2006-2007 ACADEMIC YEAR
Classification of Matter
A chemical formula tells you the name and number of atoms in a compound. The smallest particle of many compounds is called a molecule. Molecules are made up of atoms. Some elements are also made of molecules. For example, a molecule of oxygen contains two oxygen atoms joined together. The formula is O2.
|Elements |Compounds |Mixtures | |atoms of helium (He) |molecules of carbon dioxide (CO2) |a mixture of helium and oxygen | |[pic] |[pic] |[pic] | |molecules of oxygen (O2) |molecules of water (H2O) |a mixture of carbon dioxide | |[pic] |[pic] |and oxygen | | | |[pic] | |a lump of carbon (C) |a lump of sodium chloride (NaCl) |a lump of bronze | |[pic] |[pic] |(an alloy of copper and tin) | | | |[pic] |
For each of the following substances, write down whether they are elements, mixtures or compounds. Write your answer in the box.
The first one has been done for you as an example.
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