Sci 8th EOG Release Test #41 - 60

Chlorine has 7 valence electrons.  With what group of elements will chlorine most readily bond?

• group 1

• group 2

• group 16

• group 18

Which is the best example of a chemical change?

• butter melting

• egg cooking

• paper tearing

• water evaporating

Which chemical equation best represents the Law of Conservation of Mass?

• H  +  O  →  H₂O

• H₂  +  O₂  →  H₂O

• 2H₂  +  O₂  →  2H₂O

• H₂  +  O₂  →  2H₂O₂

Which is most likely a major concern associated with burning fossil fuels?

• Burning fossils fuels can pollute the oceans.

• Burning fossils fuels can remove harmful chemicals from precipitation.

• Burning fossils fuels can remove carbon dioxide from the atmosphere.

• Burning fossils fuels can produce smog, which can cause respiratory illnesses.

Which action shows concern for the environment with regards to the resources of the oceans?

• developing technology which will allow for an increases in fish harvesting

• allowing factories to release untreated wastewater into the oceans

• filling in oceanfront wetlands in order to extend beachfront properties

• setting limits on fish harvesting in the oceans

What effect does the water cycle have on the total amount of water on Earth?

• The total amount of waer on Earth is constantly increasing.

• The total amount of water on Earth is constantly decreasing.

• The total amount of water on Earth remains relatively constant.

• The total amount of water on Earth changes due to periods of global warming and cooling.

Which characteristics of water quality provides the most information regarding the health of a water system?

• clarity

• temperature

• concentration of heavy metals

• presence of indicator species

Where is most of Earth's freshwater located?

• in the clouds

• in the ice caps

• in the ocean

• in the ground

Which is the most accurate way of determining the age of a fossil?

• radioactive dating

• relative dating 

• dating index fossils

• dating the rock layers above the fossil

Which allows scientists to investigate what Earth's climate was like over the past 740,000 years?

• volcanic deposits

• fossils

• faults

• ice cores