AnswersSTPSB_Environmental Science 2627Properties of Water

Week 10: Properties of Water Answers

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1
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Which statement best explains water’s ability to dissolve covalent compounds?

A
Water can dissolve polar covalent compounds through dipole-dipole interactions.
B
Water can dissolve nonpolar covalent compounds through hydrogen-bonding interactions.
C
Water can dissolve polar covalent compounds through ion-dipole interactions.
D
Water can dissolve nonpolar covalent compounds through dipole-dipole interactions.
2
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Which best explains why blood and the cytoplasm of cells are mainly composed of liquid water?

A
Water is a common substance and is readily available.
B
Water is an important transport and reaction medium.
C
Water prevents biological reactions from occurring readily.
D
Water prevents turgor pressure from making the cells too rigid.
3

Which statement is true about the electrons in each polar bond of a water molecule?

A
They are more attracted by the oxygen atom than by the hydrogen atom.
B
They are more attracted by the hydrogen atom than by the oxygen atom.
C
They are equally attracted by the hydrogen and oxygen atoms.
D
They are equally repelled by the hydrogen and oxygen atoms.
4

Which is a characteristic of the polar water molecule?

A
a tetrahedral electron domain geometry with covalently bonded atoms
B
a tetrahedral electron domain geometry with ionically bonded atoms
C
a linear shape with polar covalent bonds
D
a linear shape with polar ionic bonds
5

Which is the best example of water regulating an organism’s body temperature?

A
a jogger sweating after a run
B
a fish passing water over its gills
C
a deer taking a drink from a stream
D
a leaf using water for photosynthesis
6

Which best explains why water is able to “stick” to the side of glass?

A
Strong adhesive forces exist between different water molecules.
B
Strong cohesive forces exist between different water molecules.
C
Strong adhesive forces exist between glass and the water molecules.
D
Strong cohesive forces exist between glass and the water molecules.
7

Water can resist a greater external force than ethanol can. Which statement best describes this difference?

A
Water has less capillary action than ethanol.
B
Water has greater capillary action than ethanol.
C
Water has lower surface tension than ethanol.
D
Water has greater surface tension than ethanol.
8

Which statement best describes how water’s properties relate to its functions in a human’s biological systems?

A
Water absorbs a lot of energy from the skin due to its high specific heat.
B
Water enters the body and provides support due to capillary action.
C
Water helps decrease the body’s density to allow it to float.
D
Water dissolves and transports nonpolar covalent compounds in the body.
9

Which best explains the high surface tension of water?

A
its high density
B
its ion-dipole interactions
C
its adhesive interactions
D
its hydrogen bonding interactions
10

Which is a cause of polarity in water molecules?

A
partial negative charge on the hydrogen atoms
B
partial positive charge on the oxygen atom
C
high electronegativity difference between oxygen and hydrogen
D
low electronegativity difference between oxygen and hydrogen

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