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Thermal energy 8th
Thermal energy 8th g
| Question | Answer |
|---|---|
| The method of heat transfer by which the sun warms the earth is | radiation |
| The process by which hot and cold air are transferred in the atmosphere is | convection |
| A new type of oven that cooks food quickly and more completely is the convection oven. The key difference in this type of oven and a regular oven is that it | circulates the hot air |
| Microwave ovens heat food through the process of | radiation |
| The sun heats Earth mainly through | radiation |
| What is the main method of heat transfer from the core to the crust of Earth? | convection |
| Heat from the sun moves through space by the process of | radiation |
| The process of heat radiation is the ONLY method of heat transfer that can occur | through space |
| Two iron rods are placed horizontally, touching end-to-end. One end of one rod is heated. After some time, the other rod also feels warm to touch. How did the heat travel from the heated rod to the one that was not heated? | The molecular movement in the first rod transferred energy to the molecules in the second. |
| Heat would best be transferred by conduction between | a stove and a copper pot |
| Conduction occurs more easily between solids and liquids. This is because the particles in gases are | farther apart and move faster. |
| The name for heat transfer between two solids which are in direct contact or touching one another is | conduction |
| Molecules of two solid substances actually collide with each other to transfer energy in this method of heat transfer. | conduction |
| When ironing clothes, the primary method of heat transfer is | conduction |
| Why does a metal spoon left on a bowl of hot soup become warm? | metal is a conductor |
| Which material would be BEST to use for heating up food? | Aluminum |
| Marina is cooking soup in a pot on the stove. The pot is in direct contact with the stove. In this case, heat energy is transferred to the soup by | conduction |
| Marina is using a metal spoon to stir her soup. Why does the spoon feel warm? | heat energy from the soup is transferred to the spoon |
| Bruce left some butter out in his kitchen. Bright sunlight came in through the window and melted the butter. Heat energy from the sun is called | radiation |
| Burning logs in the fire place produce heat energy. We get warm from the fire when heat energy is transferred by | radiation |
| An alligator is cold blooded. When it is cold, the alligator looks for a warm place to lay, like on the sand or a rock warmed by the sun. How does the sand or the rock warm the alligator? | direct contact or conduction |
| When light from the sun warms the ground, the transfer of heat energy is called | radiation |
| A cold cast iron skillet is placed onto a stove top. When the stove is turned on, the skillet becomes very hot. Why does the skillet become hot? | The skillet is gaining energy (heat) from the stove. |
| Energy is transferred in solids by conduction, which means that | heat travels from the hotter object to the cooler object |
| Which observation would be evidence that heat was transferred by radiation? | A car with the windows rolled up gets very hot on a summer day |
| A tank of water is separated into two sections. Hot green water is placed on one side of the tank and clear cold water is placed on the other side. What would you predict will happen when the partition separating the tank is removed? Why? | You will see the green colored water move and mix with the cold water due to convection |
| Which statement would be the best evidence that heat transfer through radiation has occurred and why? | At several feet from a fire, you still feel the heat. Heat is transferred through the air. |
| Based on the principles of convection, conduction and thermal radiation, which scenario below is most similar to the following situation? Heating a tin can of water using a bunsen burner | Feeling a metal wire get warmer as you roast a marshmallow over a fire. |
| What type of heat transfer is used to fry an egg in a pan and how can you tell? | It is conduction because the egg is touching the pan |
| Which would be best categorized as heat transfer by conduction? | Feeling the heat from a light bulb with your hand when touching the bulb |
| Which would be best categorized as heat transfer by convection? | Noodles rising and falling in a pot of boiling water |
| In nature, hot air tends to rise and cool air tends to sink. This is behind the concept of convection heating that is used in ovens. Convection currents occur only in fluids such as liquids and gases but not in solids. What is an example of convection? | heating a fish tank. |
| Susan needs to bake lots of cookies for a party. Explain why the temperature in the kitchen became uncomfortably high by the time Susan was ready to cook her fourth batch of cookies. | heat from the oven kept coming out of the oven and heated up the kitchen |
| Betsy was stirring a pot of hot soup with a large, metal spoon. She left the spoon in the soup. When she came back, the spoon felt very hot. Why? Would a wooden spoon left in hot soup feel warm too? Why? | Metal is a conductor so the heat from the soup transferred to the metal and made the spoon hot. Wood is an insulator so no, a wooden spoon would not get hot. |
Created by:
kristikee