ALL ABOUT SUBSTANCES

1. MATTER- living and non-living things
2. Non-living things: pure and mixtures.
3. Pure: elements and compounds; 
4. Elements: metals ,gold,silver copper aluminium
5. Non-metals: oxygen hydrogen,carbon
6. Metalloids:

   NUMBER	SYMBOL	ELEMENT
   5	B	Boron
   14	Si	Silicon
   32	Ge	Germanium
   33	As	Arsenic
   51	Sb	Antimony
   52	Te	Tellurium
   84	Po	Polonium

7. Inert gases: helium,neon, argon
8.  Mixtures: Homogeneous, Heterogeneous
9. Substance:Pure: made up of only one kind of molecule
10. Mixtures: Combination of two or more elements separated out by physical techniques -filteration
11. compounds-formed from two or more elements chemically united  in fixed proportion-water -H2O
12. Metal: elements,malleable, ductile,sonorous -good conductors of heat and electricity.Iron
13.  Alloys: Homogeneous mixtures of two or more metals or non-metals to improve properties- steel-iron + carbon.
14. Components distributed evenly-Homogeneous mixture- salt solution
15. Two or more unevenly mixed components- Heterogeneous mixtures- sand and water, sandwich
16.  Simple substance made up of only one kind of atoms-cannot be broken down into simpler substances by chemical methods.ELEMENTS.
17.