- “Burning a match stick” is an example of chemical change.
- The properties of chemical changes are permanent and irreversible.
- “Digestion of food” is an example of chemical change.
- Substances that cause water pollution are called pollutants.
- Heavy mechanical complexes use a large amount of water for cooling.
- A change that can go forwards or backwards is known as “Reversible change”.
- A change that cannot go back is called “Irreversible change”.
- Plastic is prepared from petroleum by the process called Polymerization.
- In ghee industry, vegetable oil is converted into solid fat by a process called Hydrogenation.
- The process of hydrogenation takes place in the presence of nickel element at 250°-300°C.