Question 1

Which of the following best describes a chemical property?

Accepted Answer

The ability of iron to rust when exposed to oxygen

Question 2

Which of the following is an example of a chemical change?

Accepted Answer

Burning wood in a fireplace

Question 3

A student mixes methanol ($$\mathrm{CH_3OH}) $$and oxygen ($$\mathrm{O_2$}) in a $$closed container and ignites the mixture. The reaction produces carbon dioxide and water. Which of the following statements is true about this process?

Accepted Answer

It is a chemical change because new substances are formed.

Question 4

Which of the following is NOT a chemical property?

Accepted Answer

Boiling point of ethanol

Question 5

Which equation correctly represents the combustion of methanol ($$\mathrm{CH_3OH}) in $$oxygen?

Accepted Answer

$$2\mathrm{CH_3OH}(g) + 3\mathrm{O_2$}(g) \rightarrow 2\mathrm{CO_2$}(g) + 4\mathrm{H_2O}(g)$$

Question 6

Which of the following best distinguishes a chemical property from a physical property?

Accepted Answer

A chemical property describes how a substance interacts with other substances to form new substances.

Question 7

Which of the following is an example of an intensive property?

Accepted Answer

Density of a gold bar

Question 8

A sample of silver is exposed to air and gradually turns black due to the formation of silver sulfide. This process is best described as:

Accepted Answer

A chemical change involving a chemical property of silver

Question 9

Which of the following statements about the classification of matter is correct?

Accepted Answer

A mixture can be separated into its components by physical means.

Question 10

Which of the following is a chemical property of hydrogen gas?

Accepted Answer

It reacts explosively with oxygen to form water.

Question 11

A student observes that sodium metal reacts vigorously with water, producing hydrogen gas and a solution of sodium hydroxide. Which property of sodium is being demonstrated?

Accepted Answer

Chemical property

Question 12

Which of the following is an example of a physical change?

Accepted Answer

Evaporation of water from a puddle

Question 13

Which of the following best describes an extensive property?

Accepted Answer

It depends on the amount of matter present.

Question 14

Which of the following is a correct statement about physical and chemical changes?

Accepted Answer

Physical changes do not alter the chemical composition of a substance.

Question 15

A sample of water is heated from $$25\ ^\circ\mathrm{C} to$$ $$100\ ^\circ\mathrm{C}$$ and then boiled to produce steam. Which of the following statements is true?

Accepted Answer

Both heating and boiling are physical changes.

Question 16

Which of the following is an example of a process that involves both a physical and a chemical change?

Accepted Answer

Burning a candle (melting wax and combustion)

Question 17

Which of the following is a correct statement about SI units?

Accepted Answer

The SI unit for mass is the kilogram ($$\mathrm{kg}).$$

Question 18

Which of the following best describes the difference between a physical and a chemical property?

Accepted Answer

A chemical property can only be observed during a chemical reaction, while a physical property can be observed without changing the substance's identity.

Question 19

Which of the following is an example of a chemical property that is important in the medical field?

Accepted Answer

The ability of hemoglobin to bind oxygen in the blood

Question 20

A chemist measures the mass and volume of a liquid and calculates its density. Which type of property is density?

Accepted Answer

Intensive property

Chemical Properties and Classification of Matter: Study Notes

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