IScience - Chapter 7 Test

Question 1

___ occurs when thermal energy is added to a liquid.

Answer 1

Boiling

Question 2

___ occurs when thermal energy is removed from a liquid.

Answer 2

Freezing

Question 3

___ occurs when thermal energy is added to a solid.

Answer 3

Melting

Question 4

___ occurs when thermal energy is removed from a gas.

Answer 4

Condensing

Question 5

A substance that consists of just one type of atom.

Answer 5

Element

Question 6

Anything that has mass and takes up space.

Answer 6

Matter

Question 7

A small particle that is a building block of matter.

Answer 7

Atom

Question 8

A combination of two or more substances PHYSICALLY blended together.

Answer 8

Mixture

Question 9

Which property is size-independent?
A) Volume
B) Mass
C) Conductivity

Answer 9

C) Conductivity

Question 10

The number of protons in an atom of an element is the element’s ___.

Answer 10

Atomic number

Question 11

Describe the particles of a solid.

Answer 11

Very close together

Question 12

H2O is an example of ___.

Answer 12

A chemical formula

Question 13

\_\_\_ is least likely to be useful in separating the substances in a mixture.
A) Solubility
B) Mass
C) Magnetism
D) Density

Answer 13

B) Mass

Question 14

The phase change that is the reverse of condensation is ___.

Answer 14

Vaporization

Question 15

Which property would vary between two different-sized samples of the same substance?

Answer 15

Volume

Question 16

Which of the following is a heterogeneous mixture?
A) Water in a swimming pool
B) Sugar water
C) Stainless steel
D) A jar of mixed nuts

Answer 16

D) A jar of mixed nuts

Question 17

The phase change in which a substance changes from a solid to a liquid is ___.

Answer 17

Melting

Question 18

Which item is a substance?
A) Muddy water
B) Apple juice
C) Aluminum

Answer 18

C) Aluminum

Question 19

What is the formula used to calculate density?

Answer 19

Density = Mass ÷ Volume

Question 20

A kind of matter that is classified as a solution could also be classified as a ___.

Answer 20

Mixture

Question 21

The individual substances that make up a ___ are not evenly mixed.

Answer 21

Heterogeneous mixture

Question 22

In which state of matter are the forces of attraction so weak that they can be ignored under ordinary conditions?

Answer 22

Gas

Question 23

The phase change in which a substance changes from a liquid to a gas is ___.

Answer 23

Vaporization

Question 24

What physical property would be most useful for separating the substance in a saltwater solution.

Answer 24

Boiling point

Question 25

A chemical formula represents the different ___.

Answer 25

Elements that make up compounds

Question 26

Which state of matter contains particles that move the most quickly?

Answer 26

Gas

Question 27

When matter undergoes a physical change, mass is ___.

Answer 27

always conserved

Question 28

Filtration can be used to separate mixtures based on ___.

Answer 28

The size of their particles (Volume)

Question 29

Dissolving is best described as ___.

Answer 29

Mixing evenly

Question 30

Magnetism is a physical property that could be used to separate a mixture of ___.

Answer 30

Anything and iron

Question 31

Which of the following is a physical change? A) Rust forming on an iron fence. B) Sawing a piece of wood in half. C) Burning a piece of wood. D) A copper roof changing color from red to green.

Answer 31

B) Sawing a piece of wood in half.