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Phase Change, Exothermic & Endothermic Reactions

Total questions: 100

Worksheet time: 1hrs 18mins

Name
Class
Date
1.

Phase change going from Liquid to Solid...

a)

Melting

b)

Freezing

c)

Condensation

d)

Sublimation

2.

Phase change going from a Gas to a Liquid...

a)

Sublimation

b)

Deposition

c)

Ionization

d)

Condensation

3.

Phase change going from a Liquid to a Gas...

a)

Vaporization

b)

Deposition

c)

Condensation

d)

Melting

4.

Phase change going from a Gas to a Plasma...

a)

Melting

b)

Vaporization

c)

Ionization

d)

Freezing

5.

Phase change going from a Solid to a Gas...

a)

Deposition

b)

Sublimation

c)

Condensation

d)

Recombination

6.

Phase change going from a Solid to a Liquid...

a)

Freezing

b)

Condensation

c)

Melting

d)

Sublimation

7.

Phase change going from a Plasma to a Gas...

a)

Ionization

b)

Recombination

c)

Condensation

d)

Sublimation

8.

Phase change going from a Gas to a Solid...

a)

Deposition

b)

Sublimation

c)

Condensation

d)

Vaporization

9.

Is the substance gaining or losing energy?

a)

Gaining

b)

Losing

10.

Are the particles moving faster or slower as time goes on?

a)

Faster

b)

Slower

11.

What state/phase is the object likely from points A to B?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

12.

What is happening to the particles in the substance between points A and B?

a)

Melting

b)

Freezing

c)

Speeding Up

d)

Slowing Down

13.

What is happening to the particles in the substance between points D and E?

a)

Melting

b)

Freezing

c)

Vaporizing

d)

Sublimating

14.

Is the substance gaining or losing energy?

a)

Gaining

b)

Losing

15.

Where on the graph are phase changes taking place?

a)

1

b)

2

c)

3

d)

4

e)

5

16.

If this is a boiling point graph of a mixture of two liquids, what is the boiling point of the first liquid?

a)

30ºC

b)

70ºC

c)

140ºC

d)

185ºC

17.

If this is a boiling point graph of a mixture of two liquids, what is the boiling point of the second liquid?

a)

30ºC

b)

70ºC

c)

140ºC

d)

185ºC

18.

If this is a boiling point graph of a mixture of two liquids, at what point is both liquids completely liquid?

a)

A

b)

B

c)

C

d)

D

e)

E

19.

If this is a boiling point graph of a mixture of two liquids, between which two points is liquid 1 part liquid and part gas?

a)

A & B

b)

B & C

c)

C & D

d)

D & E

20.

If this is a boiling point graph of a mixture of two liquids, between which two points is liquid 1 all gas and liquid 2 is all liquid?

a)

A & B

b)

B & C

c)

C & D

d)

D & E

21.

If this is a boiling point graph of a mixture of two liquids, between which two points is liquid 1 all gas and liquid 2 is part liquid and part gas?

a)

A & B

b)

B & C

c)

C & D

d)

D & E

22.

If this is a boiling point graph of a mixture of two liquids, at what point is liquid 1 starting to boil?

a)

A

b)

B

c)

C

d)

D

e)

E

23.

If this is a boiling point graph of a mixture of two liquids, at what point is liquid 2 finished boiling?

a)

A

b)

B

c)

C

d)

D

e)

E

24.

If this is a boiling point graph of a mixture of two liquids, between which two points would you stop heating and/or change the collection flask in order to separate these liquids?

a)

A & B

b)

B & C

c)

C & D

d)

D & E

25.

What would you need to do to a mixture of two liquids in order to create this boiling point graph?

a)

heat it up

b)

cool it down

c)

place it on a balance

d)

pour it into a graduated cylinder

26.

If this is a phase change graph of a pure substance, what is the melting point of this substance?

a)

30ºC

b)

70ºC

c)

140ºC

d)

185ºC

27.

If this is a phase change graph of a pure substance, what is the freezing point of this substance?

a)

30ºC

b)

70ºC

c)

140ºC

d)

185ºC

28.

If this is a phase change graph of a pure substance, what is the boiling point of this substance?

a)

30ºC

b)

70ºC

c)

140ºC

d)

185ºC

29.

If this is a phase change graph of a pure substance, what is the phase of the substance at point A?

a)

B.E.C.

b)

solid

c)

liquid

d)

gas

e)

plasma

30.

If this is a phase change graph of a pure substance, between which two points is it both a solid and a liquid?

a)

A & B

b)

B & C

c)

C & D

d)

D & E

31.

If this is a phase change graph of a pure substance, between which two points is it both a liquid and a gas?

a)

A & B

b)

B & C

c)

C & D

d)

D & E

32.

If this is a phase change graph of a pure substance, between which two points is it just a liquid?

a)

A & B

b)

B & C

c)

C & D

d)

D & E

33.

If this is a phase change graph of a pure substance, at which point is all the liquid turned into gas?

a)

A

b)

B

c)

C

d)

D

e)

E

34.

If this is a phase change graph of a pure substance, at which point is it finished melting?

a)

A

b)

B

c)

C

d)

D

e)

E

35.

If this is a phase change graph of a pure substance, at which point does it start to melt?

a)

A

b)

B

c)

C

d)

D

e)

E

36.

If you want to heat 50 ml of a liquid to determine its boiling point, what tool would you use to measure its volume?

a)

graduated cylinder

b)

balance

c)

metric ruler

d)

beaker

e)

flask

37.

If you want to heat 50 ml of a liquid to determine its boiling point, what tool would be best to heat it in?

a)

graduated cylinder

b)

balance

c)

metric ruler

d)

flask

38.

If you want to heat 50 ml of a liquid to determine its boiling point, what would you add to the flask with the liquid?

a)

a magnet

b)

some hydrochloric acid

c)

some boiling chips

d)

some additional water

39.

If you want to heat 50 ml of a liquid to determine its boiling point, what tool would you use to measure the temperature?

a)

balance

b)

thermometer

c)

graduated cylinder

d)

beaker

40.

If you want to heat 50 ml of a liquid to determine its boiling point, what metric units would you use to measure the temperature?

a)

Celsius

b)

Fahrenheit

c)

grams

d)

meters

41.
The phase change from water vapor to liquid water is known as...
a)
evaporation
b)
precipitation
c)
condensation
d)
sublimation
42.
2. A change of state from a liquid to a solid is called....
a)
Melting
b)
Freezing
c)
Evaporation
43.

Phase change going from a Gas to a Liquid...

a)

Sublimation

b)

Deposition

c)

Ionization

d)

Condensation

44.

Phase change going from a Liquid to a Gas...

a)

Vaporization

b)

Deposition

c)

Condensation

d)

Melting

45.

Phase change going from a Solid to a Gas...

a)

Deposition

b)

Sublimation

c)

Condensation

d)

Recombination

46.

Phase change going from a Solid to a Liquid...

a)

Freezing

b)

Condensation

c)

Melting

d)

Sublimation

47.

Phase change going from a Gas to a Solid...

a)

Deposition

b)

Sublimation

c)

Condensation

d)

Vaporization

48.

What state/phase is the object likely from points A to B?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

49.

What is happening to the particles in the substance between points D and E?

a)

Melting

b)

Freezing

c)

Vaporizing

d)

Sublimating

50.

Where on the graph are phase changes taking place?

a)

1

b)

2

c)

3

d)

4

e)

5

51.
When the temperature of matter increases the particles...
a)
speed up and move closer
b)
speed up and move farther apart
c)
slow down and move closer together
d)
slow down and move farther apart
52.
No Definite Shape and No Definite Volume
a)
Gas
b)
Liquid
c)
Solid
53.
Definite shape and a definite volume.
a)
Gas
b)
Liquid
c)
Solid
54.
No definite shape, but has a definite volume
a)
Gas
b)
Liquid
c)
Solid
55.

Between which two points is the gas heating up?

a)

A ----> B

b)

B <---- C

c)

C ----> D

d)

D ----> E

e)

E ----> F

56.
Between which points is the temperature of the substance remaining constant?
a)
A-B only. 
b)
A-B, C-D, E-F
c)
B-C only. 
d)
B-C, D-E
57.
A substance's heating curve is shown in the graph.  What is its boiling point?
a)
100 C
b)
60 C
c)
80 C
d)
20 C
58.
The graph shows a cooling curve for an unknown substance.  What is happening during segment DE?
a)
boiling
b)
condensation
c)
freezing
d)
melting
59.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
60.
When iron nails get rusty, heat is released.  What process is this?
a)
Exothermic
b)
Endothermic
61.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
62.

What energy is stored and waiting to be used?

a)

Kinetic Energy

b)

Potential Energy

63.
Heat transfers from an area of ____temperature to an area of ___ temperature.
a)
high to low
b)
low to high
c)
high to high
d)
It can travel high to low and low to high. 
64.

The law of conservation of energy states that

a)

energy can be created or destroyed

b)

energy cannot be created or destroyed

c)

energy can be potential or kinetic only

d)

heat energy is kinetic energy

65.

What would likely happen if you were to touch the flask in which an exothermic reaction was occurring?

a)

The flask would feel cooler

b)

The flask would feel warmer

c)

The flask would feel the same before and after a reaction

d)

None of the above

66.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
67.
In an exothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released
68.

During an exothermic reaction, heat is _________ and chemical bonds __________.

a)

released, formed

b)

absorbed, broken

c)

released, broken

d)

absorbed, formed

69.

During an endothermic reaction, heat is ________ and chemical bonds _______.

a)

released, formed

b)

absorbed, broken

c)

released, broken

d)

absorbed, formed

70.

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

a)

triple beam balance

b)

ruler

c)

thermometer

71.
Do the reactants in an exothermic reaction have a higher or lower energy than the products?
a)
Higher
b)
Lower
72.
Do reactants in an endothermic reaction have a higher or lower energy than the products? 
a)
Higher
b)
Lower
73.
What is true of this reaction?
a)
Equal amounts of energy were released and absorbed
b)
The reaction released more energy than it absorbed
c)
The reaction absorbed more energy than it released
74.

How many Joules of energy are required to make 50.0 grams of ice at 0 οC completely melt?

a)

334 J

b)

0 J

c)

33,400 J

d)

16,700 J

75.
Specific heat of water is  4.18 J/g°C. Specific heat of wood is 1.760 J/g°C What material needs more heat energy to raise the temperature?
a)
Water
b)
Wood
c)
Both are same
76.

What is the formula to calculate heat energy required to raise the temperature of any substance?

a)

Q=mc∆t

b)

Q=mH

c)

Q= ½mv

d)

m=QC

77.

The heat absorbed while a solid is melting is known as....

a)

heat of fusion

b)

heat of solid

c)

heat of liquid

d)

heat of vaporization

78.

Calculate the energy needed to completely boil away 30 g of water at 100 ⁰C .

a)

67,800 J

b)

2260 J

c)

226,000 J

d)

100 J

79.

Heat always flows from a __________________ to a cooler object.

a)

warmer

b)

cooler

c)

liquid

d)

gas

80.

Higher temperatures indicate

a)

slower motion of molecules

b)

molecules at rest

c)

faster motion of molecules

81.

Temperature when a substance changes from a solid to a liquid

a)

freezing point

b)

heat of fusion

c)

thermal expansion

d)

melting point

82.

The Temperature when a liquid turns to a solid

a)

freezing point

b)

heat of fusion

c)

thermal expansion

d)

melting point

83.

The amount of heat needed to change 1 gram of a substance from the liquid phase to the gas phase is ___

a)

Heat of Vaporization

b)

Boiling point

c)

Heat Energy

d)

Phase change

84.

Temperature when a substance changes from a liquid to a gas

a)

Heat of Vaporization

b)

Boiling point

c)

Heat Energy

d)

Phase change

85.

How many Joules of energy are required to make 100 grams of ice at 0 οC completely melt?

a)

200 J

b)

400 J

c)

33,400 J

d)

2,000,000 J

86.
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
87.
According to collision theory, what must the reactants have in order to form products?
a)
The right size
b)
The right shape
c)
Enough energy
d)
Nothing
88.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
89.
What kind of reaction is this?
a)
Endothermic
b)
Exothermic
c)
Cannot be determined
90.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy or reaction

b)

by giving them more energy

c)

by making them more available

91.

What term is given to a reaction which transfers heat energy to the surroundings?

a)

Endothermic

b)

Reversible

c)

Exothermic

d)

Exotermic

92.

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

a)

Endothermic

b)

Decomposition

c)

Exothermic

d)

Indothermic

93.

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

a)

The solution at the end is acidic

b)

The reaction is reversible

c)

The reaction is exothermic

d)

The reaction is endothermic

94.
What letter represents the energy of the products?
a)
A
b)
B
c)
C
d)
D
95.
What type of reaction is this?
a)
Endothermic
b)
Exothermic
96.

Rank the state os matter from FASTEST to SLOWEST particle speed.

a)

solid, liquid, gas

b)

liquid, solid, gas

c)

gas, liquid, solid

d)

gas, solid, liquid

97.

The higher the temperature a substance has the

a)

more energy it has

b)

less energy it has

98.

What is necessary for a chemical reaction to occur?

a)

Correct orientation of particles when they collide

b)

particle collisions

c)

an increase or decrease in temperature

d)

particle collisions with sufficient energy

e)

a catalyst

99.

What happens to reaction rate if surface area is decreased?

a)

it increases

b)

it decreases

c)

it stays the same

100.

What happens to reaction rate when temperature is decreased?

a)

it increases

b)

it decreases

c)

it stays the same.

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