EOG Review 8th grade Science

Earth's air is made up of molecules of different gases that are not joined chemically. Which term best desrves air?

• compound

• mixture

• pure substance

• element

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8.P.1.1

Which statement best describes the periodic table?

• Each vertical column forms a period.

• The number of electrons decreases from left to right.

• The atomic mass decreases from left to right.

• Elements in the same group have similar chemical properties.

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8.P.1.2

Which of these elements is most likely to have chemical properties similar to those of calcium (Ca)?

• magnesium (Mg)

• neon (Ne)

• potassium (K)

• Zirconium (Zr)

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8.P.1.2

Which is most likely to conserve energy resources?

• using public transportation

• using nuclear energy instead of solar energy

• turning the thermostats higher in winter

• burning coal instead of using hydropower

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8.P.2.1

Which advantage of using nuclear power plants?

• They use renewable energy resources

• They do not cause air pollution

• They change radioactive substances into harmless substances

• They produce unlimited electrical energy

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8.P.2

8.P.2.2

Which is a possible consequence of using hydropwer to produce electricity?

• Dams may flood areas upstream

• Readioactive wastes may be produced

• Air pollution may increase

• More fossil fuels may be used

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8.P.2.2

About what percentage of Earth's surface is convered with water?

• 30 percent

• 50 percent

• 70 percent

• 90 percent

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8.E.1.1

Which organism is most likely to be found near the surface of the open ocean?

• whale

• clam

• crab

• snail

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8.L.3

What is the relationship between water temperature and dissolved oxygen?

• As water temperature goes up, the amount of dissolved oxygen increases

• Water temperature has no effect on the amount of dissolved oxygen

• The amount of dissovled oxygen decrease as water temperature decreases

• Cold can contain more dissolved oxygen than warm water can.

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8.E.1.3

Which is a biological indicator of water quality?

• diversity of insect larvae

• trubidity

• pH level

• salinity

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8.E.1.3