Elements, Compounds, and Mixtures 3 KINDS OF MATTER Elements Compounds Mixtures.
Elements, compounds & mixtures
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Transcript of Elements, compounds & mixtures
D. Crowley, 2007
To understand the difference between an element, a compound and a mixture
Look at the pictures below - is it an element or a compound?
Element CompoundElement Element Compound
How about this - element or compound?
Actually this is neither an element or a compound - it is a mixture!
How can we describe a mixture?
Remember: an element is made up of just one type of atom
A compound is two or more elements which are chemically bound together…
A mixture is made from different substances which are not chemically bound
Imagine coloured sweets which can be mixed together in a packet, but are not chemically joined together
Mixture Element 1 Element 2 Element 3 Element 4
You could easily separate these into their different colours - without needing a chemical reaction…
A mixture is made from different substances, which are not chemically bound
E.g. air is a mixture of gases
The gases (oxygen; nitrogen; argon; and carbon dioxide) can be easily separated
The properties of the mixture are just a mixture of the properties of the separate parts!!!
Remember, in a compound a chemical reaction binds the substances together.
This means the properties of the newly formed compound are different from the original elements
In a mixture no chemical reaction occursSo the properties of the mixture is a
mixture of all the properties that make the mixture up!
E.g. a mixture of iron powder and sulphur powder will show properties of both iron and sulphur!
This means our mixture will contain grey magnetic bits of iron + yellow bits of sulphur
Look at the following - copy down the particle boxes, and decide if it represents an element, compound or mixture
Element CompoundElement Mixture Mixture
An element contains just one type of atom
A compound contains two or more types of atoms that are chemically bound
A mixture contains two or more different substances, that are not chemically bound
The different substances in a mixture can be elements or compounds
Copy out the table, given a description of the diagram (e.g. pure element, mixture of elements, compound etc…)
Add an example to your description
Diagram Description Example
Pure element
Pure compound
Mixture of elements
Mixture of compounds
Mixture of elements & compounds
Oxygen
Carbon dioxide
Oxygen & Helium
Alcohol & Water
Air
Try the online quiz: -
http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_test.shtml