Chemistry- Reactions

Question 1

Three physical properties of oxygen are;

Answer 1

Colourless
Odourless
Gas

Question 2

What percentage of air is made up of Nitrogen?

Answer 2

78%

Question 3

What is the teat for Oxygen?

Answer 3

A glowing splint relights

Question 4

What is a catalyst?

Answer 4

A catalyst is a chemical that speeds up a reaction without being used up itself.

Question 5

Give two examples of industrial catalysts;

Answer 5

Iron
Vanadium oxide
Platinum

Question 6

What is the test for Hydrogen?

Answer 6

The test for Hydrogen is when a lighted splint makes a squeaky pop noise

Question 7

What is the test for carbon dioxide?

Answer 7

When carbon dioxide is bubbled through lime water it turns the lime water milky and cloudy.

Question 8

List three uses for carbon dioxide;

Answer 8

Fizzy drinks
Dry ice
Fire extinguisher

Question 9

Give two physical properties of carbon dioxide;

Answer 9

Gas
Colourless
Odourless

Question 10

What does endothermic mean?

Answer 10

Take in heat

Question 11

Give an example of something that is endothermic;

Answer 11

Sherbet
Cool pak
(Anything that takes in heat)

Question 12

What does exothermic mean?

Answer 12

Give out heat

Question 13

Give an example of something that is exothermic

Answer 13

Burning piece of wood

Anything that gives off heat

Question 14

What is oxidation?

Answer 14

Oxidation is the addition of oxygen

Question 15

What is Reduction?

Answer 15

Removal of oxygen

Question 16

What is a redox reaction?

Answer 16

Reduction and oxidation both taking place in reaction