Question

(a) What colour flame will be observed when a magnesium ribbon is burnt in the presence of oxygen? Name the product
formed in this reaction.
(b) State the metal or non-metal used in:
(i) vulcanization of rubber​

Answer 1

Answer:

a Evidence: When magnesium is placed in a Bunsen burner flame in air it burns with a bright, white flame. The product is a white powdery solid. Explanation: At high temperatures the magnesium atoms in the metal combine with the oxygen atoms in the air. A chemical reaction produces magnesium oxide.

b The nonmetal used to treat rubber in the process of vulcanization is sulphur. Natural rubber is soft, sticky and has less tensile strength. Vulcanization makes rubber more strong, tough and elastic. Natural rubber is mixed with 3 to 5 % sulphur and heated at 100 to 150 deg C, which results in cross linking of chains of cis-1,4-polyisoprene through disulphide (−S−S−) bonds

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