Chemistry - topic 2

Question 1

What is an acid?

Answer 1

A substance which produces more H+ ions than OH- ions when dissolved in water

Question 2

What is an alkali?

Answer 2

A substance which produces more OH- ions than H+ ions when dissolved in water

Question 3

What is a neutral substance?

Answer 3

A substance which is neither acidic or alkali and has a pH of 7.

Question 4

What colour will litmus paper turn if the solution is acidic?
Alkali?
Neutral?

Answer 4

Acid - red
Neutral - purple
Alkaline - blue

Question 5

What colour will methyl orange turn if the solution is acidic?
Alkali?
Neutral?

Answer 5

Acid - red
Alkali - yellow
Neutral - yellow

Question 6

What colour will phenolphthalein turn turn if the solution is acidic?
Alkali?
Neutral?

Answer 6

Acid - colourless
Alkali - pink
Neutral - colourless

Question 7

What Is universal indicator?

Answer 7

A chemical solution that produces many different colour changes corresponding to different pH levels