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Elements, Compounds & Mixtures
D. Crowley, 2007
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Elements, Compounds & Mixtures
To understand the difference between an element, a compound and a mixture
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Element or compound? Look at the pictures below - is it an element or a compound? Element Element Compound Element Compound
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Element or compound? How about this - element or compound?
Actually this is neither an element or a compound - it is a mixture!
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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
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Sweets Imagine M&M’s which can be mixed together in a packet, but are not chemically joined together You could easily separate these into their different colors - without needing a chemical reaction… Mixture Element 1 Element 2 Element 3 Element 4
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Definition 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!!!
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Properties 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 occurs So the properties of the mixture is a mixture of all the properties that make the mixture up!
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Mixture Example 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
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Examples Look at the following - copy down the particle boxes, and decide if it represents an element, compound or mixture Element Element Compound Mixture Mixture
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Summary 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
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Mixture of elements & compounds
Summary 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 Oxygen Pure compound Carbon dioxide Mixture of elements Oxygen & Helium Mixture of compounds Alcohol & Water Mixture of elements & compounds Air
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White board activity https://prezi
Take the whiteboard from underneath your desk and place it on top of your desk. You will be working with at least one other person. You need to discuss the question before writing the answer. Do not raise your whiteboards until I ask you to
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Distinguishing between Elements, Compounds, and Mixtures
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compound
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Mixture of elements
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Mixture of elements
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element
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compound
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compound
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Mixture of elements & compounds
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Distributed Summarizing
The diagram below shows how two elements can be mixed together…Which is a Compound? A Mixture? A. B. C. D. Compound Mixture
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Match the Picture to the Description
Compound of 2 Elements Mixture of elements Element Molecule Compound of 3 Elements element Mixture of elelments
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