TN Ready Science Review

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?

• The amount of kinetic energy in a system is a

  constant value

• An object can have potential energy or

  kinetic energy, but not both at the same time.

• Energy can be converted from one form into

  another, but it cannot be created or destroyed

• The amount of energy created when an object

  moves is equal to the energy destroyed when

  it stops moving.

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As Wilma holds a pan over a fire, the water begins to boil, as shown in the figure below. Which process is indicated by the letter X?

• radiation

• insulation

• convection

• conduction

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What is a population?

• a group of different species living in the same area

• a group of different species living in separated areas

• a group of individuals of the same species living in the same area

• a group of individuals of the same species living in separated areas

Which of the following organisms is most likely to be a pioneer species in an ecosystem?

• a tall tree

• moss

• a shrub

• a mouse

Which type of energy involves harnessing heat produced within Earth to generate electricity?

• solar energy

• nuclear energy

• geothermal energy

• hydroelectric energy

Runoff is most like which of the following?

• a puff of steam

• a flowing stream

• a cloud in the sky

• an invisible form of water

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Which of the following has elastic potential energy?

• a vase sitting on a shelf

• a stretched rubber band

• a child moving down a slide

• sugars stored in the molecules of food

How might acid rain harm the environment?

• It traps heat near Earth’s surface.

• It causes coal to burn less efficiently.

• It lowers the pH of bodies of water on the ground.

• It allows harmful radiation from the sun to reach Earth.

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Which of these resources is used to make plastics?

• coal

• uranium

• petroleum

• natural gas

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How would the introduction of an exotic species most likely affect an ecosystem?

• It would pollute the water or land.

• It would increase the available resources.

• It would compete with native species for resources.

• It would cause the size of the ecosystem to increase.

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