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1.2 Heating & Cooling Curves

Total questions: 36

Worksheet time: 2hrs 24mins

Name
Class
Date
1.

Between which points is the temperature of the substance remaining constant?

a)

A-B only

b)

A-B, C-D, and E-F

c)

B-C only

d)

B-C and D-E

2.

The melting point of the sample is

a)

-60 ºC

b)

20 ºC

c)

60 ºC

d)

100 ºC

3.

Which letter indicates where water is in both the solid and liquid phase at the same time?

a)

A

b)

B

c)

C

d)

D

e)

E

4.

In which region(s) does temperature increase?

a)

Region C only

b)

Regions B and D

c)

Regions A, C, and E

d)

Regions A and B

5.

In which region(s) of the heating curve would water be a liquid and a gas at the same time?

a)

A

b)

B

c)

C

d)

D

e)

E

6.

Describe the substance at letter A.

a)

Solid

b)

Liquid

c)

Melting

d)

Evaporating

7.

How many states of matter are present during line segment BC?

a)

One

b)

Two

c)

Three

d)

Depends on the temperature

8.

At which letter is the substance changing its state of matter?

a)

A only

b)

A, C, and E

c)

D and E

d)

B and D

9.

NaCl was heated starting at an initial temperature of 0°C. The heating curve is shown in the picture. What is the melting point of this substance?

a)

0°C

b)

801°C

c)

1000°C

d)

1465°C

10.

Describe the substance at letters D.

a)

Gas

b)

Liquid

c)

Melting

d)

Evaporating

11.

At higher temperatures

a)

Particles in an object move slower

b)

Particles in an object move faster

c)

Particles move at the same speed as lower temperature

12.
In which region(s) does temperature remain constant?
a)
Region 1, 3, & 5
b)
Region 2 & 4
c)
Region 1 only
d)
Region 1 & 2
13.
In which region(s) does temperature increase?
a)
Region 1, 3, & 5
b)
Region 2 & 4
c)
Region 1 only
d)
Region 1 & 2
14.
In which region(s) of the graph would the substance only be in one phase?
a)
Region 1, 3, & 5
b)
Region 2 & 4
c)
Region 1 only
d)
Region 1 & 2
15.
Describe the substance between letters C and D. 
a)
Gas
b)
Liquid
c)
Melting
d)
Evaporating
16.

Thermal energy always moves:

a)

From a high temperature object to a lower temperature object.

b)

From a lower temperature object to a higher temperature object.

c)

From an object with lower kinetic energy to an object with higher kinetic energy.

d)

From an object of higher mass to an object of lower mass.

17.

What does heat do to intermolecular forces?

a)

strengthens them

b)

Weakens them

c)

reverses them

18.

As matter cools what happens to the intermolecular forces?

a)

they strengthen

b)

they weaken

c)

they reverse

19.

This curve indicates what about the heat energy?

a)

Heat energy is being added or absorbed

b)

Heat energy is being released

20.

In which region(s) of the graph would the substance be a liquid and a gas at the same time?

a)

Region 1

b)

Region 2

c)

Region 3

d)

Region 4

e)

Region 5

21.

What is the freezing point of the substance?

a)

0oC

b)

60oC

c)

120oC

d)

180oC

22.
What line segment represents only the solid state?
a)
A-B
b)
B-C
c)
C-D
d)
D-E
23.
Which process takes the longest to occur?
a)
melting
b)
boiling
c)
freezing
d)
heating the solid
24.
What state(s) of matter are present at D-E?
a)
Solid-liquid
b)
Liquid
c)
Liquid-gas
d)
Gas-Solid
25.

Describe the substance at letter E

a)
b)
c)
26.

Describe the substance at letter C

a)
b)
c)
27.

Describe the substance at letter A.

a)
b)
c)
28.
In which region(s) does temperature increase?
a)
Region 1, 3, & 5
b)
Region 2 & 4
c)
Region 1 only
d)
Region 1 & 2
29.
In which region(s) does temperature remain constant?
a)
Region 1, 3, & 5
b)
Region 2 & 4
c)
Region 1 only
d)
Region 1 & 2
30.
In which region of the graph would be used to find the melting of the substance?
a)
Region 2
b)
Region 3
c)
Region 4
d)
Region 5
31.

The heating curve for a sample of pure ethanol is provided

above. The temperature was recorded as a 50.0 g sample of

solid ethanol was heated at a constant rate. What is the boiling point of ethanol?

a)

50K

b)

150K

c)

350K

d)

550K

32.
What is the boiling point for this substance?
a)
60 °C
b)
40 °C
c)
120 °C
d)
100 °C
33.
What is the freezing point for this substance?
a)
60 °C
b)
40 °C
c)
80 °C
d)
100 °C
34.
What is the melting point for this substance?
a)
60 °C
b)
40 °C
c)
80 °C
d)
100 °C
35.

In which region(s) of the graph would the substance be a solid only?

a)

Region A-C

b)

Region C-E

c)

Region E-G

d)

Region G-I

e)

Region I-K

36.

In which region(s) of the graph would the substance be freezing?

a)

Region A-C

b)

Region C-E

c)

Region E-G

d)

Region G-I

e)

Region I-K

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