Chem Review - Matter and Changes

Matter

Stuff of which all materials are made: anything that has mass and takes up space.

Atoms

Extremely small building blocks of matter

Elements

made up of the same atoms, cannot be decomposed to other substances

Molecule

a combination of 2 or more atoms (same or different) that are covalently bonded.

compound

2 or more different elements bonded together in a fixed proportion

Law of Definite Composition

A given compound always contains the same, fixed ratio of elements

Law of Multiple Proportions

Elements can combine in different ratios to form different compounds

Mixtures

two or more substance that are not chemically combined

Heterogeneous mixtures

2 or more phases with different properties

Homogeneous mixtures

uniform properties in a sample and same compositions in a sample

Solution

a homogenous mixture no Tyndall effect (rubbing alcohol)

Suspension

heterogeneous, large particles, has Tyndall effect (orange juice)

Colloid

heterogeneous, medium particles, has Tyndall effect (milk)