Chem 065 - Introductory General Chemistry » Winter 2024 » Practice Balancing Chemical Equations, Predict Products, and Types of Reaction
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Question #1
A chemical equation is balanced when
A.
the total number of molecules is the same in reactants and products.
B.
the charge on each atom is the same in reactants and products.
C.
the number of atoms of each element is the same in reactants and products.
D.
the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products.
E.
the total number of ions is the same in reactants and products.
Question #2
In any balanced chemical equation, the number of each type of atom on both sides of the equation is
A.
increased by one.
B.
decreased by one.
C.
dependent on the temperature.
D.
the same.
E.
doubled.
Question #3
Which of the following gives the balanced equation for this reaction? K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3
A.
2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2 + 6KNO3
B.
K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3
C.
2K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + 6KNO3
D.
K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + 3KNO3
E.
KPO4 + CaNO3 + KNO3
Question #4
Which of the following correctly gives the best coefficients for the reaction below? N2H4 + H2O2 → N2 + H2O
A.
2, 4, 2, 8
B.
1, 4, 1, 4
C.
2, 4, 2, 4
D.
1, 1, 1 ,1
E.
1, 2, 1, 4
Question #5
What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8 + ? O2 → 5CO2 + 4H2O
A.
7
B.
5
C.
1
D.
3
E.
9
Question #6
What is the coefficient of hydrogen, H2, when the following equation is balanced? Al + H2SO4 → Al2(SO4)3 + ? H2
A.
5
B.
1
C.
2
D.
3
E.
4
Question #7
In this reaction, what is the coefficient for calcium oxide? CaO(s) + CO2(g) → CaCO3(s)
A.
1
B.
2
C.
3
D.
4
E.
5
Question #8
In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride? Pb(NO3)2(aq) + NaCl(aq) → PbCl2(s) + NaNO3(aq)
A.
5
B.
1
C.
4
D.
3
E.
2
Question #9
In the following reaction, when the equation is correctly balanced, what is the correct coefficient for H2? Fe(s) + HCl(aq) → FeCl3(aq) + H2(g)
A.
3
B.
4
C.
5
D.
1
E.
2
Question #10
In the following reaction, when the equation is correctly balanced, what is the correct coefficient for aluminum chloride? Al(s) + Cl2(g) → AlCl3(s)
A.
3
B.
1
C.
4
D.
2
E.
5
Question #11
Pentane (C5H12) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. Answer the question(s) that follow about this reaction. C5H12 + ? O2 → ? CO2 + ? H2O What is the coefficient for carbon dioxide in the balanced equation?
A.
5
B.
8
C.
2
D.
4
E.
6
Question #12
In a ________ reaction, two or more elements or compounds form one product.
A.
dehydration
B.
decomposition
C.
double replacement
D.
single replacement
E.
combination
Question #13
What is the classification for this reaction? SO3 (g) + H2O (l) → H2SO4(l)
A.
single replacement
B.
combination
C.
oxidation reduction
D.
decomposition
E.
double replacement
Question #14
A.
catalytic
B.
single replacement
C.
endothermic
D.
double replacement
E.
combination
Question #15
What is the classification for this unbalanced reaction? Fe + HCl → FeCl3 + H2
A.
single replacement
B.
decomposition
C.
combination
D.
double replacement
E.
dehydration
Question #16
The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction? CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
A.
oxidation
B.
single replacement
C.
double replacement
D.
combination
E.
endothermic
Question #17
A.
Al2(SO4)3 + 6KOH → 2Al(OH)3 + 3K2SO4
B.
KOH + HNO3 → H2O + KNO3
C.
CaCl2 + Na2SO4 → CaSO4 + 2NaCl
D.
AgNO3 + NaCl → AgCl + NaNO3
E.
N2 + O2 → 2NO
Question #18
Which of the following is a redox reaction?
A.
2 Mg(s) + O2(g) → 2 MgO(s), 2 HBr(aq) + Ca(OH)2(aq) → 2 H2O(l) + CaBr2(aq) Zn(s) + Fe2+ (aq) → Zn2+ (aq) + Fe(s)
B.
2 Mg(s) + O2(g) → 2 MgO(s), Ca(s) + Cl2(g) → CaCl2(s), 2 HBr(aq) + Ca(OH)2(aq) → 2 H2O(l) + CaBr2(aq)
C.
2 HBr(aq) + Ca(OH)2(aq) → 2 H2O(l) + CaBr2(aq) Ca(s) + Cl2(g) → CaCl2(s), Zn(s) + Fe2+ (aq) → Zn2+ (aq) + Fe(s)
D.
2 Mg(s) + O2(g) → 2 MgO(s), Ca(s) + Cl2(g) → CaCl2(s), Zn(s) + Fe2+ (aq) → Zn2+ (aq) + Fe(s)
Question #19
Which of the following is (are) true when solutions of iron (II) chloride and cesium hydroxide are mixed?
A.
Both products form precipitates
B.
There is no reaction
C.
The coefficient of cesium hydroxide is 2
D.
One of the products is ferric hydroxide
Question #20
Which of the following is (are) true when solutions of chromium(III) nitrate and potassium phosphate are mixed?
A.
The coefficient of potassium phosphate is 1. One of the product is Cr3PO4
B.
One product has a coefficient of 3 One of the product is Cr3PO4
C.
There is no reaction when the two solutions are mixed.
D.
The coefficient of potassium phosphate is 1. One product has a coefficient of 3.
Question #21
Which of the following is (are) true when solutions of sulfuric acid and potassium hydroxide are mixed?
A.
Liquid water is produced
B.
The coefficient of potassium hydroxide is 2
C.
None of these
D.
All of these
E.
Potassium sulfate is a product
Question #22
Which of the following is (are) true when aqueous nitric acid and aqueous sodium carbonate are mixed?
A.
Liquid water is produced. The coefficient of nitric acid is 1
B.
The coefficient of sodium carbonate is 2. The coefficient of nitric acid is 1
C.
A gas is produced. Liquid water is produced
D.
The coefficient of sodium carbonate is 2. A gas is produced.
Question #23
Which of the following is (are) true when aqueous hydrobromic acid and aqueous potassium sulfite are mixed?
A.
Sulfur dioxide gas is produced
B.
Potassium bromide is a product
C.
The coefficient of hydrobromic acid is 2
D.
All of these
E.
None of these
Question #24
What type of reaction is: Ba(NO3)2(aq) + K2SO4(aq) → BaSO4(s) + 2 KNO3(aq)?
A.
Redox, Gas-Evolution Reaction
B.
Acid-Base Reaction, Single Displacement
C.
Double Displacement, Precipitation Reaction
D.
Acid-Base Reaction, Redox
Question #25
What type of reaction is: 2 Al(s) + Fe2O3(s) → Al2O3(s) + 2 Fe(s)?
A.
Precipitation Reaction, Single Displacement
B.
Double Displacement, Redox
C.
Double Displacement, Precipitation Reaction
D.
Single Displacement, Redox
Question #26
What type of reaction is: HI(aq) + NaOH(aq) → H2O(l) + NaI(aq)?
A.
Precipitation Reaction, Redox
B.
Double Displacement, Acid-Base Reaction
C.
Single Displacement, Gas Evolution Reaction
D.
Gas Evolution Reaction, Redox
Question #27
What type of reaction is: Zn(s) + CoCl2(aq) → ZnCl2(aq) + Co(s)?
A.
Double Displacement, Combination
B.
Single Displacement, Redox
C.
Decomposition, Redox
D.
Double Displacement, Decompositio
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