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When water is heated from 0° C to 20° C its volume:
- a)first decreases and then increases
- b)goes on increasing
- c)remains constant up to 15°C and then increases
- d)goes on decreasing
Correct answer is option 'A'. Can you explain this answer?
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When water is heated from 0° C to 20° C its volume:a)first d...
When water is heated from 0°C, its volume decreases because its density increases and you can see this effect upto 4°C. Since the density of ice is maximum at 4°C, afterwards as the density decreases the volume increases. The main reason for this is hydrogen bond in ice gets cleaved due to the melting of ice.
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When water is heated from 0° C to 20° C its volume:a)first d...
Explanation:
When water is heated from 0°C to 20°C, its volume does not increase uniformly. It first decreases and then increases. This can be explained by the anomalous expansion of water.
Anomalous Expansion of Water:
Water is an exception to the general rule that liquids expand on heating and contract on cooling. Water exhibits anomalous expansion, which means that it does not follow this general rule. The anomalous expansion of water can be explained by the following points:
- When water is heated from 0°C to 4°C, its volume decreases.
- This is because the water molecules are held together by hydrogen bonds, which are stronger at lower temperatures. As the temperature increases, these bonds start breaking and the water molecules start moving apart.
- However, when water is heated beyond 4°C, its volume starts increasing.
- This is because the thermal motion of the water molecules overcomes the hydrogen bonds and the water molecules start moving apart more rapidly.
Effect of Temperature on Water Volume:
Based on the above explanation, we can understand the effect of temperature on water volume as follows:
- When water is heated from 0°C to 4°C, its volume decreases.
- When water is heated from 4°C to 20°C, its volume increases.
Therefore, the correct answer is option 'A': first decreases and then increases.
When water is heated from 0°C to 20°C, its volume does not increase uniformly. It first decreases and then increases. This can be explained by the anomalous expansion of water.
Anomalous Expansion of Water:
Water is an exception to the general rule that liquids expand on heating and contract on cooling. Water exhibits anomalous expansion, which means that it does not follow this general rule. The anomalous expansion of water can be explained by the following points:
- When water is heated from 0°C to 4°C, its volume decreases.
- This is because the water molecules are held together by hydrogen bonds, which are stronger at lower temperatures. As the temperature increases, these bonds start breaking and the water molecules start moving apart.
- However, when water is heated beyond 4°C, its volume starts increasing.
- This is because the thermal motion of the water molecules overcomes the hydrogen bonds and the water molecules start moving apart more rapidly.
Effect of Temperature on Water Volume:
Based on the above explanation, we can understand the effect of temperature on water volume as follows:
- When water is heated from 0°C to 4°C, its volume decreases.
- When water is heated from 4°C to 20°C, its volume increases.
Therefore, the correct answer is option 'A': first decreases and then increases.
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Community Answer
When water is heated from 0° C to 20° C its volume:a)first d...
When water is heated from 0 0C, its volume decreases because its density increases and you can see this effect upto 4 0C. Because the density of ice is maximum at 4 0C. Afterwards as the density decreases the volume increases. The main reason for this is hydrogen bond in ice gets cleaved due to the melting of ice.hope it will help
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When water is heated from 0° C to 20° C its volume:a)first decreases and then increasesb)goes on increasingc)remains constant up to 15°C and then increasesd)goes on decreasingCorrect answer is option 'A'. Can you explain this answer?
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