1Of a copper jug, iron rods, a pressure cooker, coins, gold ornaments, a plastic bucket and a china cup, which are made of metals and which of non-metals?
2What types of materials are used to make these objects?
3What are the similarities and differences in what these objects are made of?
4From where and how are the raw materials needed to make these objects obtained?
5What are minerals? Write their characteristics.
6Why are gold and silver found in the free state while sodium and iron are found as compounds?
7Distinguish between pure and impure substances, with examples.
8What are metalloids? Give two examples.
9Name the groups of minerals found in the Earth's crust. Which group is the most abundant?
10Name four minerals found in Nepal and four places where minerals are found.
11Why are minerals called the sources of metals?