Question 1

Which of the following is an example of a chemical property?
Correct answer: Reactivity with oxygen

Accepted Answer

Reactivity with oxygen

Question 2

A student mixes sand and salt together in a beaker. Which classification best describes the resulting mixture?
Correct answer: Heterogeneous mixture

Accepted Answer

Heterogeneous mixture

Question 3

Which of the following statements best illustrates the Law of Conservation of Mass?
Correct answer: When 5 g of hydrogen reacts with 40 g of oxygen, 45 g of water is produced.

Accepted Answer

When 5 g of hydrogen reacts with 40 g of oxygen, 45 g of water is produced.

Question 4

Which of the following is NOT a physical property?
Correct answer: Flammability

Accepted Answer

Flammability

Question 5

A sample of matter is uniform throughout and can be separated into two substances by chemical means only. How should this sample be classified?
Correct answer: Compound

Accepted Answer

Compound

Question 6

Which scenario demonstrates a chemical change?
Correct answer: Iron rusting when exposed to air

Accepted Answer

Iron rusting when exposed to air

Question 7

A 25.0 g sample of magnesium reacts completely with oxygen to form 41.6 g of magnesium oxide. According to the Law of Conservation of Mass, what mass of oxygen reacted?
Correct answer: 16.6 g

Accepted Answer

16.6 g

Question 8

Which of the following best describes a homogeneous mixture?
Correct answer: A glass of salt water

Accepted Answer

A glass of salt water

Question 9

Which of the following is a pure substance?
Correct answer: Carbon dioxide

Accepted Answer

Carbon dioxide

Question 10

A student claims that dissolving sugar in water is a chemical change because the sugar disappears. Which is the best evaluation of this claim?
Correct answer: The claim is incorrect because the process is reversible and no new substance is formed.

Accepted Answer

The claim is incorrect because the process is reversible and no new substance is formed.

Question 11

Which of the following best distinguishes a compound from a mixture?
Correct answer: A compound has a fixed ratio of elements chemically combined.

Accepted Answer

A compound has a fixed ratio of elements chemically combined.

Question 12

A sealed container contains 100 g of reactants. After a chemical reaction, the products are found to have a mass of 98 g. What is the most likely explanation?
Correct answer: Some product escaped as a gas.

Accepted Answer

Some product escaped as a gas.

Question 13

Which of the following is an example of a heterogeneous mixture?
Correct answer: Blood

Accepted Answer

Blood

Question 14

Which property would you use to distinguish between a physical and a chemical change?
Correct answer: Formation of a new substance

Accepted Answer

Formation of a new substance

Question 15

Which of the following best describes an element?
Correct answer: A pure substance that cannot be separated into simpler substances by chemical means

Accepted Answer

A pure substance that cannot be separated into simpler substances by chemical means

Question 16

A chemist measures the density of a liquid as 1.25 g/mL. Which type of property is being measured?
Correct answer: Physical property

Accepted Answer

Physical property

Question 17

Which of the following best explains why mass is conserved in a chemical reaction?
Correct answer: Atoms are rearranged but not created or destroyed.

Accepted Answer

Atoms are rearranged but not created or destroyed.

Question 18

A student observes that when vinegar is mixed with baking soda, bubbles form and a new substance is produced. Which type of property is being demonstrated?
Correct answer: Chemical property

Accepted Answer

Chemical property

Question 19

Which of the following is the best example of a homogeneous mixture used in medicine?
Correct answer: Blood plasma

Accepted Answer

Blood plasma

Question 20

A 50.0 g sample of a compound is decomposed into 20.0 g of element X and 30.0 g of element Y. If you start with 100.0 g of the same compound, how much of element Y would you expect to obtain?
Correct answer: 60.0 g

Accepted Answer

60.0 g

Fundamental Concepts in Chemistry

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