Chapter 2 - Chemical Bonds

Proteins consist of which elements?

• carbon

• hydrogen

• oxygen

• nitrogen

• phosphorus

Lipids consist of which elements?

• carbon

• hydrogen

• oxygen

• nitrogen

• phosphorus

Which of the following are examples of lipids?

• steriods

• phospholipids

• waxes

• fats

Which of the following are compounds?

• H2O, O2, and CH4

• H2O and O2

• O2 and CH4

• H2O and CH4, but not O2

When a substance dissolves another substance it is a _______. For example, water can dissolve sugar.

• solvent

• solute

Which property of water is described: Water requires a large amount of heat energy to be converted from liquid to gas?

• high heat capacity

• high heat of vaporization

• less dense as a solid

• universal solvent

We can represent atoms by listing the number of protons, neutrons, and electrons—for example, 2p+, 2n0, 2e- for helium. Which of the following represents the 18O isotope of oxygen?

• 7p+, 2n0, 9e-

• 8p+, 10n0, 8e-

• 9p+, 9n0, 9e-

• 10p+, 8n0, 9e-

Which of the following factors will increase the rate of reaction in the forward direction?

• addition of nitrogen

• addition of ammonia

• addition of hydrogen

• addition of both nitrogen and hydrogen

Which of the following is NOT a macromolecule?

• carbohydrates

• lipids

• nucleic acids

• proteins

• mineral salt

A salamander relies on hydrogen bonding to stick to various surfaces. Therefore, a salamander would have the greatest difficulty clinging to a ________.

• slightly damp surface

• surface of hydrocarbons

• surface of mostly carbon-oxygen bonds

• surface of mostly carbon-nitrogen bonds