Particles

Question 1

What is the process from a substance going from a solid to a liquid called?

Answer 1

melting

Question 2

What is the process from a substance going from a liquid to a gas called?

Answer 2

evaporation

Question 3

What is the process from a substance going from a liquid to a solid called?

Answer 3

freezing

Question 4

What is the process from a substance going from a gas to a liquid called?

Answer 4

condensing

Question 5

What is the process from a substance going from a solid to a gas called?

Answer 5

sublimation

Question 6

What is the process from a substance going from a gas to a solid called?

Answer 6

depositing

Question 7

Describe the movement, forces and density in solids liquids and gases

Answer 7

solids → vibrating, strong forces and high density
liquids → sliding over each other, strong forces and high density
gases → moving in straight lines, weak forces and low density

Question 8

Define atom

Answer 8

smallest unit of matter which retains its properties

Question 9

Define molecule

Answer 9

a small group of atoms

Question 10

Define ion

Answer 10

charges atoms / molecules

Question 11

Define element

Answer 11

a substance made up of the same type of particles

Question 12

Define compound

Answer 12

a substance made up of 2 or more different types particles that are chemically bonded

Question 13

Define mixture

Answer 13

a substance made up of 2 or more different types particles that are not chemically bonded

Question 14

Name 3 physical changes and 2 characteristics of these

Answer 14

• changes of state
• dissolving
• arrangement change
  characteristics:
• reversibile
• no new substances formed

Question 15

Name 3 chemical changes and 2 characteristics of these

Answer 15

• combustion
• neutralisation
• oxidation
• decomposition
• precipitation
  characteristics:
• irreversibile
• new substances formed