Explain how burning of LPG in a gas stove involves both physical and chemical changes.
Give any other example of the same kind from everyday life.
what is physical change, chemical change, slow change, fast change, periodic change, non-periodic change, desirable change and undesirable change ?
all physical changes are reversible and only chemical changes are irreversible.do you agree?give reasons and examples.
identify two changes that can be reversed while preparing dishes at home
who invented television?
What are periodic and non-periodic changes ?
If we break a glass it is reversible change or irreversible?
HOT QUESTION: THINK AND ANSWER:
1) Tearing of paper is irreversible. It is, therefore , a chemical change. Do you agree? Give reasons.
2) A potato remains a potato even after it is cooked. Therefore, cooking is a physical change. Do you agree? Give reasons.
3) When sugar dissolves in water, it disappears. That means it must have changed into a new substance. Therefore, dissolving is chemical change. Do you agree? Give reasons.
define-1. slow change 2. fast change
ans needed urgently
why are iron water pipes galvanised
Explain how burning of LPG in a gas stove involves both physical and chemical changes.
Give any other example of the same kind from everyday life.
what is physical change, chemical change, slow change, fast change, periodic change, non-periodic change, desirable change and undesirable change ?
all physical changes are reversible and only chemical changes are irreversible.do you agree?give reasons and examples.
identify two changes that can be reversed while preparing dishes at home
who invented television?
What are periodic and non-periodic changes ?
If we break a glass it is reversible change or irreversible?
Regards
Alishba
HOT QUESTION: THINK AND ANSWER:
1) Tearing of paper is irreversible. It is, therefore , a chemical change. Do you agree? Give reasons.
2) A potato remains a potato even after it is cooked. Therefore, cooking is a physical change. Do you agree? Give reasons.
3) When sugar dissolves in water, it disappears. That means it must have changed into a new substance. Therefore, dissolving is chemical change. Do you agree? Give reasons.
define-1. slow change 2. fast change
ans needed urgently
why are iron water pipes galvanised