Chemical changes

Question 1

what ion is produced by all alkalis in aqueous solutions

Answer 1

OH- / hydroxide ion

Question 2

what is the pH of a neutral solution

Answer 2

7

Question 3

true or false
alkalis have a pH of more than 7

Answer 3

True

Question 4

which type of reaction occurs when hydrochloric acid reacts with potassium hydroxide.
what are the products of this reaction

Answer 4

a neutralisation reaction.
an acid (HCl) reacts with a base (KOH)
acid-base neutralisation reactions always produce a salt and water
so the products are potassium chloride (KCl) and water (H2O)

Question 5

true or false
bases that are insoluble in water do not take part in neutralisation reactions with acids

Answer 5

false
insoluble bases react in neutralisation reactions if added to acids

Question 6

what are the products when an acid reacts with a metal hydroxide

Answer 6

a salt + water

Question 7

give the names of the ions that are produced by the breakdown of water molecules

Answer 7

hydrogen / H+ and hydroxide / OH- ions

Question 8

what can be used as inert electrodes in electrolysis experiments

Answer 8

graphite

Question 9

what is the product at the cathode in the electrolysis of aqueous magnesium sulfate

Answer 9

hydrogen gas / H2 will be produced as magnesium is more reactive than hydrogen