Chemistry
Name the following:
The salt obtained when a chemical change takes place on addition of iron to dilute sulphuric acid.
The product obtained during a physical change when water converts from a liquid into a solid.
The product of the chemical change on keeping a polished iron nail exposed to the atmosphere.
A form of energy required for a chemical change.
The gaseous product of the chemical change which takes place during respiration in living organisms.
Related Questions
Select the correct answer from the choice in bracket to complete each sentence:
A change in which a substance retains its identity is a …………… [physical/chemical] change.
Matter is added or removed during a …………… [chemical/physical] change.
Energy required for completion of a physical change is …………… [released/absorbed] when the change is reversed.
Dissolution of lead nitrate in water is deemed as a …………… [physical/chemical] change.
A change in which matter undergoes a change but the total mass of substance is unaltered is a …………… [physical/chemical] change.
State which of the following 1 to 5 pertain to —
A: Physical Change
B: Chemical change
Sublimation.
Fermentation.
Liquefaction or condensation.
Magnetization.
Respiration.
Give reasons why the following are considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
A bright light is seen evolved when a strip of magnesium is heated.
Sulphur when burnt in air evolves a gaseous acidic product.
An iron nail kept open in the atmosphere rusts.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
Match the examples of changes in List I with the correct type of change in List II.
List I List II 1. Burning of paper A: Physical change 2. Ringing of an electric bell B: Chemical change 3. Curdling of milk 4. An electric light is switched on. 5. Melting of butter