Chemistry
How do the following help in bringing about a chemical change? Explain each with a suitable example.
(a) Pressure
(b) Light
(c) Catalyst
(d) Heat
Related Questions
(a) Define a chemical reaction.
(b) What happens during a chemical reaction?
(c) What do you understand by a chemical bond?
Give one example each that illustrates the following characteristics of a chemical reaction:
(a) evolution of a gas
(b) change of colour
(c) change in state
(a) Define catalyst.
(b) What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
(c) Name three biochemical catalysts found in the human body.
What do you observe when dilute sulphuric acid is added to granulated zinc?