Compounds and Mixtures. Compounds and Mixtures DifferencesMoleculesSeparationPlastics Chemical And...
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Compounds and Mixtures
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Transcript of Compounds and Mixtures. Compounds and Mixtures DifferencesMoleculesSeparationPlastics Chemical And...
Compounds and Mixtures
Elements
A substance that is made up of only one type of atom
Iron Particles – An elementKey:
strong bonds between iron particles
one iron particle
iron particlesheld together by strong bonds
iron particles
iron particles are attracted to a magnet
iron particlesdiagram
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 particlesdiagram
iron particles
sulphur particles
A mixture of iron and sulphur particles
strong bonds between sulphur particles
strong bonds betweeniron 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
Mixture Compound
Two or more elements mingled together
Elements chemically bonded together
Can be separated Very hard to separate
Same properties as parts
New properties of it’s own
SaltSodium (Na)Explodes in
water
Chlorine (Cl)Poisonous
gas
Sodium Chloride(NaCl)
Table saltIt’s own
properties
Mixture and Compounds
Mixtures – Two or more elements mingled together
Compounds- Two or more elements BONDED together.
Element
Element
Mixture
Com
pou
nd
Compound/Elementmixture
Element
Mixture
Mix
ture
Which is it?
ElementCompoundMixture
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 ColouredDoes not rot or rustNot heavy for it’s strengthGood Insulators of heat and electricityNon-biodegradable still here in
1000000 years Monomers small molecules that can be
joined togetherPolymer 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 madeEasy to reverseExample Melting Ice
Chemical Change
In this type of change a new substance is produced
It is hard to reverseExample Burning of
wood or this from the internet
Make a table
Event Chemical Physical
Ice Melting
Wood Burning
..\..\Neil Work\reversible_p1_1.gif
reactants = product
43.43 g Original mass = 43.43 g Final mass
Conservation of 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
SummaryElements 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 175Q 1,2,5,7,8,9
