Y7 Revision: Reactions

• Chemistry
• Lower Secondary (Key Stage 3)

Y7 Revision: Reactions

Acid or Alkali?

Acid

Alkali

Stomach acid

Sodium hydroxide

Taste sour

pH < 7

pH > 7

Bleach

Vinegar

Observations

Select one reactant in this equation.

sodium + water → sodium hydroxide + hydrogen

1. sodium hydroxide
2. sodium
3. water
4. hydrogen

Select one product in this equation.

nitric acid + copper oxide → copper nitrate + water

1. nitric acid
2. water
3. copper oxide
4. copper nitrate

What is wrong with this equation?

sodium and oxygen = sodium oxide

Fill in the word equation for methane reacting with oxygen to form carbon dioxide and water.

+

→

+

methane

oxygen

carbon dixode

water

What does this hazard symbol mean?

1. Corrosive
2. Flammable
3. Irritant
4. Toxic

What does this hazard symbol mean?

1. Corrosive
2. Flammable
3. Irritant
4. Toxic

What precautions should we take when handling acids and alkalis?

What colour does red litmus paper turn in an alkali?

1. Red
2. Blue
3. Green
4. Yellow

What colour does universal indicator go in a strong acid?

1. Red
2. Blue
3. Green
4. Yellow

What is the pH of a substance which turns universal indicator green?

1. 0-2
2. 8-11
3. 7
4. 3-6

A substance that has a pH 8-11 is a...

1. strong acid
2. weak acid
3. weak alkali
4. strong alkali

Hydrochloric acid forms a...

1. Nitrate
2. Chloride
3. Sulfate
4. Oxide

Which of these substances is an alkali?

1. Nitric acid
2. Magnesium
3. Calcium chloride
4. Sodium hydroxide

The reaction of an acid and alkali is called...

1. Combustion
2. Displacement
3. Neutralisation
4. Oxidation

Properties of metals

Give a reason that rings are made from metal

1. Malleable
2. High melting point
3. Good thermal conductor
4. Shiny

Give a reason for making wires out of metal.

1. Shiny
2. High melting point
3. Ductile
4. Good electrical conductor