Water, pH GRADE A Q&A
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom
by
A) hydrogen bonds.
B) nonpolar covalent bonds.
C) polar covalent bonds.
D) ionic bonds.
E) van der Waals interactions. - (correct answer)C
Which of the following effects is produced by the high surface tension of water?
A) Lakes don't freeze solid in winter, despite low temperatures.
B) A water strider can walk across the surface of a small pond.
C) Organisms resist temperature changes, although they give off heat due to chemical
reactions.
D) Evaporation of sweat from the skin helps to keep people from overheating.
E) Water flows upward from the roots to the leaves in plants. - (correct answer)B
Water molecules are able to form hydrogen bonds with
A) compounds that have polar covalent bonds.
B) oils.
C) oxygen gas (O₂) molecules.
D) chloride ions.
E) any compound that is not soluble in water. - (correct answer)A
, A dietary Calorie equals 1 kilocalorie. Which of the following statements correctly
defines 1 kilocalorie?
A) 1,000 calories, or the amount of heat required to raise the temperature of 1 g of
water by 1,000°C
B) 100 calories, or the amount of heat required to raise the temperature of 100 g of
water by 1°C
C) 10,000 calories, or the amount of heat required to raise the temperature of 1 kg of
water by 1°F
D) 1,000 calories, or the amount of heat required to raise the temperature of 1 kg of
water by 1°C
E) 1,000 calories, or the amount of heat required to raise the temperature of 100 g of
water by 100°C - (correct answer)D
Liquid water's high specific heat is mainly a consequence of the
A) small size of the water molecules.
B) high specific heat of oxygen and hydrogen atoms.
C) absorption and release of heat when hydrogen bonds break and form.
D) fact that water is a poor heat conductor.
E) higher density of liquid water than solid water (ice). - (correct answer)C
Many mammals control their body temperature by sweating. Which property of water is
most directly responsible for the ability of sweat to lower body temperature?
A) the absorption of heat by the breaking of hydrogen bonds
B) waters ability to dissolve molecules in the air
C) the release of heat by the formation of hydrogen bonds
D) waters change in density when it condenses
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom
by
A) hydrogen bonds.
B) nonpolar covalent bonds.
C) polar covalent bonds.
D) ionic bonds.
E) van der Waals interactions. - (correct answer)C
Which of the following effects is produced by the high surface tension of water?
A) Lakes don't freeze solid in winter, despite low temperatures.
B) A water strider can walk across the surface of a small pond.
C) Organisms resist temperature changes, although they give off heat due to chemical
reactions.
D) Evaporation of sweat from the skin helps to keep people from overheating.
E) Water flows upward from the roots to the leaves in plants. - (correct answer)B
Water molecules are able to form hydrogen bonds with
A) compounds that have polar covalent bonds.
B) oils.
C) oxygen gas (O₂) molecules.
D) chloride ions.
E) any compound that is not soluble in water. - (correct answer)A
, A dietary Calorie equals 1 kilocalorie. Which of the following statements correctly
defines 1 kilocalorie?
A) 1,000 calories, or the amount of heat required to raise the temperature of 1 g of
water by 1,000°C
B) 100 calories, or the amount of heat required to raise the temperature of 100 g of
water by 1°C
C) 10,000 calories, or the amount of heat required to raise the temperature of 1 kg of
water by 1°F
D) 1,000 calories, or the amount of heat required to raise the temperature of 1 kg of
water by 1°C
E) 1,000 calories, or the amount of heat required to raise the temperature of 100 g of
water by 100°C - (correct answer)D
Liquid water's high specific heat is mainly a consequence of the
A) small size of the water molecules.
B) high specific heat of oxygen and hydrogen atoms.
C) absorption and release of heat when hydrogen bonds break and form.
D) fact that water is a poor heat conductor.
E) higher density of liquid water than solid water (ice). - (correct answer)C
Many mammals control their body temperature by sweating. Which property of water is
most directly responsible for the ability of sweat to lower body temperature?
A) the absorption of heat by the breaking of hydrogen bonds
B) waters ability to dissolve molecules in the air
C) the release of heat by the formation of hydrogen bonds
D) waters change in density when it condenses
