Chapter U2, Problem SIII6RE

Interpretation Introduction

Interpretation : Out of cold bread or warm bread right out of oven, the one which will smell better is to be selected and explained.

Concept Introduction :

One can smell gaseous molecules more easily. Warming or heating a liquid or solid generally gives it a more intense smell.

Answer to Problem SIII6RE

Cold bread will not smell as much as warm bread that comes right out of the oven. Heating causes some large molecules to show smell easily as they change to gas and as more molecules are present in air, it is easy to detect them.

Explanation of Solution

Molecules that can exist in gaseous form can show smell easily as they can reach the receptor sites of our nose.

Some large molecules that are solids or liquids at room temperature may undergo a phase change upon heating. Heating may cause them to show smell easily as more molecules are present in air and it is easy to detect them.

Cold bread will not smell as much as warm bread that comes right out of the oven. In order to show smell, the large molecules present in bread must undergo a phase change. On heating, the molecules of bread batter change to gas and give out an intense smell. When there are more molecules in air, they become easy to detect through smell.

Conclusion

Large molecules may change their phase upon heating and are easy to detect them through smell as they can easily reach our nose.