CH100: General Chemistry
Coursework # 5:
Exercise 1:
(a) Balance the following reactions.
i. Ca (s) + H2O (l) H2 (g) + Ca(OH)2 (aq)
ii. C6H10 + O2 (g) CO2 (g) + H2O (g)
iii. C6H14 + O2 (g) CO2 (g) + H2O (g)
(b) Calculate the number of moles and the mass of the products of each reaction, if:
i.
ii. 3mol Ca, 4mol C6H10, 1mol C6H14 react respectively
32g Ca, 164g C6H10, 42g C6H14 react respectively Tip: you need to take into account the stoichiometry of the reaction and the Molar masses of the products: M rCa=32, Mrc=12,
MrH=1, MrO=16. Exercise 2:
(a) The following reaction destroys ozone in the stratosphere. What are the oxidation numbers of the
indicated elements? Write the balanced equation.
NO (g) + O3 (g) NO2 (g) + O2 (g)
Is the N oxidized or reduced in the above reaction?
(b) In the following reaction give the oxidation number of Fe in the reactant and product and write the
balanced equation.
Fe (s) + H2O (g) Fe2O3 (s) + H2 (g)
Does the iron get oxidized or reduced? Which is the other atom that changes its oxidation number? Is it
reduced or oxidized?
Tip: in order to conclude whether a compound is reduced or oxidized, you need to calculate the oxidation number of all the
elements (using the rules) in both parts of the equation. If the oxidation number of an element reduces on the right part
compared to the value on the left part, then the element is reduced and the compound that contains the specific element is
reduced. The opposite happens for the oxidation. Exercise 3:
Balance the following redox reaction.
(a) Au+ (aq) + Cu (s) Au (s) + Cu+2 (aq) (b) Fe2+ (aq) + K (s) Fe (s) + K+ (aq) (c) F2 (g) + H2O (l) O3 (g) + HF (g)
(d) Al (s) + HCN (aq) H2 (g) + Al(CN)3 (aq)
Indicate which reactant is reduced and which is oxidized in each equation.
Tip: be careful of the charges… Exercise 4: Identify, complete and balance the following chemical reactions, then write the net ionic equation for
each.
(a) Pb(NO3)2 (aq) + K2SO4 (aq) (b) H2SO4 (aq) + NaOH (aq) (c) Fe2(SO4)3 (aq) + Ca(OH)2 (aq) (d) AgNO3 (aq) + KI (aq) (e) K3PO4 (aq) + Ba(OH)2 (aq) Tip: Identification of the chemical reaction means to conclude about its type – precipitation, single displacement, double
displacement, acid-base reaction etc …

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