5. If identical amounts of heat are applied to 100 g of each of the substances l

Question

5. If identical amounts of heat are applied to 100 g of each of the substances listed below, all initially at 25 C, which one will have the highest final temperature? Explain with numbers to receive full credit . ethanol . granite TABLE 6.4 Specific Heat Capacities of Some Common Substances Specific Heat Capacity, C (J/g .°C)" Substance Elements Lead Gold Silver Copper Iron Aluminum Compounds Ethanol Water Materials Glass (Pyrex) Granite Sand At 298 K 0.128 0.128 0.235 0.385 0.449 0.903 2.42 4.18 0.75 0.79 0.84

Explanation / Answer

Ans 5 :

When the substances are given soem amount of heat , their temperature rises.

It can be given as :

Heat (Q) = mass of substance x specific heat capacity x change in temperature

So for the same amount of heat given , the lower the specific heat capacity , higher will be the change in temperature and the final temperature of the substance.

In the substances given , the lowest specific heat capacity is of Pb (Lead) i.e. 0.128 J/g.oC , so it will have the highest final temperature amongst all.

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