chemical reactions and equations

Question 1

combination reaction

Answer 1

2Mg + O2 —> 2MgO
CaO + H2O —> Ca(OH)2
2CO + O2 —> 2CO2

Question 2

thermal decomposition reaction

Answer 2

FeSO4 —> Fe2O3 + SO2 +SO3
CaCO3 —> CaO + CO2

Question 3

electrolysis decomposition reaction

Answer 3

2H2O —> 2H2 + O2

Question 4

photochemical decomposition reaction

Answer 4

2AgBr —> 2Ag + Br2

Question 5

displacement reaction

Answer 5

CuSO4 + Zn —> ZnSO4 + Cu
or Fe instead of Zn

Question 6

double displacement reaction

Answer 6

Na2SO4 + BaCl2 —> 2NaCl + BaSO4

Question 7

precipitation reaction

Answer 7

Na2SO4 + BaCl2 —> 2NaCl + BaSO4
BaSO4 precipitate

Question 8

neutralization reaction

Answer 8

acid + base —> salt + water
HCl + NaOH —> NaCl + H2O

Question 9

exothermic reaction

Answer 9

2Mg + O2 —> 2MgO + energy
CH4 + 2O2 —> CO2 + 2H2O + energy

Question 10

endothermic reaction

Answer 10

CaCO3 —> CaO + CO2
2H2O —> 2H2 + O2
2AgBr —> 2Ag + Br2

Question 11

heat FeSO4

Answer 11

2FeSO4 —> Fe2O3 + SO2 + SO3

Question 12

heat Pb(NO3)2

Answer 12

Pb(NO3)2 —> 2PbO + 4NO2 + O2

Question 13

rusting in iron

Answer 13

2Fe + 3/2 O2 + XH2O —> Fe2O3.XH2O

Question 14

corrosion in copper

Answer 14

2Cu + CO2 + O2 + H2O —> CuCO3.Cu(OH)2

Question 15

corrosion in silver

Answer 15

2Ag + H2S —> Ag2S + H2

Question 16

aluminothermy

Answer 16

Fe2O3 + 2Al —> 2Fe + Al2O3