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WorksheetsPhase change
Total questions: 20
Worksheet time: 13mins
The boiling point of water on Celsius and Kelvin scale respectively is:
373, 273
0, 273
273,373
100, 373
The change of a liquid into vapor is called
solidification
vaporization
liquifaction
sublimation
In a cup of liquid water, when would the water molecules stop moving?
The molecules would stop moving if the liquid water in the cup became a solid.
The molecules would stop moving if the liquid water in the cup became a gas.
The molecules would stop moving if the liquid water in the cup became still.
The molecules would not stop moving in the cup of liquid water.
A candle drips wax on a table. This is an example of what phase change?
freezing
melting
sublimation
condensation
Which phase changes require anincrease in energy?
melting and freezing
freezing and vaporization
melting and vaporization
Which phase change require an overall energy loss?
melting
boiling
evaporation
freezing
Adding energy to a substance makes its particles move _______________.
faster
slower
the same
Which phase change occurs during drying of clothes hang on a clothesline?
melting
boiling
freezing
evaporization
Which of the following sentences about evaporation is incorrect?
Evaporation occurs at any temperature.
No bubbles are formed in the liquid during evaporation.
Evaporation takes place within the liquid.
Evaporation takes place on the surface of the liquid.
Melting is a change of state
from solid to liquid with change of temperature of 25 degrees Celsius.
from solid to liquid without change in temperature
from liquid to gas without change in temperature
from liquid to gas with change in temperature of 75 degrees Celsius
Boiling is the change of state
from solid to liquid with change in temperature of 25 degrees Celsius
from liquid to gas with change in temperature of 25 degrees Celsius
from solid to liquid without change in temperature
from liquid to gas without change in temperature
Rate of evaporation increases as
the exposed surface area of the liquid increases
the exposed surface area of the liquid decreases
the movement of the air above the surface of the liquid decreases
The rate of evaporation decreases as
the temperature increases
the humidity (water vapor) of the surrounding air increases
the movement of the air above the surface of the liquid increases
The reverse process that involves changing a liquid to a solid is known as
melting
boiling
condensation
freezing
What happens to molecules when energy transfers out of a substance?
The substance's molecules will move faster.
The substances's molecules will move slower.
The substance's molecules will continue to move at the same speed.
The substance's molecules will stop moving.
What happens to molecules when energy transfers into a substance?
The substance's molecules will move faster.
The substances's molecules will move slower.
The substance's molecules will continue to move at the same speed.
The substance's molecules will stop moving.
What happens to molecules when the temperature drops or lowers?
The molecules get closer together
The molecules start moving faster.
The molecules stop moving.
The molecules become smaller.
In order to increase the speed of a substance's molecules, someone must...
transfer energy into the substance.
transfer energy out of the substance.
lower the temperature of the substance.
keep the temperature the same for the substance.
