15.1 Water and its Properties

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Always True

Detergents lower the surface tension of water by interfering with the formation of hydrogen bonds.

Polar

Each O-H bond in a water molecule is highly ____________.

Surfactant

A wetting agent.

Polar

Because the H-O-H bond angle is 105 degrees, the water molecule as a whole is ___________.

Positive

Hydrogen acquires a partial ________ charge.

High

Hydrogen bonding accounts for water's ______________ boiling point.

Surface

Hydrogen bonding is also responsible for the high ______ tension of water.

Never True

Hydrogen bonding is responsible for the polar nature of the water molecule.

Dense

Ice floats in water because it is less ________ than water.

Hydrogen Bonding

Ice has a rigid open structure, which is also due to _____________.

Always True

Ice is less dense than water.

Hydrogen Bond

Intermolecular attraction between a hydrogen atom and a highly electronegative atom such as oxygen, on an adjacent molecule.

Surface Tension

Inward force that tends to minimize the surface area of a liquid.

Spherical

Liquids tend to minimize their surface area and form _________ droplets because of their surface tension.

Negative

Oxygen acquires a partial ________ charge.

Surfactant

The surface tension of water can be reduced by adding a _____________.

Never True

The water molecule is a straight molecule.

Low

This bonding accounts for many properties of water, such as its __________ vapor pressure.

Sometimes True

Water becomes more dense as it is cooled.

Hydrogen

Water molecules are attracted to each other by intermolecular _________ bonds.

Ice

_________ floats in liquid.


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