Ch.2 Chemistry of Life REVIEW

What is the relationship between the number of protons and electrons in a neutral atom?

• There are twice as many protons as electrons.

• There are an equal number of protons and electrons.

• There are twice as many electrons as protons.

• When added together, the number of protons and electrons equals the number of neutrons.

A ____ is formed when two atoms share one or more pairs of electrons.

• ionic bond

• polar bond

• covalent bond

• hydrogen bond

When a solution has more hydrogen ions(H+) than hydroxide ions(OH-), it is considered ____.

• ionized

• basic

• acidic

• neutral

Match each monomer, example, and function to the 4 biomacromolecules

Groups:

(a) Carbohydrates

,

(b) Lipids

,

(c) Nucleic Acids

,

(d) Proteins

• examples= enzymes

• Monomer= monosaccharides

• monomer= amino acids

• stores a moderate amount of energy

• used for muscle contraction, tendons/ligaments, and antibodies

• contains hereditary information

• long term,high energy storage

• examples= DNA and RNA

• monomer= nucleotides

• examples=sugrs

• monomer= NONE

• examples= fats,oils, waxes

The most basic unit of an element is:

• proton

• neutron

• electron

• atom

Match the terms correctly

• [location for protons and neutrons

• electron

• negative

• proton

• positive

• electron cloud

• no charge

• neutron

• location for electrons

• nucleus

Which of the following atoms is a negatively charged ion?

• An atom that becomes stable by gaining an electron

• A noble gas

• An atom that is stable without gaining or losing electrons

• An atom that becomes stable by losing an electron

An ionic bond is most likely to form between: (select all that apply)

• two positively charged ions.

• a metal and a non-metal

• two negatively charged ions.

• a negatively and a positively charged ion.

Atoms are the smallest unit of an element that retains its characteristic properties.

• True

• False

Typically, nitrogen atoms are composed of seven electrons, seven protons, and seven neutrons. An isotope of nitrogen could

• have more than seven electrons and more than seven protons

• be negatively charged

• have more than seven neutrons

• have more than seven protons