5.6 Physical & Chemical Changes

Physical and Chemical Physical and Chemical ChangesChanges5.6

Physical ChangesPhysical Changes

Physical change: when matter changes size, shape, or form◦Physical changes can be reversed

◦You know it is a physical change when you can get it back somehow

Freezing and MeltingFreezing and Melting Water can be found as a solid (ice), liquid, and gas

(water vapor) At room temperature, water is a liquid At 32° Fahrenheit (O° Celsius), water freezes and is a

solid◦ Water’s atoms begin to move at a slower rate

32° Fahrenheit (O° Celsius) is also water’s melting point where it becomes a liquid again

EvaporationEvaporationEvaporation: the physical

change of matter from a liquid state to a gaseous state◦Water’s boiling point is 100° C (212°

F)

CondensationCondensationCondensation: the physical

change of matter from a gaseous state to a liquid state◦Ex: fog, dew on grass, glass of ice

water “sweating”

Chemical ChangesChemical ChangesChemical change: a change in

matter that forms a new substance with different properties◦Chemical changes can’t be reversed◦You know it’s a chemical change when

it can’t go backSigns of a chemical change:

◦Gas forms◦Heat is given off or absorbed◦A solid forms or disappears◦Light is produced

BurningBurning Wood is heated to a high

temperature and the heat makes the wood change into a different type of matter

+ =

You can’t change ash back into wood.

““Property Changes” BrainPop Property Changes” BrainPop Video and Physical and Video and Physical and Chemical Changes FoldableChemical Changes Foldable