Science department

Grade 7

Evaluation Sheet

1. What is an alternative energy resource? A. an energy resource used in place of fossil fuels B. an energy resource that can be used to make fossil fuels C. an energy resource that is used faster than the rate at which it is replaced D. an energy resource that can be used without any negative impact on the environment

2. What is the difference between a conductor and an insulator?

A. Wood is a good conductor but not a good insulator. B. Metal is a good insulator but not a good conductor. C. A conductor transmits energy very well while an insulator does not. D. An insulator transmits energy very well while a conductor does not.

3. The law of conservation of energy describes how the amount of total energy can change in a closed system. Which of these statements correctly describes this law? A. The amount of kinetic energy in a system is a constant value. B. An object can have potential energy or kinetic energy, but not both at the same time. C. Energy can be converted from one form into another, but it cannot be created or destroyed. D. The amount of energy created when an object moves is equal to the energy destroyed when it stops moving.

4. Human activities involving fossil fuels can affect the environment in many ways. For example, drilling into land or the ocean floor can destroy habitats and pollute water and soil. Which of the following human activities does this example most likely describe? A. using fossil fuels B. obtaining fossil fuels C. transporting fossil fuels D. converting fossil fuels to usable forms

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5. The freezing point of corn oil is about 259 K. By how many degrees is this different from the freezing point of water on the Kelvin scale? A. 14 K B. 47 K C. 114 K D. 159 K

6. Which of these choices best describes the thermal energy of a substance? A. the sum of the kinetic energy of all of the particles of a substance B. the average kinetic energy of the particles that make up a substance C. the total kinetic and potential energies of the particles of a substance D. the difference between the kinetic energy and potential energy of a substance

7. Which change of state takes place when a gas loses energy? A. melting B. evaporation C. solidification D. condensation

8. These two beakers contain different amounts of water.

How does the temperature of the water in the large beaker compare or contrast with the temperature of the water in the small beaker? A. The water in the small beaker has a greater temperature than the water in the large beaker because the water in the small beaker has less mass.

2 B. The water in the large beaker and the water in the small beaker have the same temperature because the thermometers show the same readings. C. The water in the large beaker has a greater temperature than the water in the small beaker because the water in the large beaker has more thermal energy. D. The water in the large beaker has a greater temperature than the water in the small beaker because the water in the large beaker does not cool as quickly when heated.

9. A ball is sitting at the top of a ramp. As the ball rolls down the ramp, the potential energy of the ball decreases. What happens to the potential energy as the ball moves? A. It is lost as gravitational energy. B. It is converted to kinetic energy. C. It is destroyed as the ball moves. D. It is used to make the ball slow down.

10. This illustration shows four vehicles. Assume that they are all traveling at the same speed on a highway.

What do you know about the kinetic energy of the vehicles? A. The motorcycle has the most kinetic energy because it is has the least mass. B. All of the vehicles have the same kinetic energy because they are moving at the same speed. C. The delivery van has the greatest kinetic energy because its mass is greater than that of the other vehicles. D. The delivery van has the greatest kinetic energy because it has the most tires in contact with the pavement.

11. How many calories are needed to raise the temperature of 1 gram of water by 10 degrees Celsius? A. 0.1 cal B. 1 cal C. 10 cal

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D. 100 cal

12. Which energy resource supplies most of the energy needs for the United States? A. biomass B. fossil fuels C. solar energy D. wind energy

13. As energy in the form of heat is added to an ice cube, it begins to melt. What causes melting? A. Heat causes the molecules in the ice cube to expand and forces them apart. B. The transfer of thermal energy to the ice cube causes its molecules to move faster. C. Heat removes thermal energy from the ice cube and causes it to become liquid water. D. The additional energy causes the bonds between hydrogen and oxygen in the ice cube to break.

14. Laith notices that the air in his science classroom is much warmer than the air in his math classroom. Which statement describes how the air particles are different in his colder math classroom? A. They are vibrating. B. They move more freely. C. They move faster on average. D. They have less average energy.

15. A student is using the tool below to study a sample of matter.

What property of matter is the student measuring? A. mass

4 B. density C. volume D. temperature

16. Of the following lists, which is made up of three types of energy? A. electrical energy, magnetic energy, sound energy B. electronic energy, magnetic energy, thermal energy C. geothermic energy, mechanical energy, nuclear energy D. electromagnetic energy, mechanical energy, sound energy

17. How is a renewable energy resource different from a nonrenewable energy resource? A. Renewable resources come only from plants. B. Renewable resources exist in unlimited supplies. C. Renewable resources do not have costs associated with them. D. Renewable resources can be replaced at the same rate at which they are used.

18. Eduardo puts a beaker of ice and water on a hot plate as shown. After a few minutes, only liquid water is in the beaker. Eventually, the water boils.

What is the difference between the temperature at which the ice melts and the temperature at which the water boils? A. 0 °C B. 32 °C C. 100 °C D. 273 °C

19. How does the use of biomass energy to generate electricity harm the environment the most?

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A. Biomass energy production can destroy habitats. B. Biomass energy production can create erosion problems. C. Biomass energy production can contribute to air pollution. D. Biomass energy production can generate hazardous waste.

20. Gordon throws a baseball into the air. It rises, stops when it reaches its greatest height, and then falls back to the ground. At what point does kinetic energy convert to potential energy? A. when the baseball is rising B. when the baseball is falling C. while the baseball sits on the ground D. while the baseball is stopped in the air

21. Which of the following is the most common way that obtaining fossil fuels negatively affects the environment? A. It requires drilling into land or the ocean floor. B. It disrupts the migration patterns of fish and other animals. C. It causes the release of greenhouse gases into the atmosphere. D. It produces radioactive wastes that are harmful for many years.

22. As liquid water loses energy in the form of heat, the water begins to freeze. What causes freezing? A. The loss of thermal energy from the water causes its molecules to move slower. B. Heat removes thermal energy from the liquid water and causes it to become an ice cube. C. The loss of heat causes the molecules in the ice cube to contract and forces them together. D. The lost energy causes the bonds between hydrogen and oxygen in the liquid water to break.

23. While on vacation, Carine rides in a hot-air balloon. To make the balloon rise, the pilot turns on a flame to warm the air inside the balloon. How does the air change? A. The temperature of the air decreases. B. The air particles move closer together. C. The motion of the air particles increases. D. The air changes to a different state of matter. 6 24. Which form of energy is due to the motion of an object's particles? A. chemical energy B. electromagnetic energy C. mechanical energy D. thermal energy

25. How can a renewable energy resource become nonrenewable? A. It is used faster than it can be replaced. B. It has negative effects on the environment. C. It is purchased and controlled by a single company. D. It is found in a location that makes it difficult to obtain.

26. Which best describes the use of nuclear energy as an energy source when compared to fossil fuels? A. Nuclear energy destroys more habitats. B. Nuclear energy produces less air pollution. C. Nuclear energy creates more land erosion. D. Nuclear energy produces less harmful waste on land

7 27.cancelled 28. Which of these is the smallest particle to retain the properties of an element? A. an atom B. a proton C. a molecule D. an electron

29. The diagram below is one model of an atom.

By whom was this model of an atom proposed? A. Thomson C. Rutherford B. Dalton D. Bohr 30. In a neutral atom, the number of electrons equals the number of what other part? A. protons B. nuclei C. neutrons D. energy levels 31. Which of the following terms means the amount of energy needed to raise the temperature of 1 gram of water by 1 degree Celsius? A. heat B. temperature C. thermal energy D. calorie

32. Which of the following is the transfer of energy as heat by the movement of a liquid or gas? A. conduction B. convection C. emission D. radiation

82 33. .How could two objects have the same temperature but different thermal energies? A. One object could have more heat. B. One object could have more calories. C. One object could have more particles and lesser total kinetic energy. D. One object could have more particles and greater total kinetic energy.

34. What is any energy resource that can be used in place of fossil fuels called? A. alternative energy B. nuclear energy C. solar energy D. biomass energy 35. Energy exists in different forms. Which of the following forms of energy best describes the energy stored in food? A. electromagnetic energy B. sound energy C. mechanical energy D. chemical energy Answer the following questions in the space provided.

1- The temperature of a beaker of water is 87°F.

How many degrees cooler would the water have to be to freeze? 87-32= 55°F.

How many degrees warmer would the water have to be to boil? 212-87= 125°F. ______

2. Substances freeze and boil at different temperatures. What are the freezing and boiling points of water on the Kelvin scale? 273K-373K ______3. The temperature of a substance is 75 K. How much higher or lower is this from the freezing point of water and from the boiling point of water? Answer it by the same way of number 1

82 4. A student wants to test heat transfer in different materials. She places four spoons in a bowl of hot water, as shown below. She then makes a data table to record her observations.

Material Observation Plastic slightly warm stainless steel Hot Silver very hot Wood not warm

Identify and describe the type of heat transfer that occurs between the hot water and the spoon Conduction After the spoons have been in the water for a couple of minutes, what will the student most likely observe about the temperature of each spoon? The temperature of the spoons increased Classify each of the materials that the student is testing as a conductor or an insulator. Insulators : plastic, wood Conductors: stainless steel, silver 5. Describe the law of conservation of energy. From the text book ______

82 ______

6.Give two examples of energy being transformed from one type to another Electric fan Electric to kinetic energy Photosynthesis Solar to chemical energy

The rest of the question are answered through the textbook and booklet

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