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प्रश्न
State whether the following is physical or chemical changes.
heating of water —
उत्तर
physical change,
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
Melting of ice is a
What is the name of the process in which a solid turns directly into a gas ?
Why is solid carbon dioxide known as dry ice ?
What is the name of the process due to which dry ice changes into carbon dioxide gas ?
Fill in the following blank with suitable words :
Scientists say that there are actually five states of matter : solid, liquid, gas, .................... and ...................
Under what conditions heat can be given to a substance without raising its temperature ?
Explain why, there is no rise in temperature of a substance when it undergoes a change of state though heat is supplied continuously.
How does applying pressure (or compression) help in the liquefaction of a gas ?
State the three effects of heat on matter
Give reasons:
How is interconversion of states of matter different from chemical reaction?
What happens to a metal ball when it is heated? What does this show?
Fill in the blanks:
The molecules are at a greater distance in ______ compared to liquids.
Write whether the following statement is true or false:
Solids have the larger inter-molecular space
Write whether the following statement is true or false:
A gas has no free surface.
Explain the term melting
Fill in the blanks with the correct word/s from the bracket.
Ice on absorption of heat converts to ‘X’ a process called ____ [vaporization / melting]. ‘X’ changes to water vapour on ____ [heating / cooling]. Water vapour changes back to ‘X’ on ____ [freezing / condensation]. The constant temperature at which ice changes into ‘X’ is called its ____ [fusion point / melting point / boiling point].
Halima picks up a small stone from the ground and puts it in the water in a dish. Does the shape of the stone change?
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
Are any new products formed during the above process.
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
Can the change be reversed or is it irreversible?
Complete the statement by filling the blank with the correct word given below.
Conversion of vapour [or gas] into a liquid is termed ____________.
