(4) What is the use of kink in the clinical thermometer?
(5) What happens when soap is applied on the stain of turmeric on the cloth
(6) What is rusting of iron?
Answers
Explanation:
Kink in the clinical thermometer helps to prohibit the falling of mercury present in the capillary tube into the bulb ensuring that a person should get the correct reading even after taking the thermometer out from his/her mouth.
Answer:
4) Kink in the Mercury thermometer helps to prevents the falling of mercury present in capillary tube into bulb. It ensures that the user takes the correct reading of temperature.
That's the reason a person before taking a new reading must give a sudden shake to the clinical thermometer so that the mercury level comes to normal .
Hence Kink in mercury thermometer plays a important role without which appropriate reading of temperature is not possible.
5) Curry contains turmeric powder and soap is basic in nature. ... Hence, when soap (which is basic in nature) is scrubbed on the stain, the stain turns red. When the cloth is washed with plenty of water, the soap is removed and the yellow colour of the stain reappears.
6)Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Here is the word equation for the reaction: iron + water + oxygen → hydrated iron(III) oxide.
Hope this is helpful