WorksheetsLab Chemistry Review- Final Exam
Total questions: 72
Worksheet time: 53mins
Name
Class
Date
1.
What is the term for a solid that forms and settles out of a liquid mixture during a chemical reaction?
a)
a precipitate.
b)
a solute.
c)
a solvent.
d)
a catalyst.
2.
Once the correct formula for a product in a chemical equation is written, the
a)
subscripts should be changed to balance the equation.
b)
formula must remain unchanged.
c)
same formula must be used for the reactant.
d)
symbols in the formula must not be used on the reactant side of the equation.
3.
In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is
a)
H
b)
H₂
c)
2H
d)
OH
4.
What is the whole number that appears in front of a formula in a chemical equation?
a)
a subscript
b)
a ratio
c)
a superscript
d)
a coefficient
5.
To balance a chemical equation, it may be necessary to adjust the
a)
coefficients
b)
formulas of the products
c)
subscripts
d)
number of products
6.
According to the law of conservation of mass, the total mass of the reacting substances is
a)
always more than the total mass of the products.
b)
always less than the total mass of the products.
c)
sometimes more and sometimes less than the total mass of the products.
d)
always equal to the total mass of the products.
7.
A chemical equation is balanced when the
a)
coefficients of the reactants equal the coefficients of the products.
b)
same number of each kind of atom appears in the reactants and in the products.
c)
products and reactants are the same chemicals.
d)
subscripts of the reactants equal the subscripts of the products.
8.
Which word equation represents the reaction that produces water from hydrogen and oxygen?
a)
Water is produced from hydrogen and oxygen.
b)
Hydrogen plus oxygen yields water.
c)
H₂ + O₂ -> water.
d)
Water can be separated into hydrogen and oxygen.
9.
How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water?
a)
oxygen
b)
O₂
c)
O₃
d)
O
10.
For the formula equation 2Mg + O₂ --> 2MgO, the word equation would begin
a)
Manganese plus oxygen . . .
b)
Molybdenum plus oxygen . . .
c)
Magnesium plus oxygen . . .
d)
Heat plus oxygen . . .
11.
In an equation, the symbol for a substance in water solution is followed by
a)
(l).
b)
(g).
c)
(aq).
d)
(s).
12.
When the equation Fe₃O₄ + Al --> Al₃O₃ + Fe is correctly balanced, what is the coefficient of Fe?
a)
3
b)
4
c)
6
d)
9
13.
Which coefficients correctly balance the formula equation NH₄NO₂(s) --> N₂(g) + H₂O(l)?
a)
1, 2, 2
b)
1, 1, 2
c)
2, 1, 1
d)
2, 2, 2
14.
Which coefficients correctly balance the formula equation CaO + H₂O --> Ca(OH)₂ ?
a)
2, 1, 2
b)
1, 2, 3
c)
1, 2, 1
d)
1, 1, 1
15.
In what kind of reaction do two or more substances combine to form a new compound?
a)
decomposition reaction
b)
ionic reaction
c)
double-replacement reaction
d)
synthesis reaction
16.
The equation AX --> A + X is the general equation for a
a)
synthesis reaction
b)
combustion reaction
c)
decomposition reaction
d)
single-replacement reaction
17.
In what kind of reaction does one element replace a similar element in a compound?
a)
synthesis reaction
b)
combustion reaction
c)
double-replacement reaction
d)
single-replacement reaction
18.
The equation AX + BY --> AY + BX is the general equation for a
a)
synthesis reaction
b)
combustion reaction
c)
double-replacement reaction
d)
single-replacement reaction
19.
The reaction 2Mg(s) + O₂(g) --> 2MgO(s) is a
a)
synthesis reaction
b)
decomposition reaction
c)
double-replacement reaction
d)
single-replacement reaction
20.
The reaction Mg(s) + 2HCl(aq) --> H₂(g) + MgCl₂(aq) is a
a)
synthesis reaction
b)
decomposition reaction
c)
double-replacement reaction
d)
single-replacement reaction
21.
The reaction Pb(NO3)₂(aq) + 2KI(aq) --> PbI₂(s) + 2KNO₃(aq) is a
a)
synthesis reaction
b)
decomposition reaction
c)
double-replacement reaction
d)
single-replacement reaction
22.
In the equation 2Al(s) + 3Fe(NO3)₂(aq) --> 3Fe(s) + 2Al(NO3)₃(aq), iron has been replaced by
a)
nitrate
b)
water
c)
aluminum
d)
nitrogen
23.
What is the balanced equation when aluminum reacts with copper(II) sulfate?
a)
Al + Cu₂S --> Al₂S + Cu
b)
2Al + 3CuSO₄ --> Al₂(SO4)₃ + 3Cu
c)
Al + CuSO₄ --> AlSO₄ + Cu
d)
2Al + Cu₂SO₄ --> Al₂SO₄ + 2Cu
24.
A chemical formula includes the symbols of the elements in the compound and subscripts that indicate
a)
the number of moles in each element.
b)
how many atoms or ions of each type are combined in the simplest unit.
c)
the formula mass.
d)
the charges on the elements or ions.
25.
How many atoms of fluorine are present in a molecule of carbon tetrafluoride, CF₄?
a)
1
b)
2
c)
4
d)
5
26.
What is the formula for zinc fluoride?
a)
ZnF
b)
ZnF₂
c)
Zn₂F
d)
Zn₂F₃
27.
What is the formula for aluminum sulfate?
a)
AlSO₄
b)
Al₂SO₄
c)
Al₂(SO₄)₃
d)
Al(SO₄)_
28.
What is the formula for barium hydroxide?
a)
BaOH
b)
BaOH₂
c)
Ba(OH)₂
d)
Ba(OH)
29.
Name the compound Zn₃(PO₄)₂.
a)
zinc potassium oxide
b)
trizinc polyoxide
c)
zinc phosphate
d)
zinc phosphite
30.
Name the compound Hg₂(NO₃)₂.
a)
mercury(II) nitrate
b)
dimercury dinitrate
c)
mercury(I) nitrate
d)
mercuric nitrate
31.
Name the compound CuCO_.
a)
copper(I) carbonate
b)
cupric trioxycarbide
c)
cuprous carbide
d)
copper(II) carbonate
32.
What is the metallic ion in copper(II) chloride?
a)
Co²⁺
b)
Cl²⁻
c)
Cu²⁺
d)
Cl⁻
33.
Name the compound SiO₂.
a)
silver oxide
b)
silicon oxide
c)
silicon dioxide
d)
monosilicon dioxide
34.
Which compound's name includes the Greek numerical prefixes di- and tri-?
a)
Fe₂O₃
b)
Ca₃(PO₄)₂
c)
N₂O₃
d)
Al₂S₃
35.
What is the formula for dinitrogen trioxide?
a)
Ni₂O₃
b)
NO₃
c)
N₂O₆
d)
N₂O₃
36.
The electrons involved in the formation of a chemical bond are called
a)
dipoles.
b)
s electrons.
c)
Lewis electrons.
d)
valence electrons.
37.
The chemical bond formed when two atoms share electrons is called a(n)
a)
ionic bond
b)
orbital bond
c)
Lewis Structure
d)
covalent bond
38.
An octet is equal to..
a)
2
b)
4
c)
5
d)
8
39.
The elements of the ____ group satisfy the octet rule without forming compounds.
a)
main
b)
noble gas
c)
alkali metal
d)
alkaline-earth metal
40.
In drawing a Lewis structure, each nonmetal atom except hydrogen should be surrounded by
a)
2 electrons
b)
4 electrons
c)
8 electrons
d)
10 electrons
41.
In the choices below, what is the Lewis structure for hydrogen chloride, HCl?
a)
A
b)
B
c)
C
d)
D
42.
In the choices below, what is the Lewis structure for carbon tetraiodide, which contains one carbon atom and
four iodine atoms?
a)
A
b)
B
c)
C
d)
D
43.
For the reaction N₂ + 3H₂ --> 2NH₃, how many moles of nitrogen are required to produce 18 mol of ammonia?
a)
9.0 mol
b)
18 mol
c)
27 mol
d)
36 mol
44.
For the reaction Cl2 + 2KBr --> 2KCl + Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide?
a)
0.119 mol
b)
0.236 mol
c)
0.581 mol
d)
1.00 mol
45.
The molar mass of NO₂ is 46.01 g/mol. How many moles of NO₂ are present in 114.95 g?
a)
0.4003 mol
b)
1.000 mol
c)
2.498 mol
d)
114.95 mol
46.
The molar mass of CCl₄ is 153.81 g/mol. How many grams of CCl₄ are needed to have 5.000 mol?
a)
5 g
b)
30.76 g
c)
769.0 g
d)
670.05 g
47.
The molar mass of H₂O is 18.015 g/mol. How many grams of H₂O are present in 0.20 mol?
a)
0.2 g
b)
3.6 g
c)
35.9 g
d)
89.9 g
48.
Name the compound CF₄.
a)
calcium fluoride
b)
carbon fluoride
c)
carbon tetrafluoride
d)
monocarbon quadrafluoride
49.
Name the compound Fe(NO₂)₂.
a)
iron(II) nitrate
b)
iron(II) nitrite
c)
ferric nitrate
d)
ferrous nitride
50.
Name the compound KClO₃.
a)
potassium chloride
b)
potassium trioxychlorite
c)
potassium chlorate
d)
hypochlorite
51.
The type of reaction that absorbs heat from the surroundings
a)
Endothermic
b)
Exothermic
c)
Enthalpy
d)
Hess's Law
52.
The heat content of a substance
a)
Endothermic
b)
Exothermic
c)
Enthalpy
d)
Hess's Law
53.
The fact that equal masses of both water and copper, when supplied with identical energy amounts of energy heat up at different rates is due to their ___
a)
specific heat
b)
enthalpy
c)
weight
d)
atomic makeup
54.
In order to melt a substance, energy is ___
a)
absorbed
b)
released
c)
created
d)
destroyed
55.
Describes the additive nature of chemical equations and heat changes
a)
enthalpy
b)
Hess's Law
c)
Law of Conservation of Mass
d)
Law of Conservation of Energy
56.
How many kJ of energy can be released by a banana containing 150 Calories?
a)
6.3x10⁵ kJ
b)
0.028kJ
c)
36 kJ
d)
630 kJ
57.
12.09 kcal of energy is added to 45 grams of water at an initial temperature of 23.4°C. What is the final temperature of the water?
a)
290°C
b)
29°C
c)
420°C
d)
42°C
58.
Which of the following is true? Use the below equation to answer.
a)
The reaction is exothermic
b)
ΔH=+62.4kJ
c)
ΔH=-62.4kJ
d)
Not enough information to tell
59.
How much heat is involved in the production of 3.5mol I₂?
a)
110 kJ
b)
62 kJ
c)
220 kJ
d)
3.5 kJ
60.
How many moles of gallium chlorate, Ga(ClO₃)₃, must react in order to produce 674 kJ of energy according to the following reaction?
a)
10.3 mol Ga(ClO₃)₃
b)
11.4 mol Ga(ClO₃)₃
c)
6.8 mol Ga(ClO₃)₃
d)
7.60 mol Ga(ClO₃)₃
61.
Which of the following is the correct formula for magnesium chloride?
a)
Mg₂Cl₃
b)
MgCl
c)
MgCl₂
d)
Mg₂Cl
62.
What type of reaction is represented by the equation 2KClO₃(s) → 2KCl(s) + 3O₂(g)?
a)
Synthesis reaction
b)
Decomposition reaction
c)
Single-replacement reaction
d)
Double-replacement reaction
63.
How many oxygen atoms are present in one molecule of H₂SO₄?
a)
2
b)
4
c)
3
d)
6
64.
Use the balanced equation above. If 7 moles of sodium (Na) are burned, how many moles of sodium oxide (Na2O) should be formed? Round all masses to the nearest tenth including your answer. NO UNITS NEEDED ON ANSWER.
1 STEP
65.
Use the balanced equation above. If 8 moles of sodium (Na) are burned, how many grams of sodium oxide (Na2O) should be formed? The molar mass of Na2O is 62.0 g/mol.
Round your answer to the nearest whole number. NO UNITS NEEDED ON ANSWER.
2 STEP
66.
How many of each type of atom are in Ca(OH)2?
(a) Ca
(b) O
2 (c)
(d) atoms total
Choose from the below words
1
2
H
5
3
OH
Ca
67.
Label the parts of the reaction.
a)
Reactants
b)
Products
1
2
1)
2)
68.
Match the symbol to the correct word.
a)
g
1.
Gas
b)
aq
2.
Aqueous
c)
s
3.
Solid
d)
l
4.
Liquid
e)
→
5.
Yields
69.
Match the type of chemical reaction below.
a)
Synthesis reaction
1.
Na+ Cl2 → NaCl
b)
Decomposition reaction
2.
2KI −> 2K + I2
c)
Single displacement reaction
3.
Pb + FeSO4 ----> PbSO4 + Fe
d)
Double displacement reaction
4.
BaCl2+2KI −> 2KCl + BaI2
e)
Combustion reaction
5.
CH4+O2→CO2+H2O
70.
fireworks exploding (a)
Choose from the below words
chemical change
physical change
71.
What type of reaction is the bottom?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
1
2
3
4
1)
2)
3)
4)
72.
Match the following
a)
HNO3
1.
Nitric Acid
b)
NaOH
2.
Sodium Hydroxide
c)
HCl
3.
Hydrochloric Acid
d)
H2SO4
4.
Sulfuric Acid
e)
Ca(OH)2
5.
Calcium Hydroxide
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