Heat and Matter Exam Review

Heat and Matter Exam Review

Word Cloud

What comes to mind when you think of the phrase: Thermal Energy.

Poll

Do you think the total energy of a system is the same as the temperature of the system?

• Yes

• No

Total Energy of a System

Is the temperature of a substance the same as the total energy of the system?

The temperature is only PART of the total energy of a system. Total energy of the system also takes into account how big the system is.

Which system has more total energy? A large pot of boiling water over fire, or a small pot of boiling water over fire?

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Poll

Which system has more total energy?

• Small pot of boiling water over fire

• Large pot of boiling water over fire

Even though both pots have boiling water, the larger pot simply has more water and thus, more energy in total.

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A large pot of boiling water has more total energy

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Let's talk about heat

​In science, heat means the transfer of thermal energy from an object that has a higher temperature to an object that has a lower temperature.

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Heat means something else in science

Poll

When you touch an ice cube, which way does thermal energy flow?

• From the ice cube into my hand

• From my hand into the ice cube

• Thermal energy does not flow

• Thermal energy flows both ways

Thermal energy flows from hotter objects to cooler ones.

Draw

Thinking about the previous question about your hand and an ice cube: draw a diagram showing how thermal energy flows between the ice cube and your hand.

Poll

What temperature does the thermometer show us?

• 70

• 74

• 72

• 75

Now let's talk about conductivity

https://youtu.be/lvAKQt0Qa4E?si=Af1c5p7gfbFI1nA-

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Here is a video showing Conductivity

Thermal Conductivity refers to how well a material can transfer thermal energy. Materials that transfer thermal energy quickly are good conductors.

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​Thermal Conductivity