Topic 1: Exploring matter

Question 1

What is matter?

Answer 1

Anything that has mass and occupies space

Question 2

What is the particle model of matter? (5 points)

Answer 2

• Matter is made up of extremely small particles
• There are always spaces between particles
• Particles are attracted to each other
• Particles are always moving
• Particles move faster and farther apart when they gain energy

Question 3

What causes matter to change states?

Answer 3

Added energy (Usually thermal energy)

Question 4

What is called when a gas becomes a liquid?

Answer 4

Condensation

Question 5

What is called when a gas becomes a solid?

Answer 5

Deposition

Question 6

What is called when a solid becomes a liquid?

Answer 6

Melting

Question 7

What is called when a solid becomes a gas?

Answer 7

Sublimation

Question 8

What is called when a liquid becomes a gas?

Answer 8

Evaporation

Question 9

What is called when a liquid becomes a solid?

Answer 9

Freezing

Question 10

What is it called when a substance releases energy?

Answer 10

Exothermic

Question 11

What is it called when a substance absorbs energy?

Answer 11

Endothermic

Question 12

What is a mixture?

Answer 12

Contains two different kinds of particles/substances

Question 13

What is a pure substance?

Answer 13

Contains only one kind of particle/substance

Question 14

What are the two main types of mixtures?

Answer 14

Homogeneous
Heterogeneous

Question 15

What are the three types of heterogeneous mixtures?

Answer 15

• Suspension
• Colloid
• Emulsion

Question 16

What is a suspension mixture?

Answer 16

Particles are uniformly mixed, but if left undisturbed they will settle (eg. muddy water)

Question 17

What is a colloid mixture?

Answer 17

Fine particles evenly distributed throughout a substance

Question 18

What is a emulsion mixture?

Answer 18

Liquids are dispersed in liquids, they do not dissolve