EXERCISES

I.            Complete the sentence .

1.  Oxygen is nearly   ( 50, 25, 70 ) per cent of matter composing
the earth.

2. The combining of oxygen with another substance is called (ore ,
     oxidation, reduction)    

3. Sulfur is (red, green, yellow) in color.

4.  Sulfur burns in air to ( CO₂, SO₂, H₂SO₄)

II.        Match the words

        

rust oxygen degree yellow metal active

sulfur iron tarnish element Centigrade oxidation

III.           Give full names of the following compounds:

1.    SO₂ –

2.    CaO –

3.    CaS –

4.    MnS –

5.    FeS –

6.    H₂SO₄ –

7.    FeO -