Question 1

Which of the following best describes a chemical change?

Accepted Answer

Burning wood to produce ash and gases

Question 2

Which statement correctly distinguishes between a compound and a mixture?

Accepted Answer

A compound consists of two or more elements chemically bonded together.

Question 3

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

Accepted Answer

Density

Question 4

A student mixes sand and salt in a beaker. Which method can be used to separate this mixture, and why?

Accepted Answer

Filtration, because sand and salt are physically combined and have different particle sizes.

Question 5

Which of the following best describes an element?

Accepted Answer

A substance made of only one kind of atom.

Question 6

Which property would change if you cut a block of copper in half?

Accepted Answer

Mass

Question 7

A sample of water is heated from $$0^\circ \mathrm{C} to$$ $$100^\circ \mathrm{C}. $$Which type of change is this?

Accepted Answer

Physical change, because the composition of water does not change.

Question 8

Which of the following is a pure substance?

Accepted Answer

Carbon dioxide ($$\mathrm{CO}_2)$$

Question 9

Which statement about mixtures is correct?

Accepted Answer

Mixtures can be separated by physical means.

Question 10

A student claims that density is an extensive property. Which argument best refutes this claim?

Accepted Answer

Density does not change when the amount of substance changes.

Question 11

Which of the following best explains why burning gasoline in a car engine is a chemical change?

Accepted Answer

New substances such as carbon dioxide and water are formed.

Question 12

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 13

A sample of salt water is left in the sun until all the water evaporates, leaving salt behind. What type of change has occurred?

Accepted Answer

Physical change, because the composition of salt and water does not change.

Question 14

Which of the following is an example of a mixture?

Accepted Answer

Steel

Question 15

Which property is extensive?

Accepted Answer

Mass

Question 16

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

Accepted Answer

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

Question 17

A gold ring is melted and reshaped into a new design. Which statement is true?

Accepted Answer

This is a physical change because the gold's composition remains the same.

Question 18

Which of the following is a correct statement about compounds?

Accepted Answer

Compounds have a fixed composition and are made of two or more elements chemically bonded.

Question 19

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

Accepted Answer

Ability to react with oxygen

Question 20

A student measures the mass and volume of a liquid and calculates its density using $$	ext{density} = \frac{	ext{mass}}{	ext{volume}}. If $$the mass is doubled but the volume is also doubled, what happens to the density?

Accepted Answer

The density remains the same.

Fundamental Concepts in General Chemistry: Matter, Substances, and Properties

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