Answer:
The molarity of acid is 3 M.
Explanation:
Given data:
Volume of H₃PO₄ = 25 mL
Volume of NaOH = 50 mL
Molarity of NaOH = 1.50 M
Molarity of H₃PO₄ = ?
Solution:
Formula:
M₁V₁ = M₂V₂
M₁ = M₂V₂ / V₁
M₁ = 1.50 M ×50 mL / 25 mL
M₁ = 75 M. mL / 25 mL
M₁ = 3 M
The molarity of acid is 3 M.
To determine the molarity of the acid, we can use the mole ratio between H3PO4 and NaOH in the neutralization reaction. By calculating the moles of NaOH used and using the mole ratio, we can find the moles of H3PO4. Finally, dividing the moles of H3PO4 by the volume of the sample gives us the molarity of the acid, which is 9.00 M.
Explanation:In order to determine the molarity of the acid, we will use the equation:
H3PO4(aq) + 3NaOH(aq) → Na3PO4(aq) + 3H2O(l)
From the equation, we can see that the mole ratio between H3PO4 and NaOH is 1:3. Since 50.0 mL of 1.50 M NaOH was required to neutralize the 25.0 mL sample of H3PO4, we can calculate the moles of NaOH used:
Moles of NaOH = 1.50 M x 0.0500 L = 0.0750 mol
Since the mole ratio between H3PO4 and NaOH is 1:3, we can calculate the moles of H3PO4:
Moles of H3PO4 = 3 x 0.0750 mol = 0.225 mol
Finally, we can calculate the molarity of the acid by dividing the moles of H3PO4 by the volume of the sample:
Molarity = Moles/Volume = 0.225 mol/0.0250 L = 9.00 M
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Which of Dalton's five principles still hold true?
Dalton's principles that atoms are the smallest units, identical atoms form an element, and atoms can combine to form compounds remain valid. The principles that atoms have specific weights and can't be divided, created, or destroyed have been updated.
Explanation:Most of Dalton's five principles from his atomic theory still hold true in general. However, some have been tweaked or expanded with new understanding. The principles that still remain valid include: atoms are the smallest units that matter can be broken into (although we now know about subatomic particles); all atoms of a specific element are identical; and atoms of different elements can combine in specific ratios to form compounds. atomic weights of elements may differ, and atoms cannot be divided, created or destroyed have been updated with modern atomic theory which includes the existence of isotopes, nuclear reactions that can transmutate elements and subatomic particles that makeup atoms respectively.
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Dalton's atomic theory, with its revolutionary principles, still largely holds true today in the realm of chemistry. His claims about the conservation of matter during chemical change and that elements cannot be broken into simpler substances are valid. However, his ideas about isotopes had to be revised to account for their variations in mass.
Explanation:John Dalton, an English schoolteacher, revolutionized chemistry with his atomic theory, changing the way we understand the composition of matter. Despite two thousand years of the Aristotelian view dominating, Dalton drastically reshaped our conception with his principles.
Most of Dalton's principles still hold true today: atoms cannot be destroyed or created during a chemical change, allowing the total mass of matter to remain constant (the law of conservation of matter). This argues that substances like copper, which consist of one type of atom, cannot be broken down to simpler substances composed of fewer types of atoms.
However, some of his postulates, notably those surrounding isotopes, had to be modified. Originally Dalton thought that all atoms of the same element had the same mass and properties. This notion was altered in the wake of isotopes - variations of elements with different masses - to clarify that atoms of the same element must have identical chemical properties.
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If a wave has a wave height of 5 meters, in what depth of water would it begin to break?
Answer:
6.5 meters
Explanation:
Background Knowledge:
The most familiar example of breaking wave is the breaking of water surface waves on a coastline.
Explanation:
The process of Wave breaking in most of the cases occurs when the amplitude reaches the point that the crest of the wave actually overturns
Factors by which waves are produced:
Different type of waves are produced and varied according to different type of factors. These factors are
Wind direction
Type of swell
Sea floor features
Slope of sea bed
Direct answer of the question:
In general rule, Waves start to break on reaching a water depth of 1.3 times the wave height.
In this question wave height is 5 meters so wave breaks on
5 × 1.3 = 6.5 meters
Final answer:
Wave breaking occurs when a wave's particle velocity exceeds the velocity of the wave crest due to specific conditions. A wave with a height of 5 meters will start breaking when the depth of water decreases to a certain point. This understanding is vital for predicting wave behavior where it begins to break.
Explanation:
Wave breaking occurs when a wave's particle velocity exceeds the velocity of the wave crest, typically at a crest angle of about 120°.
In the case of a wave height of 5 meters, when the depth of water decreases to the point where the wave celerity is exceeded, the wave will begin to break.
Understanding the relationship between wave height, water depth, and wave-breaking is crucial in predicting where waves will start breaking.
A diamond is made of pure carbon. A 1.6-cm³ sample of diamond has a mass of 5.6 g.what is the density of carbon?
Answer:
d = 3.5 g/cm³
Explanation:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
Symbol:
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.
Given data:
Mass of diamond = 5.6 g
Volume = 1.6 cm³
Density = ?
Solution:
d = m/v
d = 5.6 g/ 1.6 cm³
d = 3.5 g/cm³
The yeast acted as a catalyst. Explain the purpose of a catalyst in a reaction
Answer:
The catalyst speeds up the chemical reaction.
Explanation:
The process in which chemical reaction rate increases by addition of substance is termed as a catalyst. The chemical reaction happens faster when a catalyst is present because it gives an alternative reaction pathway with lower activation energy.
The catalyst usually forms a temporary intermediate that helps in regenerating the original catalyst in the cyclic process. Yeast when added in a mixture work as a catalyst and helps with chemical reaction.
Acid formulas can be distinguished from base formulas because acid formulas usually and base formulas .
A.
begin with hydrogen; pair a metal with a hydroxide ion
B.
begin with a nonmetal; pair a nonmetal with a hydoxide ion
C.
pair a metal with a hydrogen ion; begin with a nonmetal
D.
pair a metal with a hydroxide ion; begin with hydrogen
Answer:
A. begin with hydrogen; pair a metal with a hydroxide ion
Explanation:
Acid can be distinguished from base on the basis of formulas in such a way that acid formula start with hydrogen.
For example:
Hydrochloric acid is strong acid. Its formula is HCl.
It start with hydrogen
Sulfuric acid is acid. Its formula is H₂SO₄
it is also start with hydrogen.
Base:
Base is distinguish from acid in such a way that in base formula metal is pair with hydroxide ion.
For example:
Sodium hydroxide is base. Its formula is NaOH.
sodium is metal while OH is hydroxide ion.
Potassium hydroxide is base. its formula is KOH.
potassium is metal and OH is hydroxide ion.
PLEASE HELP ASAP
Half equation for zinc atoms changing into zinc ions
Answer:
Zn(s) -> Zn2+(aq) + 2e
Explanation:
Zinc atoms = no charge
Zinc ions = +ve charge
The process of half equation for zinc is called oxidation .
(oxidation means loss of electrons)
What are the 2 products of photosynthesis
Final answer:
The 2 products of photosynthesis are glucose and oxygen. Glucose acts as the food source for plants, while oxygen is a waste product necessary for animal life.
Explanation:
The 2 products of photosynthesis are glucose and oxygen. Glucose is the main product, which is a sugar that acts as the food source for plants. Oxygen is a waste product that is released into the atmosphere and is necessary for animal life to survive. Without photosynthetic organisms like plants, there wouldn't be enough oxygen in the atmosphere for animals to breathe.
4. A friend says cells do nothing during
interphase. Do you agree or disagree?
Explain why.
Answer:
disagree
Explanation:
the cell copies its DNA in preparation for mitosis. Interphase is the 'daily living' or metabolic phase of the cell, in which the cell obtains nutrients and metabolizes them, grows, reads its DNA, and conducts other "normal" cell functions.
Answer:
I disagree
Explanation:
There are 3 stages in INTERPHASE:
1) G1 (Gap 1)
2) S (DNA SYNTHESIS)
3) G2 (Gap 2)
1) G1 (Gap 1)
-all life processes are active and happening in the cell (MRS NERG)
-this is causing the cell to GROW in size
-also where more organells and proteins are made
2) S (DNA SYNTHESIS)
- the cell duplicates DNA so that the daughter cells hich it will divide into in mitosis will have each of its DNS
-energy is also save up in ATP (excess energy from respiration will be used for dividing in MITOSIS)
3) G2 (GAP 2)
- This is a CONTROL CHECKPOINT (where the cell checks for repairs which are fixed by the cell itself)
THAT'S IT (I GUESS)
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-
What is the base ionization constant expression for ammonia?
The base ionization constant expression for ammonia is represented as NH3(aq) + H₂O(l) ⇌ NH4+(aq) + OH¯(aq). The ionization constant, Kb, can be calculated using the formula Kb = [NH4+][OH-] / [NH3]. This is important for understanding ammonia's behavior in various reactions and solutions.
Explanation:The base ionization constant expression for ammonia (NH3), a weak base, is represented as follows: NH3(aq) + H₂O(l) ⇌ NH4+(aq) + OH¯(aq). In this case, the equilibrium of the ionization reaction of ammonia with water results in an ammonium ion (NH4+) and a hydroxide ion (OH-).
The ionization constant for this base is denoted as Kb. The specific value of Kb for ammonia can be found in tables of ionization constants for weak bases or calculated using the formula Kb = [NH4+][OH-] / [NH3], where the square brackets denote the equilibrium concentrations of the respective species.
The ionization of ammonia in water is a fundamental concept in acid-base chemistry and is vital for understanding its behavior in various chemical reactions and solutions.
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According to collision theory, which species must collide for a chemical reaction to proceed?
reactants with activated complex
reactants only
products only
reactants and products
“Reactants” must "collide" for a "chemical reaction" to proceed.
Option: B
Explanation:
Collision theory explains why collision of reactant is primary stage for any "chemical reaction" to take place. According to it “rate of reaction is proportional to the rate of reactants collisions”. Orientation of reacting species during collision is important to result into product, where atoms are bonded together. Adequate amount of energy is compulsory to allow mutual penetration of reacting species valence shells for rearrangement of electrons and allow formation of new bonds. While activated complex (which is unstable species) formation is transition state of chemical reaction having very short life and mostly undetectable.
Answer:
reactants only
Explanation:
Temperature is proportional to the average kintetic energy of particles in an object . Thus an increase in temperature results in an
Answer: Increase in the average kinetic energy.
Explanation: They are proportional so if one increases the other increases.
Final answer:
Temperature reflects the average kinetic energy of particles in an object; an increase in temperature results in an increase in this energy, leading to faster movement of particles, greater entropy, and potentially faster chemical reactions.
Explanation:
Kinetic Energy and Temperature Relationship
Temperature is a measure of how hot or cold an object is and is directly proportional to the average kinetic energy of the particles within that object. An increase in temperature leads to an increase in the average kinetic energy, which is observable as more extensive vibrations in solids, more rapid translations in liquids and gases, and a larger distribution of kinetic energies among the particles. This results in more frequent particle collisions and an increase in entropy, due to the more dispersed distribution of kinetic energies at high temperatures.
In the context of chemical reactions, the increase in temperature and kinetic energy tends to create a faster reaction rate, as particles move more quickly and are more likely to come into contact to react. It is critical to understand that no chemical reaction or phase change is considered in this explanation. The focus is strictly on the relation between thermal energy, temperature, and kinetic energy.
Which reaction is a decomposition reaction?
Answer:
See the answer below , please.
Explanation:
In a decomposition reaction, a certain compound is "broken" to give two or more different products.
An example for compound AB, giving as products A and B:
AB -> A + B
In the case of water:
2H20 -> 2H2 + 02, water decomposes giving Hydrogen and Oxygen
Answer:
The answer is 2 KClO₃ → 2 KCl + 3 O₂
Explanation:
In a decomposition reaction, a single substance decomposes, producing two or more different substances. That is, two or more substances are formed in this type of reactions from a compound. The atoms that form a compound are separated to give the products according to the formula:
AB → A + B
This type of reactions can occur spontaneously or caused by certain external factors that promote the breakdown of the molecule into simpler substances.
So in this case 2 KClO₃ → 2 KCl + 3 O₂ is a decomposition reaction. Potassium chlorate decomposes to give potassium chloride and oxygen gas as a product.
In an ionic crystal, these attract each other.
a. negative ions
b. positive and negative atoms
c. positive and negative ions
d. positive ions
C
Ionic crystals are made from ions that are bonded together by ionic bonds. An example is salt crystals that are made of sodium and chloride ions.
Explanation:
An ionic bond is formed when one atom donates electrons to another atom so they both attain stable electron configuration. The two atoms are then bound by their acquired charges. For example sodium atom2.8.1) donates its valence electrons to chlorine atom (2.8.7). They both achieve stable electron configuration of 2.8 and 2.8,8 respectively. Because sodium ion will now have a positive charge (because it has more protons than electrons) and chloride ion will have a negative charge because it has more electrons than protons, the two are bonded together electrostatically forming ionic bonds.
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When a plant is entering the Calvin cycle of photosynthesis_____.
A). light energy is required to proceed
B). light energy is not required to proceed
C). light energy and stored energy is required to proceed
D). light energy cannot be present to proceed
Answer:
The answer is B, light energy is not required to proceed
Explanation:
I got it right on my assignment
Answer:
light energy
Explanation:
Write a net ionic equation to show why solid sodium hydroxide, NaOH (s), forms a basic solution when it dissolves in water
When solid sodium hydroxide (NaOH) dissolves in water, it dissociates into Na+ and OH- ions. The OH- ions react with water to produce more hydroxide ions and hydrogen ions, resulting in a basic solution.
Explanation:The net ionic equation for the dissolution of solid sodium hydroxide, NaOH (s), in water involves the dissociation of NaOH into its constituent ions:
2NaOH (s) → 2Na+ (aq) + 2OH- (aq)
The OH- ions contribute to the basicity of the solution by reacting with water to produce hydroxide ions (OH-) and hydrogen ions (H+):
OH- (aq) + H2O (l) → OH- (aq) + H2O (l)
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Final answer:
Sodium hydroxide (NaOH) forms a basic solution when dissolved in water by dissociating completely into sodium (Na+) and hydroxide (OH−) ions, with the hydroxide ions responsible for increasing the solution's basicity.
Explanation:
The question relates to how solid sodium hydroxide (NaOH) forms a basic solution when dissolved in water. To illustrate this, we use the net ionic equation, which highlights the dissociation process of NaOH into ions in an aqueous solution. The equation is as follows:
NaOH(s) → Na+ (aq) + OH− (aq)
This equation shows that solid sodium hydroxide dissociates completely into sodium ions and hydroxide ions upon being dissolved in water. The presence of hydroxide ions (OH−) is crucial because they increase the hydroxide ion concentration in the solution, making it basic. Sodium hydroxide is a strong base, and this complete dissociation is characteristic of strong bases, further emphasizing the significance of the hydroxide ions in rendering the solution basic.
I need the answers to all three questions pls:
8. As a sulfur atom gains electrons, its radius
A) decreases
B) increases
C) remains the same
9. Which element forms an ion larger than its atom?
A) Na B) Ne C) Ba D) Br
10. Which of the following particles has the smallest
radius?
A) Na B) K° C) Na+ D) K+
Answer:
Explanation:
8) As a sulfur atom gains electrons, its radius
A) decreases
B) increases
C) remains the same
Answer:
Increases
Explanation:
when an atom form ion its atomic radius changed from neutral atomic radius.
if the atom form cation its atomic radius is smaller than neutral atomic radius.
If atom form anion its anionic radius is larger than the neutral atomic radius.
The reason is that when electron is remove energy shell deduced so cation get smaller ionic radii while in case of anion electron is added and size increase.
when sulfur gain electrons it form anion that's why its radius increases.
9) Which element forms an ion larger than its atom?
A) Na B) Ne C) Ba D) Br
Answer;
Br
Explanation:
when an atom form ion its atomic radius changed from neutral atomic radius.
if the atom form cation its atomic radius is smaller than neutral atomic radius.
If atom form anion its anionic radius is larger than the neutral atomic radius.
The reason is that when electron is remove energy shell deduced so cation get smaller ionic radii while in case of anion electron is added and size increase.
In given list of elements sodium and barium form cation while bromine form anion.
That's why anion of bromine is larger than atom.
while neon is inert it cannot form ion.
10. Which of the following particles has the smallest
radius?
A) Na B) K° C) Na+ D) K+
Answer:
Na⁺
Explanation:
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased .
Sodium and potassium are present in group one. Sodium is present in period three while potassium is present in period four. So atomic size of sodium is smaller and when it form the cation its cation is smaller than its atom because of losing of electron.The reason is that when electron is remove energy shell deduced so cation get smaller ionic radii
During an experiment a student measured the temperature of water while it boiled in a pot on a stove. The temperature of the water stayed at 100°C during the entire time that the water was boiling.
Answer:
c,interpretation of the data
Explanation:
A good scientific explanation needs to be based on both data collected in an investigation and on the ability to interpret what the data means.
Normally, adding heat energy increases the temperature of a substance. However, during a phase change, the temperature of the substance stays constant. This happens because the heat energy is being used to change the phase of the matter instead of the temperature.
Answer:
The temperature of the water stayed at [tex]100^{0} C[/tex] because the temperature of a pure water does not increase at its boiling point, [tex]100^{0} C[/tex]. This is due to latent heat of vaporisation.
Explanation:
During a change of state of a substance, the temperature does not change due to latent heat of the substance. Latent heat is the amount of heat required to convert a unit mass of a substance from one state to another without a change in its temperature. There are two types of latent heat, latent heat of fusion anf latent heat of vaporisation.
So during the experiment, the water got to its boiling point and continues to boil at this constant temperature until it would change completely to steam at that temperature. After the conversion process, the temperature begins to increase.
The latent heat of vaporisation came into action during the process of boiling the water at constant temperature. That's why the temperature of the water did not increase even after reaching its boiling point ([tex]100^{0} C[/tex] ).
Which statements best describe the motion of Car A
and Car B? Check all that apply
Car A and Car B are both moving toward the origin
Car A and Car B are moving in opposite directions
Car A is moving faster than Car B.
Car A and Car B started at the same location
Car A and Car B pass each other at the crossover
point on the graph
Answer:
Car A and Car B are moving in opposite directions.
Car A is moving faster than Car B.
Car A and Car B pass each other at the crossover point on the graph.
Explanation:
Just took did the assignment.
Answer:
Car A and Car B are moving in opposite directions.
Car A is moving faster than Car B.
Car A and Car B pass each other at the crossover point on the graph
PLEASE HELP WILL GIVE BRAINLIEST...
Match each of the unknown ions to its appropriate description.
1. Y3−
2. V2+
3. Z2−
4. X3+
a) A metal that lost two electrons
b) A metal that lost three electrons
c) A nonmetal that gained three electrons
d) A nonmetal that gained two electrons
Answer:
Y³⁻ A non metal that gained three electrons.
V²⁺ A metal that lost two electron
Z²⁻ A non metal that gained two electrons
X³⁺ A metal that lost three electrons
Explanation:
Metals lost the electrons and form cation
while non metals gain the electrons and form anion.
Y³⁻
c) A non metal that gained three electrons.
Non metal gain three electrons and form anion with the charge of -3.
V²⁺
a) A metal that lost two electron
A metal lost two electrons and form cation with charge of +2.
Z²⁻
d) A non metal that gained two electrons
A non metal that gained two electrons and form anion with charge of -2.
X³⁺
b) A metal that lost three electrons
A metal that lost three electrons and form cation with charge of +3.
Y³⁻ A non metal that gained three electrons.
V²⁺ A metal that lost two electron
Z²⁻ A non metal that gained two electrons
X³⁺ A metal that lost three electrons
Explain how an owl captures energy from the sun when it eats a mouse
Answer:
The mouse Eats plants that use the sun as a food source
Explanation:
An owl indirectly captures sun's energy by consuming a mouse, which has fed on plants that perform photosynthesis, illustrating energy transfer through a food chain.
Explanation:An owl captures energy from the sun indirectly by eating a mouse. This process begins with plants using photosynthesis to convert solar energy into chemical energy stored within carbohydrate molecules. A mouse then eats these plants, and the energy from the plants is used to fuel the mouse's body. When an owl eats the mouse, it obtains this energy and transforms it through biochemical reactions to sustain its own life processes. This sequence illustrates energy transfer through a food chain, with the sun as the original energy source.
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What is the approximate bond angle around the central carbon atom in acrolein?
The bond angle around the central carbon atom in acrolein is approximately 120 degrees due to the trigonal planar geometry resulting from sp² hybridization.
Explanation:The geometry of a molecule, such as acrolein, is intrinsically linked to the hybridization of its central atom. In the case of acrolein, this central carbon atom is engaged in a double bond with another carbon atom and is also connected to an oxygen atom. This unique bonding arrangement leads to the central carbon atom adopting an sp² hybridization state. Consequently, this sp² hybridization results in a trigonal planar geometry for the central carbon atom, where the three bonding orbitals are arranged in a symmetric, triangular fashion.
In this trigonal planar configuration, the bond angles formed by the carbon-oxygen-carbon atoms are approximately 120 degrees. This specific bond angle, characteristic of sp² hybridization, is a fundamental aspect of acrolein's molecular structure, significantly influencing its chemical reactivity and properties. Understanding the relationship between hybridization and molecular geometry is crucial in predicting how molecules like acrolein will interact with other substances in various chemical reactions.
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The approximate bond angle around the central carbon atom in acrolein is about 120 degrees.
Acrolein, also known as 2-propenal, has the chemical formula C3H4O. The central carbon atom in acrolein is sp2 hybridized due to the presence of a double bond with one of the neighboring carbon atoms. This sp2 hybridization results in a trigonal planar molecular geometry with bond angles of approximately 120 degrees between the hybridized orbitals.
In acrolein, the central carbon atom is bonded to two other carbon atoms and a hydrogen atom, with a double bond to one of the carbon atoms and a single bond to the other carbon atom and the hydrogen atom. The double-bonded carbon atom is also sp2 hybridized, contributing to the trigonal planar geometry around the central carbon. The oxygen atom attached to the double-bonded carbon does not significantly affect the bond angle around the central carbon.
Therefore, the bond angles around the central carbon atom in acrolein are close to the ideal value of 120 degrees for a trigonal planar geometry, with slight deviations due to the different substituents and the double bond. However, these deviations are typically small, and the bond angle remains approximately 120 degrees.
How many moles are in 25.0 mL of C2H6O? The density of C2H6O is 0.785 h/mL.
Hint: use formula: mass = density x volume. )
0.4266 moles of C₂H₆O
Explanation:
The problems asks for the number of moles in 25 mL of C₂H₆O with a density of 0.785 g/mL.
First we calculate the mass of C₂H₆O:
density = mass / volume
mass of C₂H₆O = density × volume
mass of C₂H₆O = 0.785 × 25
mass of C₂H₆O = 19.625 g
Now we calculate the number of moles of C₂H₆O:
number of moles = mass / molecular weight
number of moles of C₂H₆O = 19.625 / 46
number of moles of C₂H₆O = 0.4266 moles
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The number of moles in a 25.0 mL sample of C2H6O with a density of 0.785 g/mL is approximately 0.426 moles.
Explanation:To calculate the number of moles of C2H6O in a 25.0 mL sample given its density, you would first calculate the mass of the liquid using the formula: mass = density × volume. With a density of 0.785 g/mL, the mass of C2H6O in 25.0 mL would be 25.0 mL × 0.785 g/mL = 19.625 grams. The molar mass of C2H6O (which is ethanol or dimethyl ether, depending on the structural arrangement, but the question likely refers to ethanol) is approximately 46.07 g/mol. Therefore, the number of moles is calculated as:
mass / molar mass = 19.625 g / 46.07 g/mol = approximately 0.426 moles.
This calculation yields the number of moles present in the given volume of the substance.
Three examples why cell division is important
Answer:
Cell division is important for growth,maintenance of proper chromosome number,wound healing
Explanation:
1 Cell division results in the formation of new cells which further undergo division to form new cells and so forth.Thus many cells are formed which are organized in tissues.Tissues then builds up organs and a number of organs builds up total body.
2 Cell division helps to maintain its chromosome number within the newly formed daughter cells.
3 Division of cells result in the formation of new cells in the site of wound and this accumalation of new cells in the wound region replace damaged and dead cells thus ultimately results in wound healing.
Stoichiometry Practice 2
For each of the problems below:
a. Write the balanced chemical equation.
b. Identify the given (with units) and what you want to find (with units).
c. Show set up with units. Check work, give final answer with units and label.
1. Using the Hoffman apparatus for electrolysis, a chemist decomposes 36 g of water
into its gaseous elements. How many grams of hydrogen gas should she get
(theoretical yield)?
Bal. Equation:
ven: 3log of water
ant;
HELPPP ME NOWW
Answer:
a = The chemical equation written by balancing the total number of atoms of each element in reactants and products is called balanced chemical equation.
Which of these could be their own ecosystem? Please select ALL that apply.
Question 1 options:
A. An aquarium
B. The soil in a backyard
C. Lake Erie
D. A dead tree
I will mark you brainliest
Answer: Option A, B and C
Explanation:
An ecosystem can be defined as the place which can survive on its own. There are various types of biotic and abiotic components available in the ecosystem.
An aquarium, lake and soil in backyard can be a source of ecosystem because they all have biotic and abiotic components in themselves. An aquarium has water, small plants in them. they make food by the help of sunlight and some smaller fishes feed on them.
Soil also has small insects and large plants that live on their own without the need of anything outside that environment.
If you multiply an object's weight by its height, what value do you compute?
A. total momentum
B. gravitational potential energy
C. kinetic energy
D. nonconservative energy
What causes the emission of radiant energy that produces characteristic spectral lines for a given element?
Answer:
When electrons move from a higher energy level to a lower one, photons are emitted, and an emission line can be seen in the spectrum. Absorption lines are seen when electrons absorb photons and move to higher energy levels. ... An atom in its lowest energy level is in the ground state.
In an emission spectrum when an electron moves from higher energy level to lower energy level it causes emission of radiant energy that produces characteristic spectral lines for a given element.
What is an emission spectrum?
Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.
Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.
Collection of different transitions with respect to different wavelengths makes up an emission spectrum.Emission spectrum of each element is unique and therefore spectroscopy is used to identify elements which are present in different substances.
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Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients. C(s) + H2(g) --> C2H6(g)?
Answer:
2C(s) + 3H2(g) --> C2H6(g)
Answer: 2C(s) + 3H2(g) = C2H6(g)
Explanation:
In balancing chemical equations, the reactant must be equal to the product. I.e law of conservation of matter must hold.
2 moles of carbon would react with 3 moles of hydrogen to give 1 mole of methane
2C(s) + 3H2(g) = C2H6(g)
If there were an element above fluorine in the periodic table what phase would you expect it to be in (at room temp)?
If there were an element above fluorine, its state would be a gas. This is because fluorine is located in the non-metal section of the periodic table which can all be found as a gas at room temperature.
The reaction 2Fe + 3Cl2 → 2FeCl3 is an example of which type of reaction?
combustion reaction
single-replacement reaction
combination reaction
decomposition reaction
Answer:
combination reaction
Explanation:
In a combination reaction two reactants combine to form a single product, like in this case.
Other options are incorrect because:
combustion reaction involve oxygen as a reactant,in a single-replacement reaction, one element is substituted for another element in a compound,in a decomposition reaction, a reactant is decomposed into two or more products.The reaction 2Fe + 3Cl2 → 2FeCl3 is an example of a combination reaction, where two or more simple substances combine to form a single product.
Explanation:The chemical reaction provided, 2Fe + 3Cl2 → 2FeCl3, is an example of a combination reaction. In this type of reaction, two or more reactants (in this case, Fe and Cl2) combine to form a single product (FeCl3). The reactants are usually elements or simple compounds, and the product is a compound made up of all the atoms from the reactants.
Unlike a combustion reaction, which involves burning in oxygen, or a single-replacement reaction, where one element replaces another in a compound, this combination reaction involves simple substances joining together.
Learn more about Combination Reaction here:https://brainly.com/question/37930038
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