biochem - 1

Weak interactions in an aqueous environment include:

• Covalent bonds

• Ionic bonds

• Hydrogen bonds

• Metallic bonds

Which of the following is NOT a property of water?

• A) Exists in more than one state

• B) Low boiling point

• C) Acts as a universal solvent

• D) Forms H-bonds with polar solutes

Electronegativity measures an atom’s ability to attract what?

• electrons

• protons

• neutrons

• photons

True or False: Nonpolar gases are poorly soluble in water.

• True

• False

Hydrogen has a relatively high electronegativity because:

• it has a small atomic size and a high effective nuclear charge.

• it has a large atomic size and a low effective nuclear charge.

• it has a small atomic size and a low effective nuclear charge.

• it has a large atomic size and a high effective nuclear charge.

What is the bond angle in a water molecule?

• The bond angle in a water molecule is approximately 104.5 degrees.

• The bond angle in a water molecule is approximately 90 degrees.

• The bond angle in a water molecule is approximately 120 degrees.

• The bond angle in a water molecule is approximately 180 degrees.

How many other molecules does each water molecule form hydrogen bonds with in liquid water?

• Each water molecule forms hydrogen bonds with approximately 4 other water molecules in liquid water.

• Each water molecule forms hydrogen bonds with approximately 2 other water molecules in liquid water.

• Each water molecule forms hydrogen bonds with approximately 6 other water molecules in liquid water.

• Each water molecule forms hydrogen bonds with approximately 1 other water molecule in liquid water.

What type of compounds dissolve easily in water?

• Ionic compounds

• Covalent compounds

• Metallic compounds

• Non-polar compounds

What property allows a paper clip to float on water?

• Adhesion

• Cohesion

• Surface tension

• Viscosity

Fill in the blank: Soap molecules combine to form a _______.

• micelle

• emulsion

• colloid

• suspension