Unit 4 Quiz

Question 1

Melting refers to the change in state from a _________ to a _________

Answer 1

solid; liquid

Question 2

Freezing refers to the change in state from a _____ to a _______

Answer 2

liquid; solid

Question 3

Vaporization refers to the change in state from a _______ to a ______

Answer 3

Liquid; gas

Question 4

Condensation refers to the change in state from a ______ to a ______

Answer 4

gas; liquid

Question 5

When solid ice melts to form a liquid, energy is _______

Answer 5

absorbed

Question 6

When liquid water boils to form a gaseous water vapor, energy is _______

Answer 6

absorbed

Question 7

When gaseous water vapor is condensed to form a liquid, energy is. _______

Answer 7

released

Question 8

When liquid water is frozen into solid ice, energy is ______

Answer 8

released

Question 9

the temperature at which a substance melts is ______ as the temperature at which a substance freezes

Answer 9

the same

Question 10

The temperature at which a substance boils is _______ as the temperature at which a substance condenses.

Answer 10

The same

Question 11

What happens to the speed of molecules when energy is added to it?

Answer 11

They move faster as speed increases

Question 12

What happens to the speed of molecules when energy is removed from it?

Answer 12

They move slower, or the speed decreases

Question 13

What is kinetic energy?

Answer 13

Energy of movement

Question 14

What are the signs of a physical reaction?

Answer 14

Change in appearance such as size, shape, change of state.

Question 15

what are signs of a chemical reaction?

Answer 15

A new/ different substance was produced, production of a gas, formation of a precipitate, unexpected color change.