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Practice Balancing Chemical Equations, Predict Products, and Types of Reaction

Navigation   » List of Schools  »  Los Angeles Harbor College  »  Chemistry  »  Chem 065 – Introductory General Chemistry  »  Winter 2024  »  Practice Balancing Chemical Equations, Predict Products, and Types of Reaction

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Below are the questions for the exam with the choices of answers:

Question #1
What type of reaction is: Zn(s) + CoCl2(aq) → ZnCl2(aq) + Co(s)?
A  Single Displacement, Redox
B  Double Displacement, Combination
C  Double Displacement, Decompositio
D  Decomposition, Redox
Question #2
What type of reaction is: HI(aq) + NaOH(aq) → H2O(l) + NaI(aq)?
A  Single Displacement, Gas Evolution Reaction
B  Precipitation Reaction, Redox
C  Double Displacement, Acid-Base Reaction
D  Gas Evolution Reaction, Redox
Question #3
What type of reaction is: 2 Al(s) + Fe2O3(s) → Al2O3(s) + 2 Fe(s)?
A  Precipitation Reaction, Single Displacement
B  Double Displacement, Precipitation Reaction
C  Single Displacement, Redox
D  Double Displacement, Redox
Question #4
What type of reaction is: Ba(NO3)2(aq) + K2SO4(aq) → BaSO4(s) + 2 KNO3(aq)?
A  Acid-Base Reaction, Single Displacement
B  Redox, Gas-Evolution Reaction
C  Acid-Base Reaction, Redox
D  Double Displacement, Precipitation Reaction
Question #5
Which of the following is (are) true when aqueous hydrobromic acid and aqueous potassium sulfite are mixed?
A  Sulfur dioxide gas is produced
B  All of these
C  None of these
D  Potassium bromide is a product
E  The coefficient of hydrobromic acid is 2
Question #6
Which of the following is (are) true when aqueous nitric acid and aqueous sodium carbonate are mixed?
A  The coefficient of sodium carbonate is 2.
A gas is produced.
B  Liquid water is produced.
The coefficient of nitric acid is 1
C  The coefficient of sodium carbonate is 2.
The coefficient of nitric acid is 1
D  A gas is produced.
Liquid water is produced
Question #7
Which of the following is (are) true when solutions of sulfuric acid and potassium hydroxide are mixed?
A  The coefficient of potassium hydroxide is 2
B  None of these
C  All of these
D  Liquid water is produced
E  Potassium sulfate is a product
Question #8
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  The coefficient of potassium phosphate is 1.
One product has a coefficient of 3.
D  There is no reaction when the two solutions are mixed.
Question #9
Which of the following is (are) true when solutions of iron (II) chloride and cesium hydroxide are mixed?
A  There is no reaction
B  The coefficient of cesium hydroxide is 2
C  One of the products is ferric hydroxide
D  Both products form precipitates
Question #10
Which of the following is a redox reaction?
A  2 Mg(s) + O2(g) → 2 MgO(s),
Ca(s) + Cl2(g) → CaCl2(s),
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),
2 HBr(aq) + Ca(OH)2(aq) → 2 H2O(l) + CaBr2(aq)
Zn(s) + Fe2+ (aq) → Zn2+ (aq) + Fe(s)
Question #11
Which of the following is an oxidation-reduction reaction?
A  CaCl2 + Na2SO4 → CaSO4 + 2NaCl
B  KOH + HNO3 → H2O + KNO3
C  N2 + O2 → 2NO
D  AgNO3 + NaCl → AgCl + NaNO3
E  Al2(SO4)3 + 6KOH → 2Al(OH)3 + 3K2SO4
Question #12
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  combination
B  double replacement
C  oxidation
D  endothermic
E  single replacement
Question #13
What is the classification for this unbalanced reaction?

Fe + HCl → FeCl3 + H2

A  single replacement
B  dehydration
C  decomposition
D  combination
E  double replacement
Question #14
The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction?

2C(s) + O2(g) → 2CO(g)

A  double replacement
B  endothermic
C  combination
D  single replacement
E  catalytic
Question #15
What is the classification for this reaction?

SO3 (g) + H2O (l) → H2SO4(l)

A  single replacement
B  double replacement
C  decomposition
D  oxidation reduction
E  combination
Question #16
In a ________ reaction, two or more elements or compounds form one product.
A  dehydration
B  combination
C  single replacement
D  double replacement
E  decomposition
Question #17
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  8
B  5
C  2
D  6
E  4
Question #18
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  4
B  5
C  2
D  1
E  3
Question #19
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  5
B  4
C  1
D  3
E  2
Question #20
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  3
C  4
D  2
E  1
Question #21
In this reaction, what is the coefficient for calcium oxide?

CaO(s) + CO2(g) → CaCO3(s)

A  2
B  3
C  4
D  1
E  5
Question #22
What is the coefficient of hydrogen, H2, when the following equation is balanced?

Al + H2SO4 → Al2(SO4)3 + ? H2

A  2
B  3
C  5
D  4
E  1
Question #23
What coefficient is placed in front of O2 to complete the balancing of the following equation?
C5H8 + ? O2 → 5CO2 + 4H2O
A  9
B  7
C  5
D  1
E  3
Question #24
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  1, 1, 1 ,1
D  2, 4, 2, 4
E  1, 2, 1, 4
Question #25
Which of the following gives the balanced equation for this reaction?
K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3
A  KPO4 + CaNO3 + KNO3
B  2K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + 6KNO3
C  K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + 3KNO3
D  2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2 + 6KNO3
E  K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3
Question #26
In any balanced chemical equation, the number of each type of atom on both sides of the equation is
A  the same.
B  decreased by one.
C  increased by one.
D  doubled.
E  dependent on the temperature.
Question #27
A chemical equation is balanced when
A  the number of atoms of each element is the same in reactants and products.
B  the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products.
C  the charge on each atom is the same in reactants and products.
D  the total number of ions is the same in reactants and products.
E  the total number of molecules is the same in reactants and products.
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