Ice Melting Post-Video Lesson

Ice Melting Post-Video Questions

By Ilias Saldana

In the video you watched of Ice Melting, you watched the ice melt while sitting on a desk at room temperature. Summarize how the temperature changed over the course of the video. Discuss with your neighbor.

Think back to the video you watched.

Open Ended

At what point did the temperature finally start to increase?

If we were to graph the change in temperature over time, it would look something like this.

Graphing the temperature change

Multiple Choice

In the graph you just looked at, which variable was on the y-axis?

• temperature

• time

• heat

• ice

In the video you watched, we stopped when the temperature reached 17 degrees Celsius, which is a bit below room temperature. If we had let heat continue to flow into the water, the temperature would continue to increase. But would it keep increasing temperature forever?

Imagine I had transferred the water into a small pot and left it on the hot stove for 30 minutes. What would happen to the water eventually? Discuss with your neighbor.

What if we kept heating the water?

Open Ended

What would happen to the water eventually?

While the ice was melting, it was changing phase between solid and liquid. While watching the video, you answered some questions about what the particles were doing during this time, and what they weren't doing.

Try to remember what we said the particles were doing while the ice was melting. Discuss with your neighbor.

Phase changes

Open Ended

While the ice was melting, the particles were...

So then, while a substance is changing its state of matter, its particles do not change how much kinetic energy they have. They only change how they are spaced.

What happens to particles during phase changes?

What would you expect to happen to the temperature of the water once it starts boiling? Discuss with your neighbor.

So, thinking about our water boiling again...

Multiple Choice

Predict what would happen to the temperature.

• The temperature of the water will increase as the water boils

• The temperature of the water will decrease as the water boils

• The temperature of the water will stay the same as the water boils.

We should expect, then, that the temperature will increase once all the ice is melted, but then stop increasing while boiling occurs.

What would this look like on a graph?

Notice that I changed the x-axis since the last time you looked at this graph. Now, it says "heat transferred to cup."

If heat is transferring into the cup the whole time, this means that the water must be gaining energy the entire time, right?

And yet, the temperature of the water doesn't change for big portions of the graph. This suggests that even thought the particles ARE gaining energy, they are NOT gaining kinetic energy.


Take your time on this slide. Reread it if you need to.

The link on the next slide will take you to a simulation where you can observe how particles change their behavior as they gain or lose energy.

Play around with the different options and make some observations about what happens.

As you explore, make an "I notice... I wonder" chart to keep track of your learning.

Simulation

Let's call the energy gained by the water "phase energy."

The water is using the energy it gains to change the phase of matter its in.

So, depending on what region of the graph we're in, the water is either gaining Kinetic Energy or its gaining Phase Energy, but never both at the same time.

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Wait for your neighbor to finish exploring the simulation, then share some items from your chart with them. On the next slide, I'll ask you to share some of your chart with me.

Open Ended

What are some things you NOTICED while exploring the simulation?

Open Ended

What are some things you WONDERED about while exploring the simulation. What questions might you have about what you observed?

Open Ended

What are two things you learned from going through today's lesson?

Thanks for your time! That's all I got for you today.