A lump of sea salt dissolves in water. A large lump of sea salt was ground and changed into powder. Will the powdered sea salt have the same taste as the lump of sea salt?
Important Questions on Changes Around Us
A lump of sea salt dissolves in water. A large lump of sea salt was ground and changed into powder. Are the lump of sea salt and the powdered sea salt different substances?
A lump of sea salt dissolves in water. A large lump of sea salt was ground and changed into powder. Is making salt powder a physical change? Why?
Some changes are desirable and some are not. Tick (✓) if the change is desirable and cross (✗) if it is undesirable. Give reasons for your choice.
Burning waste paper
Some changes are desirable and some are not. Write whether the process given below is a desirable change or an undesirable change. Give reasons for your choice.
Allowing kitchen waste to decompose in open.
Some changes are desirable and some are not. Write whether the process given below is a desirable change or an undesirable change. Give reasons for your choice.
Changing vegetable and fruit waste into manure in a pit.
Some changes are desirable and some are not. Write if the process given below is a desirable change or an undesirable change. Give reasons for your choice.
Leaving curd in a warm place and let it turn very sour.
Some changes are desirable and some are not. Write whether the process given below is desirable or undesirable change. Give reason for your choice.
Leaving cooked food uncovered for a long time.
Some changes are desirable and some are not. Write whether the process given below is desirable or not. Give reason for your choice.
Germinating onion seeds in a kitchen garden.
