AnswersLAUSD-Chemistry in the Earth System BCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which statement accurately describes part of the dissolving process of a polar solute in water?

A
Solute molecules repel water molecules.
B
Water molecules surround solute molecules.
C
Water molecules are strongly attracted to nonpolar substances.
D
Solute molecules remain concentrated in one part of the solvent.
22
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Which best explains how scientists confirmed that the moon formed around the same time as Earth?

A
Scientists determined the approximate age of fossils from the moon and Earth.
B
Scientists used radioactive dating to study the age of material from the moon and Earth.
C
Scientists explored the cycle of condensation and evaporation over time on the moon and Earth.
D
Scientists analyzed the content of gases that were part of the atmospheres on the moon and Earth.
23

Which answer gives both a positive impact and a negative impact associated with the effects of nitrogen- and phosphorus-enhanced fertilizers?

A
increased algal blooms and damage to drinking water
B
increased plant growth and damage to drinking water
C
increase in denitrifying bacteria and increase in plant growth
D
increase in a limiting resource and increase in denitrifying bacteria
24

Which factor influences both solubility and the rate of dissolution?

A
pressure
B
temperature
C
particle size
D
nature of solvent
25

What is the relationship between a mole and Avogadro’s number?

A
A mole is the mass of Avogadro’s number of particles of a substance.
B
A mole is the amount of a compound that has Avogadro’s number of carbon-12 atoms in it.
C
A mole contains Avogadro’s number of particles of a substance.
D
A mole is the amount of any substance that has the same mass as Avogadro’s number of carbon-12 atoms.

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