7.4.5: Practice Classifying Reactions
- Page ID
- 236043
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Exercise \(\PageIndex{1}\)
Classify each reaction below as combination, decomposition, single displacement, double displacement, or combustion.
CaCO3 (s) \(\rightarrow\) CO2 (g) + CaO (s)
- Answer
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decomposition
2 N2 (g) + 5 O2 (g) \(\rightarrow\) 2 N2O5 (g)
- Answer
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combination
C5H10O (l) + 7 O2 (g) \(\rightarrow\) 5 CO2 (g) + 5 H2O (g)
- Answer
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combustion
ZnCl2 (aq) + 2 AgNO3 (aq) \(\rightarrow\) Zn(NO3)2 (aq) + 2 AgCl (s)
- Answer
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double displacement
Cl2 (g) + 2 KBr (aq) \(\rightarrow\) Br2 (l) + 2 KCl (aq)
- Answer
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single displacement
2 H2 (g) + O2 (g) \(\rightarrow\) 2 H2O (g)
- Answer
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combination
Mg (s) + HCl (aq) \(\rightarrow\) MgCl2 (aq) + H2 (g)
- Answer
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single displacement
Total Ionic and Net Ionic Equations
Exercise \(\PageIndex{1}\)
Give the total ionic equation ("complete ionic equation") and the net ionic equation for each reaction below.
ZnCl2 (aq) + 2 AgNO3 (aq) \(\rightarrow\) Zn(NO3)2 (aq) + 2 AgCl (s)
- Total Ionic
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Zn2+(aq) + 2 Cl1–(aq) + 2 Ag1+(aq) + 2 NO31–(aq) \(\rightarrow\) Zn2+(aq) + 2 NO31–(aq) + 2 AgCl (s)
- Net Ionic
-
2 Cl1–(aq) + 2 Ag1+(aq) \(\rightarrow\) 2 AgCl (s)
H3PO4 (aq) + 3 NaOH (aq) \(\rightarrow\) Na3PO4 (aq) + 3 H2O (l)
- Total Ionic
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3 H1+(aq) + PO43– (aq) + 3 Na1+(aq) + 3 OH1–(aq) \(\rightarrow\) 3 Na1+(aq) + PO43– (aq) + 3 H2O (l)
- Net Ionic
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3 H1+(aq) + 3 OH1–(aq) \(\rightarrow\) 3 H2O (l)
Precipitation Reactions
Exercise \(\PageIndex{1}\)
Which of the following compounds would not be soluble in water (and would form a solid precipitate)?
LiCl Pb(NO3)2 BaBr2 CaSO4 AgBr Zn(C2H3O2)2 MgSO4 CaCl2 K2CO3 NiPO4
- Answer
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CaSO4 AgBr NiPO4
For each of the reactions below, predict the products formed. Use the correct chemical formulas. Then balance the reaction and tell which product would be soluble ("aq" aqueous solution) and which would be insoluble ("s" solid precipitate).
CuCl2 (aq) + KOH (aq) \(\rightarrow\)
- Answer
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CuCl2 (aq) + 2 KOH (aq) \(\rightarrow\) 2 KCl (aq) + Cu(OH)2 (s)
CaCl2 (aq) + Pb(NO3)2 (aq) \(\rightarrow\)
- Answer
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CaCl2 (aq) + Pb(NO3)2 (aq) \(\rightarrow\) Ca(NO3)2 (aq) + PbCl2 (s)
Ba(ClO3)2 (aq) + Li2SO4 (aq) \(\rightarrow\)
- Answer
-
Ba(ClO3)2 (aq) + Li2SO4 (aq) \(\rightarrow\) 2 LiClO3 (aq) + BaSO4 (s)
Oxidation and Reduction
Exercise \(\PageIndex{1}\)
For each reaction below, tell which element is being oxidized and which is being reduced.
Mg (s) + HCl (aq) \(\rightarrow\) MgCl2 (aq) + H2 (g)
- Answer
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Mg is being oxidized (0 to +2 charge), Cl has no change (–1 to –1 charge), H is being reduced (+1 to 0 charge)
2 Al (s) + 3 Br2 (l) \(\rightarrow\) 2 AlBr3 (s)
- Answer
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Al is being oxidized (0 to +3 charge), Br is being reduced (0 to –1 charge)
Cl2 (g) + 2 KBr (aq) \(\rightarrow\) Br2 (l) + 2 KCl (aq)
- Answer
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Cl is being reduced (0 to –1 charge), K is not changing (+1 to +1 charge), Br is being oxidized (–1 to 0 charge).