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प्रश्न
Define physical change. Give two examples for the above changes.
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उत्तर
Physical change: A temporary change in which no new substance is formed, the composition of substance remains the same, though its state, shape and size may change.
Example of physical change:
- Change of water into its vapours.
- Heating of iron rod.
संबंधित प्रश्न
Classify the following as chemical or physical change:
Making a fruit salad with raw fruits
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
State three differences between evaporation and boiling
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Define a chemical change. Give two examples of the above changes.
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
Give four difference between physical and chemical changes.
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered a ___________ change.
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
Select the chemical changes from the following list of changes
Respiration in mammals.
Select the chemical changes from the following list of changes
Breaking of glass
When ice melts to form water, change occurs in its
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Stretching gold coin into a ring is a ______ change.
State whether the following statement is true or false:
Stretching of rubber bands is not a physical change.
The change of state of a substance from solid to liquid and liquid to gas is ______.
Mention some of the different conditions needed for chemical changes to occur.
