Science PSSA Prep #7

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The diagram below represents two cans of water at the same temperature. One can is painted black and the other can is painted white. The cans are placed on a sunny windowsill, and a thermometer is placed in each can to measure the water temperature.

After four hours in the sunlight, the temperatures of the water in the cans will most likely be...

• the same as when the cans were placed there

• higher, with the same temperature in both cans

• higher in the white can than in the black can

• higher in the black can than in the white can

What is a disadvantage of using moving water to produce electricity?

• Power is produced inexpensively

• Air pollution is produced

• Oil spills may occur.

• The local ecosystems may be disrupted

The diagram below represents a sodium atom bonding to a chlorine atom to form sodium chloride.

Which statement is supported by this diagram?

• Sodium chloride is an element.

• Sodium chloride is a mixture.

• Sodium chloride is a compound.

• Sodium chloride is composed of only one atom.

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• mutation

• genetic engineering

• selective breeding

• natural selection

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• Chemicals applied by farmers lower the level of pollution in drinking water.

• Drinking water can become polluted from unsuspected sources.

• Human activities do not affect groundwater.

• Toxic waste is safe if buried below the level of the basements of nearby homes