Chemical changes and energies

Question 1

Mnemonic to try remember reactivity series

Answer 1

Please stop calling me a careless zebra instead try learning how copper saves gold

Question 2

What colour is copper sulphate

Answer 2

blue

Question 3

What colour is copper

Answer 3

bronze

Question 4

What is Reduction

Answer 4

the gaining of electrons

Question 5

What is Oxidation

Answer 5

the loss of electrons

Question 6

What is the Mnemonic for REDOX reactions

Answer 6

oil rig

Question 7

What happens with a metal with an acid

Answer 7

salt and hydrogen

Question 8

what happens to Alkaline and basses in water

Answer 8

Alkaline dissolve in water bases do not dissolve in water

Question 9

what happens acid and base

Answer 9

salt + water

Question 10

Equation for the reaction between copper (II) oxide and dilute sulfuric acid

Answer 10

CuO (s) + H 2 SO 4 (aq) CuSO 4 (aq) + H 2 O (l)

Question 11

what happens when acids react with metal carbonates. ?

Answer 11

A salt, water and carbon dioxide are produced
carbonate → salt + water + carbon dioxide

Question 12

Endothermic reactions

Answer 12

Endothermic reactions take in energy and the temperature of the surroundings decreases.
Bond breaking = energy in

Question 13

Exothermic

Answer 13

Exothermic reactions transfer energy to the surroundings and the temperature of the surroundings increases.
Bond making = energy out

Question 14

Burning hydrogen in oxygen will give water calculate the energy change for this reaction

Answer 14

Question 15

What is going to happen in this explain
You need a periodic table

Answer 15

Zinc gives up 2 electrons copper is going to accept 2 electrons

Question 16

Difference between a battery and rechargeable battery

Answer 16

Battery - once the reactants are used up the battery is dead
Rechargeable battery - their is a reversable reaction that goes on so once the reactants are used up you can pass electricity through the battery will cause the reactants to go on the reverse direction recharging the reactants

Question 17

What are the advantages and disadvantages of a hydrogen fuel cell what’s the formula

Answer 17