Chemistry/Physical Properties & Changes Deffintions

Properties

Properties

Properties are characteristics of a substance that we can observe

Physical changes

Occurs when the shape or appearance of a substance changes.

Phase changes are physical properties

There is no chemical reaction

Can be reversed or undone

Chemical changes

A new substance is created during a chemical reaction

Cannot be reversed or undone

Chemical Formula

A code that represents the number of kind of atoms in one particle of a substance

Common Name

The everyday familiar name of a substance

Chemical Name

The name chemists use for a substance, which contains the name of the elements in that substance

Density

Amount of matter in a given volume

It is a physical property

How close together atoms are in a given volume

Density units for liquids

g/mL

Density units for solids

g/cm³

Density formula

Density = mass / volume

Mass formula

Mass = density * volume

Volume formula

Volume = mass / density

Chemical Property

A property that can only be observed after a chemical change has occurred.

5 signs of a chemical change

color change

tempiture change

formation of a solid

oder change

formation of gas

Chemical changes

Flammability

Reactivity

Acidity

Toxicity

Physical properties

Are observed without changing the make up of the substance.

Without a chemical reation

Physical properites example

Melting/boiling/freezing point

Conductivity (the ability of a material to allow heat or electricity to flow though it)

Solubility (a substance ability to dissolve)