When you chew plain bread, chapati or bhakari for a long time, it tastes sweet. What could be the reason?

Priya got injured in an accident and hurt her long bone and later on she was also diagnosed with anaemia. What could be the probable reason?

Now , measure the length of a bench by means of the span of your hand . Ask your friends to do the same . Did each of you obtain the same measure for that bench ? What could be the reason ?

Veena observes that during winter setting of milk into curd takes more time while during summer, the same process happens faster. She asks about this difference in time taken to her elder sister. She also asks her sister about why certain reactions occur rapidly while others occur slowly. Her sister explains her about the various factors that affect the rate of chemical reactions. Based on the above scenario, answer the following questions. The reaction of aluminum metal with dilute hydrochloric acid takes place faster as compared to zinc metal. What could be the reason for this difference?

When ZnO is heated it turns yellow and returns back to original white colour on cooling. What could be the reason?

Smita was working in a garage with the doors closed and automobiles engine running. After some time she felt breathless and fainted. What could be the reason? How can she be treated?

Take a long rubber band and cut it at one point . At one of its ends tie a clean washed stone or a 50g weight as shown in figure Now hold the other end of the rubber band and make a mark there . Keep the stone hanging in air and measure the length of the rubber band from the stone to the mark made earlier . now take water in a pot and hold the rubber band at such a height that the stone sinks in it . again measure the length of the rubber band up to the mark . : What could be the reason for a shorter length of the rubber band in water ? :

Use your brain power Sometimes, you may notice a black powder or white discs floating on the pickle or murabba, when a jar is opened after a long time. What exactly is this? Why are such food items not good to eat?

Sometimes, you may notice a black powder or white discsfloating on the pickle or murabba, when a jar is opened after a long time. What exactly is this? Why are such food items not good to eat?