1Write the difference between metal and non-metal.
2Write the difference between copper and sulphur.
3Write the names of any two non-metals that are used even as medicine, and their further uses.
4Give the reason: iodine is mixed into common salt.
5Give the reason: the handle of a pressure cooker is covered with a shell of hard plastic.
6Give the reason: a flame of fire is seen at night in places where sulphur is found.
7Iodine sublimes. What does that mean, and is it a physical or a chemical change?
8Write the physical properties and uses of sulphur.
9Cutting an onion makes your eyes water. What has that to do with this topic?
10The table says non-metals do not conduct, yet a pencil lead lights a bulb. Explain.