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WorksheetsEnergy and Phase Changes
Total questions: 43
Worksheet time: 31mins
True or False: Freezing in Chemistry means that something is cold.
True
False
How can you increase the Gravitational Potential Energy of a skate boarder?
I can increase the gravitational PE of the skater by making the skater move faster.
I can increase the gravitational PE of the skater by having the skater slow down.
I can increase the gravitational PE of the skater by having the skater go to the bottom of a ramp.
I can increase the gravitational PE of the skater by having the skater jump high in the air.
How can you increase Chemical PE? Choose all that apply.
Chemical potential energy can be increased by separating the particles that make up a substance
Chemical potential energy can be increased by bringing the particles of a substance closer together
Chemical potential energy can be increased by increasing the density of the substance
Chemical potential energy can be increased by decreasing the density of the substance
Chemical potential energy can not be increased
What happens to Potential Energy as you pull molecules apart?
Generally the farther apart the molecules, the more the Potential Energy there is
Generally the closer together the molecules, the more the Potential Energy there is
Chemical Potential energy does not change with distance between the particles
Which has a greater chemical potential energy? Explain why.
Water sample A: Mass: 5 grams Temperature: 4.0 °C Density: 1.000 g/mL
Water Sample B: Mass: 5 grams Temperature: 60.0 °C Density: 0.983 g/mL
Water sample A has a greater Chemical PE because it has a lower temperature
Water sample A has a greater Chemical PE because it has a higher density
Water sample B has a greater Chemical PE because it has a higher temperature
Water sample B has a greater Chemical PE because it has a lower density
Which particles have a greater average kinetic energy? Explain why.
Water sample A: Mass: 5 grams Temperature: 4.0 °C Density: 1.000 g/mL
Water Sample B: Mass: 5 grams Temperature: 60.0 °C Density: 0.983 g/mL
The particles in sample A have a higher average kinetic energy because the Temperature is lower.
The particles in sample A have a higher average kinetic energy because because it has a higher density
The particles in sample B have a higher average kinetic energy because the Temperature is higher.
The particles in sample B have a higher average kinetic energy because it has a lower density.
While melting, what kind of energy is the added heat being changed into?
Thermal energy, thus increasing the speed of the substance - we see this as a temperature change
Thermal energy, thus changing the distance between particles - we see this as a density change
Chemical potential energy, thus increasing the speed of the substance - we see this as a temperature change
Chemical potential energy, thus changing the distance between particles - we see this as a density change
What takes place when water changes from a liquid to a gas?
Condensation
Melting
Evaporation
Freezing
What takes place when water changes from a solid to a liquid?
Condensation
Melting
Freezing
Evaporation
What takes place when water changes from a solid to a liquid?
Condensation
Melting
Freezing
Evaporation
What takes place when water changes from a gas to a liquid?
Sublimation
Evaporation
Condensation
Melting
What is it called when the state of matter changes from a liquid to a solid?
Melting
Freezing
Condensation
Boiling
What phase of matter exists in part C of the graph?
Gas
Liquid
Solid
Plasma
What phase of matter exists in part D of the graph?
Gas
Liquid
Solid
Plasma
What phase of matter exists in part E of the graph?
Gas
Liquid
Solid
Plasma
In which region(s) does temperature increase? (a)
At which letter is the substance changing its state of matter?
A only
A, C, and E
D and E
B and D
During a phase change what happens to temperature? Think carefully about the phase change graph!
it increases
it decreases
depends; if being heated it increases, if being cooled it decreases
stays constant
Which phase change is being represented in the particle diagram?
melting
evaporation
condensation
freezing
In this phase change diagram, as you go from left to right, energy is being released. Determine at what temperature did this substance first become a liquid?
100 degrees C
120 degrees C
140 degrees C
160 degrees C
What can be seen once in a minute, twice in a moment, and never in a thousand years
A thought
The letter O
The letter M
Which is faster hot or cold?
Cold because it lacks thermal energy
Cold because of the theory of Newton's Laws of Motion
Hot because you can always easily catch a cold
What happens to the kinetic energy of molecules during a phase change?
Constant
Becomes zero
Decreases
Increases
What is kinetic energy?
The energy possessed by an object due to its temperature.
The energy possessed by an object due to its position.
The energy possessed by an object due to its shape.
The energy possessed by an object due to its motion.
Temperature is a measure of the average _____________ energy of the particles of a substance.
potential
kinetic
gravitational
heat
True or false: melting and freezing occur at the same temperature
True
False
I don't know
Which letter represents where vaporization is occurring?
A
B
C
D
E
Boiling and evaporation are forms of vaporization
True
False
What is the boiling point of the substance whose heating curve is shown in the image? For purposes of this question, just put the number, not the unit.
What is the melting point of the substance whose heating curve is shown in the image?
78 oC
400 oC
200 J
2000 J
What is the freezing point of the substance whose heating curve is shown in the image?
78 oC
400 oC
200 J
The freezing point cannot be found from a heating curve
Where on the graph where you would find the boiling point of the substance.
Mark on the graph where the potential energy of the substance is increasing significantly. Make sure to mark all locations possible!
Mark on the graph where the density of the substance is changing significantly. Make sure to mark all locations possible!
Mark on the graph where the kinetic energy of the particles in the substance is changing significantly. Make sure to mark all locations possible!
Mark on the graph where the Temperature of the substance is changing significantly. Make sure to mark all locations possible!
Which substance has the higher average particle speed?
A 10.0 g sample of solid aluminum at 660 oC, with a density of 2.70 g/mL
A 10.0 g sample of liquid aluminum at 660 oC, with a density of 2.38 g/mL
The liquid aluminum since it is a liquid
The solid aluminum since it has the higher density
The liquid aluminum since it has the lower density
Neither. They both have the same average particle speed because it is the same substance at the same temperature.
Which substance has particles with the higher average kinetic energy?
A 10.0 g sample of solid aluminum at 660 oC, with a density of 2.70 g/mL
A 10.0 g sample of liquid aluminum at 660 oC, with a density of 2.38 g/mL
The liquid aluminum since it is a liquid
The solid aluminum since it has the higher density
The liquid aluminum since it has the lower density
Neither. The particles of both substances have the same average kinetic energy because it is the same substance at the same temperature.
Which substance has the higher chemical potential energy?
A 10.0 g sample of solid aluminum at 660 oC, with a density of 2.70 g/mL
A 10.0 g sample of liquid aluminum at 660 oC, with a density of 2.38 g/mL
The liquid aluminum since it is a liquid
The solid aluminum since it has the higher density
The liquid aluminum since it has the lower density
Neither. They both have the same chemical potential energy because it is the same substance at the same temperature.
