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Unit 7—Chemical Reactions Name Pre-AP Chemistry: Worksheet #2 Class Period 1. Explain why subscripts should never be changed when balancing an equation. 2. Balance the following equations: 3. a. U(s) + F2(g) b. Mg3N2 c. (NH4)2SO4 d. CH3OH(l) e. Al f. MnO2 g. Al2(SO4)3 h. AgCl i. (NH4)2CO3→ j. FeS2 + H2O + + + + →MgO O2(g) HCl→ + UF6(g) NaOH→ NaOH + + → + NH3 O2→ NH3 NH3 → + H2O CO2(g) H2O MnCl2 Ca(OH)2→ NH4OH + + + H2O(l) →NaAl(OH)4 + H2O + Al(OH)3 + CaSO4 →Ag(NH3)2Cl + H2O + Fe2O3 H2O + + Na2SO4 + H2 Cl2 CO2 SO2 Write balanced chemical equations for the following reactions. a. Magnesium metal and water combine to form solid magnesium hydroxide and hydrogen gas. Mg(s) + 2H2O(l) → Mg(OH)2(s) + H2(g) b. An aqueous solution of hydrogen peroxide (dihydrogen dioxide) and solid lead(II) sulfide combine to Unit 7—Chemical Reactions form solid lead(II) sulfate and water. 4H2O2(aq) + PbS(s) → PbSO4(s) + 4H2O (l) c. Lithium solid reacts with water to produce aqueous lithium hydroxide and hydrogen gas. 2Li(s) +2H2O(l) →2LiOH(aq) + H2(g) d. Solid copper(I) sulfide and oxygen gas react to form solid copper(II) oxide and sulfur dioxide gas. Cu2S(s) +2O2(g) →2CuO(s) + SO2(g) e. Solutions of ammonium nitrate and sodium hydroxide are combined to produce ammonia gas, water and aqueous sodium nitrate. NH4NO3(aq) + NaOH(aq) → NH3(g) + H2O(l) + NaNO3(aq) f. Solid calcium carbide, CaC2, reacts with water to produce acetylene gas, C2H2, and aqueous calcium hydroxide. CaC2(s) + 2H2O(l) g. → C2H2(g) + Ca(OH)2(aq) Aqueous aluminum nitrate and aqueous sodium hydroxide react to produce solid aluminum hydroxide and aqueous sodium nitrate. Al(NO3)3(aq) + 3NaOH(aq) → Al(OH)3(s) + 3NaNO3(aq) h. Solid barium chlorate, when heated, produces solid barium chloride and oxygen gas. ∆ Ba(ClO3)2(s) → BaCl2(s) + 3O2(g) i. Solution of hydrochloric acidand barium hydroxide react to form aqueous barium chloride and water. 2HCl(aq) + Ba(OH)2(aq) → BaCl2(aq) + 2H2O(l) j. Dinitrogen tetroxide gas decomposes into nitrogen dioxide gas. N2O4(g) → 2NO2(g) k. An aqueous solution of magnesium chloride is added to a silver nitrate solution. Aqueous magnesium nitrate and solid silver chloride form. MgCl2(aq) + 2AgNO3(aq) → Mg(NO3)2(aq) + 2AgCl(s)