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Question

(1 point)
Responses

The total mass of the products would be something less than 3.72 grams, because some of the mass burned into nothing.
The total mass of the products would be something less than 3.72 grams, because some of the mass burned into nothing.

The total mass of the products would be greater than 3.72 grams, because water is really heavy.
The total mass of the products would be greater than 3.72 grams, because water is really heavy.

The total mass of the products would equal 1.80 grams, because the mass of oxygen gas doesn't make a difference.
The total mass of the products would equal 1.80 grams, because the mass of oxygen gas doesn't make a difference.

The total mass of the products would be 3.72 grams, because mass cannot be gained or lost in the process.
The total mass of the products would be 3.72 grams, because mass cannot be gained or lost in the process.

Answer 1

The correct response is:

The total mass of the products would be 3.72 grams, because mass cannot be gained or lost in the process.

This follows the law of conservation of mass, which states that in a closed system, the total mass of reactants must equal the total mass of products, regardless of the changes that occur during a chemical reaction.

Answer 2

b. What does the law of conservation of matter (or the law of conservation of mass) tell the students?(1 point)
Responses

Matter is never gained or lost in a chemical or physical process.
Matter is never gained or lost in a chemical or physical process.

Matter might be lost in a chemical or physical process.
Matter might be lost in a chemical or physical process.

Matter might be gained in a chemical or physical process.
Matter might be gained in a chemical or physical process.

Matter is always gained or lost in a chemical or physical process.

Answer 3

The correct response is:

Matter is never gained or lost in a chemical or physical process.

This statement accurately reflects the law of conservation of mass, which asserts that the total amount of matter remains constant in an isolated system during a chemical reaction or physical change.

Answer 4

a. There are 12 atoms of hydrogen shown on the reactant side. How many total atoms of hydrogen must be on the product side?

(1 point)
Responses

2
2

6
6

12
12

18

Answer 5

The correct response is:

12

According to the law of conservation of mass, the number of atoms of each element must remain the same on both the reactant side and the product side of a chemical equation. Therefore, if there are 12 atoms of hydrogen on the reactant side, there must also be 12 atoms of hydrogen on the product side.

Answer 6

a. The boiling point of water is 100o
C. The boiling point of hydrogen peroxide is about 150o
C. Does this make sense? Why or why not.

(1 point)
Responses

No, it doesn't make sense, because we expect products and reactants to have different properties.
No, it doesn't make sense, because we expect products and reactants to have different properties.

Yes, it makes sense, because a physical change took place.
Yes, it makes sense, because a physical change took place.

Yes, it makes sense, because we expect products and reactants to have different properties.
Yes, it makes sense, because we expect products and reactants to have different properties.

No, it doesn't make sense, because a physical change took place.

Answer 7

The correct response is:

Yes, it makes sense, because we expect products and reactants to have different properties.

In chemical reactions, reactants are transformed into products, which can result in substances having differing physical and chemical properties, including boiling points. Therefore, it's reasonable to observe that water and hydrogen peroxide have different boiling points.

Answer 8

b. How would you expect the density of water to compare to the density of hydrogen peroxide?(1 point)
Responses

It is most likely that the density of water would be the same as the density of hydrogen peroxide.
It is most likely that the density of water would be the same as the density of hydrogen peroxide.

It is most likely that the density of water would be different from the density of hydrogen peroxide.
It is most likely that the density of water would be different from the density of hydrogen peroxide.

It is impossible to predict how the densities are likely to compare.
It is impossible to predict how the densities are likely to compare.
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Answer 9

The correct response is:

It is most likely that the density of water would be different from the density of hydrogen peroxide.

Water (H₂O) and hydrogen peroxide (H₂O₂) have different molecular structures and compositions, which typically leads to differences in their physical properties, including density. Generally, hydrogen peroxide has a higher density than water.

Answer 10

b. How would you expect the density of water to compare to the density of hydrogen peroxide?(1 point)
Responses is it ganna be the same or different?

Answer 11

The correct response is:

It is most likely that the density of water would be different from the density of hydrogen peroxide.

Water and hydrogen peroxide have different molecular compositions and structures, which generally results in different densities. Hydrogen peroxide typically has a higher density than water.