C4 Chemical Changes

Question 1

What ph is acids on the ph scale

Answer 1

1 - 6

Question 2

What ph is a neutral on the ph scale

Answer 2

7

Question 3

What ph are alkalis on the ph scale

Answer 3

8 - 14

Question 4

What ions does an acid form in water

Answer 4

H+ ions

Question 5

What ions does alkalis form in water

Answer 5

OH- ions

Question 6

What is the neutralisation equation

Answer 6

Acid + base —> salt + water

Question 7

What are the colours for litmus paper

Answer 7

Blue in alkalis and red in acids

Question 8

What are the colours for the phenolphthalein indicator

Answer 8

Pink in alkalis and colourless in acids

Question 9

What are the colours for the methyl orange indicator

Answer 9

Yellow in alkalis and red acids

Question 10

Ionisation of hydrochloric acid

Answer 10

HCl —> H+ + NO3-

Question 11

What is a strong acid

Answer 11

An acid that fully ionises in water for example hydrochloric acid

Question 12

What is a weak acid

Answer 12

An acid that does not fully ionise/partly ionise in water

Question 13

Can a weak acid reaction be reversed

Answer 13

Yes a weak acid reaction is reversible which sets up an equilibrium