2/18/2009
Science 20 Unit A: Chemistry
Balancing Single
Replacement Reactions &
Simple Stoich Assignment
Part A) Balance each single replacement reaction. (1 mark each)
1)
____ Ca(OH)2(aq) + ____ H2(g)  _____ H2O(l) + _____ Ca(s)
2)
____ Zn(s) + ____ H2CO3(aq)  _____ H2(g) + _____ ZnCO3(aq)
3)
____ Pb(s) + ____ Hg2S(aq)  ______ Hg(s) + ______ PbS(aq)
4)
_____ Na(s) + _____ HOH(l)  _____ NaOH(aq) + _____ H2(g)
5)
_____ Fe(s) + _____ Al2O3(s)  _____ Al(s) + _____ Fe2O3(s)
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Name: ___________
Date: ___________
2/18/2009
Part B) Determine the number of moles required or given using
Make sure you show the starting formula, units and proper sig digs to get full marks.
1) Using the equation below, determine the amount of silver (Ag(s)) required to make 0.876
mol of silver sulfide (Ag2S(s)). (2 marks)
4 Ag(s) + 2 H2S(g) + O2(g)  2 Ag2S(s) + 2H2O(l)_
2) Using the equation below, determine the amount of silver (Ag(s)) produced if 1.5 x 103
mol of iron (III) oxide (Fe2O3(s)) is reacted. (2 marks)
Fe2O3(s) + 3 CO(g)  2 Fe(s) + 3 CO2(g)
3) Using the equation below, determine the amount of copper (Cu(l)) produced if 200 mol of
copper (I) oxide (Cu2O(l)) is reacted. (2 marks)
2 Cu2O(l) + Cu2S(l)  6 Cu(l) + SO2(g)
Bonus Question: Answer Only ONE!!!
Fair Bonus Question: Give an example of an ion or atom that can be both reduced and oxidized.
Unfair Bonus Question: What is another mnemonic for remembering that Oxidation Is Loss of electrons and Reduction Is Gain of electrons?
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