Thermal Energy Phase Change Review Lesson

​ Thermal & Kinetic Energy Quick Review

Thermal Energy and Matter

We can add Thermal Energy to something and things can change. When we add enough TE to a solid, for example, we can witness a phase change to a liquid. Add enough TE to a liquid? Gas.

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Remember...

​Energy is just that--it's energy. NOT MATTER!

Energy comes in many forms--for this unit, we have focused on Thermal Energy and Kinetic Energy the most.

Energy is NOT a phase or state of matter.

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THEY ALL WILL INCREASE!

Thermal Energy OR

Kinetic Energy OR

Particle Motion OR

Temperature

Then....

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If you increase...

Thermal Energy, Kinetic Energy, Temperature, and Particle Motion

Multiple Choice

What state is model B?

• Liquid

• Solid

• Gas

Multiple Choice

Kinetic Energy is the energy of...

• Motion

• Heat

• Sound

Multiple Choice

Energy comes in the form of...

• Heat, Light, and Sound

• Heat and Light

• Sound, Matter, and Heat

• Heat and Light

Multiple Choice

Thermal Energy is...

• The total amount of Kinetic Energy in an object/system

• The average amount of energy in an object system

• The energy of light

• Chemical energy

​Each state/phase of matter has a specific arrangement. Solids, liquids, and gasses all look differently at the molecular level. We can analyze these structures to see what state we are dealing with.

​States of Matter

Multiple Choice

Did we add or remove Thermal Energy to this substance?

• Add

• Remove

• No Change

Multiple Choice

When I place a hot bowl of soup in the fridge, what will happen to it's particle motion?

• Nothing

• It will decrease.

• It will increase.

Phase Change Diagrams

​Quick Recap...

​During yesterday's lab, your data should have made a graph that looked something like this... ---->

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​This is a phase change diagram

​Phase Change Diagrams

• ​Write this on your Notes Paper

• ​Graphical representation of matter changing states

• ​Compares the temperature (y axis) and the time (x axis)

• ​As temperature increase - energy increases

  • ​Molecules can "break free" and change to a new state of matter​

• ​Shows specific temperatures (melting, boiling, etc.) and the states of matter!

​Sample Diagram

Multiple Choice

Is the graph pictured Endothermic or Exothermic?

• Endothermic

• Exothermic

​Phase Change Diagram

​​Write this on your Notes Paper

• Endothermic!

• ​The temperature is increasing, so energy is being absorbed

Multiple Choice

What state of matter would this substance be between points A & B?

• Solid

• Liquid

• Gas

​Phase Change Diagram

​Solid!

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​The substance is at it's coldest temperature here, resulting in Solid Matter

​

​**Draw/highlight on your graph what you see on the right**

Multiple Choice

What state of matter would this substance be between points C & D?

• Solid

• Liquid

• Gas

​Phase Change Diagram

Liquid!

​

The temperature has increased past it's melting point.

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​**Draw/highlight on your graph what you see on the right**

Multiple Choice

What state of matter would this substance be between points E & beyond?

• Solid

• Liquid

• Gas

​Phase Change Diagram

Gas!

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The temperature is at its highest, which means it has a lot of energy.

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​**Draw/highlight on your graph what you see on the right**

​Phase Change Diagram

Write this on your notes paper:

• ​The flat plateaus - specific temperatures (melting and boiling points)

  • ​In an exothermic graph - freezing and condensation points

• ​​Where molecules start to "change" into the next state of matter

• ​**Draw/highlight on your graph what you see on the right**