8 Eb-1
Oxidation
Name Class Date
1 Hydrogen and oxygen react to form water.
a Colour the oxygen atoms in red. Colour the hydrogen atoms in grey.
a How many hydrogen atoms are there in all the reactants?
b How many hydrogen atoms are there in all the products?
c How many oxygen atoms are there in all the reactants?
d How many oxygen atoms are there in all the products?
e If the masses of oxygen and hydrogen were measured before the reaction, and the mass
of water formed was measured after the reaction, what would we see?
Tick () the correct box.
total mass of hydrogen and oxygen greater than mass of water
total mass of hydrogen and oxygen same as mass of water
total mass of hydrogen and oxygen less than mass of water
2 When a metal reacts with oxygen, the metal oxide is formed. Write down the products of these
reactions.
a magnesium + oxygen
b copper + oxygen
c What is the name of this kind of reaction?
3 Sometimes it seems as if mass has been gained in a reaction.
The zinc has combined with oxygen to form zinc oxide.
Where did the oxygen come from?
I can…
● state what happens to mass in an oxidation reaction
● describe oxidation reactions of metals.
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