Thermal Energy.

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Presentation transcript:

Thermal Energy

Review: Kinetic Molecular Theory Paticles that make up matter are constantly moving Higher amount of movement = higher amount of energy

Watch the following video: https://www.youtube.com/watch?v=vqDbMEdLiCs Stop at 1:52 to answer the following question Do you think the cake or the tin will be hotter? Why?

What is thermal energy? What is the difference between heat and thermal energy?

Thermal energy, Temperature, and Heat… oh my! In everyday life these terms are used interchangeably but in science each has very different meanings Thermal Energy: TOTAL energy of all the particles Temperature: a measure of the AVERAGE kinetic energy of the individual particles of a substance Heat: thermal energy moving from a warmer object to a cooler object.

Would we categorize thermal energy as kinetic or potential? BOTH! Kinetic because the particles within matter are moving. For example, if a solid is really hot the particles are wiggling really fast. Potential because the space between the particles are changing. As you squeeze and stretch these distances you store potential energy. Just like a spring.

Demo #1: Tin vs. Plastic At the same time, place one ice cube on the tin lid and one on the plastic lid. Time how long it takes for them to melt. Which one melted faster and why? Conductor will melt the ice faster (tin) because it transfer the heat faster to the ice cube.

Demo #2: Critical Thinking I’m making a cup of hot chocolate. I put hot water in and I am about to add the milk. Then my phone rings, it's my mother. I can't drink the hot chocolate while she is on the phone and the phone call will be at least 5 minutes long. Should I put the milk in now or in 5 minutes time in order to keep it as hot as possible? You should put the milk in right away because heat transfer depends on the difference between the two objects. The larger the difference the greater the heat transfer.

Demo #3: Insulator vs. Conductor Predict what will happen when the teacher brings the flame to the paper. Write down any observations