Changes of state

Question 1

What is it called when gas changes into a liquid?

Answer 1

Condensation

Question 2

What is it called when liquid changes into a solid?

Answer 2

Freezing

Question 3

What is it called when solid changes into a liquid?

Answer 3

Melting

Question 4

What is it called when gas changes into a solid?

Answer 4

Deposition

Question 5

What is it called when solid changes into a gas?

Answer 5

Sublimation

Question 6

What is it called when liquid changes into a gas?

Answer 6

Evaporation

Question 7

What is required for matter to change state?

Answer 7

It’s particles must gain or lose energy. For example, adding energy in the form of heat to a solid can make it change state, forming a liquid.

Question 8

Melting and evaporation are processes that require (heating / cooling)?

Answer 8

heating

Question 9

Condensation and freezing are processes that require (heating / cooling)?

Answer 9

cooling

Question 10

Melting involves changing a ___ to a _____.

Answer 10

solid, liquid

Question 11

What causes solids to be rigid and maintain their shape?

Answer 11

Particles are very close and have very strong attractive forces between them.

Question 12

When a solid is HEATED, the particles gain _____ energy, which causes them to vibrate faster.

Answer 12

kinetic

Question 13

When enough energy is exposed to a solid, the particles will…?

Answer 13

Gain enough energy break the strong attractive forces between them. The particles will begin the move more freely and further apart from one another, forming a liquid.

Question 14

What is the temperature, at which a substance changes to a liquid called?

Answer 14

The melting point.

Question 15

Evaporation causes a ____ to to turn into a _____.

Answer 15

liquid, gas

Question 16

When particles in a liquid gain enough energy, they…?

Answer 16

Have enough energy to escape from the surface of the liquid in a gaseous state.

Question 17

______ particles have the most kinetic energy.

Answer 17

Gas

Question 18

Evaporation only takes place…?

Answer 18

On the surface of the liquid.

Question 19

Condensation involves a _____ turning into a _____.

Answer 19

gas, liquid

Question 20

What happens when gas particles are cooled?

Answer 20

They lose kinetic energy, and as a result, they slow down and move closer together, forming a liquid.

Question 21

When condensation occurs, the forces of attraction between particles…?

Answer 21

Strengthen to form a liquid. Heat is lost to its surroundings.

Question 22

Freezing involves a ____ changing to a ____.

Answer 22

liquid, solid

Question 23

What happens to particles in a liquid when cooled?

Answer 23

The particles lose more kinetic energy. The particles slow down and move closer together as the forces of attraction between them strengthens to form a solid.