Acids and Alkali

Question 1

What is an acid?

Answer 1

A substance with a pH below 7

Question 2

What is a base?

Answer 2

A substance with a pH above 7

Question 3

What is an alkali?

Answer 3

A soluble base

Question 4

What is a neutral solution?

Answer 4

A solution with a pH of 7

Question 5

What are the four different indicators?
(At GCSE lvl)

Answer 5

Litmus paper, Phenolphalein, Methyl Orange, Universal Indicator

Question 6

What is the colour of Litmus paper in acid?

Answer 6

Red

Question 7

What is the colour of Litmus paper in alkali?

Answer 7

Blue

Question 8

What is the colour of Phenolphalein in acid?

Answer 8

Colourless

Question 9

What is the colour of Phenolphalein in alkali?

Answer 9

Purple

Question 10

What is the colour of Methyl orange in acid?

Answer 10

Red

Question 11

What is the colour of Methyl orange in alkali?

Answer 11

Orange

Question 12

What is the colour of Universal Indicator in acid?

Answer 12

Red

Question 13

What is the colour of Universal Indicator in Alkali?

Answer 13

Purple

Question 14

Dissociation

Answer 14

The splitting up of atoms(ions)
(HCl –> H+ + Cl-

Question 15

Strong acid

Answer 15

An acid that fully dissociates its ions

Question 16

Weak acid

Answer 16

An acid that partially dissociates its ions

Question 17

What is the equation for concentration?

Answer 17

amount dissolved/ volume of solution

Question 18

Acid + Alkali

Answer 18

Salt + Water

Question 19

Acid + Base

Answer 19

Salt + Water

Question 20

Acid + Carbonate

Answer 20

Salt + Water + Carbon dioxide

Question 21

Acid + Metal

Answer 21

Salt + Hydrogen

Question 22

Acid + Metal hydroxide

Answer 22

Salt + Water

Question 23

Acid + Metal oxide

Answer 23

Salt + Water

Question 24

Neutralisation reaction

Answer 24

A reaction between an acid and an alkali to form salt and water

Question 25

Limewater test

Answer 25

The chemical test for carbon dioxide

Question 26

Splint/ squeaky pop test

Answer 26

The chemical test for hydrogen