Unit 1 - Chemistry of Life Review

In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by

• hydrogen bonds.

• nonpolar covalent bonds

• polar covalent bonds.

• ionic bonds.

• van der Waals interactions

The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule. What is this attraction called?

• a covalent bond

• a hydrogen bond

• an ionic bond

• a hydrophilic bond

• a hydrophobic bond

What gives rise to the cohesiveness of water molecules?

• hydrophobic interactions

• nonpolar covalent bonds

• ionic bonds

• hydrogen bonds

• both A and 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?

• water's change in density when it condenses

• water's ability to dissolve molecules in the air

• the release of heat by the formation of hydrogen bonds

• the absorption of heat by the breaking of hydrogen bonds

• water's high surface tension

Why does ice float in liquid water?

• The liquid water molecules have more kinetic energy and thus support the ice.

• The ionic bonds between the molecules in ice prevent the ice from sinking.

• Ice always has air bubbles that keep it afloat.

• Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water

• The crystalline lattice of ice causes it to be denser than liquid water

Water's high specific heat is mainly a consequence of the

• small size of the water molecules.

• high specific heat of oxygen and hydrogen atoms.

• absorption and release of heat when hydrogen bonds break and form.

• fact that water is a poor heat conductor.

• inability of water to dissipate heat into dry air.

Differentiate between cohesion, adhesion, and surface tension.

Which part of the diagram is showing a monomer?

• A

• B

• C

• D

Which part of the diagram shows a condensation reaction?

• A

• B

• C

• D

Which type of water property explains water's ability to stick to other material.

• Cohesion

• Surface tension

• Adhesion

• High specific heat