# FEAS Study Worksheet – Part 2 (DOC)

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```					Name: ______________________            FEAS Study Worksheet – Part 2

1. If 20.9g of bismuth combines with 24.0g of bromine, what is the formula of the bismuth bromide formed?

2. If 20.9g of bismuth combines with 24.0g of bromine, what is the formula of the bismuth bromide formed?

3. If 16g of sulphur combines with 103.5g of lead, what is the formula of the lead sulphide formed?

4. Given the following symbol equation: 2Mg + O2 ==> 2MgO                   Calculate how many tonne of
magnesium is needed to make 80 tonne of magnesium oxide.

5. Given the following symbol equation: 2Mg + O2 ==> 2MgO           Calculate how many g of magnesium oxide is
formed by burning 24g of magnesium in air.

6. Given the symbol equation to show the formation of aluminium sulphide by heating a mixture of aluminium
and sulphur: 2Al + 3S ==> Al2S3          How many g of sulphur is needed if 54g of aluminium is reacted to
form 150g of aluminium sulphide?
Name: ______________________              FEAS Study Worksheet – Part 2

7. Given the following symbol equation: CaCO3(s) ==> CaO(s) + CO2(g)          Calculate how many kg of calcium
carbonate is needed to make 56 kg of calcium oxide.

8. Given the following symbol equation: CaCO3(s) ==> CaO(s) + CO2(g)       Calculate how many g of carbon
dioxide is formed if 25g of calcium carbonate is decomposed on heating to form 14g of calcium oxide.

9. In an experiment, excess chlorine was passed over 27g of heated aluminium metal until all the metal had
reacted. If 133.5g of white aluminium chloride was formed work out the formula of aluminium chloride.

10. If 28g of silicon combined with oxygen to form 60g of silicon oxide, work out the formula of silicon oxide.

11. The salt sodium sulphate, Na2SO4, can be made by neutralising sodium hydroxide with sulphuric acid:
2NaOH(aq) + H2SO4(aq) ==> Na2SO4(aq) + 2H2O(l)
How many g of sodium sulphate is formed when 8g of sodium hydroxide reacts?

12. Copper(I) sulphide ore can be converted to copper by roasting in air:
Cu2S(s) + O2(g) ==> 2Cu(s) + SO2(g)
How many g of copper can be made from 320g of the copper ore?
Name: ______________________              FEAS Study Worksheet – Part 2

13. The iron ore Haematite consists mainly of iron(III) oxide. In a blast furnace it is reduced to iron with carbon
monoxide:
Fe2O3(s) + 3CO(g) ==> 2Fe(l) + 3CO2(g)
How many tonne of haematite ore are needed to make 224 tonne of iron?

14. Yellow lead(II) oxide ore can be reduced by heating with charcoal (carbon) in a furnace to give silvery liquid
lead metal, lead(II) oxide + carbon ==> lead + carbon dioxide
2PbO(s) + C(s) ==> 2Pb(l) + CO2(g)
How many g of carbon dioxide are formed when 207 g of lead are produced?

15. The salt zinc chloride can be made by dissolving zinc carbonate in dilute hydrochloric acid.
ZnCO3(s) + 2HCl(aq) ==> ZnCl2(aq) + H2O(l) + CO2(g)
How many g of HCl are needed to make 408g of zinc chloride?

16. An organic compound consisted of 52.18% carbon, 13.04% hydrogen and 34.78% oxygen by mass. Deduce its
empirical formula.

17. 0.800g of magnesium reacted with 8.467g of iodine. Calculate the empirical formula for magnesium iodide?
Name: ______________________             FEAS Study Worksheet – Part 2

18. 7.75g of an alcohol consisted of 3.00g carbon, 0.75g hydrogen and 4.00g oxygen. If its molecular mass is 62,
work out the molecular formula.

19. It was found that 24g of carbon was combined with 5g of hydrogen in a hydrocarbon. If its molecular mass was
58, what is its molecular formula?

20. 0.55g of boron combined with 1.2g of oxygen. Deduce the empirical formula of boron oxide.

21. Given the equation: 2Na(s) + 2H2O(l) ==> 2NaOH(aq) + H2(g)        What mass of sodium in g will form 18 dm3 of
hydrogen gas, assuming R.T.P.?

22. What mass of gas, of molecular mass 36.5, is present in 4.8 dm3 of the gas, assuming R.T.P.?

23. Given the equation for magnesium dissolving in hydrochloric acid:
Mg(s) + 2HCl(aq) ==> MgCl2(aq) + H2(g)
What volume of hydrogen gas, in dm3, is formed when 4g of magnesium dissolves in the acid, assuming R.T.P.?
Name: ______________________            FEAS Study Worksheet – Part 2

24. Given the equation for the thermal decomposition of calcium carbonate (limestone):
CaCO3(s) ==> CaO(s) + CO2(g)
What mass of limestone in g, on strong heating, will form 120 cm3 carbon dioxide, assuming R.T.P.?

25. Given the equation for the thermal decomposition of calcium carbonate (limestone):
CaCO3(s) ==> CaO(s) + CO2(g)
What mass of limestone in g, on strong heating, will form 6 dm3 carbon dioxide, assuming R.T.P.?

26. Given the reaction between hydrogen and chlorine to form hydrogen chloride:
H2(g) + Cl2(g) ==> 2HCl(g)
What volume of hydrogen chloride in cm3 is made by reacting 300cm3 of chlorine, assuming R.T.P.?

27. Given the reaction between nitrogen and hydrogen to form ammonia:
N2(g) + 3H2(g) ==> 2NH3(g)
What volume of hydrogen in dm3 is needed to make 60dm3 of ammonia?
Name: ______________________             FEAS Study Worksheet – Part 2

28. The combustion of propane is given by the equation:
C3H8(g) + 5O2(g) ==> 3CO2(g) + 4H2O(l)
What volume of propane in cm3 can be completely burned by 200cm3 of oxygen?

29. The combustion of propane is given by the equation:
C3H8(g) + 5O2(g) ==> 3CO2(g) + 4H2O(l)
What volume of oxygen in cm3 is needed to burn 20cm3 of propane?

30. A cracking reaction to break down a large hydrocarbon molecule into, in order, hexane, propene and ethene, is
shown below.
C18H38(g) ==> C6H14(g) + 2C3H6(g) + 3C2H4(g)
What volume in cm3 of propene gas is formed when 120cm3 of the large hydrocarbon are broken down?

31. What is the molarity of the solution formed by dissolving 9.8 g of sulphuric acid (H2SO4) in 1000 cm3 of water?

32. What mass (g) of potassium hydroxide (KOH) is needed to make up 1000cm3 of a solution of concentration
1mol/dm3?
Name: ______________________             FEAS Study Worksheet – Part 2

33. What mass (g) of hydrogen chloride (HCl) is needed to make up 500cm3 of a solution of concentration
0.2mol/dm3?

34. What is the molarity of the solution formed by dissolving 196 g of sulphuric acid (H2SO4) in 1000 cm3 of water?

35. What is the molarity of the solution formed by dissolving 49 g of sulphuric acid (H2SO4) in 250 cm3 of water?

36. Given the neutralisation equation:
2KOH(aq) + H2SO4(aq) ==> K2SO4(aq) + 2H2O(l)
What is the molarity of a sulphuric acid solution, if 30 cm3 of it are neutralised by 10 cm3 of a 0.6 M potassium
hydroxide solution?

37. Given the neutralisation equation:
NaOH(aq) + HCl(aq) ==> NaCl(aq) + H2O(l)
25 cm3 of 0.16M hydrochloric acid are neutralised by 10 cm3 of a sodium hydroxide solution. What is the
molarity of the alkali?
Name: ______________________             FEAS Study Worksheet – Part 2

38. Given the neutralisation equation:
2KOH(aq) + H2SO4(aq) ==> K2SO4(aq) +2H2O(l)
What is the molarity of a potassium hydroxide solution, if 10 cm3 of it are neutralised by 12 cm3 of a 0.5 M
sulphuric acid solution?

39. Given the neutralisation equation:
NaOH(aq) + HCl(aq) ==> NaCl(aq) + H2O(l)
25 cm3 of hydrochloric acid are neutralised by 20 cm3 of 0.05M sodium hydroxide. What is the molarity of the
acid?

40. Given the neutralisation equation:
NaOH(aq) + HCl(aq) ==> NaCl(aq) + H2O(l)
15 cm3 of hydrochloric acid are neutralised by 25 cm3 of 0.06M sodium hydroxide. What is the molarity of the
acid?

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