Unit 4- Energy Transfer Exam-7th Grade 2024

Adding or removing heat from a system may result in a temperature change. Ben found a penny outside on the hot sidewalk. He brought it inside and added it to a cup of room temperature water. What will happen to the penny’s temperature once he puts it in the cup of water?

• the heat will transfer from the penny to the water

• the heat will transfer from the water to the penny

• the penny will not change temperature

• the penny will change state

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Jonathan performed an experiment using a heating lamp, a cup of water (A), an empty cup (B), and two thermometers as shown in the illustration below. After 40 minutes he observed the temperature inside each cup. Based on the illustration, what do you think Jonathan observed at the end of his experiment?

• The temperature measured in Cup A is higher than Cup B.

• The temperature measured in Cup A is lower than Cup B.

• The temperatures in Cup A and Cup B are the same.

• The temperatures in Cup A and Cup B did not change.

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The transfer of energy as heat occurs all around us. When a warmer stream flows into a cooler lake, which of the following happens?

• The stream water absorbs cold from the lake water.

• The lake water transfers heat to the stream water.

• The stream water transfers heat to the lake water.

• The lake water absorbs cold from the stream water.

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A large piece of a glacier broke off into the ocean. Which of the following actions would you predict will happen with the ocean water?

• Heat will flow from the water to the ice.

• Heat will flow from the ice to the water.

• Cold will flow from the water to the ice.

• Cold will flow from the ice to the water.

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Which statement is accurate according to the Law of Conservation of Energy?

• Energy cannot be created.

• Energy cannot be changed.

• Energy cannot be converted.

• Energy cannot be transformed.

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Mark rubs his hands together quickly on a winter evening. Why does rubbing your hands together help warm them?

• heat is absorbed from the air by the hands

• heat is generated by mechanical energy (friction) being converted to heat energy

• heat is conducted between two hands when they are touching

• heat is transferred back and forth between two hands when they are close together

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Temperature changes may result from adding or removing heat from a system. Which of the following does temperature measure?

• The state of matter that makes up the object

• He electrical energy that is present in the object

• The energy transferred when an object changes state

• The average kinetic energy of the particles that make up the object

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When you bend a glow stick, a small chamber inside breaks, releasing a substance that reacts with other substances inside the glow stick. The reaction that takes place causes the glow stick to glow. What energy transformation takes place when a glow stick lights up?

• sound energy to light energy

• chemical energy to light energy

• thermal energy to light energy

• electrical energy to light energy

When we eat, a chemical reaction occurs in our bodies. According to the Law of Conservation of Energy, what happens to the food we consume?

• it is destroyed during digestion

• it is created in our cells

• it is turned into oxygen gas for us to breathe

• it is broken down and converted into usable energy

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Friction is a force that opposes motion. When friction is present, heat is usually generated. According to the Law of Conservation of Energy, which of the following statements is accurate about the energy associated with friction?

• The Law of Conservation does not apply.

• It was not transformed from another type of energy.

• The energy is converted into thermal energy.

• Energy is created as heat.

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