Vocabulary
3 Types of Heat Transfer
Molecular Movement
Analyzing Heat Transfer
Thermal Energy vs Temperature
100
The total amount of kinetic energy in a substance
Thermal Energy
100
When you touch a hot stove and burn your hand, this is an example of what kind of heat transfer?
Conduction
100
True or False: All molecules are always moving.
True
100
Heat transfer is really neat, it always goes from...
HOT TO COLD
100
Distinguish between thermal energy and temperature.
Thermal Energy = total KE
Temperature = average KE
200
The average of the kinetic energy of a substance
Temperature
200
The sun transfers energy to Earth's surface through which type of heat transfer?
Radiation
200
Which of these images represents the molecules of a gas? Explain.
The third image represents a gas because the molecules are moving freely and away from each other.
200
Your teacher has a headache because her students keep shouting "Lebron" all day while she tries to teach. Describe the heat transfer happening between the ice pack and her face.
Heat energy is transferring from her forehead to the ice pack. This causes her forehead to decrease in temperature while the ice pack increases in temperature. Heat always moves from hot to cold.
200
Which has more thermal energy: the penguin or the iceberg? Explain.
The iceberg has more thermal energy because it has more molecules (more TOTAL KE).
300
Something that speeds (accelerates) energy transfer
conductor
300
A pot of boiling water has molecules that are rising and falling due to different densities. This is an example of what kind of heat transfer?
Convection
300
As a pot of room temperature water is heated up, describe the movement of its molecules and include the words kinetic energy.
The molecules speed up and gain kinetic energy as it is heated up.
300
Examine this glass of ice water. Describe the heat transfers that will occur if it is left at room temperature for 30 minutes.
Heat will transfer from the air to the water and from the water to the ice cube. This will cause the ice to melt over time. Heat always moves from hot to cold.
300
Immediately after being scooped out of the big pot of porridge, describe the thermal energy AND temperature of each of these bowls.
They all start at the same temperature, but the biggest bowl has the most molecules and therefore most thermal energy. Medium bowl has the second most molecules and thermal energy, smallest bowl has the least molecules and least thermal energy.
400
Something that slows down energy transfer
Insulator
400
Draw a picture and label examples of all THREE types of heat transfer.
400
Describe the movement of molecules in a solid, liquid, and gas.
Molecules in a solid are vibrating in place, molecules in a liquid are moving around each other, and molecules in a gas are moving away from each other.
400
What is wrong with this version of the story? Use at least 2 vocabulary words.
The biggest bowl has the most THERMAL ENERGY since it has the most MOLECULES so it will take the longest for it to cool down. The biggest bowl should have had the highest TEMPERATURE.
400
What does a thermometer measure?
The average kinetic energy of molecules of a substance
500
Give the ENTIRE law of conservation of energy.
Energy cannot be created or destroyed but it can change forms.
500
Use the word "density" to explain what is happening inside of this cup of hot tea.
The water is being heated up by the flame. As it is heated, the molecules move apart and it becomes less DENSE and rises up. Further from the heat source, it cools off and molecules move closer together becoming more DENSE and then fall back to the bottom. This pattern repeats.
500
Draw a model of the hot vs cold water where food coloring was added, including showing how the molecules move in each.
In this model, the arrows represent the SPEED of the molecules.
500
Describe a real life example (involving snow) where heat transfer happened. Use at least 3 vocab words.
Ex: I built a snowman the other day. When I stepped outside, the heat from my body immediately started transferring to the air around me. This is because my MOLECULES had more average KINETIC ENERGY than the ice cold air around me. My gloves were great INSULATORS because they slowed the transfer of heat from my hands to the air. My exposed skin was a CONDUCTOR because heat quickly moved from my face to the air.
500
Describe an example where two objects have the SAME temperature but different amounts of thermal energy.
Ex: My backpack is about 70 degrees (room temp) and so is the air in the school building. The air in the school building has more thermal energy, because it is made of more molecules than my backpack.