Chapter 2 Part 1

Question 0

Acid Precipitation

Answer 0

Rain, snow, or fog with a pH below 5.6

Question 1

Acid

Answer 1

A substance that increases the hydrogen ion concentration in a solution

Question 2

Adhesion

Answer 2

Attraction between different kinds of molecules

Question 3

Aqueous Solution

Answer 3

A solution in which water is solvent

Question 4

Atom

Answer 4

Smallest unit of matter that stills retains the properties of the element

Question 5

Atomic Mass

Answer 5

Approximate total mass of an item; a whole number, approximately equals the mass number. Also know as the atomic weight

Question 6

Atomic number

Answer 6

The # of portions in each atom of a particular element

Question 7

Base

Answer 7

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

Question 8

Buffer

Answer 8

Chemical substance that resists changes in pH by accepting hydrogen ions from or donating hydrogen ions to solution

Question 9

Chemical bond

Answer 9

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

Question 10

Chemical reaction

Answer 10

Making and breaking of chemical bonds, leading to the changes in the composition of matter

Question 11

Cohesion

Answer 11

Binding together of like molecules, often by hydrogen bonds

Question 12

Compound

Answer 12

Substance that contains two or more elements in a fixed ratio

Question 13

Covalent bonds

Answer 13

Attraction between atoms that share one or more pairs of outer shell electrons; symbolized by a line between the atoms

Question 14

Electrons

Answer 14

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

Question 15

Electron shell

Answer 15

Energy level representing the distance of an electron from the nucleus of an atom

Question 16

Electronegativity

Answer 16

Attraction of a given atom for the electron from the nucleus of another atom

Question 17

Element

Answer 17

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

Question 18

Heat

Answer 18

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

Question 19

Hydrogen bond

Answer 19

Type of weak chemical bond formed when the partially positive hydrogen bond participating in a polar covalent bond in another molecule (or in another part of the same macromolecule)