Reversible changes, water and carbon dioxide

Question 1

acid + carbonate

Answer 1

salt + water + carbon dioxide

Question 2

What is a reversible reaction

Answer 2

a reaction in which the conversion of reactants to products and the conversion of products to reactants can both occur

Question 3

Effects of heat and water on hydrated and anhydrous copper (II) sulphate

Answer 3

Hydrated = water is present
Anhydrous = water is not present

Hydrated copper sulphate –(ENDOTHERMIC)–> Anhydrous copper (II) sulphate + water
– White coloured product

Anhydrous copper (II) sulphate + water –(EXOTHERMIC) –> Hydrated copper sulphate
–blue coloured product
– water must be present for the reaction to take place

Question 4

What is endothermic and exothermic?

Answer 4

Endothermic = required het energy from surroundings to work

Exothermic = a reaction in which energy is released in the form of light or heat into surroundings.

Question 5

Effects of heat and water on cobalt (II) chloride

Answer 5

water will turn anhydrous cobalt chloride from BLUE to PINK