1.  Complete the sentences:.

      a   An element is  different types of atoms joined together different substances which are not joined together one type of atom only

      b   A compound is different types of atoms joined together different substances which are not joined together one type of atom only

       c   A mixture is different types of atoms joined together different substances which are not joined together one type of atom only

2.  Choose the correct label for each of the pictures:

element mixture compound	element mixture compound	element mixture compound

3.  Say whether each substance is an element, compound or mixture in this table:

4.   Water has the formula H₂0 and oxygen is 0₂. In question 2 which picture is oxygen A B C

      and which is water. A B C .  Explain your answer

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