1.The equation solid carbon + oxygen gas à carbon dioxide gas + energy represents a chemical reaction. The best chemical equation for this reaction would be
A.C(s) + O(g) à CO(g) + energy.
B.CO2 + energy.
C.C(s) + O2(g) à CO2.
D.C(s) + O2(g) à CO2(g) + energy.
2.The state of matter for a reactant or product in a chemical equation is indicated by a
A.coefficient before the formula.
B.subscript after the formula.
C.symbol after the formula.
D.superscript after the formula.
3.In an equation, the symbol for a substance in a water solution is
A.(l).
B.(g).
C.(aq).
D.(s).
4.In the chemical equation 2AlCl3(aq) + 3Pb(NO3)2(aq) à 3PbCl2(s) + 2Al(NO3)3(aq),
the state of PbCl2 is
A.liquid.
B.gas.
C.plasma.
D.solid.
5.Consider the reaction 4CuO(s) + CH4(g) 4Cu(s) + CO2(g) + 2H2O(g). What conditions are required for the reaction to occur?
A.Electricity must be added.
B.Heat must be added.
C.Heat must be removed.
D.The reaction will occur on its own.
6.Which is the correct complete chemical equation for this word equation? Solid aluminum oxide and hydrogen gas are heated to form molten aluminum and water vapor.
A.Al2O3 + H à Al + H2O
B.Al2O3(s) + H(g) à Al(s) + H2O(g)
C.Al2O3(s) + 3H2(g) à 2Al(s) + 3H2O(g)
D.Al2O3(s) + 3H2(g) à 2Al(l) + 3H2O(l)
7.In the reaction of magnesium oxide and hydrogen gas being heated to form magnesium and water vapor, which compounds are reactants?
A.MgO(s) + H2(g)
B.Mg(s) + H2O(g)
C.Mg(s) + H2(g)
D.MgO(s) + H2O(g)
8.If the reactants of the equation are zinc and hydrochloric acid, and the products are zinc chloride and hydrogen gas, the best chemical equation would be
A.Zn + HCl à ZnCl2 à H2.
B.Zn + HCl à ZnCl2 + H.
C.ZnHCl à ZnCl2H2.
D.ZnCl2 + H2 à Zn + HCl.
9.Water and silicon tetrafluoride are formed from the reaction of silicon dioxide and hydrogen fluoride. Which chemical equation represents this reaction?
A.SiF4 + H2O à SiO2 + HF4
B.SiF4 + H2O à SiO2 + HF
C.Si + O2 + HF à SiF4 + H2O
D.SiO2 + HF à SiF4 + H2O
A.C(s) + O(g) à CO(g) + energy.
B.CO2 + energy.
C.C(s) + O2(g) à CO2.
D.C(s) + O2(g) à CO2(g) + energy.
2.The state of matter for a reactant or product in a chemical equation is indicated by a
A.coefficient before the formula.
B.subscript after the formula.
C.symbol after the formula.
D.superscript after the formula.
3.In an equation, the symbol for a substance in a water solution is
A.(l).
B.(g).
C.(aq).
D.(s).
4.In the chemical equation 2AlCl3(aq) + 3Pb(NO3)2(aq) à 3PbCl2(s) + 2Al(NO3)3(aq),
the state of PbCl2 is
A.liquid.
B.gas.
C.plasma.
D.solid.
5.Consider the reaction 4CuO(s) + CH4(g) 4Cu(s) + CO2(g) + 2H2O(g). What conditions are required for the reaction to occur?
A.Electricity must be added.
B.Heat must be added.
C.Heat must be removed.
D.The reaction will occur on its own.
6.Which is the correct complete chemical equation for this word equation? Solid aluminum oxide and hydrogen gas are heated to form molten aluminum and water vapor.
A.Al2O3 + H à Al + H2O
B.Al2O3(s) + H(g) à Al(s) + H2O(g)
C.Al2O3(s) + 3H2(g) à 2Al(s) + 3H2O(g)
D.Al2O3(s) + 3H2(g) à 2Al(l) + 3H2O(l)
7.In the reaction of magnesium oxide and hydrogen gas being heated to form magnesium and water vapor, which compounds are reactants?
A.MgO(s) + H2(g)
B.Mg(s) + H2O(g)
C.Mg(s) + H2(g)
D.MgO(s) + H2O(g)
8.If the reactants of the equation are zinc and hydrochloric acid, and the products are zinc chloride and hydrogen gas, the best chemical equation would be
A.Zn + HCl à ZnCl2 à H2.
B.Zn + HCl à ZnCl2 + H.
C.ZnHCl à ZnCl2H2.
D.ZnCl2 + H2 à Zn + HCl.
9.Water and silicon tetrafluoride are formed from the reaction of silicon dioxide and hydrogen fluoride. Which chemical equation represents this reaction?
A.SiF4 + H2O à SiO2 + HF4
B.SiF4 + H2O à SiO2 + HF
C.Si + O2 + HF à SiF4 + H2O
D.SiO2 + HF à SiF4 + H2O