Question

When water at 0°C freezes to form ice at same temperature of 0°C, then
i. Absorbs some heat
Releases some heat
iii. Neither absorbs or releases
iv. Absorbs exactly 3.34 -10% J/ kg of heat
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Answer 1

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ii. Releases some heat

Reason : When the liquid water turns to solid ice we find that water freezes without getting any colder. That's because the latent heat of fusion is being lost from the liquid as it solidifies and the temperature of the water does not fall so quickly.

Hope It Will Help.❤

Answer 2

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Heat" phase changes, and calorimetry: Different materials require different quantities of heat to raise the temperature of a given mass of the material by a specified number of degrees. Different materials absorb energy in different ways. The energy may increase the jiggling motion of molecules, which raises the temperature; or it may increase the amount of internal vibration or rotation within the molecules and go into potential energy, which does not raise the temperature. Generally, a combination of both occurs. Whereas 1 gram of water requires 1 calorie of energy to raise its temperature 1 Celsius degree, it takes only about one-eighth as much energy to raise the temperature of a gram of iron by the same amount. Water absorbs more heat per gram than iron for the same change in temperature. We say water has a higher specific heat capacity (sometimes simply called specific heat) Heat is energy in transit from one body to another as a result of a temperature difference. The quantity of heat Q required to raise the temperature of a quantity of material by a small amount T is proportional to T . This proportionality can be expressed either in terms of the mass m and specific heat capacity c or in terms of the number of moles n and the molar heat capacity C= Mc. Here M is the molar rmass and m = nM. To change a mass m of a material to a different phase at the same temperature (such as liquid to solid or liquid to vapor) requires the addition or subtraction of a quantity of heat The amount of heat is equal to the product of m and L, the heat of fusion, vaporization, or sublimation.