EXAM - Air & Burning

Question 1

Nitrogen Percentage In Air

Answer 1

78%

Question 2

Oxygen Percentage In Air

Answer 2

21%

Question 3

Carbon Dioxide Percentage In Air

Answer 3

0.03%

Question 4

Noble Gases Percentage in air

Answer 4

0.97% (MOSTLY ARGON)

Question 5

Water vapour percentage in air

Answer 5

The Amount Varies

Question 6

Where & when did Priestly discover oxygen

Answer 6

Priestley discovered oxygen in 1774

Question 7

What is the test for oxygen

Answer 7

If you add a glowing wood splint then it will relight and if you add a burning splint it will burn better

Question 8

What is a catalyst

Answer 8

A substance that speeds up a chemical reaction without being used up itself

Question 9

What happens when magnesium burns in oxygen

Answer 9

Burns brighter and faster

Question 10

What happens when Sulfur burns in oxygen

Answer 10

Burns better, blue flame is easily seen

Question 11

Magnesium + Oxygen —->

Answer 11

Magnesium Oxide

Question 12

Sulfur + Oxygen –>

Answer 12

Sulfur Dioxide

Question 12

Sulfur + Oxygen –>

Answer 12

Sulfur Dioxide

Question 13

What happens when a lit splint is put into carbon dioxide

Answer 13

It goes out quickly

Question 14

What is the test for carbon dioxide

Answer 14

The test for carbon dioxide is that when it is bubbled through limewater, the limewater will change from colourless to milky

Question 15

Why does magnesium gain mass after being heated

Answer 15

magnesium reacts with oxygen, forming magnesium oxide

Question 16

What is oxidation

Answer 16

When a substance gains oxygen

Question 17

What is an oxide

Answer 17

An oxide is made when a substance gains oxygen