Question 1

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

Accepted Answer

Iron rusting in moist air

Question 2

A student mixes sand and salt in a beaker. Which type of matter is formed?

Accepted Answer

Heterogeneous mixture

Question 3

Which process describes the change from a solid directly to a gas?

Accepted Answer

Sublimation

Question 4

Which statement best explains why liquids have a definite volume but not a definite shape?

Accepted Answer

Particles in a liquid are close together but can move past each other

Question 5

Which of the following is a physical change?

Accepted Answer

Boiling water to produce steam

Question 6

A sample of ethanol ($$\mathrm{CH_3CH_2OH}) is $$classified as which type of matter?

Accepted Answer

Compound

Question 7

Which of the following is evidence that a chemical change has occurred?

Accepted Answer

Formation of a new substance

Question 8

Tap water is best classified as:

Accepted Answer

Homogeneous mixture

Question 9

Which of the following statements about solids is correct?

Accepted Answer

Solids have a definite volume and shape

Question 10

When water vapor condenses on a cold soda can, what happens to the energy of the water molecules?

Accepted Answer

Energy is removed from the molecules

Question 11

Which of the following is a homogeneous mixture?

Accepted Answer

Apple juice (without pulp)

Question 12

Which property is used to distinguish a chemical property from a physical property?

Accepted Answer

Ability to form a new substance

Question 13

Which of the following changes is NOT a physical change?

Accepted Answer

Burning lamp oil

Question 14

Which statement about compounds is correct?

Accepted Answer

Compounds are composed of atoms of different elements

Question 15

What is the physical state of matter that is compressible and has no definite shape or volume?

Accepted Answer

Gas

Question 16

Which of the following is a sign that a chemical reaction has occurred?

Accepted Answer

Change in color

Question 17

Which of the following is a pure substance?

Accepted Answer

Bromine

Question 18

Which process requires energy to be added to a substance?

Accepted Answer

Melting

Question 19

A block of wood is best classified as:

Accepted Answer

Heterogeneous mixture

Question 20

Which of the following best describes the boiling point of a substance?

Accepted Answer

The temperature at which a liquid turns into a gas

Chapter 3: Energy & Matter – Study Notes for GOB Chemistry

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