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प्रश्न
State whether the following statement is true or false. If false write the correct statement.
During a chemical change the composition of the original substance is not altered and the change is irreversible.
विकल्प
True
False
उत्तर
False.
Correct Statement: During a chemical change the composition of the original substance is altered and the change is irreversible.
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संबंधित प्रश्न
What is the physical state of water at 250°C.
Convert the following temperature to the celsius scale.
293 K
Convert the following temperature to the celsius scale.
470 K
Convert the following temperature to the Kelvin scale.
25°C
The boiling point of water is 100° C. Express this in SI units (Kelvin scale).
What is the name of the process in which a solid turns directly into a gas ?
Define the following term Boiling.
Why does a desert cooler cool better on a hot, dry day ?
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Write whether the following statement is true or false:
The intermolecular force of attraction is the weakest in gases.
Name the phenomenon which causes the following changes:
Formation of water vapour from water
Give two examples of the following:
Substances which do not change their states.
The state of matter which has no definite shape or volume is called
Explain the term melting point
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.
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].
What is it made from? Why?
The sheets used for roofing.
Give the reason for the following:
The kinetic energy of molecules of gases is very large & of solids, the least.
Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in the following case.
During liquefaction, the particles ________ energy.
