Acids And Bases

Question 0

What is a base

Answer 0

A base is a substance that causes red litmus paper to turn blue

Question 1

What is an acid

Answer 1

An acid is a substance that causes blue litmus paper to turn red

Question 2

Name three everyday acids

Answer 2

Lemon juice, rain water and vinegar

Question 3

Name two lab acids

Answer 3

Hydrochloric acid and sulphuric acid

Question 4

Name three everyday bases

Answer 4

Toothpaste, bleach and indigestion tablets

Question 5

Name three lab bases

Answer 5

Sodium hydroxide, calcium carbonate and limewater

Question 6

What is the PH scale

Answer 6

• a scale which runs from one to ten
• indicates the level of basicity of a substance
• neutral solutions gave a PH if seven
• acids have a PH of less than seven
• bases have a PH of greater than seven
  (Water is neutral)

Question 7

What is an indicator

Answer 7

An indicator is a chemical which shows by means of a colour change, whether a substance is an acid or a base Eg. Litmus paper, universal indicator

Question 8

What is neutralisation

Answer 8

Neutralisation is when an acid and a base react together and neutralise each other to form a salt and water

Question 9

What does fire need to exist (fire triangle)

Answer 9

Heat, fuel and oxygen

Question 10

What are fossil fuels

Answer 10

Fossil fuels are the remains of plants and animals that lived millions of years ago

Question 11

What are fossil fuels made of

Answer 11

Fossil fuels are made of hydrogen and carbon

Question 12

What do fossil fuels produce when burnt

Answer 12

Water vapour and carbon dioxide