Instruction
A) Balance the following reactions (10marks):
- LiCl + Ag2SO4 -> Li2SO4 + AgCl
- Au2O3 + HNO3 -> Au(NO3)3 + H2O
- Mg(OH)2 + Na2CO3 -> MgCO3 + NaOH
- C3H8 + O2 -> CO2 + H2O
- Fe2O3 + HNO3 -> Fe(NO3)3 + H2O
Na2SO4 + C Na2S + CO
HCl + O2 H2O + Cl2
PCl5 + H2O H3PO4 + HCl
PbO + NH3 Pb + N2 + H2O
Mg3N2 + H2O Mg(OH)2 + NH3
C) Complete and Balance the following reaction equations (10marks):
a- Na2CO3 + H2SO4 Sodium sulphate and Carbon Dioxide + Water
b- HCl + PbO2 Lead Chloride and water
c- PCl5 + SnO2 Tin(IV) Chloride and Phosphorus Pentoxide
d- Silver Nitrate + CaBr2 Silver Bromide and Calcium Nitrate
e- CdSO4 + H3PO4 Cadmium Phosphate and sulfuric acid
D) Using the first two balanced reactions from exercise C) calculate the following (8 marks)(show your work):
a- Given 123 g of Sodium carbonate, determine how much Carbon dioxide is formed
b- Given 153g of PbO2, how much water is formed
E) Write and balance the equations (10marks):
I) Beryllium + sulfuric acid -> beryllium sulfate + Hydrogen
II) Potassium hydroxide and hydrochloric acid -> potassium chloride + Water
III) Ethane (C2H6) + Oxygen -> Carbon Dioxide + Water
IV) Lithium carbonate + Barium Hydroxide -> Lithium Hydroxide + Barium carbonate
V) Nitric Acid and tin -> tin (IV) nitrate + hydrogen
VI) Lead (IV) carbonate + copper (II) iodide Lead (IV) iodide + copper (II) carbonate
VII) Chromium (III) oxide + zinc zinc oxide + chromium
VIII) Ammonia + hypochlorous acid nitrogen trichloride + water
IX) Bismuth sulfide + hydrochloric acid bismuth chloride + hydrogen sulfide
X) Magnesium hydroxide + ammonia magnesium nitride + water
Bonus(4 marks):
An emerald (green precious stone) has the formula Be3Al2Si16O18 calculate (6 marks):
1- The percent composition for each element in the emerald
2- If one carat is equivalent to 200 milligrams, how many carats would there be in a 0.21moles of emerald?