Unit 3 - Matter and Energy

Heterogenous mixtures

You can see separate phases or reigons of the mixtures (like rasins in a cookie)

Homogeneous mixtures

You cannot see the individual parts (like salt in water) in the solution.

Pure Substances 1

Have a fixed composition

Pure substances 2

Can’t be broken down by physical means

Mixtures

Can be separated by physical methods like filtration

Compounds

Consist of two or more elements chemically bonded in a fixed ratio

Elements

Consist of one type of atom

Physical Changes

Characteristics we can observe without changing the substance’s identity

Potential energy

Energy based on the position or chemical composition of an object

Chemical Changes

A substance’s ability to transform into a completely new substance

The amount of heat required to change the temperature of exactly 1g of a substance by exactly 1 degree Celsius

Specific heat

The faster the atoms or molecules move, the higher the (BLANK) of a substance

Thermal heat