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CHEMICAL ENERGETICS

Total questions: 95

Worksheet time: 2hrs 33mins

Name
Class
Date
1.

State whether 'melting of ice' is physical or chemical change?

a)

physical

b)

chemical

2.

State whether 'burning of magnesium' is physical or chemical change?

a)

physical

b)

chemical

3.

State whether 'evaporation of ethanol' is physical or chemical change?

a)

physical

b)

chemical

4.

State whether 'dissolving of sugar in water' is physical or chemical change?

a)

physical

b)

chemical

5.

State whether 'burning of magnesium' is exothermic or endothermic?

a)

exothermic

b)

endothermic

6.

State whether 'condensation of steam to water' is exothermic or endothermic?

a)

exothermic

b)

endothermic

7.

State whether 'addition of concentrated sulfuric acid to water' is exothermic or endothermic?

a)

exothermic

b)

endothermic

8.

State whether 'evaporation of a volatile liquid' is exothermic or endothermic?

a)

exothermic

b)

endothermic

9.

If the reaction is endothermic, _____________.

a)

the temperature decreases

b)

the temperature increases

c)

energy is taken in

d)

energy is given out

10.

If the reaction is exothermic, _____________.

a)

the temperature decreases

b)

the temperature increases

c)

energy is taken in

d)

energy is given out

11.

If ΔH < 0, __________________.

a)

the reaction is exothermic

b)

energy is given out

c)

temperature increases

d)

temperature decreases

12.

What is A?

a)

activation energy

b)

enthalpy change

c)

reactants

d)

products

13.

What is B?

a)

activation energy

b)

enthalpy change

c)

reactants

d)

products

14.

What is D?

a)

activation energy

b)

enthalpy change

c)

reactants

d)

products

15.

This reaction is __________.

a)

endothermic

b)

exothermic

16.

Which of the following is true about the formation of bonds between molecules?

a)

Energy is given off when bonds are formed between molecules.

b)

Energy is absorbed by the molecule when bonds are formed.

c)

Energy is neither given off nor absorbed when bonds are formed.

17.

Which of the following statement is true about the breaking of bonds between molecules?

a)

To break a bond between molecules, energy must be released by the molecule

b)

To break a bond between molecules, no energy is needed.

c)

To break a bond between molecules, energy must be absorbed by the molecule.

18.
Which letter corresponds to the energy of the products?
a)
A
b)
B
c)
C
d)
D
19.
If ∆H is negative, the reaction is?
a)
exothermic
b)
endothermic
20.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
21.

The energy level diagram for the reaction between magnesium and hydrochloric acid is shown.

a)

Energy is given out during the reaction

b)

The products are at a lower energy level than the reactants

c)

The reaction is endothermic.

22.

Which reaction is endothermic?

a)

acid neutralising alkali causing a temperature increase

b)

adding magnesium to hydrochloric acid

c)

calcium carbonate decomposing when heated combustion of fossil fuels

23.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
24.
Is photosynthesis an exothermic or endothermic reaction?
a)
Endothermic
b)
Exothermic
c)
Neither
25.

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

a)

exothermic

b)

endothermic

26.

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

a)

exothermic

b)

endothermic

27.
Is the combustion of gasoline endothermic or exothermic?
a)
Endothermic
b)
Exothermic
28.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Energy Producing

d)

No way to tell

29.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic reaction

30.
Melting 
a)
exothermic
b)
endothermic
31.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

32.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

33.

Complete the sentence.


During a chemical reaction, atoms ________.

a)

can appear

b)

can disappear

c)

get rearranged

d)

stop moving and vibrating

34.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

35.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
36.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
37.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
38.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
39.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
40.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
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.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
43.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

44.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

45.

Balance the following equation:

___ SeCl6+ ___ O2→___ SeO2+____Cl2

a)

1, 1, 1, 3

b)

2, 1, 2, 1

c)

1, 2, 1, 2

d)

2, 2, 2, 4

46.

What coefficient for O2 demonstrates the law of conservation of mass?


CH4(g) + __O2(g) → CO2(g) + 2H2O(g)

a)

1

b)

2

c)

3

d)

4

47.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
48.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
49.
Element or compound?
H2O
a)
Element
b)
Compound
50.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
51.

Which of the following is true about the formation of bonds between molecules?

a)

Energy is given off when bonds are formed between molecules.

b)

Energy is absorbed by the molecule when bonds are formed.

c)

Energy is neither given off nor absorbed when bonds are formed.

52.
What is the activation energy?
a)
The energy of the products
b)
The energy of the reactants
c)
The minimum energy needed by the reactants to form the products.
d)
The energy lost in the reaction
53.
If ∆H is negative, the reaction is?
a)
exothermic
b)
endothermic
54.

Which example would be considered exothermic?

a)

Melting Ice

b)

Photosynthesis

c)

Making ice cubes

d)

Cooking an egg

55.

Which reaction is endothermic?

a)

acid neutralising alkali causing a temperature increase

b)

adding magnesium to hydrochloric acid

c)

calcium carbonate decomposing when heated combustion of fossil fuels

56.

Which fuel does not produce carbon dioxide when it burns?

a)

Coal

b)

Hydrogen

c)

Methane

57.
a)

A

b)

B

c)

C

d)

D

58.

Which of the following best describes why increasing temperature increase reaction rate?

a)

Activation energy is reduced.

b)

Collisions become more frequent.

c)

Collisions become more energetic.

d)

Collisions become more frequent and more energetic.

59.

What letter represents the activation energy?

a)

A

b)

B

c)

C

d)

D

60.
Under the collision theory, the particles must collide with  ____ and ____ for a reaction to occur.
a)
sufficient rate and sufficient energy
b)
sufficient surface area and correct orientation
c)
sufficient catalyst and sufficient energy
d)
sufficent energy and correct orientation
61.
Which letter corresponds to the energy of the products?
a)
A
b)
B
c)
C
d)
D
62.
The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?
a)
Red, because the activation energy is larger
b)
Blue, because the activation energy is lower
c)
both reaction progress at the same rate
63.

Is this equation endo- or exo-thermic?

PCl3 (s) + Cl2 (g) --> PCl5 (s) + energy

a)

endothermic

b)

exothermic

64.

When new chemical bonds form, energy ____________.

a)

is taken into the system.

b)

is released from the system.

c)

stays the same in the system.

65.
a)

A

b)

B

c)

C

d)

D

66.
Which letter corresponds to the energy of the products?
a)
A
b)
B
c)
C
d)
D
67.
If ∆H is negative, the reaction is?
a)
exothermic
b)
endothermic
68.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
69.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
70.
Is photosynthesis an exothermic or endothermic reaction?
a)
Endothermic
b)
Exothermic
c)
Neither
71.

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

a)

exothermic

b)

endothermic

72.

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

a)

exothermic

b)

endothermic

73.
Is the combustion of gasoline endothermic or exothermic?
a)
Endothermic
b)
Exothermic
74.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Energy Producing

d)

No way to tell

75.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic reaction

76.
Melting 
a)
exothermic
b)
endothermic
77.
Which letter corresponds to the energy of the products?
a)
A
b)
B
c)
C
d)
D
78.

Is this equation endo- or exo-thermic?

PCl3 (s) + Cl2 (g) --> PCl5 (s) + energy

a)

endothermic

b)

exothermic

79.

What is the left part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

80.

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

81.

How many Mn atoms are found in the following compound?

2MnO4

a)

1

b)

2

c)

4

d)

8

82.

What is the little number after an element in a chemical equation called?

Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

83.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

84.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

85.

Which of the following equations are correctly balanced?

a)

12CO2 + H2O ---> C6H12O6 + O2

b)

CO2 + H2O ---> 3C6H12O6 + O2

c)

CO2 + 9H2O ---> C6H12O6 + O2

d)

6CO2 + 6H2O ---> C6H12O6 + 6O2

86.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

87.

Complete the sentence.


During a chemical reaction, atoms ________.

a)

can appear

b)

can disappear

c)

get rearranged

d)

stop moving and vibrating

88.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
89.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

90.

What are the numbers that you CANNOT change in a chemical equation? 

a)
Coefficient
b)
Products
c)
Reactants
d)

Subscripts

91.

What is the right ratio of chemicals for the balanced chemical equation?

__Ca + __H2O --> __Ca(OH)2 + __H2

a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
92.

What is the right ratio of chemicals for the 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
93.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CH4 + __O2 --> __CO2+ __H2O
a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
94.

What is the right ratio of chemicals for the balanced chemical equation?

__H2 + __S --> __H2S

a)
1,1 --> 1
b)
2,2 --> 2
c)
1,2 --> 1
d)
1,2 --> 2
95.

What is the right ratio of chemicals for the balanced chemical equation?

__H2SO3 + __KOH--> __H2O+ __K2SO3

a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1

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