AnswersEO Chemistry 7320BUnit Test

Properties of Water Answers

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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
2
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Which example best shows that the chemistry of water is helpful to plants?

A
Water’s polarity produces a high density, which allows water to move to the leaves.
B
Water’s bent shape causes a slow passage of nutrients up to the leaves of plants.
C
Water’s polarity causes cohesion that pulls other water molecules up through a plant.
D
Water’s bent shape reduces its own passage through the cell membranes of roots.
3

Which best explains why an iceberg floats?

A
Water expands and becomes denser when it freezes.
B
Water contracts and becomes denser when it freezes.
C
Water expands and becomes less dense when it freezes.
D
Water contracts and becomes less dense when it freezes.
4

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.
5

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.
6

Which best explains why water has a high specific heat?

A
Hydrogen bonds decrease the amount of energy that is required for the temperature to change.
B
Hydrogen bonds increase the amount of energy that is required for the temperature to change.
C
Ion-dipole interactions increase the amount of energy that is required for the temperature to change.
D
Ion-dipole interactions decrease the amount of energy that is required for the temperature to change.
7

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
8

Which statement would be true about a water molecule if it had a linear shape?

A
It would contain ionic bonds.
B
It would have improved special properties.
C
It would easily bond with other water molecules.
D
It would be a nonpolar molecule.
9

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.
10

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.
11

Water molecules are polar because the

A
water molecule has a linear shape.
B
water molecule has a bent shape.
C
oxygen atom has fewer electrons around it.
D
hydrogen atom forms an ionic bond with oxygen.
12

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.
13

Which role of water is significant for most living things in a biological system?

A
It prevents many life processes from occurring.
B
It slows down the transportation of nutrients.
C
It provides temperature regulation.
D
It does not freeze in cells at very cold temperatures.
14

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
15

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

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