Acids and alkalis

Question 1

Property of acid (not the sour one)

Answer 1

Acids dissolve in water to form solutions which conduct electricity

Question 2

Sulfuric acid+Calcium

Answer 2

Calcium sulfate+Hydrogen gas

Question 3

Nitric acid +Sodium carbonate

Answer 3

Sodium nitrate + Carbon dioxide +Water

Question 4

Hydrochloric acid +Potassium hydroxide

Answer 4

Potassium chloride + Water

Question 5

What do acids form when they react with magnesium?

Answer 5

Salt and hydrogen gas

Question 6

What is a strong acid?

Answer 6

An acid that easily/completely ionise in water.

Question 7

What is a weak acid?

Answer 7

An acid that only partially ionise in water

Question 8

What do alkali produce when they are dissolved in water?

Answer 8

Hydroxide ions

Question 9

Two properties of alkalis

Answer 9

Have a bitter taste, turns moist red litmus paper into red

Question 10

Sodium hydroxide + Hydrochloric acid

Answer 10

Sodium chloride + Water

Question 11

Uses of alkalis
Calcium hydroxide
Aqueous ammonia

Answer 11

Used to reduce acidity in soil.Soil that is too acidic will cause crops to die.

Used to make fertilisers

Question 12

What do they represent in the pH scale?
0 to 1
5 to 6
7
8 to 9
13 to 14

Answer 12

Strong acid
Weak acid
Neutral
Weak alkali
Strong alkali

Question 13

What do they represent in the universal indicator?
0
1 to 2
4 to 5
6 to 8
9 to 11
12 to 14

Answer 13

Red
Orange
Yellow
Green
Blue
Purple