2. Law of Conservation of Mass Post test

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Question 1 of 15

1. Question
1 point(s)

Does the following chemical reaction represent the law of conservation of mass and the law of indestructibility of matter?

Yes. There are the same number of atoms of the reactants and products on each side.
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Yes. There chemical reaction is balanced on each side.
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No. There are more atoms on the reactants side of the reaction than there are on the products side of the reaction.
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No. There are less atoms on the reactants side of the reaction than there are on the products side of the reaction.
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Question 2 of 15

2. Question
1 point(s)

Which of the following is correct about reactions?

During nuclear reactions, atoms are rearranged and all the atoms present in the reactants are present in the products.
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During chemical reactions, atoms are rearranged and all the atoms present in the reactants are present in the products.
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During chemical reactions, alpha, beta, or gamma radiation is emitted from the nuclei of the atoms taking part in the reaction.
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During chemical reactions, the amount of energy given off is always more than the energy given off in nuclear reactions.
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Question 3 of 15

3. Question
1 point(s)

A chemical reaction is shown.

SnO2 + H2 → Sn + H2O

What is true about this chemical reaction?

It is unbalanced because the mass of the reactants is less than the mass of the products.
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It is balanced because the number of reactants is equal to the number of products.
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It is unbalanced because the mass of the reactants is greater than the mass of the products.
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It is balanced because the mass of the reactants is equal to the mass of the products
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Question 4 of 15

4. Question
1 point(s)

Ling is learning about chemical reactions in science class. She measured out 45 grams of vinegar and 10
grams of baking soda. When she mixed them together, a bubbling reaction occurred. After the reaction
stopped, she weighed the mixture and found that it weighed 54 grams. Which of the following best explains why
the mixture weighed less than the original ingredients?

The baking soda is floating on top of the vinegar.
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The new solution is less dense than vinegar or baking soda.
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Some of the vinegar evaporated during the experiment.
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The chemical reaction created a gas that left the mixture.
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Question 5 of 15

5. Question
1 point(s)

Which of the following represent the law of conservation of mass and law of indestructibility of matter?

2KBr + 2CaO → K2O + CaBr2
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LiCl + 2H2O → 2HCl + Li2O
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NaCl + H2O → NaO + 2HCl
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Na2S + 2KCl → 2NaCl + K2S
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Question 6 of 15

6. Question
1 point(s)
Match each part of the following chemical equation with its correct term:

Al + O₂ –> 4AlO₃
Sort elements
- Product
- Reactants
- Yield/Make/Produce
- Coefficient
- Subscript
4AlO3

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Al + O2

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–>

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4

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2

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Question 7 of 15

7. Question
1 point(s)

A student says that the chemical reactions below DO NOT represent the law of conservation of mass and law of indestructibility of matter. Is the student correct or incorrect?

The student is correct. There are not the same number of atoms on the reactants and products side of each chemical reaction.
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The student is correct. There are more of each type of atom in the products than there are in the reactants.
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The student is incorrect. There are the same number of each type of atom on the reactants and products side of each chemical reaction.
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The student is incorrect. There are more atoms in the reactants than there are in the products.
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Question 8 of 15

8. Question
1 point(s)

How can you tell the following model of a chemical reaction demonstrates the law of conservation of mass and the law of indestructibility of matter?

There are 4 Hydrogen (H) atoms on the reactants and products side, and 4 Oxygen (O) atoms on the reactants and products side.
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There are 5 Hydrogen (H) atoms on the reactants and products side, and 2 Oxygen (O) atoms on the reactants and products side.
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There are 3 Hydrogen (H) atoms on the reactants and products side, and 8 Oxygen (O) atoms on the reactants and products side.
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There are 5 Hydrogen (H) atoms on the reactants and products side, and 12 Oxygen (O) atoms on the reactants and products side.
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Question 9 of 15

9. Question
1 point(s)

Does the following model of a chemical reaction represent the law of conservation of mass and the law of indestructibility of matter?

Yes. There are the same number of each type of molecule on the reactants and products side of the chemical reaction.
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Yes. There are 5 white molecules on the reactants side and 8 white molecules on the products side.
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No. There are more of each type of molecule on the reactants side than there are on the products side.
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No. There are less of each type of molecule on the reactants side than there are on the products side.
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Question 10 of 15

10. Question
1 point(s)
Drag and drop the descriptions next to their correct definition.
Sort elements
- What goes into a chemical reaction
- What comes out of a chemical reaction
- means 'to make'
- the small number behind the element
Reactants

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Products

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Yields

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Subscript

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Question 11 of 15

11. Question
1 point(s)

The chemical reaction below represents the reaction between the elements hydrogen (H) and oxygen (O) when the compound water (H2O) is formed. Which statement below is the BEST explanation for why this chemical reaction describes the law of conservation of matter?

The total number of hydrogen and oxygen atoms in the reactants is equal to the total number of hydrogen and oxygen atoms in the products.
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The mass of hydrogen is twice the mass of oxygen in the reactants and is equal to the mass of the water in the product.
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Atoms of the elements hydrogen and oxygen react to form molecules of the compound water.
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Atoms of the elements hydrogen and oxygen are in the reactants and also in the products.
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Question 12 of 15

12. Question
1 point(s)

The equation below shows the products formed when a solution of silver nitrate (AgNO3) reacts with a solution of sodium chloride (NaCl) to produce sodium nitrate (NaNO3) and silver chloride (AgCl). Construct an explanation for how the total mass of the reactants relates to the mass of the products.

Because matter is conserved in a chemical reaction the total mass of the reactants is equal to the mass of silver chloride.
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Because matter is conserved in a chemical reaction the total mass of the reactants is equal to the total mass of the products.
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Because matter is not conserved in a chemical reaction the total mass of the reactants is less than the mass of silver chloride.
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Because matter is not conserved in a chemical reaction the total mass of the reactants is greater than the total mass of the products.
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Question 13 of 15

13. Question
1 point(s)

When sodium carbonate (Na2CO3) is mixed with calcium nitrate Ca(NO3)2 the result is the formation of a solid precipitate, in a solution of sodium nitrate (NaNO3). A student in the class claims that the chemical reaction for this process can be described by either one of the following two equations

The student is correct because both equations correctly illustrate the Law of Conservation of Matter.
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The student is not correct because only claim 1 correctly describes the Law of Conservation of Matter.
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The student is correct because both chemical equations show the same chemical elements on the products side an on the reactants side.
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The student is not correct because the number of atoms for each chemical element on the products side is different to the number of atoms for each chemical in the reactant side on each equation.
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Question 14 of 15

14. Question
1 point(s)

Construct an explanation for how you can determine how many grams of products are produced in a chemical reaction when four grams or reactants are used.

The law of conservation of matter states that in a chemical reaction the total mass of reactants is always half that of the total mass of products.
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Because the law of conservation of matter the total mass of the products could be between one and four grams but not more than four grams.
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The law of conservation of matter says that for a chemical reaction to occur it is necessary that the total mass of products be larger than the total mass of reactants.
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The law of conservation of matter indicates that if the total mass of the reactants in a chemical equation is four grams then four grams of products needed to be present.
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Question 15 of 15

15. Question
1 point(s)

Construct an explanation that BEST EXPLAINS for why the model of this chemical reaction obeys the Law of Conservation of Matter.

The model supports the Law of Conservation of Matter because they both start and end with the same types of particles.
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The model supports the Law of Conservation of Matter because there are the same number of diatomic molecules (molecules formed by two atoms) shown on both sides.
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The model supports the Law of Conservation of Matter because there are the same number of atoms of each element shown on both sides.
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The model supports the Law of Conservation of Matter because they both start and end with diatomic molecules (molecules formed by two atoms).
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2. Law of Conservation of Mass Post test

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