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WorksheetsStates of Matter and Heating Curves
Total questions: 15
Worksheet time: 15mins
The following image shows the temperature change of a substance as thermal energy is released over time. Select all regions where the phase is changing
AB
BC
CD
DE
E to the end
Region QR represents a substance in the liquid phase. What does region RS represent?
melting
boiling
solid
gas
Region QR represents a substance in the liquid phase. Is this substance possibly water? How do you know?
(a) (b)
yes
no
This substance boils at 100 degrees C
This substance freezes at 40 degrees C
This substance boils at 110 degrees C
This cooling curve shows the freezing of a substance. The starting phase at AB is (a) . Region BC shows (b) . From C to the end, the substance is (c) . The melting point of this substance is (d) °C
a liquid
freezing
a solid
a gas
condensing
melting
150
200
110
Select 2 terms that represent PHASE CHANGES that can happen if a sample of matter absorbs thermal energy
melting
gas
freezing
liquid
boiling
Select 3 terms that represent PHASE CHANGES that can happen if a sample of matter releases thermal energy
condensing
sublimation
evaporation
deposition
freezing
On a heating or cooling curve, the substance is a single state of matter (solid, liquid, or gas) when the line is
sloped (going up or down at an angle)
horizontal (flat)
The following image shows the temperature change of a substance as thermal energy is released over time.
At BC, the temperature is ________ °C and the phase change is called ___________
(a) (b)
150
100
freezing
condensation
boiling
This curve represents a _____ curve because the temperature is ______ (a) (b)
heating
increasing
cooling
decreasing
Region QR represents a substance in the liquid phase. What does region ST represent?
melting
boiling
solid
gas
If Region AB is a gas, identify BC and C to the end.
condensation
liquid
boiling
freezing
solid
If Region AB is a liquid, identify BC and C to the end.
freezing
solid
condensing
gas
melting
Which phase change occurs when a solid turns directly into a gas without passing through the liquid state?
Melting
Sublimation
Condensation
Freezing
On a heating curve, what does a horizontal line typically represent?
A phase change
An increase in temperature
A decrease in temperature
A chemical reaction
Which of the following best describes the process of boiling?
A liquid turning into a solid
A gas turning into a liquid
A liquid turning into a gas
A solid turning into a liquid
