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Week 4 Science: Heat Transfer

Last updated almost 2 years ago
20 questions
Welcome Back!
This Week 4: Heat Transfer lesson has a short video, a couple of short readings, and about 16 questions. There is an optional experiment at the end you can do with an adult's permission and supervision.
Be sure to attempt all the questions and submit when you are finished. Please contact me through the comment feature or send an email to rshaw@fergflor if you have any questions.
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1

Take a photo or draw an example of each type of heat transfer: convection, conduction, and radiation.

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1

Explain the difference between each of the three types of heat transfer.

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1

Find something to touch that is cooler than you and something else that is warmer than you.
Why do things feel cool and other things feel warm when you touch them?

Thermodynamics

As you know, energy cannot be created or destroyed. So what happens to energy when an object is heated or cooled? Let’s think about what happens when you place your hands around a mug of hot chocolate. Is heat energy released to the surroundings (your hands), or is it absorbed by the hot chocolate? Your hands start to warm up from holding the hot chocolate, therefore the heat energy must be released by the hot chocolate and absorbed by your hands. This physical reaction is called exothermic.
Thermodynamics is the science that deals with the relationship between heat, pressure, density, and temperature in a substance. Thermodynamics specifically focuses largely on how the transfer of heat is related to various energy changes within a physical system. Those changes in heat usually result in work being done by the system. The changes are guided by the laws of thermodynamics.
An exothermic reaction can be a chemical or a physical object that releases heat energy to its surroundings. The opposite of this reaction is endothermic. An endothermic reaction absorbs heat from its surroundings. Figure 1 shows an example of exothermic and endothermic phenomena you are probably familiar with.
Heat and temperature are not the same thing. Heat is a form of energy; it is measured in calories or joules. Temperature is a measure of the average kinetic energy of the particles in a substance; it is measured in kelvins or degrees.
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Required
1

When a cold stick of butter is left out on the kitchen counter ___________.

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1

What happens if a metal object heated to 130° Celsius is placed in a container of water that is 24° Celsius?

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1

A cup of hot coffee is placed on the counter in a room that is about 22° Celsius. How would you describe the energy of the cup of coffee after two hours?

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1

Insulator

1

What does thermodynamics say about the flow of energy between two objects of different temperatures?

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What kind of heat (energy) transfer is making the sun tea brew? (check all that apply)

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If a person places one end of a solid metal bar into a fire, the end that is not in the fire also gets hot. Which of the following methods of energy transfer does this describe?

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1

Which of the following is an example of convection?

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1

If you sit in a cold metal chair on your back porch when it's 36°F outside the heat will move...

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1

What are the 3 ways heat moves (check all that apply)

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Heat will continue to move between objects until ________ is reached? (hint, see page 1 of the reading)

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Conduction can move heat through (check all that apply)

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1

Convection can move heat through (check all that apply)

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0

Are there any concepts in this reading that are still unclear or that you need help with?

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1

What method of energy transfer is primarily responsible for moving energy from the Sun to Earth?

Optional Acivity to Try at Home! (with adult supervision): Make SUN TEA!

Use the sun's energy to brew tea.

1. Put 4 to 8 tea bags into a santitized 2 quart or gallon glass container (use fewer teabags for a smaller container: 4 teabags for a 2 quart container, 8 tea bags for a gallon container).
Always use a glass container or BPA-free container. Do not use single use plastic water bottle.
2. Fill with water and cap.
3. Place outside where the sunlight can strike the container for about 3 to 4 hours. Move the container if necessary to keep it in the sun. Leaving tea out for too long, brewing in plastic, or not cleaning your sun tea container can cause bacteria to grow into ropey strands or white spots, or make it thick or syrupy consistency; if it does, discard it.
4. When the tea has reached its desired strength, remove from sun and put it in the refrigerator. You may or may not want to remove the tea bags at this point. I usually don't. The tea will probably taste more mellow than what you are used to from using boiling water. The slow steeping has a way of bringing out a slightly different flavor from the tea. Also, because you didn't use boiling water, you should refrigerate the tea and drink it up pretty quickly - a day or two. It will not keep as well as iced tea made from boiling water. I usually make sun tea with various kids of tea, but black tea and green tea are my favorites.
5. Pour the tea into a clear glass. Take a close look to make sure the tea does not have any bacteria as explained above. Add ice and sometimes sweetener or sprigs of mint and enjoy.


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1

How are the lessons going for your so far this summer?

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How long did this lesson take you to complete today?