Explain why, diamond has a high melting point.

$ \ \ \ \ \ \ \ \ \text{H} \ \ \ \ \ \text{O} \ \ \ \ \ \ \ \ \ \ \ \ \ \text{H} \ \ \ \ \text{H}\\ \ \ \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \text{||} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|}\\\text{H}-\text{C}-\text{C}-\text{O}-\text{C}-\text{C}-\text{H}\\ \ \ \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|}\\ \ \ \ \ \ \ \ \ \text{H} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{H} \ \ \ \ \ \text{H}$

Write the formula of the acid and the alcohol from which it is formed.

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Which chemical is injected into the skin of a person:
During the nettle leaf hair sting?
How can the effect of these stings be neutralised?

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What happens when zinc granules are heated with sodium hydroxide solution?
Write equation of the reaction which takes place.

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Describe two anomalies of Mendeleev’s periodic classification of elements.

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Write any two observations in an activity which may suggest that a chemical reaction has taken place. Give an example in support of your answer.

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Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate? How will you test for the presence of this gas?

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