which phase change is endothermic ?
(1)gas-->solid
(2)gas-->liquid
(3)liquid-->solid
(4)liquid-->gas
The liquid to gas phase transformation (evaporation) is an endothermic process. It requires heat to be accomplished.
Good answer Lala.
The phase change that is endothermic is (4) liquid to gas.
To determine which phase change is endothermic, we need to understand the concepts of exothermic and endothermic processes.
An exothermic process is one that releases heat energy to the surroundings, resulting in a decrease in temperature. In contrast, an endothermic process is one that absorbs heat energy from the surroundings, resulting in an increase in temperature.
Now, let's analyze each of the given phase changes to identify which one is endothermic:
(1) Gas to Solid: This phase change is known as deposition or condensation. In this process, a gas directly transforms into a solid. Since it involves the release of heat energy, this change is exothermic, not endothermic.
(2) Gas to Liquid: This phase change is known as condensation. When a gas cools down, it transitions into a liquid. The process involves the release of heat energy, making it an exothermic reaction, not endothermic.
(3) Liquid to Solid: This phase change is known as freezing. When a liquid loses heat energy and transforms into a solid, it releases heat to the surroundings. Similar to the previous cases, this change is exothermic, not endothermic.
(4) Liquid to Gas: This phase change is known as vaporization or evaporation. When a liquid gains heat energy and transforms into a gas, it absorbs heat from the surroundings. Therefore, this change is endothermic.
Based on the explanations provided, the phase change that is endothermic is (4) liquid to gas.