Lemon ?+ Eno + Baking soda || Science Experiment ?u200d?|| #theexking #shorts #ebulljet #shortsindia

Reshma is the student of class X in a city school. One day she was sitting in the school garden with her friends during the recess. There was a tall tree at the edge of the garden having a large honeycomb attached to it. Some students were playing cricket in te school playground. Suddenly the cricket ball hit the honeycomb due to which a large numbr of honey-bees started flying here and there. Reshma was stung on her face by a honey-bee. The sting was so painful that Reshma started crying. She was immediately rushed to the science laboratory. One of her classmates Shanta gave her vinegar solution to rub on the stung area to get relief from pain. Another clasmate Amarjit, howerver, asked Reshma to rub baking soda solution on the stung area of face. On rubbing baking soda solution, Reshma felt a lot of relief from pain. (a) What kind of liquid is injected into the skin when a honey-bee stings a person? (b) Why did rubbing baking soda solution on the stung area of skin give relief from pain? (c) What type of chemical reaction takes place when baking soda solution is rubbed on the honey-bee sting area? (d) Why do you think rubbing the honey-bee sting area with vinegar could not give relief from pain? (e) Name one plant whose stinging hair on leaves inject a similar liquid to that injected by honey-bee sting and can be treated by rubbing baking soda solution? (f) What vaues are displayed by Amarjit in this episode?

State whether the following statements are true or false: When baking soda is mixed with lemon juice bubbles are formed with the evolution of a gas. It is a physical change

A carpet lying on ground has length L , width a and a small thickness d . It is rolled over a light cylindrical pipe of radius r = (L)/(100 sqrt(pi)) and kept on a level ground. Increase in gravitational potential energy of the carpet is DeltaU_(1) (compared to its initial position when it was lying flat). In another experiment the carpet was folded to give it a shape of a cuboid (see figure) having width b . When this is placed on level ground its gravitational potential energy is Delta U_(2) higher than its initial position (flat on ground). It is given that d = 10^(-4) L . Find b for which DeltaU_(1) = Delta U_(2) . [Take sqrt((pi)/(2)) = 1.25 ]