Equations

Question 1

ammonium ion

Answer 1

NH4 +

Question 2

Chlorate ion

Answer 2

Clo3-

Question 3

manganate (vII) ion

Answer 3

MnO4 -

Question 4

dichromate (VI) ion

Answer 4

Cr2O7 2-

Question 5

thiosulfate ion

Answer 5

S2O3 2-

Question 6

ethanoate ion

Answer 6

CH3COO -

Question 7

why do chemical equations need to be balanced

Answer 7

no atoms are gained or lost during a chemical reaction

Question 8

metal + oxygen =

Answer 8

metal oxide

Question 9

metal + water =

Answer 9

metal hydroxide + hydrogen

Question 10

metal + steam =

Answer 10

metal oxide + hydrogen

Question 11

metal + acid =

Answer 11

salt + hydrogen

Question 12

acid + alkali =

Answer 12

salt + water

Question 13

acid + base =

Answer 13

salt + water

Question 14

acid + carbonate =

Answer 14

salt + water + carbon dioxide

Question 15

what does a metal carbonate decompose upon heating to give

Answer 15

metal oxide and carbon dioxide

Question 16

what are hydrogencarbonates used in

Answer 16

cooking as a raising agent because it causes bread to rise

Question 17

displacement reaction

Answer 17

a more reactive metal displaces a less reactive metal from one of its salts

Question 18

redox reaction

Answer 18

one species is oxidised and a different species is reduced