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1 | |
Identify the following as empirical formulas or molecular formulas and indicate any uncertainty with (?):
(a) CH2O
(b) C6H12O6
(c) NaCl
(d) CH4
(e) F6
(f) CaF2 |
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2 | |
Calculate the formula weight for each of the following compounds:
(a) Dinitrogen monoxide
(b) Lead(II) sulfide
(c) Magnesium sulfate
(d) Mercury(II) chloride |
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3 | |
What is the mass percentage composition of the elements in the following compounds?
(a) Potash, K2CO3
(b) Gypsum, CaSO4
(c) Saltpeter, KNO3
(d) Caffeine, C8H10N4O2 |
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4 | |
Write balanced chemical equations for each of the following unbalanced reactions:
(a) NO + O2 → NO2
(b) KClO3 → KCl + O2
(c) NH4Cl + Ca(OH)2 → CaCl2 + NH3 + H2O
(d) NaNO3 + H2SO4 → Na2SO4 + HNO3
(e) PbS + H2O2 → PbSO4 + H2O
(f) Al2(SO4)3 + BaCl2 → AlCl3 + BaSO4 |
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5 | |
Identify the following as combination, decomposition, replacement, or ion exchange reactions:
(a) ZnCO3(s) → ZnO(s) + CO2↑
(b) 2 NaBr(aq) + Cl2(g) → 2 NaCl(aq) + Br2(g)
(c) 2 Al(s) + 3 Cl2(g) → 2 AlCl3(s)
(d) Ca(OH)2(aq) + H2SO4(aq) → CaSO4(aq) + 2 H2O(l)
(e) Pb(NO3)2(aq) + H2S(g) → 2 HNO3(aq) + PbS ↓
(f) C(s) + ZnO(s) → Zn(s) + CO↑ |
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6 | |
Write complete, balanced equations for each of the following reactions:
(a) C3H6(g) + O2(g) →
(b) H2SO4(aq) + KOH(aq) →
(c) C6H12O6(s) + O2(g) →
(d) Na3PO4(aq) + AgNO3(aq) →
(e) NaOH(aq) + Al(NO3)3(aq) →
(f) Mg(OH)2(aq) + H3PO4(aq) → |
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7 | |
Write complete, balanced equations for each of the following decomposition reactions. Include symbols for physical states, heating, and others as needed:
(a) When solid zinc carbonate is heated, solid zinc oxide and carbon dioxide gas are formed.
(b) Liquid hydrogen peroxide decomposes to liquid water and oxygen gas.
(c) Solid ammonium nitrite decomposes to liquid water and nitrogen gas. |
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8 | |
Write complete, balanced equations for each of the following replacement reactions. If no reaction is predicted, write "no reaction" as the product:
(a) Zn(s) + FeCl2(aq) →
(b) Zn(s) + AlCl3(aq) →
(c) Cu(s) + HgCl2(aq) →
(d) Al(s) + HCl(aq) → |
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9 | |
Write complete, balanced equations for each of the following ion exchange reactions. If no reaction is predicted, write "no reaction" as the product:
(a) Ca(OH)2(aq) + H2SO4(aq) →
(b) NaCl(aq) + AgNO3(aq) →
(c) NH4NO3(aq) + Mg3(PO4)2(aq) →
(d) Na3PO4(aq) + AgNO3(aq) → |
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10 | |
Iron(III) oxide, or hematite, is one mineral used as an iron ore. Other iron ores are magnetite (Fe3O4) and siderite (FeCO3). Assume that you have pure samples of all three ores that will be reduced by reaction with carbon monoxide. Which of the three ores will have the highest yield of metallic iron? |
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