Crime Leads to Poverty

Topics: Oxygen, Carbon dioxide, Sodium chloride Pages: 4 (486 words) Published: February 25, 2013

ENKA SCHOOLS
2006-2007 ACADEMIC YEAR
IB CHEMISTRY
WORKSHEET 7a
Classification of Matter

Name _____________________________Class ____________

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] |

1For 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.

|Substance...
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