LEARN!!!!

Question 1

Halide reducing power Cl- ion

Answer 1

Produce: HCl

> NaCl + H2SO4 -> NaHSO4 + HCl -steamy fumes

Question 2

Halide reducing power Br- ions

Answer 2

Produce: HBr, Br2 and SO2

> NaBr + H2SO4 -> NaHSO4 = HBr - steamy fumes
2Br- + H2SO4 + 2H+ -> Br2 + SO2 + 2H2O- brown fumes and choking gas

Question 3

Halide reducing power I- ions

Answer 3

Produce: HI, I2, SO2, S and H2S

> NaI + H2SO4 -> NaHSO4 + HI - steamy fumes
2I- + H2SO4 + 2H+ -> I2 + SO2 + 2H2O - purple fumes and choking gas
6I- + H2SO4 + 6H+ -> 3I2 + S + 4H2O- yellow solid
8I- + H2SO4 + 8H+ -> 4I2 + H2S + 4H2O- bad egg smell

Question 4

Give the equations and conditions used for the reduction of Iron oxide by carbon in the blast furnace.

Answer 4

C(s) + O2 (g) -> CO2(g)
CO2(g) + C -> 2CO(g)
Fe2O3(s) +3CO(g) -> 2Fe(l) +3CO2(g)
2000K

Question 5

Give the symbol equations for the extraction of copper from CuCO3

Answer 5

CuCO3(s) -> CuO(s) + CO2(g)

then

2CuO(s) + C(S) -> 2Cu(l) + CO2 (g)

Question 6

Give an ionic equation for the reduction of copper ions using scrap iron.

Answer 6

Cu2+(aq) + Fe(s) -> Cu(s) + Fe2+(aq)

Question 7

Write a symbol equation for the extraction of manganese using carbon, including the changes in oxidation states.

Answer 7

MnO2(s) + C(s) -> Mn(s) + CO2(g)

+4 -2 0 0 +4 -2

Question 8

Give the electrode equations for the extraction of aluminium from Al2O3?

Answer 8

Negative electrode Al3+ + 6e- -> 2Al
Positive electrode 3O2 -> 1.5O2 + 6e-

Overall: Al2O3 -> 2Al + 1.5O2

Question 9

Give the equation, conditions and risk associated with the extraction of WO3 by reduction with hydrogen.

Answer 9

WO3 + 3H2 -> W + 3H2O
Conditions: High temperature
Risk: Hydrogen is a flammable gas.

Question 10

Give an equation for the conversion of titanium (IV) oxide to titanium (IV) chloride.

Answer 10

TiO2(s) + 2C(s) + 2Cl2(g) -> TiCl4(l) + 2CO(g)

Question 11

Give the equation for the reduction of titanium (IV) chloride with sodium.

Answer 11

TiCl4(l) + 4Na(l) -> Ti(l) + 4NaCl(l)

Question 12

simplest ionic equation for acidified barium chloride ans sulfate ions and what would be the observation

Answer 12

Ba 2+ + SO4 2- -> BaSO4

> white ppt

Question 13

reaction of Chlorine with water

Answer 13

Cl2 + H2O -> HClO + HCl

Question 14

reaction of chlorine and sunlight

Answer 14

2Cl2 + 2H2O -> 4HCl + O2

Question 15

NaClO with water

Answer 15

NaClO + H2O -> Na+ + OH- + HClO