College Chemistry

Law of Conservation of Mass

Heterogeneous

A mixture that isn’t evenly combined EX: crunchy peanut butter

Homogeneos

A mixture that has a uniform structure throughout. EX: creamy peanut butter

Non-polar

Polar

Adding and subtracting significant figures

Measure to the decimal point of the largest significant figure.

Multiplying and Dividing significant figures

The answer must have the same number of significant figures as the number with the least significant figures.

Dimers

Identical molecules. EX: N₂, O₂

Allotropes

An addition to building blocks. EX: O O₂ O₃

Types of Pure Substances

Elements and Compounds

Element

Contains 1 TYPE of atom (B_7, or O₂)

Types of Mixtures

Homogeneous and Heterogeneous

Compound

A substance made of 2+ different atoms, joined by chemical bonds. EX: H2O or NaCl

Mixture

A combination of 2+ substances that are not chemically combined

What is the relationship between the mass of a compound and number of electrons?

molar mass = 6.02×10²³

What is the relationship between the mass of an element and the number of atoms of that element?

Atomic Mass = 6.02×10²³

STP

2.44 LTR