C5

Question 1

Oxidation means

Answer 1

Oxygen added

Question 2

Reduction means

Answer 2

Oxygen removed

Question 3

Half equation to show two electrons gained by copper (II)

Answer 3

Cu2+ (aq) + 2e- —> Cu(s

Question 4

Genereal equation for a metal and an acid

Answer 4

Metal + Acid —> salt + hydrogen

Question 5

General equation for insoluble bases

Answer 5

Acid + bade –> salt + water

Question 6

Acids + carbonates

Answer 6

Acid + carbonate —-> salt + water + carbon dioxide

Question 7

What are bases

Answer 7

Substances that can neutrlise acids. For eg: metal oxides, metal hydroxides

Question 8

Examples of acids

Answer 8

Citric acid, sulfuric acid, ethanoic acid (in vinegar)

Question 9

What does 0 show in the Ph scale

Answer 9

Most acidic

Question 10

What does 14 show in the Ph scale

Answer 10

Most alkaline

Question 11

What soltuion can you add in to find the Ph of a substance

Answer 11

Universal indicator

Question 12

Examples of strong acids

Answer 12

HCL, Nitric acid, Sulfuric acid

Question 13

Examples of weak acids

Answer 13

Ethanoic acids, citric acids, carbonic acids

Question 14

What factor does H+ ions decrease of for every 1 pH factor

Answer 14

By 10

Question 15

What is the Conc of h+ ions with a Ph value of 1

Answer 15

0.10

Question 16

What is the conc of h+ of 2 pH

Answer 16

0.010

Question 17

What is the conc of h+ ion when pH is 3

Answer 17

0.0010