Class 7 Exam > Class 7 Questions > Upon heating, gases become lighter. Why?a)Inc...
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Upon heating, gases become lighter. Why?
- a)Increase in molecular spaces
- b)Decrease in molecular spaces
- c)Breaking of molecules
- d)Formation of new molecules
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Upon heating, gases become lighter. Why?a)Increase in molecular spaces...
Upon heating, the molecules in the gases go further away from each other and thus become lighter.
Most Upvoted Answer
Upon heating, gases become lighter. Why?a)Increase in molecular spaces...
Explanation:
When gases are heated, they tend to become lighter. This can be explained by the following reasons:
Increase in molecular spaces:
- When a gas is heated, its molecules gain kinetic energy, which causes them to move faster and collide with each other more frequently.
- These collisions result in an increase in the distance between the molecules, leading to an expansion of the gas.
- As the gas expands, its volume increases while its mass remains the same, resulting in a decrease in its density.
- Since density is defined as mass per unit volume, a decrease in density leads to a decrease in the weight of the gas.
Example:
- Let's consider a balloon filled with air. When the balloon is heated, the air molecules inside gain energy and move faster.
- As the air molecules move faster, they collide with each other more frequently and with greater force.
- These collisions cause the air molecules to spread out, increasing the space between them and expanding the balloon.
- As a result, the same amount of air occupies a larger volume, reducing the density of the gas and making the balloon feel lighter.
Conclusion:
- In conclusion, when gases are heated, the increase in molecular spaces due to higher kinetic energy results in the gases becoming lighter.
- This phenomenon is commonly observed in various situations, such as hot air balloons rising in the air or the expansion of gases in a container when heated.
When gases are heated, they tend to become lighter. This can be explained by the following reasons:
Increase in molecular spaces:
- When a gas is heated, its molecules gain kinetic energy, which causes them to move faster and collide with each other more frequently.
- These collisions result in an increase in the distance between the molecules, leading to an expansion of the gas.
- As the gas expands, its volume increases while its mass remains the same, resulting in a decrease in its density.
- Since density is defined as mass per unit volume, a decrease in density leads to a decrease in the weight of the gas.
Example:
- Let's consider a balloon filled with air. When the balloon is heated, the air molecules inside gain energy and move faster.
- As the air molecules move faster, they collide with each other more frequently and with greater force.
- These collisions cause the air molecules to spread out, increasing the space between them and expanding the balloon.
- As a result, the same amount of air occupies a larger volume, reducing the density of the gas and making the balloon feel lighter.
Conclusion:
- In conclusion, when gases are heated, the increase in molecular spaces due to higher kinetic energy results in the gases becoming lighter.
- This phenomenon is commonly observed in various situations, such as hot air balloons rising in the air or the expansion of gases in a container when heated.
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Upon heating, gases become lighter. Why?a)Increase in molecular spacesb)Decrease in molecular spacesc)Breaking of moleculesd)Formation of new moleculesCorrect answer is option 'A'. Can you explain this answer?
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