Chapter 2 Pt 1

Question 1

A substance that increases the hydrogen ion concentration in a solution.

Answer 1

Acid

Question 2

Rain, snow, or fog with a pH below 5.6.

Answer 2

Acid Precipitation

Question 3

The attraction between different kinds of molecules

Answer 3

Adhesion

Question 4

The small unit of matter that retains the properties of an element

Answer 4

Atom

Question 5

The approximate total mass of an item; Given as a whole number, this definition approximately equals the mass number. Also known as the atomic weight

Answer 5

Atomic mass

Question 6

The # of protons in each atom of a particular element.

Answer 6

Atomic Number

Question 7

A substance that decreases the hydrogen ion (H) concentration in a solution

Answer 7

Base

Question 8

A chemical substance that resists changes in pH by accepting hydrogen ions from or donating hydrogen ions to solutions.

Answer 8

Buffer

Question 9

A solution in which water is the solvent.

Answer 9

Aqueos Solution

Question 10

An attraction between two atoms resulting from a sharing of outer-shell electrons or the presence of opposite charges on the atoms. The bonded atoms gain complete outer electron shells.

Answer 10

Chemical Bond

Question 11

The making and breaking of chemical bonds, leading to changes in the composition of matter.

Answer 11

Chemical reaction

Question 12

The binding together of like molecules, often by hydrogen bonds

Answer 12

Cohesion

Question 13

A substance containing two or more elements in a fixed ratio. For example, table salt (NaCl) consists of one atom of the element sodium (Na) for every atom of chlorine (Cl).

Answer 13

Compound

Question 14

An attraction between atoms that share one or more pairs of outer-shell electrons; symbolized by a single line between the atoms

Answer 14

Covalent Bond

Question 15

A subatomic particle with a single negative electrical charge. One or more of this item moves around the nucleus of an atom.

Answer 15

Electron

Question 16

An energy level representing the distance of an electron from the nucleus of an atom.

Answer 16

Electron Shell

Question 17

The attraction of a given atom for the electrons of a covalent bond.

Answer 17

Electronegativity

Question 18

A substance that cannot be broken down to other substances by chemical means.

Answer 18

Element

Question 19

Thermal energy; the amount of energy associated with the movement of the atoms and molecules in a body of matter. This energy in its most random form.

Answer 19

Heat

Question 20

A type of weak chemical bond formed when the partially positive hydrogen atom participating in a polar covalent bond in one molecule is attracted to the partially negative atom participating in a polar covalent bond in another molecule (or in another part of the same macromolecule).

Answer 20

Hydrogen Bond