15.1 Water and its Properties
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.
