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Quiz 4.1 Chemical equation

Total questions: 48

Worksheet time: 2hrs 31mins

Name
Class
Date
1.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
2.

Translate the word equation below.

Sulfur Trioxide reacts with Water to form Sulfuric Acid (H2SO4).

a)

SO3 + H2O → H2SO4SO_3\ +\ H_2O\ \rightarrow\ H_2SO_4

b)

SO3 → H2O + H2SO4SO_3\ \rightarrow\ H_2O\ +\ H_2SO_4

c)

SO2 + H2O → H2SO4SO_2\ +\ H_2O\ \rightarrow\ H_2SO_4

d)

SO → H2O + H2SO4SO\ \rightarrow\ H_2O\ +\ H_2SO_4

3.

What are the coefficients that would properly balance this equation?

__Ca + __H2O --> __Ca(OH)2 + __H2

a)

2,1 --> 2,1

b)

1,2 --> 1,1

c)

1,2 --> 2,4

d)

1,2 --> 2,1

4.

Determine the coefficients to balance the equation.

__Al +__HCl --> __H2 +__AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

5.

What are the coefficients that would properly balance this equation?

__AgNO3 + __H2S --> __Ag2S+ __HNO3

a)

2,1 --> 1,2

b)

1,2 --> 1,1

c)

1,2 --> 1,2

d)

1,2 --> 2,1

6.

6 CO2 + 6 H2O → C6H12O6 + 6 O2


What is the total number of moles of CO2 needed to make 2 moles of C6H12O6?

a)

2.5

b)

6

c)

12

d)

15

7.

2 NaClO3 (s) → 2 NaCl (s) + 3 O2 (g)


12.00 moles of NaClO3 will produce how many grams of O2?

a)

256 g of O2

b)

576 g of O2

c)

288 g O2

d)

188 g O2

8.

B2H6 + 3 O2 → 2 HBO2 + 2 H2O


What mass of O2 will be needed to burn 36.1 g of B2H6?

a)

13.8 g O2

b)

3.86 mol of O2

c)

124 g O2

d)

32.6 g O2

9.

All alkali metal react with water to produce hydrogen gas and the corresponding alkaline metal hydroxide. A typical reaction is that between lithium and water :

2 Li (s) + 2 H2O (l) →2 LiOH (aq) + H2 (g)

Calculate the mass of H2 gas formed when 40.0 g of Li react with water [Ar H =1.0, Li = 6.9, O =16.0]

a)

4.21 g

b)

7.31 g

c)

5.80 g

d)

4.42 g

10.

Calcium carbonate decomposes when heated to release carbon dioxide gas.


CaCO3 (s) → CO2 (g) + CaO (s)


Calculate the volume of carbon dioxide gas released when 76.0 g of calcium carbonate decomposes.

a)

100.09 dm3

b)

75.93 dm3

c)

22.40 dm3

d)

17.01 dm3

11.

Iron reacts with solid sulfur to produce iron(II) sulfide powder.

a)

Fe + S → Fe2S

b)

Fe + S → FeS

c)

Fe2 + S→ Fe2S2

d)

Fe + S2 → Fe2S

12.

When lead reacts with oxygen, a yellow lead(II) oxide powder is produced.

a)

Pb + O2 → PbO

b)

Pb + O2→ PbO2

c)

Pb2 + O2→ Pb2O

d)

Pb + O → PbO

13.

sodium phosphate and calcium chloride produce calcium phosphate and sodium chloride

a)

Na3PO4 + CaCl2 --> Ca3(PO4)2 + NaCl

b)

Na3PO4 + CaCl2 --> Ca4PO2 + NaCl

c)

NaPO4 + CaCl2 --> Ca(PO4)2 + NaCl

d)

NaPO4 + CaCl2 --> Ca2(PO4)3 + NaCl

14.

Barium metal and water yields barium hydroxide and hydrogen gas

a)

Ba + H2O --> Ba(OH)2 + H2

b)

Ba2 + H2O --> Ba(OH)2 + H

c)

Ba + H2O --> BaOH2 + H

d)

Ba2 --> Ba(OH)2 + H2

15.

Copper and silver sulfate produces copper (II) sulfate and silver

a)

Cu + Ag2SO4 --> CuSO4 + Ag

b)

Cu2 + Ag2SO4 --> CuSO4 + Ag

c)

Cu + Ag2S --> CuS + Ag

d)

Cu2 + AgSO4 --> CuSO4 + Ag2

16.

What is the oxidation number of chlorine in HClO?

a)

0

b)

-1

c)

+1

d)

+5

17.

What is the oxidation number of iodine in KIO3?

a)

0

b)

-1

c)

+5

d)

+1

18.

Determine the oxidation number of chromate in CrO42-.

a)

+6

b)

0

c)

+2

d)

+3

19.

Which of the following represents oxidation?

a)

C → CH4

b)

Fe3+ → Fe2+

c)

Cl2 → 2Cl-

d)

Zn → ZnO

20.

In the reaction Zn + 2HCl --> ZnCl2 + H2

which element, if any, is oxidized?

a)

Zinc

b)

Hydrogen

c)

Chlorine

d)

None

21.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
22.
Which statement is true:
Mg → Mg2+ + 2e–
a)
Mg gains 2 electrons
b)
Mg2+ loses 2 electrons
c)
Mg loses 1 electron
d)
Mg loses 2 electrons
23.
Which of the following half reactions correctly represents a reduction half reaction?
a)
Fe →Fe2+ + 2e-
b)
Pb4+ + 2e- →Pb2+
c)
2O-2 →O2 + 4e-
d)
Fe + 3e- →Fe3+
24.
What element always has an oxidation number of -1?
a)
Hydrogen
b)
Fluorine
c)
Chlorine
d)
Iodine
25.

Which element is oxidized?

H2S + Cl2 → 2HCl + S

a)

Cl2

b)

H2S

c)

HCl

d)

Not a redox reaction

26.

Which equation represents a redox reaction?

a)

NaOH + HNO3 → NaNO3 +H2O

b)

2AgNO3 + Zn → Zn(NO3)2 + 2Ag

c)

2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3

d)

CaCO3 + 2HCl → CaCl2 + H2O + CO2

27.

The following chemical equation represents the extraction of silicon from quartz using coke.

SiO2 + C → Si + CO2

What is the change in oxidation number of silicon?

a)

+2 to 0

b)

+4 to 0

c)

0 to +2

d)

0 to +4

28.

Cl2 + 2e- --> 2Cl - is an example of:

a)

a chemical reaction

b)

redox

c)

oxidation

d)

reduction

29.

An increase in oxidation number.

a)

more acidic

b)

reduction

c)

less basic

d)

oxidation

30.

What is a half-reaction of this equation, Na + Cl --> NaCl ?

a)

Cl + e- --> Cl-

b)

Cl - e- --> Cl-

c)

Na --> Na + e-

d)

Na° + Cl°--> Na+1Cl-1

31.

The oxidation number of oxygen atoms in compounds is usually

a)

0

b)

-1

c)

-2

d)

+1

32.

When using the half-reaction method to balance redox reactions, to balance the oxygen on the right side of a half-reaction, you must add

a)

electrons to the left side

b)

oxygen gas to the left side.

c)

water to the left side

d)

O2– ions to the left side

33.

What is the oxidation number Cr in Cr2 O72- ?

a)

+4

b)

+5

c)

+6

d)

+7

34.

What is the oxidation number of Mn in MnO4- ?

a)

+4

b)

+5

c)

+6

d)

+7

35.

What is the oxidation number of C in SrCO3?

a)

-4

b)

+2

c)

-6

d)

+4

36.

Which change is an oxidation?

a)

FeO to Fe2O3

b)

Fe2O3 to FeO

c)

H2O2 to H2O

d)

H2O to H2

37.

In the reaction

2Ca(s) + O2(g) --> 2CaO(s), calcium is __________

a)

Reduced

b)

Synthesized

c)

Oxidized

d)

None of the above

38.

What is the oxidation number of N in NO2-1?

a)

-3

b)

+4

c)

-2

d)

+3

39.

WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:


Balance the following ACIDIC reactions using the half-reaction method.

MnO4−(aq) + H+(aq) + I− (aq) → Mn2+(aq) + I2(s)


Water is a product of this reaction. What is the coefficient of water in the final balanced equation?

a)

8

b)

5

c)

2

d)

16

40.

WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:


Balance the following reactions using the half-reaction method.

MnO4−(aq) + H+(aq) + I− (aq) → Mn2+(aq) + I2(s)

How many electrons did you cross out on both side?

a)

1 e-

b)

2 e-

c)

5 e-

d)

10 e-

41.

Consider the following REDOX reaction:

Cl2(g) → ClO−(aq) + Cl−(aq) (basic solution)

How many OH- ions did you add to the reactant side of this reaction when balancing?

a)

1

b)

2

c)

3

d)

4

42.

Which of the following reactions is balanced by both mass and charge?

a)

Fe2+ + Al →Fe + Al3+

b)

Cu + Fe2+ → Cu+ + Fe3+

c)

F2 + Br- --> F- + Br2

d)

Fe2+ + 2 Cu --> 2 Cu+ + Fe

43.

What are α and β and γ?

MnO2 + α H+ + β e- → Mn2+ + γ H2O

a)

α = 4 β = 2 γ = 2

b)

α = 2 β = 2 γ = 2

c)

α = 4 β = 4 γ = 2

d)

α = 2 β = 4 γ = 2

44.

What are α and β and γ?

NO3- + α H+ + β e- → NO + γ H2O

a)

α = 2 β = 3 γ = 4

b)

α = 2 β = 2 γ = 2

c)

α = 4 β = 4 γ = 3

d)

α = 4 β = 3 γ = 2

45.

What are α and β and γ and δ?

SO32- + α H2O → β SO42- + γ H+ + δ e-

a)

α = 1 β = 1 γ = 2 δ = 2

b)

α = 1 β = 2 γ = 2 δ = 2

c)

α = 1 β = 2 γ = 1 δ = 2

d)

α = 1 β = 1 γ = 2 δ = 1

46.

Which of these equations represents a redox reaction?

a)

Ca(HCO3)2 --> CaCO3 + H2O + CO2

b)

HC2H3O2 + NaOH --> NaC2H3O2 + H2O

c)

Zn + 2FeCl3 --> ZnCl2 + 2FeCl2

d)

NaCl + AgNO3 --> AgCl + NaNO3

47.

Which one of the following is a redox reaction?

a)

2CrO43- + 2H+ → Cr2O72- + H2O

b)

3Cl2 + 6OH− → 5Cl− + ClO3- + 3H2O

c)

HNO3 + 2H2SO4 → NO2+ + H3O+ + 2HSO4-

d)

CaCO3 + SiO2 → CaSiO3 + CO2

48.

Which one of the following is not a redox reaction?

a)

TiO2 + 2Cl2 + C → TiCl4 + CO2

b)

MnO2 + 4HCl → MnCl2 + 2H2O + Cl2

c)

MgO + 2HCl → MgCl2 + H2O

d)

3MnO42- + 4H+ → 2MnO4- + MnO2 + 2H2O

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