Chemistry of Hydrosphere Part 2

The process of a substance changing directly from a solid to a gas is called sublimation.

• True

• False

The changing of ice into water is an exothermic process.

• True

• False

Water and hydrogen fluoride are both nonpolar molecules.

• true

• false

Steam at 100^oC can cause more severe burns than liquid water at 100^oC.

• true

• false

The density of water is independent of temperature.

• true

• false

Liquid A boils at a lower temperature than liquid B.  This indicates that liquid A has a lower vapor pressure than liquid B at any temperature.

• true

• false

Water boils at a higher temperature in the mountains than at sea level.

• true

• false

The normal boiling point temperature of water is 273^oC.

• true

• false

Distillation is effective for softening water because the minerals boil away, leaving soft water behind.

• true

• false

The source of mercury -contaminated fish is industrial pollution.

• true

• false