Which of these is a reversible change?
Metal rusting
Baking a cake
Freezing orange juice to make an ice lolly
None of these
Heart beat is a _________ change.
None periodic
Periodic
Reversible
__________ is the process by which a solute gets dissolved in a solvent.
Dissolution
Evoporation
Boiling
Curdling of milk is __________ reaction.
Endothermic
Exothermic
Both A&B
___________ is the conversion of a liquid into its vapour state at any temperature below its boiling point.
Condensation
Will the steam from seawater be salty?
Yes
No
Some of the steam will be salty
Dissolution of common salt is a ________ change.
Physical
Chemical
Non periodic
___________ is an exothermic reaction.
Respiration
Perspiration
Digestion
Some changes are __________ at one time but _________ at another time.
Desirable, Undesirable
Man made, desirable
Slow, undesirable
Fast
The change which can be reversed by changing the condition is known as ________ change.
Irreversible
