1. Simplest form of matter

2. Distinct chemical and physical properties

3. Cannot be broken down chemically into simpler, stable substances

Elemet

The smallest amount of an element that still has the characteristics of that element

Atom

Pure Substances

Elements and compunds

Mixture

Two or more substances that are physically combined

Mixtures:

Not chemically bonded

Can be separated by physical means

do not have definite competitions

Heterogeneous mixture

Substance not uniformly mixed

Homogeneous mixture

Has Uniform Composition

(uniformly mixed)

Describe a substance without changing composition

Physical Properties

Characteristic chemical reactions that chemical undergoes (changes competition)

Chemical Properties

Extensive Properties depend on:

The amount of a substance

Ex. Mass, Volume

The same regardless of mass

Ex. Density, Color, melting point

Intensive Properties

Constant and typically different from the properties of elements that compose them

Ex. Sodium, reactive t water, Sodium Chloride not reactive

Properties of Compounds

Similar to the properties of compounds of the mixture and changes based of amount of compounds

Properties of mixtures

Physical change

When the composition of a substance is not altered

Chemical change

Reactions rearrange chemical composition to form products

Refers to the identity of form of quality of a substance

Qualitative Data

Quantitative Data

Determines the amount of the substance (quantity)

Precision

Closeness of all of a set of measurements to one another

Accuracy

Closeness of average of a set of mesurments to the true value