C3 Science

Question 1

What are the three types of substances?

Answer 1

Acid, alkali, neutral

Question 2

Acid and alkali are the _______ of each other.

Answer 2

opposite

Question 3

Where does neutral fall in relation to acid and alkali?

Answer 3

In the middle

Question 5

What happens when we add an indicator to a substance?

Answer 5

The indicator changes colour

Question 6

What can we compare the colour of the indicator to?

Answer 6

A chart

Question 7

What can we determine by comparing the indicator’s colour to a chart?

Answer 7

If the substance is acid, alkali or neutral

Question 8

What is the name of the indicator commonly used?

Answer 8

Universal indicator or pH indicator

Universal indicator is used to determine the acidity or alkalinity of a solution.

Question 9

What is the pH colour of shampoo?

Answer 9

cyan

Shampoo has a pH of 8, indicating it is an alkali.

Question 10

What type of solution is detergent?

Answer 10

alkali

Detergent has a pH of 9 and is represented by the colour blue.

Question 11

What is the pH of cola?

Answer 11

4

Cola is an acidic solution with an orange colour.

Question 12

What is the pH colour of salt water?

Answer 12

green

Salt water has a neutral pH of 7.

Question 13

What is the pH of soap solution?

Answer 13

8

Soap solution is an alkali and has a cyan colour.

Question 14

What type of solution is an indigestion remedy?

Answer 14

alkali

The indigestion remedy has a pH of 10 and is represented by the colour blue.

Question 15

What is the pH colour of disinfectant?

Answer 15

green

Disinfectant has a neutral pH of 7.

Question 16

What is the pH of hydrochloric acid?

Answer 16

1

Hydrochloric acid is an acid with a red colour.

Question 17

What type of solution is sulphuric acid?

Answer 17

acid

Sulphuric acid has a pH of 1 and is also represented by the colour red.

Question 18

What is the pH of sodium hydroxide?

Answer 18

14

Sodium hydroxide is an alkali solution with a purple colour.

Question 19

What is the pH colour of vinegar?

Answer 19

red

Vinegar has a pH of 3, indicating it is an acid.

Question 20

What is the pH of washing powder?

Answer 20

9

Washing powder is an alkali solution and is represented by the colour blue.

Question 21

What is the pH of acids?

Answer 21

Less than 7

Question 22

What is the pH of neutral solutions?

Answer 22

7

Question 23

What is the pH of alkalis?

Answer 23

More than 7

Question 24

What is one acid used in the lab?

Answer 24

Hydrochloric acid

Another lab acid is sulphuric acid.

Question 25

Name two acids commonly found at home.

Answer 25

* Cola * Vinegar ## Footnote These substances are typically acidic.

Question 26

What is one alkali used in the lab?

Answer 26

Sodium Hydroxide ## Footnote This is a common laboratory alkali.

Question 27

Name two alkalis commonly found at home.

Answer 27

* Shampoo * Detergent ## Footnote These are often used in cleaning products.

Question 28

What type of household substance is usually alkaline?

Answer 28

Cleaning product ## Footnote Alkaline substances are often used for cleaning.

Question 29

What type of household substance is usually acidic?

Answer 29

Food ## Footnote Many foods contain acidic properties.