Question 1

Which of the following best describes methane ($$CH_4) as $$used in laboratory settings?

Accepted Answer

It is a compound because it consists of chemically bonded carbon and hydrogen atoms.

Question 2

When sodium chloride ($$NaCl) is $$dissolved in water to form saltwater, what type of change occurs?

Accepted Answer

A physical change, because the process is reversible and no new substances are formed.

Question 3

Baking soda is also known as sodium bicarbonate. What is its chemical formula?

Accepted Answer

$$NaHCO_3$$

Question 4

When vinegar (acetic acid) is added to baking soda ($$NaHCO_3$$), bubbling occurs. What does this indicate?

Accepted Answer

A chemical change, because a gas is produced and new substances are formed.

Question 5

Copper wire is classified as which of the following?

Accepted Answer

An element, because it consists of only copper atoms.

Question 6

Which property allows copper to be drawn into wires?

Accepted Answer

Ductility

Question 7

Density is classified as which type of property?

Accepted Answer

Intensive physical property

Question 8

In a glass of oil and water, oil forms the top layer. What does this indicate about the density of oil compared to water?

Accepted Answer

Oil is less dense than water.

Question 9

A mixture of oil and water is best classified as:

Accepted Answer

A heterogeneous mixture

Question 10

Aluminum foil is classified as which of the following?

Accepted Answer

An element

Question 11

Which property allows aluminum to be hammered into thin sheets?

Accepted Answer

Malleability

Question 12

Steel is an alloy primarily made of iron and carbon. What type of mixture is steel?

Accepted Answer

Solution

Question 13

When a small amount of chromium is added to steel to prevent rusting, what type of change is this?

Accepted Answer

Chemical change, because the composition and properties are altered.

Question 14

Which separation technique would be most effective for separating sand from water?

Accepted Answer

Filtration

Question 15

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

Accepted Answer

Dissolving sugar in water

Question 16

Which statement about gases is correct?

Accepted Answer

Gases have neither definite shape nor definite volume.

Question 17

Which of the following is an intensive property?

Accepted Answer

Density

Question 18

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture of two or more substances

Question 19

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

Classification of Matter and Properties: Chapter 3 Review Study Notes

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