Give four examples of radioactive substances? [2 MARKS]
Names: 2 Marks Uranium, thorium, radium and polonium.
Give four examples of natural fibres. [2 MARKS]
Give four examples for endocrine glands. [2 MARKS]
Give examples of substances which burn to give a flame. Why do some substances burn without a flame? [3 MARKS]
Give examples of substances which do not burn. Why do they not burn? [3 MARKS]
a) What are salts? How are they formed from acids and bases? Are they acidic, basic or neutral? Give examples. [3 MARKS] b) Give names of the acids found in the following substances: i) Vinegar ii) Curd. [2 MARKS]