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3rd Six Weeks Review

Total questions: 87

Worksheet time: 1hrs 29mins

Name
Class
Date
1.

What is the molar mass of CO (carbon monoxide)?

a)

12

b)

16

c)

38

d)

28

2.

How many iron, nitrogen and oxygen atoms are there in Fe(NO3)3?

a)

3 iron atoms, 3 nitrogen atoms and 6 oxygen atoms

b)

3 iron atoms, 3 nitrogen atoms and 9 oxygen atoms

c)

1 iron atom, 1 nitrogen atom and 3 oxygen atoms

d)

1 iron atom, 3 nitrogen atoms and 9 oxygen atoms

3.

What is the molar mass of Fe(NO3)3?

a)

118

b)

86

c)

214

d)

242

4.

Sodium reacts with chlorine to form sodium chloride.

__Na + Cl2 → 2NaCl

What is the missing number needed to balance the equation?

a)

1

b)

2

c)

3

d)

4

5.

Calculate the mass of 0.25 mol of carbon dioxide molecules.

a)

33 g

b)

11 g

c)

12 g

d)

16 g

6.

Calculate the number of moles of water molecules in 36 g of water.

a)

2 mol

b)

0.5 mol

c)

18 mol

d)

16 mol

7.

What is the relative formula mass of Mg(OH)2?

a)

41

b)

39

c)

42

d)

58

8.

How many moles of oxygen atoms are in 31.998 grams of oxygen?

To solve this problem you should...

a)

multiply by 1 mole6.022x1023\frac{1\ mole}{6.022x10^{23}}  

b)

multiply by  1 mole15.999 g\ \frac{1\ mole}{15.999\ g}  

c)

multiply by 6.022x10231 mole\frac{6.022x10^{23}}{1\ mole}  

d)

multiply by 15.999 g1 mole\frac{15.999\ g}{1\ mole}  

9.

How many moles of oxygen atoms are in 3.011 x 10^23 atoms of oxygen?

To solve this problem you should...

a)

multiply by 1 mole6.022x1023\frac{1\ mole}{6.022x10^{23}}  

b)

multiply by  1 mole15.999 g\ \frac{1\ mole}{15.999\ g}  

c)

multiply by 6.022x10231 mole\frac{6.022x10^{23}}{1\ mole}  

d)

multiply by 15.999 g1 mole\frac{15.999\ g}{1\ mole}  

10.
The molar mass of an element is the mass of one ____ of the element.
a)
atom
b)
molecule
c)
mole
d)
gram
11.
How many moles of carbon atoms are there in 5g of carbon?
a)
60 mol
b)
17 mol
c)
0.42 mol
d)
7 mol
12.
How many moles are in 4.5x1024 particles?
a)

7.47 particles

b)

7.47mol

c)
2.71x1047 mol
d)
2.71x1047 particles
13.

How many molecules are in 150.0g of Na2SO4?

a)

9.03x1025 molecules

b)

1.056 molecules

c)

6.357x1023 molecules

d)

5.701x1023 molecules

14.

Find the mass in grams of 6.022 x 10236.022\ x\ 10^{23}    molecules of diatomic fluorine gas . Round to the hundredths place (2 decimal places). Enter only the number.

(a)  

15.

Which of the following dimensional analysis setups will correctly convert 4.00x1023atoms of cobalt to moles of cobalt? How many moles of colbalt are there?

a)

setup B : 0.664 mol Co

b)

setup A: 2.41x1047mol Co

c)

setup A : 0.664 mol Co

d)

setup B: 2.41x1047mol Co

16.

Standard temperature and pressure (STP) mean

a)

A temperature of 0°C and a pressure of 101.3 kPa, or 1 atmosphere (atm).

b)

A temperature of 100°C and a pressure of 101.3 kPa, or 1 atmosphere (atm).

c)

A temperature of 0°K and a pressure of 10 atmosphere (atm).

17.

At STP, 1 mol, or representative particles, of any gas occupies a volume of......................

a)

24.4 L

b)

44.2 L

c)

22.4 L.

18.

The quantity, 22.4 L, is called the ______ of a gas.

a)

molar volume

b)

molar mass

c)

Atomic volume

19.

What is the volume of 3 moles of hydrogen gas at STP?

a)

22.4 L

b)

24 L

c)

67.2 L

d)

89.6 L

20.

Which of the following choices best describes the number of particles found in 3 moles of copper?

a)

2.408 x 1024 Particles

b)

1.806 x 1024 Particles

c)

1.204 x 1024 Particles

d)

6.02 x 1023 Particles

21.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
22.
Which of the following is considered an empirical formula?
a)
CH3COOH
b)
C6H12O6
c)
H2O
23.
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.
a)
SO
b)
SO2
c)
SO3
d)
SO4
24.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
25.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
26.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula 
d)
Distance Formula
27.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)

C2H3O2

b)

CH2O

c)

C2H4O2

d)

C3H8O3

28.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.


What is the empirical formula of J?

a)

C4HNO2

b)

CH2N2O

c)

C2HNO2

d)

CHNO

29.
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
a)
 NaPO2
b)
Na2PO3
c)
Na3PO4
d)
NaPO4
30.

Which one is the empirical formula?

C4H6

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

31.

Carbon monoxide, a deadly gas, has a chemical formula of CO (one carbon atom with one oxygen atom). If you look at the total atomic mass of CO, does carbon or oxygen make up more of the mass?

a)

carbon

b)

oxygen

c)

they are exactly the same

d)

it is impossible to tell

32.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?

a)

29%

b)

43%

c)

57%

d)

73%

33.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?

a)

29%

b)

43%

c)

57%

d)

73%

34.

Magnesium bromide (one magnesium atom with two bromine atoms) has a chemical formula of MgBr2. If you look at the total atomic mass of MgBr2, does magnesium or bromine make up more of the mass?

a)

bromine

b)

magnesium

c)

they are exactly the same

d)

it is impossible to tell

35.

What percentage of the total atomic mass of magnesium bromide (MgBr2) is composed of magnesium?

a)

13%

b)

43%

c)

63%

d)

87%

36.

What percentage of the total atomic mass of magnesium bromide (MgBr2) is composed of bromine? Hint - consider the mass of both atoms of bromine in your calculation.

a)

13%

b)

43%

c)

63%

d)

87%

37.

Lithium phosphide (three lithium atoms with one phosphorus atom) has a chemical formula of Li3P. If you look at the total atomic mass of Li3P, does lithium or phosphorus make up more of the mass?

a)

lithium

b)

phosphorus

c)

they are exactly the same

d)

it is impossible to tell

38.

What percentage of the total atomic mass of lithium phosphide (Li3P) is composed of lithium? Hint - consider all three atoms of lithium in your calculation.

a)

13%

b)

29%

c)

40%

d)

60%

39.

What percentage of the total atomic mass of lithium phosphide (Li3P) is composed of phosphorus?

a)

13%

b)

29%

c)

40%

d)

60%

40.

What percentage of the total atomic mass of calcium nitrate (Ca(NO3)2) is composed of nitrogen? Hint - another way to think of calcium nitrate is Ca(NO3)(NO3).

a)

17%

b)

24%

c)

29%

d)

59%

41.

A chemical reaction is a process in which

a)

all reactants change state

b)

products change into reactants

c)

the law of conservation of mass applies

42.

How can a chemical equation be balanced?

a)

changing subscripts

b)

erasing elements as necessary

c)

adding coefficients

d)

adding elements as necessary

43.

What are the products in the equation?

a)

Zn and CuSO4

b)

Zn and Cu

c)

ZnSO4 and Cu

d)

Zn only

44.

The following are the evidences that chemical reaction took place, EXCEPT:

a)

evolution of gas

b)

formation of precipitate

c)

formation of new element

d)

change in the intrinsic properties

45.

What type of reaction is present in the unbalanced equation, NaOH + KNO3 ---> NaNO3 + KOH

a)

combination

b)

decomposition

c)

double replacement

d)

combustion

46.

What type of reaction is present in the unbalanced equation, Fe + NaBr --> FeBr3 + Na

a)

combustion

b)

single replacement

c)

double replacement

d)

acid-base

47.

Which of the following best describes the combustion reaction?

a)

hydrocarbon combines with oxygen to produce CO2 and H2O

b)

hydrogen combines with CO2 to produce O2 and H2O

c)

hydrocarbon combines with H2O to produce CO2 and O2

d)

CO2 combines with oxygen to produce hydroxide and H2O

48.

Chemical equations are balanced by placing the appropriate

___________ before the symbols or formulas of reactants and

products.

a)

subscript

b)

exponent

c)

letter

d)

coefficient

49.

Which of the following is the balanced equation for Zn + HCl --> ZnCl2 + H2?

a)

Zn + HCl --> 2ZnCl2 + H2

b)

Zn + 2HCl --> ZnCl2 + H2

c)

2Zn + HCl --> 2ZnCl2 + H2

d)

Zn + 2HCl --> 2ZnCl2 + H2

50.

Which of the following sets of coefficients can be used to balance the equation, CH4 + O2 --> CO2 + H2O

a)

1,1,2,1,

b)

1,2,1,2

c)

2,1,2,1

d)

2,2,1,1

51.

Which of the following is a balanced reaction?

a)

2C3H8 + 10 O2 → 6CO2 + 8H2O

b)

C3H8 + O2 → CO2 + H2O

c)

C3H8 + O2 → 3CO2 + 2H2O

d)

C3H8 + 5O2 → 3CO2 + 4H2O

52.

Quicklime ( CaO ) is used as a drying agent. When water is added to this, slaked lime Ca(OH)2 is formed. What type of reaction is this?

a)

combination

b)

single displacement

c)

decomposition

d)

double displacement

53.

Which of the following chemical reaction shows the production of water from hydrogen gas and oxygen gas?

a)

2 H2O → 2 H2 + O2

b)

2 H2 + O2 → 2 H2O

c)

3 H2 + O2 → 3 H2O

d)

3 H2O → H2 + 3 O2

54.

Which of the following sets of coefficients can be used to balance the equation, Al + O2 --> Al2O3

a)

2,3,2

b)

2,3,4

c)

4,3,2

d)

2,1,4

55.

The Law of Conservation of Mass states that in a chemical reaction,

a)

mass of the reactants and mass of the products are equal

b)

new elements are formed

c)

new atoms are created

d)

atoms are destroyed

56.

Which option is correctly balanced?

a)

Fe + H2O --> Fe3O4 + H2

b)

3 Fe + H2O --> Fe3O4 + H2

c)

3 Fe + 4 H2O --> Fe3O4 + 4 H2

d)

3 Fe + 2 H2O --> Fe3O4 + H2

57.

Which Option is Correctly Balanced?

a)

Hg + O2 --> Hg2O2

b)

2 Hg + 2O2 --> Hg2O2

c)

2 Hg + O2 --> Hg2O2

d)

Hg + 2 O2 --> Hg2O2

58.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
59.

What are the coefficients that will balance the skeleton equation below?

__Na + __F₂ → __NaF

a)

1, 2, 1

b)

2, 1, 2

c)

1,1,1

d)

2,2,2

60.

What number do I need to balance the following chemical reaction?

C4H8+C_4H_8+  _ O2→4CO2+4H2OO_2\rightarrow4CO_2+4H_2O  

a)

2

b)

4

c)

6

d)

8

61.
What are the products of this reaction?
Cu+ AgNO3--> 
a)
Cu(NO3)2+Ag
b)
CuNO3 + Ag
c)
CuAg+NO3
d)
Cu+ AgNO3
62.
Predict the products for the this reaction:
K + HCl --> 
a)
KCl + H2
b)
KHCl 
c)
KH + Cl2
d)
KCl + H
63.
Which of the following equations represents the balanced synthesis reaction of iron (III) and oxygen?
a)
Fe + 3 O2 → Fe2O3
b)
3 Fe + 3 O2 → 2 Fe2O3
c)
2 Fe + O2 → Fe2O3
d)
4 Fe + 3 O2 → 2 Fe2O3
64.
If an element is diatomic it should have a subscript of___
a)
2, always
b)
2, only when it is by itself
c)
it shouldn't have a subscript, it should have a coefficent
65.
What kind of reaction is this:
Fe + CuSO4 -> Cu + FeSO4
a)
Double Replacement
b)
Decompostion
c)
Single Replacement
d)
Combustion
66.
What is the product when rubidium and oxygen gas react?
a)
RbO2
b)
Rb2O
c)
RbO
d)
Rb2O2
67.
 Predict the product(s):  H2O -->
a)
H and O
b)
H2 and O2
c)
H and OH
68.
Which of the following are PRODUCTS?
H2O + CO2 → HCO + HO
a)
H2O and CO2
b)
HCO and HO
c)
H2O ONLY
d)
HCO ONLY
69.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement 
b)
decomposition 
c)
combustion 
d)
single replacement
70.

To determine whether a single replacement reaction will happen, one must consult

a)

a lexicon

b)

the activity series

c)

a solubility chart

d)

One Thousand Magical Herbs and Fungi by Phyllida Spore

71.

Predict the product of the following synthesis reaction.

Ca + N2 -->

a)

CaN2

b)

CaN

c)

Ca3N2

d)

CaNNot

72.

What is the charge of Iron in this compound. (Hint: think swap drop method):

Fe3(PO4)2

a)

3+

b)

2+

c)

1+

d)

6+

73.

What is a useful tool in determining if a single-replacement reaction will happen?

a)

The periodic table

b)

The ion lists

c)

Activity Series of Metals

d)

A calculator

74.

Using the Activity Series of Metals, explain the outcome of this reaction.

a)

No reaction because Fe is lower on the list than Cu and less reactive.

b)

No reaction will occur because Cu is lower on the list than Fe and less reactive.

c)

Yes, there will be a reaction. Cu will replace Fe.

d)

It cannot be determined if this reaction will happen.

75.

The oxidation state of selenium in NaSeO₃ is

a)

+5

b)

+3

c)

+7

d)

-5

76.

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

a)

reduced

b)

oxidized

c)

electrolyzed

d)

synthesized

77.

In the reaction N₂(g) + 3 H₂(g) --> 2 NH₃(g), nitrogen is __________.

a)

reduced

b)

oxidized

c)

electrolyzed

d)

synthesized

78.

Oxygen usually has an oxidation number of ___ when it is combined with other elements in a compound.

a)

+6

b)

-6

c)

+2

d)

-2

79.

Elements not combined with other elements in a compound have an oxidation number of ____.

a)

Depends on their group on the periodic table

b)

+1

c)

0

d)

= to the number of valence elections

80.

Oxidation is the loss of electron, meaning, there is an increase of oxidation number

a)

True

b)

False

81.

The species that loses electron is _____ and usually _____ agent.

a)

oxidized;reducing

b)

reduced;oxidizing

c)

oxidized;oxidizing

d)

reduced;reducing

82.

Determine the oxidation state of N in NH3NH_3  

a)

+3

b)

-5

c)

+5

d)

-3

83.

Determine the oxidation state of Cl in Cl2O7Cl_2O_7  

a)

-1

b)

+7

c)

+1

d)

-7

84.

Reaction between nitric acid and sodium hydroxide is a redox reaction.

a)

TRUE

b)

FALSE

85.

Reaction between lead nitrate and sodium sulphate produces lead sulphate and sodium nitrate. Therefore, this reaction is a redox reaction

a)

TRUE

b)

FALSE

86.

Chemical equation : Zn + CuO --> ZnO + Cu

which statements are true?

a)

Copper ion undergoes oxidation

b)

Zinc metal undergoes oxidation

c)

Oxidation number of zinc increases from 0 to +2

d)

Copper ion in CuO acts as oxidizing agent.

87.

Half equation : Br2 + 2e- --> 2Br-

Which statement is correct?

a)

Bromine undergoes oxidation

b)

Bromine undergoes reduction

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