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प्रश्न
Tick the most appropriate answer.
Chemical changes involve
विकल्प
change in shape
change in size
change in molecular composition
none of these
उत्तर
change in molecular composition.
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संबंधित प्रश्न
What do you mean by the change of state? Write the flow chart showing the complete cycle of change of state.
Dissolving salt in water is a reversible change.
Convert the temperature of 573 K to the Celsius scale.
What is the name of the process in which a solid turns directly into a gas ?
What is the common name of solid carbon dioxide ?
Fill in the following blank with suitable words :
When steam condenses to form water, heat is .......................
Explain why, there is no rise in temperature of a substance when it undergoes a change of state though heat is supplied continuously.
When water is heated to a temperature x, it gets converted into steam at temperature x by a process called R. And when steam at temperature x is cooled, it gets reconverted into water at the same temperature x by a process called S.
- How much is the value of x in Kelvin ?
- What is the process R called ?
- What is the name of the energy absorbed during the process R ?
- What is process S known as ?
- What is the name of energy released during the process S known as ?\\
What do you observe when: little amount of curd is added to a bowl containing warm milk and kept for five hours.
Define the following terms: Boiling point
Define the following terms: Liquefaction
The state of matter which has no definite shape or volume is called
Explain the term freezing
Fill in the blank with the correct word Given below.
Intermingling of molecules is called ____
State if the following is a physical property of a substance.
Water acidified with dilute sulphuric acid is a good conductor of electricity.
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.
Select the correct answer from A, B, C, D & E for the statement given below:
The state of matter which has ___________ least density & no free surfaces.
Give the reason for the following
Solids cannot be compressed, but gases are highly compressible.
