2.2 Phase Change Diagrams Accommodated

DIRECTIONS: Carefully review the diagrams below in order to answer the questions.

FACILITATOR SCRIPT: 
Read each question aloud or ask a group member to read for the group.
Allow 1-2 minutes for each group member to answer the question. Ask if the group is ready and have group members share responses.  
Ask if any group members have questions before moving on to the next question.
(Harmonizer shares screen to make it easier for the group to stay at the same pace while working)

1

Label each arrow (D, E, F, G) in Model 1 with the appropriate phase change (fusion/melting, freezing, vaporization/boiling, condensation).

fusion/melting (solid-->liquid)
freezing (liquid --> solid)
boiling (liquid --> gas)
condensation (gas --> liquid)

Arrow D
Arrow E
Arrow F
Arrow G

1

Which processes in Model 1 are endothermic? (Endothermic- Energy is added or absorbed by the system)

1

Which processes in Model 1 are exothermic? (Exothermic- Energy is released by the system, particles)

Review OPTIC and Model 2 below. Use Optic to answer the following questions 4-9. NOTE: PE = potential energy,  KE= kinetic energy which is the same as temperature

1

Overview: What do you notice about what the graph in model 2 is showing? I notice...

1

Parts: What does the x and y axis represent? X axis represents- Y axis represents-

1

Title: What new information or understanding can you get from the title of the graph? The title let's me know that this is about...

1

Interrelationships: What patterns do you notice? Try to record at least 2. One pattern I notice is... Another pattern is... (Hint: Do you notice anything that is similar on the graph? What is it?)

1

Conclusions: Are there any conclusions you can make from analyzing the graph? One conclusion I can make is... (Hint: In general what information is the graph showing? What do you think is 1-2 main takeaways that you need to remember about this graph?)

1

Questions: What questions or wonderings do you have about the graph? One question I have is...

Use both model 1 and 2  below to answer the remaining questions.  NOTE: PE = potential energy,  KE= kinetic energy which is the same as temperature

1

Does the kinetic energy of molecules increase, decrease, or remain the same when the substance melts or boils? (Hint: KE is the same as the temperature)

1

Does the kinetic energy of molecules increase, decrease, or remain the same when the substance freezes or condenses? (Hint: KE is the same as the temperature)

1

Does the kinetic energy of molecules increase, decrease, or remain the same AFTER the substance completely freezes and turns from a liquid to a solid? (Hint: KE is the same as the temperature)

1

How do you know that energy is added (endothermic) in order for the substance to change from a solid into a liquid? Use at least 2 pieces of evidence from the model and graph to explain your reasoning. (Hint: One piece of evidence is that the temperature increases on the graph from solid to liquid, try to find another piece of evidence)

1

How do you know that energy is released or removed (exothermic) in order for the substance to change from a gas into a liquid? Use at least 2 pieces of evidence from the model and graph to explain your reasoning. (Hint: One piece of evidence is that the temperature decreases on the graph from gas to liquid, try to find another piece of evidence)

1

THINK ABOUT IT! Line segment DE is longer than segment BC. What do you think this might mean? Hint: Think about differences in the amount of energy added to the system.

1

THINK ABOUT IT! Why do you think the temperature remains the same during a phase change (melting, freezing, boiling, condensing)? Hint: How is the energy changing in the system during this time if it's not causing the temperature to increase or decrease?

1

Select all the responses that are true when this substance vaporizes or boils. (Hint: This is during a phase change, so look carefully at the graph. What happens to temperature during a phase change? Use this to help you determine which choices are correct)

1

2.2 Phase Change Diagrams Accommodated

Label each arrow (D, E, F, G) in Model 1 with the appropriate phase change (fusion/melting, freezing, vaporization/boiling, condensation).

Which processes in Model 1 are endothermic? (Endothermic- Energy is added or absorbed by the system)

Which processes in Model 1 are exothermic? (Exothermic- Energy is released by the system, particles)

Overview: What do you notice about what the graph in model 2 is showing? I notice...

Parts: What does the x and y axis represent? X axis represents- Y axis represents-

Title: What new information or understanding can you get from the title of the graph? The title let's me know that this is about...

Interrelationships: What patterns do you notice? Try to record at least 2. One pattern I notice is... Another pattern is... (Hint: Do you notice anything that is similar on the graph? What is it?)

Conclusions: Are there any conclusions you can make from analyzing the graph? One conclusion I can make is... (Hint: In general what information is the graph showing? What do you think is 1-2 main takeaways that you need to remember about this graph?)

Questions: What questions or wonderings do you have about the graph? One question I have is...

Does the kinetic energy of molecules increase, decrease, or remain the same when the substance melts or boils? (Hint: KE is the same as the temperature)

Does the kinetic energy of molecules increase, decrease, or remain the same when the substance freezes or condenses? (Hint: KE is the same as the temperature)

Does the kinetic energy of molecules increase, decrease, or remain the same AFTER the substance completely freezes and turns from a liquid to a solid? (Hint: KE is the same as the temperature)

THINK ABOUT IT! Line segment DE is longer than segment BC. What do you think this might mean? Hint: Think about differences in the amount of energy added to the system.

THINK ABOUT IT! Why do you think the temperature remains the same during a phase change (melting, freezing, boiling, condensing)? Hint: How is the energy changing in the system during this time if it's not causing the temperature to increase or decrease?

Select all the responses that are true when this substance vaporizes or boils. (Hint: This is during a phase change, so look carefully at the graph. What happens to temperature during a phase change? Use this to help you determine which choices are correct)

This is your space to record any notes or information you want to include about this formative that might be helpful for your studying.

Label each arrow (D, E, F, G) in Model 1 with the appropriate phase change (fusion/melting, freezing, vaporization/boiling, condensation).

Which processes in Model 1 are endothermic? (Endothermic- Energy is added or absorbed by the system)

Which processes in Model 1 are exothermic? (Exothermic- Energy is released by the system, particles)

Overview: What do you notice about what the graph in model 2 is showing? I notice...

Parts: What does the x and y axis represent? X axis represents- Y axis represents-

Title: What new information or understanding can you get from the title of the graph? The title let's me know that this is about...

Interrelationships: What patterns do you notice? Try to record at least 2. One pattern I notice is... Another pattern is... (Hint: Do you notice anything that is similar on the graph? What is it?)

Conclusions: Are there any conclusions you can make from analyzing the graph? One conclusion I can make is... (Hint: In general what information is the graph showing? What do you think is 1-2 main takeaways that you need to remember about this graph?)

Questions: What questions or wonderings do you have about the graph? One question I have is...

Does the kinetic energy of molecules increase, decrease, or remain the same when the substance melts or boils? (Hint: KE is the same as the temperature)

Does the kinetic energy of molecules increase, decrease, or remain the same when the substance freezes or condenses? (Hint: KE is the same as the temperature)

Does the kinetic energy of molecules increase, decrease, or remain the same AFTER the substance completely freezes and turns from a liquid to a solid? (Hint: KE is the same as the temperature)

THINK ABOUT IT! Line segment DE is longer than segment BC. What do you think this might mean? Hint: Think about differences in the amount of energy added to the system.

THINK ABOUT IT! Why do you think the temperature remains the same during a phase change (melting, freezing, boiling, condensing)? Hint: How is the energy changing in the system during this time if it's not causing the temperature to increase or decrease?

Select all the responses that are true when this substance vaporizes or boils. (Hint: This is during a phase change, so look carefully at the graph. What happens to temperature during a phase change? Use this to help you determine which choices are correct)

This is your space to record any notes or information you want to include about this formative that might be helpful for your studying.