Water Properties and Polarity

Which is a cause of polarity in water molecules?

• partial negative charge on the hydrogen atoms

• partial positive charge on the oxygen atom

• high electronegativity difference between oxygen and hydrogen

• low electronegativity difference between oxygen and hydrogen

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

• They are more attracted by the oxygen atom than by the hydrogen atom.

• They are more attracted by the hydrogen atom than by the oxygen atom.

• They are equally attracted by the hydrogen and oxygen atoms.

• They are equally repelled by the hydrogen and oxygen atoms.

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

• It would contain ionic bonds.

• It would have improved special properties.

• It would easily bond with other water molecules.

• It would be a nonpolar molecule.

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Water molecules are polar because the

• water molecule has a linear shape.

• water molecule has a bent shape.

• oxygen atom has fewer electrons around it.

• hydrogen atom forms an ionic bond with oxygen.

Which is a characteristic of the polar water molecule?

• a tetrahedral electron domain geometry with covalently bonded atoms

• a tetrahedral electron domain geometry with ionically bonded atoms

• a linear shape with polar covalent bonds

• a linear shape with polar ionic bonds

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

• Strong adhesive forces exist between different water molecules.

• Strong cohesive forces exist between different water molecules.

• Strong adhesive forces exist between glass and the water molecules.

• Strong cohesive forces exist between glass and the water molecules.

Which best the high surface tension of water?

• its high density

• its ion-dipole interactions

• its adhesive interactions

• its hydrogen bonding interactions

Which best explains why water has a high specific heat?

• Hydrogen bonds decrease the amount of energy that is required for the temperature to change.

• Hydrogen bonds increase the amount of energy that is required for the temperature to change.

• Ion-dipole interactions increase the amount of energy that is required for the temperature to change.

• Ion-dipole interactions decrease the amount of energy that is required for the temperature to change.

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

• a jogger sweating after a run

• a fish passing water over its gills

• a deer taking a drink from a stream

• a leaf using water for photosynthesis

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Which best explains why an iceberg floats?

• Water expands and becomes denser when it freezes.

• Water contracts and becomes denser when it freezes.

• Water expands and becomes less dense when it freezes.

• Water contracts and becomes less dense when it freezes.