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Homework Practice

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From Words to Chemical Equations

Section A: Word and Skeletal Equations

Question 1mcq
Magnesium burns in oxygen to form magnesium oxide. Which word equation is correct?
A.Magnesium + Oxygen →\rightarrow Magnesium oxide
B.Magnesium oxide →\rightarrow Magnesium + Oxygen
C.Oxygen →\rightarrow Magnesium + Magnesium oxide
D.Magnesium + Magnesium oxide →\rightarrow Oxygen
Question 2mcq
Which is the correct skeletal equation for hydrogen burning in oxygen to form water?
A.H2+O2→H2OH_2 + O_2 \rightarrow H_2O
B.H2O→H2+O2H_2O \rightarrow H_2 + O_2
C.H2+O→H2O2H_2 + O \rightarrow H_2O_2
D.H+O→H2OH + O \rightarrow H_2O
Question 3mcq
Which formula is correct for calcium chloride?
A.CaClCaCl
B.Ca2Cl2Ca_2Cl_2
C.Ca2ClCa_2Cl
D.CaCl2CaCl_2
Question 4mcq
Zinc reacts with hydrochloric acid to produce zinc chloride and hydrogen gas. The correct word equation is:
A.Zinc + Hydrochloric acid →\rightarrow Zinc chloride + Hydrogen
B.Hydrochloric acid →\rightarrow Zinc + Hydrogen
C.Zinc + Hydrogen →\rightarrow Zinc chloride + Hydrochloric acid
D.Zinc chloride + Hydrogen →\rightarrow Zinc + Hydrochloric acid
Question 5mcq
Choose the correct skeletal equation for zinc reacting with hydrochloric acid.
A.Zn+HCl→ZnCl+HZn + HCl \rightarrow ZnCl + H
B.ZnCl2+H2→Zn+HClZnCl_2 + H_2 \rightarrow Zn + HCl
C.Zn+H2Cl→ZnCl2Zn + H_2Cl \rightarrow ZnCl_2
D.Zn+HCl→ZnCl2+H2Zn + HCl \rightarrow ZnCl_2 + H_2
Question 6mcq
Before balancing Al+O2→Al2O3Al + O_2 \rightarrow Al_2O_3, which rule should be remembered?
A.Do not change subscripts in chemical formulae
B.Write only word equations for metals
C.Change Al2O3Al_2O_3 to AlOAlO if needed
D.Balance by removing oxygen

Section B: State Symbols and Equation Conditions

Question 7mcq
In NaCl(aq)NaCl(aq), the symbol (aq)(aq) means:
A.Gas
B.Solid
C.Aqueous solution
D.Liquid metal
Question 8mcq
Which state symbol represents gas?
A.(l)(l)
B.(aq)(aq)
C.(s)(s)
D.(g)(g)
Question 9mcq
In a chemical equation, an upward arrow ↑\uparrow usually indicates:
A.Evolution of a gas
B.Formation of a liquid
C.Cooling only
D.Use of a catalyst
Question 10mcq
The symbol Δ\Delta written above the arrow usually means:
A.The reaction is impossible
B.Heat is supplied
C.The product is a precipitate
D.A gas is collected
Question 11mcq
Which equation uses state symbols most appropriately for silver chloride precipitation?
A.AgNO3(aq)+NaCl(aq)→AgCl(g)+NaNO3(l)AgNO_3(aq)+NaCl(aq)\rightarrow AgCl(g)+NaNO_3(l)
B.AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)AgNO_3(aq)+NaCl(aq)\rightarrow AgCl(s)+NaNO_3(aq)
C.AgNO3(s)+NaCl(g)→AgCl(aq)+NaNO3(s)AgNO_3(s)+NaCl(g)\rightarrow AgCl(aq)+NaNO_3(s)
D.AgNO3(l)+NaCl(l)→AgCl(aq)+NaNO3(g)AgNO_3(l)+NaCl(l)\rightarrow AgCl(aq)+NaNO_3(g)
Question 12mcq
Why is the arrow →\rightarrow used in a chemical equation?
A.It means both sides are mathematically equal only
B.It means products are written on the left
C.It means no reaction occurs
D.It shows the direction from reactants to products