fFeS.gifmulti-word fill quiz 8Ewf4 on "Atoms and elements"
(a doc brown worksheet for QCA KS3 science-chemistry)

Site Meter* Do online OR printout, do, return to check answers. * KS3 Science Index * EMAIL comment?query * Doc Brown's Chemistry updated June 11th 2009 *

   1      2      3      4      5      6      7      chloride      compound      element      equation      formula      iron      magnesium      name      oxide      oxygen      products      reactants      sodium      sulphide      sulphur      word   
molecule8E4.gif 1. Many atoms, especially when heated together, combine with each other to form a .

2. The new substance formed will have its own chemical in words and the ratio of the atoms combined can be shown as a chemical .

3. In general, the chemical change from to can be shown as a equation or as a symbol .

4. sodium + chlorine ==>

5. copper + ==> copper sulphide

6. magnesium + ==> magnesium oxide

7. iron + sulphur ==> iron

8. magnesium + oxygen ==>

molecule8E2.gif 9. Sulphuric acid as the formula H2SO4. This means each molecule contains atom(s) of hydrogen, atom(s) of sulphur and atom(s) of oxygen and there are a total of atoms in the molecule.

10. The formula for an iron oxide is Fe2O3. This means oxygen atoms are combined with 2 atoms and a total of atoms in the formula.

11. The molecule in the picture above on the left is made up of atoms and different elements.