Acids and Alkalis

Question 1

What are three commonly used acids?

Answer 1

Hydrochloric acid, Sulphuric acid and Nitric acid.

Question 2

Acids and alkalis can conduct electricity. True/False

Answer 2

True

Question 3

What can acids remove?

Answer 3

Stains.

Question 4

What can alkalis remove?

Answer 4

Grease.

Question 5

What are three commonly used alkalis?

Answer 5

Sodium Hydroxide, Calcium Hydroxide and Ammonia.

Question 6

Does acid or alkali have a slippery feel?

Answer 6

Alkalis.

Question 7

What are the two safety precautions when handling acids and alkalis?

Answer 7

1. Wear safety goggles - protects your eyes
2. Wear gloves - to avoid direct contact with the solutions

Question 8

What should we put the used solutions after any experiment?

Answer 8

Waste bottles.

Question 9

What are the two things we should never do with acids and alkalis?

Answer 9

• Taste the solutions
• Mix the solutions

Question 10

What is a term describing something that have been polluted by chemicals?

Answer 10

Contamination.

Question 11

What are three examples of natural indicators?

Answer 11

Red cabbage, red rose flower and beetroot.

Question 12

Some plants contain ______ which changes colour upon contact with acids or alkalis.

Answer 12

pigments

Question 13

What is blue and red litmus used for?

Answer 13

Blue litmus - acids
Red litmus - alkalis

Question 14

What is the measurement for acidity and alkalinity?

Answer 14

The pH scale.

Question 15

What is the pH of a neutral solution?

Answer 15

7.

Question 16

We can use the ___a___ indicator or ___b___ to obtain the pH value of a solution.

Answer 16

a) universal
b) pH paper

Question 17

What is the name of an electronic device used to measure pH?

Answer 17

pH meter.

Question 18

What are three benefits of using a pH meter?

Answer 18

1. Measurements are more accurate
2. Can be reused
3. Can measure the pH of solutions with a dark colour

Question 19

What is produced in neutralisation?

Answer 19

Salt, water and heat.

Question 20

Mass is ______ in neutralisation reactions.

Answer 20

conserved

Question 21

Acid + Alkali → ___a___ + ___b___

Answer 21

a) salt
b) water

Question 22

What are examples of useful applications of neutralisation?

Answer 22

• Prevent tooth decay
• Relieve stomach ache
• Treat insect stings and bites
• Regulates the pH of soil
• Treat industrial waste containing acid or alkalis

Question 23

Acid + Metal → ___a___ + ___b___

Answer 23

a) salt
b) hydrogen

Question 24

Acid + ___a___ → salt + ___b___ + water

Answer 24

a) carbonate
b) carbon dioxide

Question 25

Marble and Limestone contains…

Answer 25

Calcium carbonate.

Question 26

Acids and Alkalis in ______ form are more corrosive.

Answer 26

concentrated

Question 27

What are examples of strong acids?

Answer 27

Hydrochloric acid, Sulphuric acid and Nitric acid.

Question 28

What are examples of weak acids?

Answer 28

Citric acid, Carbonic acid and ethanol.

Question 29

What are examples of strong alkalis?

Answer 29

Sodium hydroxide and Potassium hydroxide.

Question 30

What is an example of a weak alkali?

Answer 30

Ammonia solution.

Question 31

Why is mixing household cleaners potentially dangerous?

Answer 31

Because they may react to produce toxic vapours that can irritate or corrode our respiratory tract, skin and eyes.

Question 32

What should we do as precautions when we use household cleaners?

Answer 32

Keep the area well ventilated.