Q46 of 102 Page 77

The screw driver used by an electrician has a plastic or wooden handle. Why?

Screwdriver is made of metal which is a good conductor of electricity. In order to prevent electric shocks by the screw driver its handle is made of wood. Wood is a poor conductor of electricity which protects from electric shocks and makes the screw driver safe from electric shocks.


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44

Consider the following materials:

Copper, Sulphur, Phosphorus, Carbon (such as: pencil lead), Gold, Silver: Which of these materials are: Malleable and ductile; and brittle.

 45

Can you hold a hot metallic pan which is without a plastic or a wooden handle? Give reason for your answer.

 47

What is the nature (acidic/basic) of the following oxides?

(a) Magnesium oxide


(b) Sulphur dioxide


Given reason for your choice.

 48

What type of oxides are formed:

(a) when metals combine with oxygen?


(b) when non-metals combine with oxygen?