination ofmineral supplement that may be helpful in heart prostration
PLEASE HELP ASAP
Half equation for zinc atoms changing into zinc ions
Answer:
[tex]Zn^{0} --->Zn^{2+} +2e^{-}[/tex]
Explanation:
[tex]Zn^{0} --->Zn^{2+} +2e^{-}[/tex]
genetically-identical individuals
Answer:
twins
Explanation:
twins are genetically identical
What is the temperature range in the Mesosphere?
°C to C
Answer:
The temperature range in the Mesosphere 15 degrees Celsius (5 degrees Fahrenheit) to negative 120 degrees Celsius (negative 184 degrees Fahrenheit)
Explanation:
The mesosphere lies above the stratosphere and extends over the Earth's surface to 85 kilometers (53 miles). The temperature at the mesosphere limit drops from negative 15 degrees Celsius (5 degrees Fahrenheit) to negative 120 degrees Celsius (negative 184 degrees Fahrenheit) at the base of the thermosphere.
Meteors vaporize in mesosphere, giving metallic ions a higher concentration than other layers of atmosphere.
Final answer:
The temperature in the mesosphere ranges from about 0°C at its lower boundary to as low as -100°C at the mesopause, its upper boundary. The mesosphere's low temperatures are due to its very thin air and lack of water vapor and ozone to absorb heat from the sun.
Explanation:
The temperature range in the mesosphere varies significantly with altitude. At the lower boundary, directly above the stratosphere (starting around 50 km above Earth's surface), temperatures can be around 0°C. As altitude increases within the mesosphere, temperatures drop sharply, reaching the mesosphere's lowest temperatures at the mesopause, which lies at the top of the mesosphere, around 85 km above the surface. Here, temperatures can plunge to as low as -100°C (-148°F).
The mesosphere is warmed from the bottom by the stratosphere below. The air in the mesosphere is very thin, and its density is approximately 1/1000th of that at the surface, which makes this atmospheric layer quite cold. This temperature decrease with altitude is due to the minimal amounts of water vapor and ozone that would otherwise help to absorb the sun's rays and heat the air.