College Chemistry Chapter #2 Exam Study

Dalton's Postulates:

Law of Definite Proportions:

States that regardless of the amount, a pure compound always contains the same elements in the same proportions by mass.

Law of Conservation of Matter:

The total mass of materials present after a

chemical reaction is the same as the total

mass present before the reaction.

Charge/mass ratio of the electron:

1.76 x 10 e(8) C/g

Mass Number is equal to:

Protons + Electrons

Isotopes are an element with differing:

(A.) Protons

(B.) Electrons

(C.) Neutrons

(C.) Neutrons

___________ formulas give the exact number of

atoms of each element in a compound.

Molecular

___________ formulas give the lowest whole-number

ratio of atoms of each element in a compound.

Empirical

____________ formulas show the order

in which atoms are bonded.

Structural

Polyatomic ions are

composed of more than one

______.

Atom

In Ionic Compounds, ________ are usually a metal.

Cations

In Ionic Compounds, ________ are usually a non-metal.

Anions