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Portage Learning CHEM 103 MODULE 2 EXAM 2022 with Questions and RAtionales
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Portage Learning CHEM 103 MODULE 2 EXAM2022 with Questions and RAtionales
Balance each of the following equations by placing coefficients in front of
each substance.
1. C6H6 + O2 → CO2 + H 2O
2. As + O2 → As2O5
3. Al2(SO4)3 + Ca(OH)2 → Al(OH)3 + CaSO4
1. 2C6H6 + 15O2 → 12CO2 + 6H2O
2. 4 As + 5 O2 → 2 As2O5
3. Al2(SO4)3 + 3 Ca(OH)2 → 2 Al(OH)3 + 3 CaSO4
.
Classify each of the following reactions as either:
Combination
Decomposition
Combustion
Double Replacement
Single Replacement
1. H2SO4 → SO3 + H2O
2. S+3F2 → SF6
3. H2 + NiO → Ni + H2O
1. H2SO4 →SO3+ H2O = Decomposition, One reactant → Two Products
2. S + 3 F2 → SF6 = Combination. Two reactants→ One product
, 3. H2 + NiO → Ni + H2O = Single Replacement, Hydrogen displaces metal ion
Show the calculation of the oxidation number (charge) of ONLY the atoms
which are changing in the following redox equations.
Na2HAsO3 + KBrO3 + HCl → NaCl + KBr + H3AsO4
Na2HAsO3 + KBrO3 + HCl → NaCl + KBr + H3AsO4
Na2HAsO3: Na is metal in group I = +1 (total is +2), H = +1, each O is -2 (total
is -6), so As is +3
H3AsO4: H is +1 (total is +3), each O is -2 (total is -8), so As is +5
KBrO3: K is metal in group I = +1, each O is -2 (total is -6), so Br is +5
KBr: K is metal in group I = +1, so Br is -1
Show the balancing of the following redox equation, including the determination of
the oxidation number (charge) of ONLY the atoms which are changing.
KMnO4 + KI + → + MnO2 + KOH
H2O KIO3
Mn compounds x 2 ; I compounds x 1 =
2KMnO4 + 1 KI + 1 H2O → 1 KIO3 + 2MnO2 + 2KOH
KMnO4 + KI + → + MnO2 + KOH
H2 O KIO3
KMnO4: K is metal in group I = +1, each O is -2 (total is -8), so Mn is +7
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