Chemistry Unit 1

Chemistry

The study of matter, props, and the change it goes through

Matter

Anything that has mass and has volume

Mass

measures in grams

Volume

measures in mL

Physical Change

A change of matter from 1 form to another without a change in chemical props.

Chemical Change

Turns into an entirely new substances with different properties.

Does the matter’s formula change after a chemical change?

Yes

Physical Props.

quality of substance be measured/observed without changing

Some EX of physical props

color, melting point, boiling point, mass, vol., density, luster, odor

Chemical Props

Substances ability undergo changes transform it into different substances

Some EX of chemical props.

Color change, formation of bubbles, temp. change, release/absorption of E, formation of precipitation (solid)

Mixture

Combination of 2 substances that are NOT chemically bonded (a formula can’t be written for it.)

Pure Substance

A formula can be written for it and is either compound or an element

Homogeneous Mixture

No visible layers, no settling out of particles (Very common in HS Chem)

Heterogeneous Mixture

Not Uniform throughout

Colloid

containing small particles that are small enough to be suspended

Suspension

Large dispersed particles that can settle out

Solution

A homogeneous mixture of 2 or more substances uniformly dispersed throughout a single phase

Solvent

The component that is in the highest quantity

Solute

The component that is in the lowest quantity

Aqueous sol. (aq.)

homogeneous mixture w/ H2O as the solvent

What is a Pure Substances?

Elements, Molecules, Compounds

Elements

All atoms of the same element have the same atomic #

Molecules

A single particle of 2 atoms or more chemically bonded to each other

Compound

2 or more diff. elements joined by chemical bonds

Diatomic Molecules of Elements

Same element bonded to each other

The 7 elements that are Diatomic

Nitrogen, hydrogen, oxygen, fluorine, Chlorine, bromine, iodine.