Multi-word fill quiz Q4 on "Elements and the Periodic Table" © Doc Brown's KS3 chemistry

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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.