4. Chemical Changes (reactions of acids with metals and neutralisation of acids and salt production)

Question 1

What does an acid + metal produce?

Answer 1

acid + metal -> salt + hydrogen

Question 2

What are acid + metal reactions called?

Answer 2

Redox reactions

Question 3

What does a redox reaction mean?

Answer 3

One substance is reduced (gains electrons) and another substance is oxidised (loses electrons)

Question 4

If electrons are transferred, what kind of reaction is it?

Answer 4

A redox reaction

Question 5

What are displacement reactions?

Answer 5

Redox reactions

Question 6

What are acids neutralised by to produce salts, water and carbon dioxide?

Answer 6

metal carbonates

Question 7

What does an acid + metal carbonate produce?

Answer 7

acid + metal carbonate -> salt + water + carbon dioxide

Question 8

What does the salt produced in any reaction between an acid and base or alkali depend on?

Answer 8

• the acid used
• the positive ions in the base, alkali or carbonate i.e. the metal

Question 9

What does hydrochloric acid + alkali/base produce?

Answer 9

Chlorides

Question 10

What does nitric acid + alkali/base produce?

Answer 10

nitrates

Question 11

What does sulfuric acid + alkali/base produce?

Answer 11

sulfates

Question 12

What must the charges on the positive ion from the
base/alkali/carbonate and the negative ion from the acid add up to?

Answer 12

they must add up to zero

Question 13

When any fuel burns, what is produced?

Answer 13

carbon dioxide and water

Question 14

What does acid + alkali produce?

Answer 14

salt + water