Which of the following would absorb the least amount of energy?
Question 7 options:
a) Water freezing
b) Steam condensing
c) CO2 gas becoming a solid
d) Solid iodine sublimating
e) Hot acid cooling from 35 °C to 25 °C
e) Hot acid cooling from 35 °C to 25 °C
To determine which option would absorb the least amount of energy, we need to understand the concept of energy absorption or release during phase changes and temperature changes.
When a substance undergoes a phase change (like freezing, condensing, or sublimating), it requires or absorbs energy. On the other hand, when the temperature of a substance changes, it either gains or loses energy depending on whether it is warming up or cooling down.
Let's analyze each option:
a) Water freezing: When water freezes, it changes from a liquid to a solid. This phase change requires energy absorption, so it would absorb a significant amount of energy.
b) Steam condensing: When steam condenses, it changes from a gas to a liquid. Similar to freezing, this phase change requires energy absorption, so it would also absorb a significant amount of energy.
c) CO2 gas becoming a solid: When carbon dioxide (CO2) gas becomes a solid, it undergoes a phase change called deposition. This process also requires energy absorption, so it would absorb a considerable amount of energy.
d) Solid iodine sublimating: When solid iodine sublimates, it changes directly from a solid to a gas without going through the liquid phase. Sublimation requires energy absorption, so it would absorb a substantial amount of energy.
e) Hot acid cooling from 35 °C to 25 °C: In this option, the temperature of the acid is decreasing, which means it is releasing energy. Cooling down from 35 °C to 25 °C would result in the acid losing heat or energy. Therefore, out of the given options, this would be the one that absorbs the least amount of energy.
In summary, the answer is:
e) Hot acid cooling from 35 °C to 25 °C