Chemistry

Question 1

What is the process in which ice changes to water

Answer 1

Melting

Question 2

What is the process in which water changes to ice

Answer 2

Freezing

Question 3

What does the arrow mean in (reactants ———-> products)

Answer 3

Changes to or forms

Question 4

Process in which water changes to steam

Answer 4

Evaporation

Question 5

Process in which steam changes to water

Answer 5

Condensation

Question 6

What is a chemical change and give two examples

Answer 6

A chemical change is an irreversible change, for example baking a cake or making toast

Question 7

What is a physical change and give two examples

Answer 7

A physical change is reversible , for example , water freezing and ice melting

Question 8

What does copper carbonate look like before and after heating ?

Answer 8

Before- green solid After- black solid

Question 9

What is the equation for burning magnesium in air?

Answer 9

Magnesium + Oxygen -> Magnesium Oxide

Question 10

The process of a solid changing to a gas is?

Answer 10

Sublimation

Question 11

What does a fire need to burn

Answer 11

Heat, fuel , oxygen