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प्रश्न
State whether the following statement is true or false. If false write the correct statement.
During physical changes, the composition of the original substance is not altered, but the properties of the original substance are altered.
विकल्प
True
False
उत्तर
True
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संबंधित प्रश्न
What is the physical state of water at 25°C.
Is there any change in temperature during the change of phase?
Convert the temperature of 573 K to the Celsius scale.
The boiling point of alcohol is 78° C. What is this temperature on Kelvin scale ?
Give the usual name for the following :
Heat required to change the state of a substance without changing the temperature.
What is meant by saying that the latent heat of fusion of ice is 3.34 × 105 J/kg ?
Name one common substance which can be easily changed from one state to another by heating or cooling.
What is the name of the process due to which dry ice changes into carbon dioxide gas ?
Explain why, there is no rise in temperature of a substance when it undergoes a change of state though heat is supplied continuously.
On converting 308 K, 329 K and 391 K to Celsius scale, the correct sequence of temperatures will be :
Which of the following energy is absorbed during the change of state of a substance ?
Define the following terms: Sublimation
Define the following terms: Melting point
Differentiate between: Gas and vapour
Explain the term vaporization
State which of the following statement is true or false. If false write the correct statement.
The conversion of water to ice is called freezing.
State which of the following statement is true or false. If false write the correct statement.
Atoms/molecules in gases move only about their own positions.
Why does this happen?
Kerosene left open in a dish disappears.
State which of the three states of matter Le. solids, liquids or gases – have
(a) No definite volume
(b) A definite shape
(c) High density
(d) No free surfaces
(e) Particles – which diffuse very easily.
With reference to the liquid state of matter – answer the following
The heat energy supplied to the liquid is absorbed by its molecule & stored as which form of energy.
