Simple Chemical Reactions

Question 1

{remember Base + Acid = Salt + Water}

What salt is Hydrochloric Acid for?

Answer 1

Chloride

{example: Calcium + Hydrochloric Acid -> Calcium Chloride + Water}

Question 2

What do you get when you mix Carbon and Oxygen?

Answer 2

Carbon + Oxygen -> Carbonoxide

Question 3

Is burning coal in a fire a chemical or physical change?

Answer 3

Chemical

Question 4

What is the most important result of a chemical change?

Answer 4

a NEW substance is made

Question 6

What do you get when you mix Magnesium and Oxygen?

Answer 6

Magnesium + Oxygen -> Magnesium Oxide

Question 9

What do you get when you mix Aluminium and Oxygen?

Answer 9

Aluminium + Oxygen -> Magnesium Oxide

Question 10

{remember Base + Acid = Salt + Water}

What salt is Nitric acid for?

Answer 10

Nitrate

{example: Zinc + Nitric Acid -> Zinc Nitrate + Water}

Question 11

Is adding salt to water a chemical or physical change?

Answer 11

Physical

Question 12

Are physical changes reversible or irreversible?

Answer 12

Physical changes do not make a new substance so van be reversed easily, it is irreversible.

Question 13

Is burning a candle a chemical or physical change?

Answer 13

Chemical

Question 14

{remember Base + Acid = Salt + Water}

What salt is Sulphuric acid for?

Answer 14

Sulphate

Question 15

Is making an ice lolly a chemical or physical change?

Answer 15

Physical

Question 16

What do you get when you mix Sulphur and Oxygen?

Answer 16

Sulphur + Oxygen -> Sulphur Oxide

Question 17

Is making wine a chemical or physical change?

Answer 17

Chemical

Question 20

Is burning a sparkler a chemical or physical change?

Answer 20

Chemical

Question 22

What do you get when you mix Ethanol and Oxygen?

Answer 22

Ethanol + Oxygen -> Carbon Dioxide + Water

Question 24

Are chemical changes reversible or irreversible?

Answer 24

They make new substances so can’t be reversed, so they are irreversible.

Question 26

Is frying an egg a chemical or physical change?

Answer 26

Chemical

Question 29

What do you get when you mix Calcium and Oxygen?

Answer 29

Calcium + Oxygen -> Calcium Oxide

Question 30

Is adding sugar to water a chemical or physical change?

Answer 30

Physical

Question 32

What is a fuel?

Answer 32

A fuel is a substance that releases energy when burnt in air and oxygen

Question 33

How do you test for carbon dioxide?

Answer 33

Do the limewater test - if positive the limewater will go cloudy/milky

Question 34

What do you get when you mix Iron and Oxygen?

Answer 34

Iron + Oxygen -> Ironoxide

Question 35

What are the chemical equations for Methane, Ethanol and Candle Wax?

What do they all contain?

Answer 35

Methane = CH4
Ethanol = C2H6O
Candle Wax = C25H52

They all contain carbon.

Question 36

What three things are needed for something to burn and how can we remove them?

Answer 36

Heat - Water
Fuel - Moving the fuel away from the heat
Oxygen - Blanket

Question 39

Name five examples of chemical changes that may take place in a reaction

Answer 39

All below are acceptable:

• fizzing
• bubbling
• exploding
• temperature change
• colour change
• smell change

Question 42

What is the Pop Test?

Answer 42

The Pop test is where you put a lit splint in to hydrogen {possibly to test for Acid?}

Question 45

Name three processes that you see a chemical change in

Answer 45

All below are acceptable:

• wood burning to ash
• metal rusting on a gate
• bike rusting
• toast burning

Question 47

What do you get when you mix Copper and Oxygen?

Answer 47

Copper + Oxygen -> Copperoxide

Question 49

What is the chemical equation of MASH

Answer 49

MASH = Metal + Acid –> {makes} Salt + Hydrogen