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Worksheets

CTA 3rd Qtr Rev

Total questions: 76

Worksheet time: 4hrs 58mins

Name
Class
Date
1.

Mg +  HCl --->  MgCl2 + H2
How many HCl moles do you need to balance this equation? 

a)
1
b)
2
c)
3
d)
4
2.
Na  +  O2 ----->  Na2O
What is the coeffient for Na in the properly balanced equations?
a)
1
b)
2
c)
3
d)
4
3.
2NaHCO3  -> Na2CO3  +  CO2  + H2O
To properly balance the chemical equation, what must the coefficient be for the Sodium Bicarbonate?
a)
1
b)
2
c)
4
d)
8
4.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2
a)
3,1 --> 2,3
b)
3,2 --> 1,1
c)
3,2 --> 2,4
d)
3,2 --> 2,1
5.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
6.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
7.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
8.
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?
a)
3mol Mg / 2 mol Fe
b)
2 mol Mg/ 3 mol Fe
c)
1 mol Fe/ 2 mol Fe
d)
3 mol MgO / 2 mol Fe
9.

What is the mole ratio of HCl to CaCl2 in this reaction:

Ca(OH)2 + 2 HCl --> CaCl2 + 2 H2O

a)

2:2

b)

1:1

c)

1:2

d)

2:1

10.
What is a Excess Reagent?
a)
amount you end with
b)
what you run out of first
c)
what you have left over
d)
what you start with
11.
When does a chemical reaction stop?
a)
When the lab is finished
b)
When the excess reactant is used up
c)
When the limiting reactant is used up
d)
Chemical reactions never stop
12.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Ask for help
13.
Cl2 + 2 KBr → Br2 + 2 KCl
How many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?
a)
749 g
b)
223 g
c)
479 g
d)
814 g
14.

B2H6 + 3O2 -->2 HBO2 + 2 H2O

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

a)

13.8 g

b)

3.86 g

c)

124 g

d)

198.3 g

15.

What is the percent yield of the following reaction if 145g of P2O5 reacts with 40 grams of water, but you only collect 112 grams of phosphoric acid?

3 H2O + P2O5 -> 2H3PO4

a)

80%

b)

85%

c)

77%

d)

58%

16.

Balance the reaction: _AlBr3 + _K2SO4 → _KBr + _Al2(SO4)3

a)

6 AlBr3 + 1 K2SO4 → 6 KBr + 1 Al2(SO4)3

b)

2 AlBr3 + 3 K2SO4 → 6 KBr + 1 Al2(SO4)3

c)

1 AlBr3 + 1 K2SO4 → 2 KBr + 3 Al2(SO4)3

d)

2 AlBr3 + 3 K2SO4 → 1 KBr + 2 Al2(SO4)3

17.
Fe + S --> FeS
If 7.62g Fe react with 8.67g S, what is the limiting reactant?
a)
Fe
b)
S
c)
FeS
d)
none 
18.

What is the limiting reactant if 10 moles of NH3 react with 30.0 moles of NO?

4NH3+ 6NO --> 5N2 + 6H2O

a)

NH3

b)

NO

c)

N2

d)

water

19.

Identify the following chemical reaction.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

20.

Identify the following chemical reaction.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

21.

Which chemical reaction always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water?

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

22.
Pb(NO3)2 →PbO + NO2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
23.
An element plus additional element reacts to form one product is an example of which type of chemical reaction? 
a)
combustion
b)
decomposition 
c)
synthesis 
d)
single replacement
24.

If an element is diatomic it should have a subscript of___

a)

1, always

b)

2, only when it is an element

c)

it shouldn't have a subscript, it should have a coefficent

d)

2, when bonded in a compound

25.

Predict the products of this synthesis reaction: H2 + Cl2 →

a)

HCl

b)

H2Cl2

c)

H2Cl

d)

HCl2

26.

Predict the products for the this Double Replacement reaction:

AgNO3 + KCl →

a)

AgCl + KNO3

b)

AgK + ClNO3

c)

KAg + NO3Cl

d)

AgCl + 3 KNO

27.

What are the correct formulas and coefficients for the products of the following CSR?

Mg + Al(OH)3 →

a)

No Reaction

b)

Al + Mg(OH)3

c)

Al + Mg(OH)2

d)

MgAl + (OH)3

28.

The equation for Percent Yield:

a)

(predicted/experimental) X 100

b)

(actual or experimental/theoretical or predicted) X 100

c)

(experimental - predicted)/ Predicted X 100

29.
True or False. You must convert grams to moles to do stoichiometry.
a)
True
b)
False
30.
Calculate the molar mass of Mg(OH)2.
a)
33.2 g/mol
b)
41.3 g/mol
c)
86.9 g/mol
d)
58.3 g/mol
31.

For the reaction 2Na + Cl2 → 2NaCl, calculate the percent yield if 200. g of chlorine react with excess sodium to produce 240. g of sodium chloride?

a)

61.2%

b)

88.4%

c)

83.4%

d)

72.8%

32.
What is the mass of one mole of aluminum chloride (remember to determine the correct formula first)?
a)
62.435g
b)
116.399g
c)
133.341g
d)
97.888g
33.
What is the Molar mass of the Baking Soda? (NaHCO3)
a)
84 g
b)
84 amu
c)
52 g
d)
52 amu
34.

Calculate the molar mass of Ba(C2H3O2)2

a)

255.3 g/mol

b)

237.3 g/mol

c)

228.3 g/mol

d)

196.3 g/mol

35.

How do you know an equation is balanced?

a)

The coefficients on the left equal the coefficients on the right.

b)

The subscripts on the left equal the subscripts on the right.

c)

There are an equal number of each type of atom on both sides of the arrow

d)

The elements on the left are the same as the elements on the right.

36.

How many atoms are in 1 mole of Gallium (Ga)?

a)

It depends on the molar mass

b)

69.723 atoms

c)

31 ⋅102331\ \cdot10^{23}  atoms

d)

6.022 ⋅10236.022\ \cdot10^{23}  atoms

37.
How many moles are present in 32.3 grams of carbon dioxide (CO2)?
a)
44.01 moles
b)
1421.52 moles
c)
32.3 moles
d)
0.73 moles
38.

How many moles are in 106.3 g of Copper, Cu?

a)

167 mols

b)

1.673 mols

c)

16.73 mols

d)

.167 mols

39.

A chemical reaction is the process of breaking molecular bonds and reforming them into a new _____.

a)

atom

b)

element

c)

substance

d)

mixture

40.
If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the
a)
theoretical yield
b)
mole ratio
c)
actual yield
d)
percentage yield
41.
What is the measured amount of a product obtained from a chemical reaction?
a)
mole ratio
b)
theoretical yield
c)
percentage yield
d)
actual yield
42.
Mole ratios are obtained from the
a)
balanced chemical equation
b)
periodic table
c)
molar mass
43.

Fill in the steps required to find the number of grams of substance B produced     from the number of grams of substance A:

grams of A →\rightarrow  ________ →\rightarrow _______ →\rightarrow  ______= grams of B.

a)

1 mol of AMolar Mass of A3; Molar Mass of B1 mol of B; Moles of BMoles of A\frac{1\ mol\ of\ A}{Molar\ Mass\ of\ A^3};\ \frac{Molar\ Mass\ of\ B}{1\ mol\ of\ B};\ \frac{Moles\ of\ B}{Moles\ of\ A}  

b)

1 mol of AMolar Mass of A3; Moles of BMoles of A; Molar Mass of B1 mol of B\frac{1\ mol\ of\ A}{Molar\ Mass\ of\ A^3};\ \frac{Moles\ of\ B}{Moles\ of\ A};\ \frac{Molar\ Mass\ of\ B}{1\ mol\ of\ B}  

44.
Fe (s) + S (l) --> FeS (s)  

In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?
a)
14.8 g
b)
12.2 g
c)
13.7 g
d)
19.9 g
45.
11.
LiOH + KCl → LiCl + KOH 

b)  I actually produced 6 grams of lithium chloride and I began this reaction with 20 grams of lithium hydroxide. What is my percent yield?
a)
16.9%
b)
5.91%
c)
1.88%
d)
12.3%
46.
Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl2.
 
1 Mg +  2 HCl --> 1 MgCl2  +  1 H2   
 
a)
Mg
b)
H2
c)
MgCl2
d)
HCl
47.

How many grams are in 7.8 moles of NaCl?

a)

476 grams

b)

460 grams

c)

452 grams

d)

462 grams

48.
The Formula to make S'mores is:
2C + 1M + G2 → C2MG2. If you have 5 Marshmallows (M), 9 Chocolate Pieces (C), and 9 Graham Cracker Halves (G), how many S'mores can you make?
a)
5
b)
4
c)
8
d)
42
49.
The mass of one mole of substance is called...
a)
molecular mass
b)
mole constant
c)
molar mass
d)
atomic weight
50.
What is the molar mass of fluorine gas?
(beware!)
a)
18.998 g/mol
b)
38 g/mol
c)
9 g/mol
d)
18 g/mol
51.

Given the following equation, what is the mole ratio of iron(IV) sulfide to sulfur dioxide: FeS2+O2→Fe2O3+SO2FeS_2+O_2→Fe_2O_3+SO_2

a)

1:2

b)

8:4

c)

1:4

d)

4:8

e)

8:11

52.

The balanced equation 2Cu (s) + O2 (g) → 2 CuO (s) tells us that 4.0 mol of Cu

a)

reacts with 4.0 mol of O2

b)

produces 4.0 mol of CuO

c)

must react with 128 g of O2

d)

cannot react with oxygen

e)

produces 8.0 mol of CuO

53.

All of the following are false except:

a)

The subscripts in a chemical equation are used to determine the mole-to-mole ratio.

b)

The theoretical yield is the amount of substance calculated in an equation.

c)

Stoichiometry can be used to determine the relationship of an unbalanced equation to mass of products produced.

d)

How much product is formed can be found from the excess reactant.

e)

Percent yield comes from adding the given masses together and dividing by 100.

54.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

55.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
56.

Given its reactants, predict the products for the following:

PbCl2 + AgNO3 →

a)

PbAg + ClNO3

b)

Pb3NO + Ag2Cl

c)

PbNO3 + AgCl

d)

Pb(NO3)2 + AgCl

57.

Given its reactants, predict the products for the following (Al is +3):

Al + I2 →

a)

Al2I

b)

AlI

c)

Al3I

d)

AlI3

58.

What is the state of matter symbol for a soluble compound?

a)

(s)

b)

(aq)

c)

(g)

d)

(l)

59.

What is the correct formula for aluminum sulfide?

a)

Al₃S2

b)

Al2S3

c)

AlSO₄

d)

AlSO₃

60.

Name the following: Ni3(PO4)2

a)

Nickel Phosphate

b)

Nickel (III) phosphate

c)

Nickel (II) phosphate

d)

Trinickel diphosphate

61.

What is the name for MgF2 ?

a)

magnesium fluoride

b)

manganese Phosphide

c)

magnesium(III) fluoride

d)

magnesium fluoride(II)

62.
What is the charge on the calcium ion?
a)
1+
b)
2+
c)
2-
d)
1-
63.
What is the name for the NO3- ion?
a)
nitrate ion
b)
nitrite ion
c)
nitrogan ion
d)
nitride ion
64.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

65.

What is the molar mass of NO3

a)

4

b)

14

c)

38

d)

62

66.

If I have .5 moles of a gas at STP, how much area will the gas take up?

a)

11.2 L

b)

22.4 L

67.

What is the percent yield if 71g was found in the lab and the calculated amount was 84g (% yield = actual/calculated and times 100)

a)

118%

b)

72%

c)

84.5%

68.

What volume will 60 g of CO2 occupy?

a)

21.5 L

b)

31.0 L

c)

45 L

d)

64.3 L

69.

What is the molar mass of (NH4)2 SO4?

a)

180 g/mol

b)

250 g/mol

c)

132 g/mol

d)

98 g/mol

70.
Which conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C6H12O6? 
a)
1 mole = 78.12 g
b)
1 mole = 22.4 L 
c)
1 mol = 6.02x 1023 particles 
d)
more than one
71.
4NH3 + 5O2-->4NO + 6H2O
What is the total number of moles of H2O produced when 12 mole of NH3 is completely consumed?
a)
15
b)
18
c)
20
d)
24
72.

What is the molar mass of one mole of HCl?

a)

79.92 grams per mole of HCl

b)

36.46 grams per mole of HCl

c)

35.45 grams per mole of HCl

d)

1.01 grams per mole of HCl

73.
How many moles are in 16.94g of water?
a)
16.94
b)
0.9403
c)
305.2
d)
1.063
74.

What type of Chemical reaction is CaO + H2O --> Ca(OH)2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

75.

When reacting Na with Cl2, we calculated that the theoretical yield should be 12.5 grams. Our actual yield was 13.0 grams. What is the percent yield? (% yield = (Actual/theoretical) X 100)

a)

100%

b)

104%

c)

96%

d)

1.04

76.

Zn + 2HCl → ZnCl​2 ​​+ H​2​​

15 grams of HCl should theoretically produce 0.42 grams of H2. The reaction actually produced 0.15 grams of H2. What is the percent yield of H2? (% yield = (Actual/theoretical) X 100)

a)

2.8%

b)

280%

c)

1%

d)

36%

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