Chapter 2 Pt 1 Flashcards Preview

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Flashcards in Chapter 2 Pt 1 Deck (20):
1

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

Acid

2

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

Acid Precipitation

3

The attraction between different kinds of molecules

Adhesion

4

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

Atom

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

Atomic mass

6

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

Atomic Number

7

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

Base

8

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

Buffer

9

A solution in which water is the solvent.

Aqueos Solution

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.

Chemical Bond

11

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

Chemical reaction

12

The binding together of like molecules, often by hydrogen bonds

Cohesion

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).

Compound

14

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

Covalent Bond

15

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

Electron

16

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

Electron Shell

17

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

Electronegativity

18

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

Element

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.

Heat

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).

Hydrogen Bond