Question 1

In a chemical reaction, matter is neither created nor destroyed. Which law does this refer to?

Accepted Answer

Law of Conservation of Mass

Question 2

Which of the following best describes the Law of Multiple Proportions?

Accepted Answer

When two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in ratios of small whole numbers.

Question 3

A sample contains 2.0 g of hydrogen and 16.0 g of oxygen. According to the Law of Definite Proportions, what compound is most likely formed?

Accepted Answer

H$$_2O$$

Question 4

Which of the following is an example of the Law of Conservation of Mass?

Accepted Answer

Combining 2 g of hydrogen with 16 g of oxygen produces 18 g of water.

Question 5

Which law states that a chemical compound always contains exactly the same proportion of elements by mass?

Accepted Answer

Law of Definite Proportions

Question 6

If 12 g of carbon reacts completely with 32 g of oxygen to form carbon dioxide, what is the total mass of carbon dioxide formed according to the Law of Conservation of Mass?

Accepted Answer

$$44\ \mathrm{g}$$

Question 7

Which of the following best illustrates the Law of Multiple Proportions?

Accepted Answer

CO and CO$$_2$$ are both compounds of carbon and oxygen, but the ratio of oxygen in CO$$_2 to CO is 2$$:1.

Question 8

A student mixes 5.0 g of sodium with 7.7 g of chlorine to form sodium chloride. If all the sodium reacts, what mass of sodium chloride is produced?

Accepted Answer

$$12.7\ \mathrm{g}$$

Question 9

Which of the following statements is NOT consistent with the Law of Conservation of Mass?

Accepted Answer

The total mass of products is greater than the total mass of reactants.

Question 10

Which law explains why the ratio of hydrogen to oxygen in water is always 2:1 by mass?

Accepted Answer

Law of Definite Proportions

Chapter 1: General Chemistry Study Guidance: Conservation of Mass

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