Rections

Question 0

What are the physical properties of oxygen?

Answer 0

Colourless
Odourless
Gas

Question 1

What is the composition of air?

Answer 1

Oxygen - 21%
Nitrogen - 78%
Argon - 0.9%
CO2 - 0.37%

Question 2

What is the word equation for respiration?

Answer 2

Sugar + Oxygen -> Carbon Dioxide + Water(+Energy)

Question 3

What is the chemical test for water?

Answer 3

Use the chemical anhydrous copper sulfate which changes colour from white to blue in prescience of water

Question 4

What is combustion?

Answer 4

When a fuel reacts with oxygen to release energy

Question 5

What are the uses of oxygen?

Answer 5

Welding torches
Breathing apparatus in hospitals
Rocket fuel

Question 6

What is the word equation for the preparation of oxygen?

Answer 6

Manganese dioxide

Hydrogen peroxide -> water + oxygen

Question 7

What chemicals are required for the preparation of oxygen?

Answer 7

Hydrogen peroxide 
Manganese dioxide (catalyst)

Question 8

What is the test for oxygen?

Answer 8

Relights a glowing splint

Question 9

What is a catalyst?

Answer 9

A chemical which speeds up reaction with out being used up itself

Question 10

What are 3 examples of an industrial catalyst?

Answer 10

Iron
Platinum
Vanadium oxide

Question 11

What are enzymes?

Answer 11

Soluble protein molecules that can speed up chemical reactions in cells

Question 12

What chemical reactions are enzymes involved in?

Answer 12

DNA replication
Protein synthesis
Digestion

Question 13

What are the uses of hydrogen?

Answer 13

Making margarine
Clean fuel
Rocket fuel

Question 14

What is the equation for hydrogen?

Answer 14

Magnesium + hydrochloric acid -> magnesium chloride + hydrogen

Question 15

What chemicals are required in the preparation of hydrogen?

Answer 15

Magnesium

Hydrochloric acid

Question 16

What is the test for hydrogen?

Answer 16

Using a lighted splint you will hear a squeaky pop

Question 16

What are the uses of carbon dioxide?

Answer 16

Fizzy drinks
Fire extinguisher
Dry ice

Question 17

What is the equation for carbon dioxide?

Answer 17

Calcium carbonate + hydrochloric acid -> calcium chloride + water + carbon dioxide

Question 18

What chemicals are required for the preparation of carbon dioxide?

Answer 18

Calcium carbonate

Hydrochloric acid

Question 18

What is the test for carbon dioxide?

Answer 18

Turns limewater milky

Question 19

What are two observations when calcium carbonate is added to hydrochloric acid?

Answer 19

Bubble of gas

Metal carbonate disappears to give a clear solution

Question 20

What are two physical properties of carbon dioxide?

Answer 20

Colourless

Gas

Question 21

What is an exothermic reaction?

Answer 21

Gives out heat

Question 22

What is an endothermic reaction?

Answer 22

Takes in heat

Question 23

What is oxidation?

Answer 23

Occurs when a chemical reacts with oxygen

Question 24

What is reduction?

Answer 24

The opposite of oxidation and occurs when a substance looses oxygen

Question 25

What is a redox reaction?

Answer 25

When REDUCTION and OXIDATION take place together.

Question 26

What colour is copper?

Answer 26

Black

Question 28

What colour is copper oxide?

Answer 28

Black

Question 29

What is thermal decomposition?

Answer 29

The breaking down of a chemical using heat

Question 30

What is a reducing agent?

Answer 30

Substance that reduces another substance