Topics from May 2016
- Why can’t ornaments be made with pure gold? What is the purity (in percentage) of 22 carat and 18 carat gold?
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- What is Pasteurization? Is it a process of sterilization?
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- Why do plastics become brittle when exposed to the Sun for a long period?
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- How does soap clean our clothes?
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- Do normal hand soaps actually kill germs? We are always encouraged to wash our hands after a visit to the toilet, but does this really make much difference?
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- Why is zeolite used in the purification of water?
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- Why does continued use of hard water result in the formation of a layer in utensils, water filters and boilers?
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- How does potassium cyanide cause sudden death?
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- What causes cooling when glucose is dissolved in water?
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- What is fire made of? What is its atomic structure? What causes things to burst into flames in the first place and why can't all materials be made to produce flame?
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- Why don’t identical twins have identical fingerprints?
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- Why is the sting of a scorpion more painful than that of a snake sting? What are the chemicals in their poisons?
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- How do trees reduce air pollution?
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- Why do vegetables such as cucumber, snake gourd and bottle gourd sometimes taste bitter?
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- How can we identify poisonous and non-poisonous mushroom?
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- What makes a cola foam up when you put a pretzel in it?
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- Why does boiled water lose taste?
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- Does cold water extinguish fire faster than hot water?
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- Why are soap bubbles and oil layers coloured?
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- How does carbon change into diamond?
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- What does 43 and 53 grade cement mean?
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