Q23 of 252 Page 57

What elements do the following compounds contain?

Sugar, Common salt

Chemical formula of Sugar is C12H22O11. It contains C, H and O Elements Chemical formula of Common salt is sodium chloride, NaCl. It contains Na and Cl elements.


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21

Classify the following into elements and compounds:

(i) H2O (ii) He (iii) Cl2 (iv) CO (v) Co

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Classify the following as elements or compounds:

Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea

 24

What are pure substances? Give two examples of pure substances.

 25

What are the two types of pure substance? Give one example of each type.