Topic C4 - Chemical changes acids, bases and salts ( metal reactivity and electrolysis )

Question 1

Define a acid

Answer 1

An aqueous solution which has a PH less than 7.

Question 2

What can a base be used for ?

Answer 2

To neutralise an acid

Question 3

What is a neutralisation reaction ?

Answer 3

When an acid and an alkali react together to form water

Question 4

What are the molecules in a strong acid ?

Answer 4

All molecules will ionise - this produces lots of H + ions

Question 5

What are the molecules like in a weak acid ?

Answer 5

Only some of the molecules will ionise - this will produce less H + ions

Question 6

Define alkais

Answer 6

Metal hydroxides that dissolve in water

Question 7

Acid + base =

Answer 7

Salt + water

Question 8

Example equation of a acid + base

Answer 8

Sodium hydroxide + Hydrochloric acid = sodium chloride + water

Question 9

Acid + carbonate =

Answer 9

Salt + water + carbon dioxide

Question 10

Acid + metal =

Answer 10

salt + hydrogen

Question 11

What is oxidation ?

Answer 11

The loss of electrons

Question 12

What is reduction ?

Answer 12

The gain of electrons

Question 13

What is a displacement reaction ?

Answer 13

When a substance has reacted with a compound of another substance to see which one will steel the spectror ion

Question 14

What is at the top of the reactivity series ?

Answer 14

potassium

Question 15

What is the least reactive element on the reactivity series ?

Answer 15

platinum

Question 16

What is electrolysis ?

Answer 16

The process of splitting a substance , either molten or in a solution by the passage of an electric current

Question 17

What is a electrode ?

Answer 17

Positive or negative terminals put into the solution

Question 18

Define an ion

Answer 18

Charged atom or particle

Question 19

What is an anode ?

Answer 19

positive electrode

Question 20

What is an cathode ?

Answer 20

Negative electrode