Question

6.How is tooth decay reated to P H? How can it be prevented?
7.A white coloured powder is used by doctors for supporting fractured bones.
(i)Write chemical name and formula of the powder.
(ii)When thi white powder is mixed with water a hard solid mass is obtained. Write balanced chemical equation for the change.​

Answer 1

tooth decay start when the pH of the mouth is lower than 5.5 bacteria present in the mouth produce acid by degradation of sugar and food particles remaining in the mouth after eating. this can be prevented by cleaning the mouth and teeth using toothpastes which are generally basic and can neutralize the excess acid.

Answer. A white powder is used by doctors to support fractured bones. A) The name of the white powder is "Plaster of Paris" or simply known as the POP. The chemical formula of POP is,CaSO4.

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