Q6. Give Reasons (any3) a) Why is it easy to burn a heap of dry grass, compared to green grass? b) Why crude oil extracted from the earth called petroleum? i c)Why do carom coins move faster on the carom board when dusted with talcum powder? d d)Why pickles are not stored in aluminium can?
Answers
Answer:
A. Presence of water tends to increase the ignition temperature. So, the heap of green leaves do not catch fire easily. On the other hand, dry leaves have no water. Their ignition temperature is less and easily attainable.
B.Petroleum is a dark coloured,thick crude oil found deep below the ground in certain areas. The name petroleum means rock oil.It is called petroleum because it is found under the crust of earth trapped in rocks. 1)Petroleum is a complex mixture of compounds which are made up of only two two elements:carbon and hydrogen.
C. talcum powder being a lubricant decreases the friction and so,th4e carromj coins move faster. ... The force of friction is decreased between carom board and coins due to which coins move faster on it.
D.Metals like aluminum readily react with acid to liberate hydrogen gas. This can lead to spoiling of the pickle.
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