science testttt

Chemical property

Characteristic of a pure substance that describes its ability to change into another substance

Physical property

Characteristic of a pure substance that can be observed without changing it into another substance

Atom

Basic particle from which all elements are made

Element

Pure substance that cannot be broken into simpler substances

Compound

Pure substance that is made up of 2+ elements chemically combined in a set ratio

Homogenous mixture

Evenly mixed so you can’t see the different parts of the mixture

Heterogenous mixture

Can see the different parts of the mixture

Molecule

Group of 2+ atoms held together by chemical bonds

Law of Conservation of Mass

Matter cannot be created or destroyed, only transformed

Chemical change

When matter undergoes a change that results in new substances (ex. Burning, rust)

Physical change

When matter undergoes a change but it is still the same substance (ex. Breaking, cutting, boiling)

Chemical or physical change: cutting a tree down

Physical

Chemical or physical change: a car rusting on the side of the road

Chemical

Chemical or physical change: dissolving salt in water

Physical

Chemical or physical change: burning a marshmallow

Chemical

Chemical or physical change: freezing a popsicle

Physical

Chemical or physical change: drying wet clothes in the sun

Physical

What temp does water freeze at?

0 degrees Celsius

Ice melts at what temp?

0 degrees C

Water boils at what temp?

100˚C

Amorphous solid

Does/doesnt melt at a specific temp

Randomly organized particles, not a crystalline structure

Doesn’t

Crystalline solid

Does/doesn’t melt at a specific temp

Particles organized in a clear pattern

Does

Surface tension

Property of liquid whose particles pull together (ex. Water bugs on surface)

Viscosity

How fluid a liquid is; how much it sticks (ex. Honey has viscosity)

Gas —> liquid

Condensation

Liquid —> gas

Evaporation

Liquid —> solid

Freezing

Solid —> liquid

Melting

Gas —> solid

Deposition

Solid —> gas

Sublimation