Answer in short.(Any six) [12]
12. Define thermal decomposition. Also write one example to show it in form of reaction.
13. What is a balanced chemical equation? Why should chemical equations be balanced?
14. What is the function of digestive enzymes?
15. How do we detect the smell of an agarbatti (incense stick) ?
16. Why does menstruation occur?
17. State laws of reflection.
18. What kind of mirror-concave, convex or plain –would be suited for use in a solar cooker?
why?
Answers
Answer:
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Answer:
12.thermal decomposition is a chemical reaction where a single substance breaks down into 2 or more simple substances when heated the reaction is usually endothermic as he at is needed to break the bonds
ex: it is used in the preparation of oxygen
13.Balanced chemical equation: A chemical equation in which the number of each type of atom is equal on the two sides of the equation
Equations must be balanced to accurately reflect the law of conservation of matter
14.Digestive enzymes play a key role in breaking down the food you eat. These proteins speed up chemical reactions that turn nutrients into substances that your digestive tract can absorb. Your saliva has digestive enzymes in it.
15.At first, the smell of the incense stick reaches our nose, then the olfactory receptors present in our nose detect it. Then the receptors send this information to the forebrain in the form of electrical signals. Then the forebrain interprets this information as the smell of incense stick where it is already stored.
16.A period happens because of changes in hormones in the body. ... The ovaries release the female hormones estrogen and progesterone . These hormones cause the lining of the uterus (or womb) to build up. The built-up lining is ready for a fertilized egg to attach to and start developing.
17. 1. The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane. 2. The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given color and for the given pair of media.
18.Concave mirrors are used in solar cookers. This is because they are the only type of mirrors that reflect sunlight to a single focal point. If you use a convex mirror for your cooker, it will not work since they do not have a focal point.
Explanation:
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hope this helps