S1 Awesome Acids

Question 1

What are 2 indicators we can use to tell the difference between acids and alkalis?

Answer 1

Universal indicator

pH paper

Question 2

What colour does pH indicator turn for acids?

Answer 2

Red

Question 3

What colour does pH indicator turn for neutral solutions?

Answer 3

Green

Question 4

What colour does pH indicator turn for alkalis?

Answer 4

Purple

Question 5

What number on the pH scale represents a neutral solution?

Answer 5

7

Question 6

What numbers on the pH scale represent acids?

Answer 6

1, 2, 3, 4, 5, 6

Question 7

What numbers on the pH scale represent alkalis?

Answer 7

8, 9, 10, 11, 12, 13, 14

Question 8

Cleaning products are usually which type of solution?

Answer 8

Alkali

Question 9

Fizzy drinks and fruit juices are what type of solution?

Answer 9

Acid

Question 10

What happens to the pH of an alkali when we add acid to it?

Answer 10

It decreases (towards 7)

Question 11

What happens to the pH of an acid when we add alkali to it?

Answer 11

It increases (towards 7)

Question 12

What is the name of the type of reaction that occurs when we combine an acid and an alkali?

Answer 12

Neutralisation

Question 13

What products are made when an acid neutralises an alkali?

Answer 13

Water and salt

Question 14

Are wasp stings acidic or alkaline?

Answer 14

Alkaline

Question 15

What household substance do we use to treat a wasp sting?

Answer 15

Vinegar (an acid)

Question 16

Are bee stings acidic or alkaline?

Answer 16

Acidic

Question 17

What household substance do we use to treat a bee sting?

Answer 17

Sodium bicarbonate (an alkali)

This is also called baking soda

Question 18

Is toothpaste acidic or alkaline?

Answer 18

Alkaline

Question 19

In terms of acids and alkalis, explain how toothpaste prevents tooth decay.

Answer 19

Acids left on the teeth cause tooth decay. Using toothpaste neutralises the acids.

Question 20

Which substance is used to treat acidic soil?

Answer 20

Lime