Science-Classifying Materials-Junior Cycle

Matter is split into………..

Pure Substance

Made up of particles that are exactly the same sa each other

Mixture

Made up of tow or more different substances mingled together but are not chemically combined. An object will float if its density is less than the medium

Element

Pure substance which cannot, by chemical means be broken down onto simpler substances

>Smaller number=Atomic number

>Atomic number=number of protons

Compounds

Pure substance made from two or more elements which are chemically combined. Completely new substance with its own properties

Molecules

Smallest part of an element that can exist on it’s own. Elements that make up compounds, always present in definite fixed amounts.

Physical Change

No new substance formed

Chemical change

New substance created

Properties of metals

>Lustrous

>Solid, except for Hg

>Malleable

>Ductile

>Sonorous

>Dense and strong

>High melting points

>Good conductor of heat and electricity

>Most metals corrode

Corrosion of metals

When they react with oxygen in the air. Oxidization, Magnesium + Oxygen = Magnesium oxide

Properties of non metals

>Poor conductor of heat

>Poor conductor of electricity

>Dull

>Have low boiling point