Describe the energy changes which take place in an radio.

(a) How can you visualise a power of 1 k W ? (b) Describe the energy changes that take place when you stop your car by using the brakes.

A bulb lights up when connected to a battery. State the energy change which take place : (i) in the battery. (ii) in the bulb.

Name and describe the type of succession which takes place in organic habitats.

Describe the events that take place in Metaphase I

What is rusting? Describe the elecochemical changes that take place during the rusting of iron.

List out the changes which take place during gene expression.

Briefly describe the valence bond theory of covalent bond formation by taking an example of hydrogen. How can you interpret energy changes taking place in the formation of dihydrogen?

Briefly describe the valence bond theory of covalent bond formation by taking an example of hydrogen. How can you interpret energy changes taking place in the formation of dihydrogen?