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Final exam Revision Grade 10 - Chemistry

Total questions: 129

Worksheet time: 6hrs 27mins

Name
Class
Date
1.

The reaction in which two compound exchange their ions to form two new compounds is called

a)

displacement reaction

b)

combination reaction

c)

redox reaction

d)

double displacement reaction

2.

In the following equation:

Na2CO3 + xHCI -> 2NaCI +CO2 + H2O, the value of x is

a)

1

b)

2

c)

3

d)

4

3.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
4.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
5.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
6.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
7.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
8.
Is the following reaction balanced?
2CH3OH + 3O2 --> 2CO2 + 4H2O
a)
yes
b)
no
9.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
10.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
11.
When the equation NH3 + O2 --> HNO3 + H2O is completely balanced using smallest whole numbers, the coefficient of O2 would be
a)
1
b)
2
c)
3
d)
4
12.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
13.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
14.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
15.
Balance this equation:
P4+O2  -->  P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
 P4+ O2 --> 2 P2O3
c)
 P4+ 3 O2 --> 2 P2O3
d)
 P4+ 2 O2 --> 3 P2O3
16.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
17.
When the equation
Na + H2O --> NaOH + H2 is correctly balanced using the smallest whole numbers, the coefficient of the water is
a)
1
b)
2
c)
3
d)
4
18.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

19.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

20.
 Mg  +  ___ HCl  →   MgCl2  +   H2
a)
1
b)
2
c)
3
d)
4
21.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
22.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
23.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
24.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
25.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
26.

Fill in the blanks with coefficient:

PCl5+_ H2O→_ HCl+H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

27.
AB + CD →AD + CB
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
28.
Identify this type of reaction,
Cl2 + 2KI -->  I2 + 2KCl
a)
Synthesis
b)
Single displacement
c)
Double displacement
d)
Decomposition
29.
2 C5H5 + Fe --> Fe(C5H5)2 
a)
single displacement
b)
double displacement
c)
decomposition
d)
synthesis
30.
2 RbNO3 + BeF2 --> Be(NO3)2 + 2 RbF
a)
single displacement
b)
double displacment
c)
decomposition
d)
synthesis
31.
Which chemical reaction breaks down into 2 substances?
a)
Double displacement
b)
Single displacement
c)
Synthesis
d)
Decomposition
32.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
33.
Which of the following is the general formula for a decomposition reaction?
a)
A + B  → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
34.
2 AgNO3 + Cu --> Cu(NO3)2 + 2 Ag 
a)
single displacement
b)
double displacement
c)
decomposition
d)
synthesis
35.
A + BC →B + AC
a)
Single Replacement
b)
Decomposition
c)
Double Replacement
d)
Synthesis
36.
NO2 →N2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
37.
Mg + N2 →Mg3N2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
38.
2NaCl →2Na +Cl2
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
39.
 C + O2 → CO2
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
40.
The following is what type of reaction:
NH3 + HCl  → NH4Cl
a)
Synthesis
b)
Decomposition
c)
Single Replacement Replacement
d)
Double Replacement Replacement
41.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
42.

The reaction XY ⟶ X + Y is an example of _____.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

43.

What class of reaction best describes the equation below?

Zn + H2S ⟶ ZnS + H2

a)

synthesis

b)

combustion

c)

single replacement

d)

double replacement

44.

What class of reaction best describes the equation below?

CH4 + O2 ⟶ CO2 + H2O

a)

single replacement

b)

double replacement

c)

decomposition

d)

combustion

45.

What class of reaction best describes the equation below?

FeS + HCl ⟶ H2S + FeCl2

a)

synthesis

b)

combustion

c)

single replacement

d)

double replacement

46.

What class of reaction best describes the reaction

Mg + HCl ⟶ MgCl2 + H2

a)

combustion

b)

synthesis

c)

decomposition

d)

single replacement

47.

What class of reaction best describes the equation below?

MgCO3 ⟶ MgO + CO2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

48.

Which of the following chemical equations is an example of a combustion reaction?

a)

2Al2O3 ⟶ 4Al + 3O2

b)

2C5H10 + 15O2 ⟶ 10CO2 + 10H2O

c)

2MgCl2 + Na2CO3 ⟶ 2 NaCl + MgCO3

d)

K2O + H2O ⟶ 2 KOH

49.

Which of the following chemical equations is an example of a double replacement reaction?

a)

2Al2O3 ⟶ 4Al + 3O2

b)

2C5H10 + 15O2 ⟶ 10CO2 + 10H2O

c)

2MgCl2 + Na2CO3 ⟶ 2 NaCl + MgCO3

d)

K2O + H2O ⟶ 2 KOH

50.

Which of the following is an example of a decomposition reaction?

a)

2NaF ⟶ 2 Na + F2

b)

P2O5 + 3 H2O ⟶ 2H3PO4

c)

2FeCl3 + 3Zn ⟶ 2Fe + 3ZnCl2

d)

C6H12O6 + 6O2 ⟶ 6CO2 + 6 H2O

51.

Which of the following is an example of a single replacement reaction?

a)

2NaF ⟶ 2 Na + F2

b)

P2O5 + 3 H2O ⟶ 2H3PO4

c)

2FeCl3 + 3Zn ⟶ 2Fe + 3ZnCl2

d)

C6H12O6 + 6O2 ⟶ 6CO2 + 6 H2O

52.

Which of the following is an example of a synthesis reaction?

a)

Cl2 + 2NaBr ⟶ 2NaCl + Br2

b)

MgO + CO2 ⟶ MgCO3

c)

FeBr3 + K3PO4 ⟶ FePO4 + 3KBr

d)

2Na2O2 ⟶ 2Na2O + O2

53.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

What type of reaction is illustrated above?

a)

Synthesis/Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

54.

N2 + 2 O2 → N2O4

What type of reaction is illustrated above?

a)

Synthesis/Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

55.

CH4 + 2 O2 → CO2 + 2 H2O

What type of reaction is illustrated above?

a)

Synthesis/Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

56.

8 Fe + S8 → 8 FeS

What type of reaction is illustrated above?

a)

Synthesis/Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

57.

PbO2 → Pb + O2

What type of reaction is illustrated above?

a)

Synthesis/Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

58.

Predict the results of: NaI + Br2

a)

Na2Br + I

b)

NaBr2 + I

c)

NaBr + I2

59.

Based on the activity series, what are the predicted products of this reaction?

Br2 (l) + KI (aq) →

a)

KBr + I2

b)

KBr + I

c)

KBr2 + I

d)

No Reaction

60.
Based on the activity series, which metal could X represent in the reaction below?
X + Ca (NO3)2 -->  Ca + X (NO3)2
a)
Ba
b)
Fe
c)
Mg
d)
Zn
61.
 A lone pair is defined as
a)
A pair of bonding electrons
b)
One non-bonding electron
c)
A pair of non-bonding electrons
d)
A pair of electrons on the central atom
62.
According to VSEPR, molecules adjust their shapes to keep which of the following as far away as possible?
a)
Pairs of valence electrons
b)
Inner shell electrons
c)
Mobile Electrons
d)
Electrons closest to the nucleus
63.
Who could this molecule be?
a)
CH4
b)
CO2
c)
PCl5
d)
BF3
64.
Which molecule below would have this shape?
a)
BF3
b)
CH4
c)
PCl5
d)
CO2
65.
VSEPR stands for ________ theory.
a)
Valence Structure of Electron Pyramids and Regression
b)
Varied Structures of Electrons Paired and Replaced
c)
Varied Shell Energy of Protons and Radiation
d)
Valence Shell Electron Pair Repulsion
66.

What would be the bond angle between atoms in this molecule?

a)

180

b)

120

c)

90

d)

109.5

67.

What would be the bond angle between atoms in this molecule?

a)

109.5

b)

120

c)

180

d)

90

68.

What shape would a molecule have if it has 2 bonded pairs and 1 lone pair around its central atom? (It may help if you sketch this out)

a)

Linear

b)

Trigonal planar

c)

Tetrahedral

d)

Bent

69.

What 3-D shape would this molecule have: H2S ?

a)

bent

b)

tetrahedral

c)

linear

d)

trigonal pyramidal

70.

What is the name of this molecular shape?

a)

trigonal pyramid

b)

tetrahedral

c)

bent

d)

trigonal planar

71.

What 3-D shape would this molecule have?

a)

Trigonal planar

b)

Pyramidal

c)

Tetrahedral

d)

Bent

72.

What 3-D shape would this molecule have?

a)

tetrahedral

b)

trigonal planar

c)

trigonal pyramid

d)

bent

73.

What would be the bond angle between atoms in this molecule?

a)

90

b)

120

c)

180

d)

109.5

74.

What shape would a molecule have if it has 4 bonded pairs around its central atom? (It may help if you sketch this out)

a)

Linear

b)

Trigonal planar

c)

Tetrahedral

d)

Bent

75.
Choose the correct shape for this molecule:
a)
Trigonal planar
b)
Trigonal pyramidal
c)
Tetrahedral
d)
Linear
76.
 A lone pair is defined as
a)
A pair of bonding electrons
b)
One non-bonding electron
c)
A pair of non-bonding electrons
d)
A pair of electrons on the central atom
77.

What is the hybridization of a linear molecule?

a)

sp

b)

sp2

c)

sp3

d)

sp3d

78.

Which of the following images represents a Trigonal Planar molecular geometry?

a)
b)
c)
d)
79.

What is the hybridization of this molecule shown above

a)

sp

b)

sp2

c)

sp3

d)

sp4

80.

Which of the following is octahedral?

a)

SCl6

b)

XeI4

c)

NBr5

d)

CH4

81.

Which of the following hybrid orbitals is used by the central atom for bonding in CO32-?

a)

sp2

b)

sp3

c)

sp3d

d)

sp3d2

82.

The molecule that uses sp3d hybrid orbital on the central atom is

a)

BCl3

b)

NCl3

c)

ICl3

d)

PCl3

83.

What is the hybridization of PF5?

a)

sp3

b)

sp3d

c)

sp3d2

d)

sp2

84.

What is the hybridization of a linear molecule?

a)

sp

b)

sp2

c)

sp3

d)

sp3d

85.

What is the hybridization of the central atom of a bent molecule? (AB2E2)

a)

sp

b)

sp2

c)

sp3

d)

sp3d

86.
What is the definition of molar mass?
a)
number of grams per one mole of a substance
b)
whole number ratio that is a multiple of a chemical formula
c)
simplest, whole number ratio of a chemical formula
d)
6.02 x 10^23 particles per one mole of a substance
87.
Molar mass is in units of ________.
a)
grams
b)
grams/mole
c)
mole
d)
moles/gram
88.
What is the molar mass of AuCl3?
a)
96 g
b)
130 g
c)
232.5 g
d)
303.3 g
89.
What is the definition for Avogadro's number?
a)
number of grams per one mole of a substance
b)
whole number ratio that is a multiple of a chemical formula
c)
simplest, whole number ratio of a chemical formula
d)
6.02 x 10^23 particles per one mole of a substance
90.
Which would have more atoms?
a)
1 mole of Li
b)
1 mole of Au
c)
1 mole of Si
d)
None, all are equal
91.
Which represents the greatest mass of sulfur?
a)
1 gram of sulfur
b)
1 molecule of sulfur
c)
0.5 mole of sulfur
d)
6.02 x 1023 atoms of sulfur
92.
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
93.
What is the mass in grams of 5.90 mol C8H18?
a)
.0512 g
b)
19.4 g
c)
673 g
d)
389 g
94.
What is the mass of 2.50 mol of oxygen gas O2?
a)
40 g
b)
80 g
c)
16 g
d)
32 g
95.
How many water molecules are in 5.2 moles of water?
a)
6.02 x 1023
b)
5.2
c)
3.1304 x 1024
d)
8.638 x 10-24
96.

How many atoms are present in a 13.5 gram sample of beryllium?

a)

1.5 particles

b)

9 particles

c)

4.03 x1023 particles

d)

9.02 x1023 particles

97.

A sample of silver contains 5.71 x 1022 atoms. How many moles of silver are present?

a)

3.43 x 1046 moles

b)

0.0529 moles

c)

0.0948 moles

d)

10.5 moles

98.

How many atoms are present in a 0.0254 mole sample of gold?

a)

0.25 atoms

b)

1.528 x 1022 atoms

c)

4.22 x 10-25 atoms

d)

5 atoms

99.

What is the molar mass of calcium hydroxide, Ca(OH)2?

a)

74.1 g/mole

b)

57.1 g/mole

c)

58.1 g/mole

d)

57.1 u

100.

What is the molar mass of Zn(C2H3O2)2?

a)

392.8g/mol

b)

142.9g/mol

c)

361g/mol

d)

183.5 g/mol

101.

Determine the mass of 2.40 moles of C6H12

a)

201 g

b)

115 g

c)

230. g

d)

353 g

102.

What is the total mass, in grams, of a 0.75 mole sample of SO2?

a)

16 g

b)

24 g

c)

32 g

d)

48 g

103.
Calculate the mass of iron in a sample of iron ore containing 2.61x1023 iron atoms.
a)
0.433g
b)
24.2g
c)
44g
d)
6.02g
104.

How many molecules are present in a 135 g sample of Teflon, which has a formula of C2F4?

a)

6.13 x 1023 molecules

b)

5.13 x 1023 molecules

c)

8.13 x 10 23 molecules

d)

9.13 x 1023 molecules

105.

The chemical formula Mg(NO3)2 indicates that there are

a)

one Mg, two N, three O

b)

one Mg, two N, five O

c)

two Mg, two N, six O

d)

two Mg, one N, five O

e)

one Mg, two N, six O

106.

Calculate the molar mass of (NH4)2S

a)

54.14 g/mol

b)

68.16 g/mol

c)

50.11 g/mol

d)

73.44 g/mol

107.

Calculate the molar mass of Mg3(PO4)2

a)

81.69 g/mol

b)

231.90 g/mol

c)

262.87 g/mol

d)

166.44 g/mol

108.

What is the mass of 0.250 moles of CaCl2?

a)

27.8 g

b)

44.4 g

c)

0.00225 g

d)

8.44 g

109.

How many moles of KBr are there in 0.25 g of the compound?

a)

29.75 mol

b)

0.0021 mol

c)

0.25 mol

d)

2.3 mol

110.
The number 6.02 x 1023 is called...
a)
Obama's number
b)
Bohr's number
c)
Trump's number
d)
Avogadro's number
111.
How many atoms of iodine are in a mole of iodine?
a)
53
b)
63.55g
c)
126.9
d)
6.02 x 1023
112.
What is the molar mass of NaCl?
a)
58.45g/mol
b)
28g/mol
c)
12g/mol
d)
6.02 x 1023
113.
Avogadro's number of representative particles is equal to one_____.
a)
kilogram
b)
gram
c)
kelvin
d)
mole
114.
How many moles are in 16.94g of water?
a)
16.94 mol H2O
b)
0.9401 mol H2O
c)
305.3 mol H2O
d)
1.063 mol H2O
115.
How many moles are in 19.82 g Mg? 
a)
1.226mol Mg
b)
481.7mol Mg
c)
1.000mol Mg
d)
 0.8156 mol Mg
116.
How many particles (atoms) would be in 8.4 moles of Octane (C8H18)?
a)
5.77 x 1023
b)
5.04 x 1024
c)
5.77 x 1026
d)
5.04 x 1023
117.
How many atoms are in 3.5 moles of arsenic atoms?
a)
5.8 x 10-24
b)
7.5 x 101
c)
2.1 x 1024
d)
1.7 x 1023
118.
How many molecules of sugar (atoms of sugar) (C6H12O6) are in a mole of sugar?
a)
24 molecules
b)
180 molecules
c)
180 g
d)
6.02 x 1023 molecules
119.
How many atoms are in 6.3 mol Zn?
a)
6.0x1023atoms Zn
b)
3.8x1024atoms Zn
c)
1.0x10-23atoms Zn
d)
410atoms Zn
120.
How many Carbon Atoms are in 4.52 moles of Carbon?
a)
6.02 x 1023
b)
1.33 x 1023
c)
4.52
d)
2.72 x 1024
121.
How many moles of Na contain 1.45x1021 atoms of Na?
a)
8.73x1044
b)
1.20x1024
c)
0.00241
d)
1.45
122.
How many water molecules are in 5.2 moles of water?
a)
6.02 x 1023
b)
5.2
c)
3.1304 x 1024
d)
8.638 x 10-24
123.
0.75 mole of copper is equal to how many atoms?
a)
8.03 x 10^23
b)
6.02 x 10^23
c)
4.51^x 10^23
d)
3.11 x 10^23
124.
5.11 x 10 23 atoms of lithium is equal to how many moles?
a)
1.18
b)
0.351
c)
1.34
d)
0.849
125.

Molar mass of NaOH is _______________?

(Mr's of each element: Na = 23g, O = 16g, H = 1g)

a)

40 grams/mol

b)

50 grams/mol

c)

45 grams/mol

d)

38 grams/nol

126.

How many moles are there in 12.7g of CaF2?

(CaF2 Molar mass = 78.07 g/mol)

a)

0.20 mol

b)

1,000.76 mol

c)

6.14 mol

d)

0.16 mol

127.

Moles of H2PO4 in 20g?

(Molar mass of H2PO4 = 96.987 g.mol)

a)

0.206 mol

b)

0.103 mol

c)

0.412 mol

d)

8 mol

128.
How many moles are in 8.30 X 1023 molecules of H2O?
a)
1.38 X 1023 moles H2O
b)
1.38 moles H2O
c)
2 moles H2O
d)
138 moles H2O
129.
How many atoms are in 1.50 moles of Hg?
a)
9.03x1023 atoms Hg
b)
9.03x1024 atoms Hg
c)
903 atoms of Hg
d)
9.03 atoms of Hg

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