Defenitions

Question 1

Salt

Answer 1

A compound in which the H plus ions from an acid are replaced by metal ions

Question 2

Hydrated salt

Answer 2

It has water of crystallisation
Water trapped inside the crystals

Question 3

Anhydrous salt

Answer 3

Has no water of crystallisation

Question 4

Exothermic reaction

Answer 4

Releases heat energy to the surroundings

Question 5

Endothermic reaction

Answer 5

Absorbs heat energy from the surroundings

Question 6

Anhydrous copper sulphate colour change when water is added

Answer 6

White to blue

Question 7

Anhydrous cobalt, chloride colour change when water is added

Answer 7

Blue to pink

Question 8

These reactions cannot be used to test for the purity of water, because

Answer 8

The anhydrous salt change colour if water is present, but not of other things are also present

Question 9

Which direction is endothermic? How can you tell?

Answer 9

Hydrated to anhydrous

Question 10

Which direction was exothermic? How do you tell?

Answer 10

anhydrous to hydrated
Heat released