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Unit 8 test review

Total questions: 122

Worksheet time: 2hrs 28mins

Name
Class
Date
1.

What is a chemical reaction?

a)

A process that leads to the transformation of weather patterns

b)

A process that leads to the transformation of one set of chemical substances to another

c)

A process that leads to the transformation of physical properties

d)

A process that leads to the transformation of energy

2.

Give an example of a physical change.

a)

Melting of ice

b)

Burning of wood

c)

Boiling of water

d)

Rusting of iron

3.

What are some signs of a chemical change?

a)

Change in temperature

b)

Color change, production of gas, formation of a precipitate, and release of heat or light

c)

Change in state of matter

d)

Change in shape or size

4.

Is burning wood a chemical or physical change? Why?

a)

Spiritual change

b)

Emotional change

c)

Physical change

d)

Chemical change

5.

What happens to the composition of a substance during a physical change?

a)

It disappears completely

b)

It becomes radioactive

c)

It turns into a different element

d)

It remains the same

6.

Explain the difference between a chemical change and a physical change.

a)

A chemical change involves the change in color of a substance, while a physical change only alters the form or appearance of a substance without changing its chemical composition

b)

A chemical change only alters the form or appearance of a substance without changing its chemical composition, while a physical change involves the formation of new substances with different properties

c)

A chemical change involves the change in state of a substance, while a physical change only alters the form or appearance of a substance without changing its chemical composition

d)

A chemical change involves the formation of new substances with different properties, while a physical change only alters the form or appearance of a substance without changing its chemical composition.

7.

What are some examples of evidence of a chemical change?

a)

Change in texture

b)

Change in state of matter

c)

Formation of a precipitate, color change, gas production, and temperature change

d)

Change in shape

8.

How can you tell if a chemical change has occurred?

a)

By tasting the substance

b)

By smelling the substance

c)

By observing the change in temperature

d)

By observing the formation of a new substance, change in color, production of gas, or release of energy.

9.

What are some examples of physical changes?

a)

Baking a cake, mixing salt and water, burning wood

b)

Melting ice, boiling water, cutting paper

c)

Freezing water, dissolving sugar, fermenting grapes

d)

Digesting food, photosynthesis, rusting of iron

10.

Why is it important to distinguish between chemical and physical changes?

a)

To understand the nature of the changes and their impact on the substances.

b)

Because it doesn't really matter, they are basically the same

c)

To confuse students and make the topic more difficult

d)

To waste time and make the learning process more tedious

11.

First lets review!!

What are some signes that a chemical reaction has taken place?

a)

change in shape

b)

bubbles of gas appear

c)

melting

d)

dissolving

12.

After you combine two substance together, a news substance forms. This is an example of :

a)

physical change

b)

chemical change

13.

In an endothermic reaction, energy is

a)

absorbed

b)

released

14.

If a chemical reaction is ENDOTHERMIC, the temperature would...

a)

stay the same

b)

increase

c)

decrease

15.

In an exothermic reaction, energy is

a)

absorbed

b)

released

16.

If a chemical reaction is EXOTHERMIC, the temperature would...

a)

stay the same

b)

increase

c)

decrease

17.

What instrument would you use to detect an endothermic or exothermic reaction?

a)

triple beam balance

b)

ruler

c)

thermometer

d)

barometer

18.

_____ reactions usually feel cool

a)

endothermic reaction

b)

exothermic reaction

19.

Surrounding temperature gets warmer

a)

endothermic

b)

exothermic

20.

Photosynthesis

a)

endothermic

b)

exothermic

21.

The initial temperature was measured to be 20oC and the final temperature was 45oC. The reaction was

a)

endothermic

b)

exothermic

22.

Rocket launch

a)

endothermic

b)

exothermic

23.

The initial temperature was measured to be 20oC and the final temperature was 10oC. The reaction was

a)

endothermic

b)

exothermic

24.

Which of the following are examples of an Endothermic Reaction?

a)

Baking a cake

b)

Candles burning

c)

water evaporting

d)

water freezing

25.

Which of the following are examples of an Exothermic Reaction?

a)

Baking a cake

b)

Candles burning

c)

water evaporating

d)

water freezing

26.

What type of reaction is this and how do you know?

4 lines
27.

What is this graph showing? How do you know?

4 lines
28.

How would you measure the rate of a reaction?

4 lines
29.

In order to determine the rate of a reaction would you measure the reactions

a)

temperature

b)

mass of the product over time

30.

Catalyst is the opposite of an inhibitor... a catalyst will

a)

speed up a reaction

b)

slow down a reaction

31.

We want to make elephant toothpaste, which is an exothermic reaction because heat is released... How can we create the biggest reaction?

4 lines
32.

How do you feel about endothermic and exothermic reaction and the rates of reactions?

a)

5

b)

4

c)

3

d)

2

e)

1

33.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

34.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

35.
 Mg  +  ___ HCl  →   MgCl2  +   H2
a)
1
b)
2
c)
3
d)
4
36.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
37.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
38.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
39.
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
40.
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
41.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
42.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
43.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
44.
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
45.
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
46.
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
47.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
48.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
49.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
50.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
51.

The two sides of a chemical equation are called?

a)

Reactants (left) and Products (right)

b)

Ingredients (left) and Product (right)

c)

Cations and Anions

d)

Reactants (left) and Results (right)

52.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
53.

chemical equation that uses coefficients to show that the number of atoms of each element that enters into a reaction is equal to the number of atoms of that same element produced during the reaction 

a)

balanced chemical equations

b)

chemical equation

c)

chemical reaction

d)

neutralization reaction

54.

a condensed statement that used chemical formulas and identifies the reactants and products of a chemical reaction

a)

chemical equation

b)

balanced chemical equation

c)

chemical reaction

d)

single displacement reaction

55.

process in which one or more substances are converted into new substances with different chemical and physical properties

a)

chemical reaction

b)

chemical equation

c)

single displacement reaction

d)

synthesis reaction

56.

a whole number that precedes a reactant or product symbol or formula in a chemical equation and indicates the relative number or representative particles involved in the reaction

a)

coefficent

b)

chemical reaction

c)

chemical equation

d)

double displacement reaction

57.

a chemical reaction in which a hydrocarbon reacts with oxygen to produce carbon dioxide, water, and energy in the form of heat and/or light

a)

combustion reaction

b)

decomposition reaction

c)

double displacement reaction

d)

single displacement reaction

58.

matter is neither created nor destroyed

a)

conservation of matter

b)

decompostion reaction

c)

single displacement reaction

d)

chemical reaction

59.

a chemical reaction in which a single complex compound is broken down into two or more products; general form is 

AB   yields   A  +  B

a)

decomposition reaction

b)

combustion reaction

c)

single displacement reaction

d)

neutralization reaction

60.

a chemical reaction in which the cations from two ionic compound replace each other forming two new ionic compounds; the general form is    AB  +  CD   yields   AD + CB

a)

double displacement reaction

b)

single displacement reaction

c)

combustion reaction

d)

synthesis reaction

61.

a chemical reaction between an acid and a base that destroys the chemical and physical properties of both; the products are water and a salt formed from the cation of a base and the anion of an acid

a)

neutralization reaction

b)

decomposition reaction

c)

combustion reaction

d)

double displacement reaction

62.

a chemical reaction in which a single element displaces another element that is part of a compound; general form is

A  +  BC    yields    B  +  AC

a)

single displacement reaction

b)

double displacement reaction

c)

synthesis reaction

d)

neutralization reaction

63.

a chemical reaction in which two or more elements or compound combine to form a single product; general form is

A  +  B    yields    AB

a)

synthesis reaction

b)

double displacement reaction

c)

single displacement reaction

d)

decomposition

64.

How many atoms in all are in a molecule of serotonin?

C10H12N2O

a)
22
b)
24
c)
25
d)
4
65.

What is a substance that speeds up the rate of a chemical reaction?

a)

Rate

b)

Catalyst

c)

Calorimeter

d)

Hydrocarbon

66.
If you start a chemical reaction with 5 atoms of helium, how many atoms will you have after?
a)
4 atoms
b)
10 atoms
c)
1 atom
d)
5 atoms
67.

radioactive decay in which an atomic radius emits an alpha particle (helium nuclei) and a stable isotope; the stable isotope can be identified by subtracting 4 from the mass number of the radioactive isotope and subtracting 2 from its mass number

a)

alpha radioactive decay

b)

gamma radioactive decay

c)

nuclear reaction

d)

combustion reaction

68.

A french nobleman and chemist who had a big affection for the histories of chemistry and biology; developed the law of conservation of mass/matter

a)

Antoine Lavoisier

b)

coefficient

c)

President Obama

d)

Martin Luther King Jr.

69.

a type of radioactive decay that does not emit charged particles; it emits a high energy form of electromagnetic called a gamma ray photon

a)

gamma radioactive decay

b)

beta radioactive decay

c)

neutralization reaction

d)

synthesis reaction

70.

a reaction where the identity or characteristics of an atomic nucleus changes when it is bombarded with an energetic particle, such as in fission of radioactive decay

a)

nuclear reaction

b)

neutralization reaction

c)

combustion reaction

d)

decomposition reaction

71.

Which of the following are examples of an Exothermic Reaction?

a)

Cooking an egg

b)

Plants making sugar through photosynthesis

c)

Dynamite exploding

72.

4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

73.

What type of reaction involves the breaking down of a substance into simpler substances?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

74.

What type of reaction involves 2 substances combining to form 1 new compound?

a)

Decomposition Reaction

b)

Single Displacement Reaction

c)

Double Displacement Reaction

d)

Synthesis Reaction

75.

What are the reactants in the chemical equation pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and H2O

d)

O2 and H2O

76.

What are the products of the chemical reaction pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and H2O

d)

O2 and H2O

77.

What type of chemical reaction is this one?

CUO + CO2 --> CuCO3

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

78.

The right side of the equation below is called the

a)

products

b)

reactants

79.

What type of reaction is illustrated below?

2HI --> H2 + I2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

80.

What type of chemical reaction is this one?

C2H2 + O2 --> CO2 + H2O

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

81.

HNO₃ + NaOH → NaNO₃ + H₂O

a)

Neutralization/acid base

b)

Single Replacement

c)

Combustion

d)

Double Replacement

82.
Cu + 2Ag(NO3) → 2Ag + Cu(NO3)
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
83.

Which type of chemical reaction has two or more reactants to make one product?

a)

combustion

b)

single displacement

c)

double displacement

d)

synthesis

e)

decomposition

84.

What reaction has the following general formula:

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

85.

What reaction has the following general formula:

A + CD --> C + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

86.

What reaction has the following general formula:

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

87.

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

88.
Provides evidence that a chemical reaction has occurred. 
a)
dissolving 
b)
melting
c)
formation of a gas
d)
bending
89.
What type of chemical reaction takes place when fluorine reacts with sodium bromide?
a)
single replacement 
b)
double replacement 
c)
combustion
d)
synthesis 
90.

What is the general reaction scheme for a double replacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

91.

What type of reaction is the following:
C11H24+17O2−> 11CO2 + 12H2OC_{11}H_{24}+17O_2->\ 11CO_2\ +\ 12H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

92.

What type of reaction is the following:
Na2S +2HCl −> H2S+2NaClNa_2S\ +2HCl\ ->\ H_2S+2NaCl

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

93.
The SI unit of heat and energy is the __________.
a)
calorie
b)
heat
c)
joule
d)
watt
94.
Entropy is a measure of the number of possible ways that the energy of a system can be distributed. 
a)
true
b)
false
95.
The amount of energy required to raise the temperature of one gram of pure water by one degree Celsius is defined as: 
a)
a joule
b)
a watt
c)
a calorie
d)
heat
96.
The __________ law of thermodynamics states that entropy is always increasing. 
a)
first
b)
second
c)
third
d)
zeroth
97.
Heat transfer [blank] occurs from hot to cold. 
a)
always
b)
never
c)
sometimes
d)
rarely
98.
Temperature is a measure of average [blank] energy of individual atoms.
a)
heat
b)
potential
c)
mechanical
d)
kinetic
99.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
100.
Which phase of matter has the greatest motion and least orderly arrangement?
a)
solid
b)
liquid
c)
gas
101.
True/False: The rate of a chemical reaction is unrelated to the spontaneity of the reaction.
a)
True
b)
False
102.
A catalyst works by
a)
changing the order of the reaction
b)
increasing the temperature
c)
lowering the activation energy
d)
making the activated complex
103.

It is the amount of disorder in a system.

a)

Enthalpy

b)

Entropy

c)

Entrolpy

d)

Enthralpy

e)

Maybe Entropy or Enthalpy, they are the same ya know.

104.

If Ice melts, its entropy increases.

a)

Trulala

b)

Falsemama

c)

It will not change. So... none of the above.

105.
Entropy increases from solid, liquid to gas. Why?
a)
Molecular disorder increases
b)
Molecular randomness decreases
c)
Molecules are more energetic
d)
Molecules are more reactive
106.

Which represents a decrease in entropy?

a)

sublimation of CO2

b)

boiling water

c)

condensation of steam on cold glass

d)

NaCl dissolving in water

107.

The entropy will usually increase when

a)

a molecule is broken into two or more smaller molecules

b)

a reaction occurs that results in an increase in the number of moles of gas

c)

a solid changes to a liquid

d)

all of these

108.

How many elements are in this chemical formula? NaHCO3NaHCO_3  

a)

1

b)

2

c)

3

d)

4

109.

Which of the following is a neutralization reaction?

a)

2Na + Cl2 → 2NaCl

b)

CH4 + 2O2 → CO2 + 2H2O

c)

HCl + KOH → KCl + H2O

d)

CaCO3 → CO2 + CaO

110.

HNO3 + H2O → H3O+ + NO31-

NO31- is the conjugate base of

a)

H2O

b)

HNO3

c)

H3O+

d)

none of the above

111.

HCO3- + H2O → H3O+ + CO32-

Water is acting as

a)

a Bronsted Lowry base

b)

a Bronsted Lowry acid

c)

a strong acid

d)

a weak acid

112.

HC2H3O2 + H2O → H3O+ + C2H3O21-

HC2H3O2 is acting as

a)

a conjugate base

b)

a Bronsted Lowry base

c)

a Bronsted Lowry acid

d)

none of the above

113.

What is the conjugate base of H2SO4?

a)

SO42-

b)

H2SO3

c)

HSO31-

d)

HSO41-

114.

HBr is the conjugate acid of

a)

Br1-

b)

Br2

c)

H2Br

d)

none of the above

115.

Which of the following is a strong base?

a)

NH3

b)

Zn(OH)2

c)

HCl

d)

CsOH

116.

Which of the following is a strong acid?

a)

NaOH

b)

HCl

c)

HF

d)

H2O

117.
What is essential for a combustion reaction to begin?
a)
Carbon dioxide
b)
Fuel 
c)
Fuel, oxygen and heat
d)
Water and oxygen
118.
The word equation for combustion is:
fuel + oxygen -->
 water + ________ __________
a)
Carbon dioxide
b)
Limewater
119.
The enthalpy for a combustion reaction is always 
a)
positive
b)
negative
c)
zero
d)
changeable
120.
All combustion reactions are 
a)
endothermic
b)
exothermic
c)
neutral
d)
fast
121.
A compound that contains only carbon and hydrogen and that produces carbon dioxide and water when burned is called a(n)
a)
binary compound
b)
carbonate
c)
ionic compound
d)
hydrocarbon
122.

What are the products of combustion?

a)

Hydrogen + oxygen

b)

Carbon dioxide + water

c)

Carbon dioxide + hydrogen

d)

Carbon + water

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