Question

11. Imagine you have 1kg each of iron, glass, and water, and that all three samples are at 10°C. Rank the samples from lowest to highest temperature after 100J energy is added to each sample.

Answer 1

Answer: water,glass and iron

Explanation: because of their hear capacity .water have more therefore have least change in temperature,followed by glass and iron last

Answer 2

The rank of samples from lowest to highest temperature will be as follows:  Water<Glass<Iron.

• The increase in temperature of a given amount of substance due to a given amount of heat depends upon its specific heat capacity.
• Specific heat capacity of a substance is the amount of energy required to raise the temperature of the unit mass of the substance by 1°C.
• Since we have taken an equal amount of every substance and suppled an equal amount of energy to each of them, the substance with the highest specific heat will have the lowest temperature.
• Among water, iron, and glass, the specific heat of water (4186J/kg-K) is the highest and iron has the lowest specific heat (449J/kg-K) and glass has a specific heat value between that of the iron and water (800 J/kg-K).
• Hence the order of temperatures will be, Water<Glass<Iron.