This post is a lesson on heat energy and temperature changes for changes of state. The focus here is on heating a solid until the substance is completely vaporized. Assuming that the substance has a clean melt, followed by complete conversion to the gas phase, then a heat energy vs. temperature plot of those changes can be interpreted to produce important thermodynamic constants; namely specific heat capacity within a state and specific molar heat values for phase transitions. The following diagram provides some details.
It is important to note that temperature remains constant during phase changes and so specific molar heat values determined from a heat-temperature plot do not contain a temperature term. Additionally, the slopes obtained for each state, when adjusted for one gram of substance, are the specific heat capacities of each state.
Armed with these thermodynamic constants, one can determine the amount of heat energy needed to take a substance through its phase changes!
That's all for now. Have a good one!
A Publication of http://www.excellenceinlearning.biz
No comments:
Post a Comment
Comments or Questions? Feedback is always welcome!