Question

Which substance will have the largest temperature change if the same amount of heat is added to each of them?ethanol, c2h5oh(l) water, h2o(l) aluminum, al(s) iron, fe(s)?

Answer 1

Answer: Option (d) is the correct answer.

Explanation:

Specific heat is defined as the amount of heat necessary to raise the temperature of a unit mass of substance.

Relation between heat energy, specific heat and temperature change is as follows.

                            q = $m \times C \times \Delta T$

where,       q = heat energy

                  m = mass

                  C = specific heat

             $\Delta T$ = change in temperature

Specific heat of ethanol is 2.46 $J/g ^{o}C$, water is 4.18 $J/g ^{o}C$, Al is 0.902$J/g ^{o}C$, and Fe is 0.450 $J/g ^{o}C$,  

As specific heat is inversely proportional to change in temperature. Therefore, smaller is the value of specific heat more will be the change in temperature.

So, when mass of all the given species is constant. Then change in temperature of iron (Fe) will be the largest because it has the least value of specific heat.

Thus, we can conclude that out of the given options iron (Fe) will have the largest temperature change if the same amount of heat is added to each of them.

Answer 2

The substance that will have the largest temperature change is Iron (Fe). In order to find out which one would have the largest temperature change, you will need the specific heat of the substances. The specific heat is inversely proportional to temperature change. Since Iron has the lowest specific heat, it now has the highest temperature change.