Compounds and Mixtures

Compounds and Mixtures DifferencesMoleculesSeparationPlastics Chemical And Physical Changes

Elements A substance that is made up of only one type of atom

Iron Particles – An element Key: strong bonds between iron particles one iron particle iron particles held together by strong bonds

iron particles iron particles are attracted to a magnet iron particles diagram

Sulphur particles - Molecule Key: strong bonds between sulphur particles one sulphur particle sulphur particles held together by strong bonds

sulphur particles sulphur particles are not attracted to a magnet sulphur particles diagram

iron particles sulphur particles

A mixture of iron and sulphur particles strong bonds between sulphur particles strong bonds between iron particles

A mixture of iron and sulphur particles A magnet attracts the iron particles but not the sulphur particles. The mixture is separated mixture diagram

To form a compound we heat the mixture Heat

one sulphur particle one iron particle strong bonds between iron and sulphur particles A compound between iron and sulphur particles

A chemical change means a new substance is made A compound between iron and sulphur particles The magnet cannot separate iron and sulphur particles in a compound

Mixtures and Compounds MixtureCompound Two or more elements mingled together Elements chemically bonded together Can be separatedVery hard to separate Same properties as parts New properties of it’s own

Salt Sodium (Na) Explodes in water Chlorine (Cl) Poisonous gas Sodium Chloride(NaCl) Table salt It’s own properties

Mixture and Compounds Mixtures – Two or more elements mingled together Compounds- Two or more elements BONDED together. Element Mixture Compound Compound/ Element mixture Element Mixture

Which is it? Element Compound Mixture

Molecules Two or more atoms BONDED together

Plastics Literally means easy to change shape. Water proof and easy to shape. Mostly made out of oil. The poly in their names means POLYMER.

Properties of Plastics Easily Moulded and Coloured Does not rot or rust Not heavy for it’s strength Good Insulators of heat and electricity Non-biodegradable still here in years Monomers small molecules that can be joined together Polymer is a large molecule made of a chain of smaller molecules

Monomers small molecules that can be joined together. Polymer is a large molecule made of a chain of smaller molecules

Physical Change Nothing new made Easy to reverse Example Melting Ice

Chemical Change In this type of change a new substance is produced It is hard to reverse Example Burning of wood or this from the internetthis from the internet

Make a table EventChemicalPhysical Ice Melting  Wood Burning 

..\..\Neil Work\reversible_p1_1.gif

reactants = product g Original mass = g Final mass Conservation of Mass

In a reaction no new mass is made

Elements A substance that is made up of only one type of atom

Compounds and Mixtures Differences Compounds Joined together Molecules Separation Compounds Hard to separate Plastics Monomers And polymers Chemical And Physical Changes

Summary Elements are…made up of one atom Compounds are made up of 2 or more elements bonded together (they have their own properties) A physical change is reversible and nothing new is made Plastics are made of long chains of monomers and are made of oil. Mass is conserved in all reactions

H/W P 175 Q 1,2,5,7,8,9