HEATING+CURVES

__Visual Representation of Molecules in a Heating Curve__ - it looks better when it moves http://www.dlt.ncssm.edu/tiger/Flash/phase/HeatingCurve.html

EXAMPLE QUESTIONS:

1.What is the final temperature we can reach if we apply 5,072J to 250g of water at 15.0 degree celsius? Answer: 20.4 degree celsius

2. When does the potential energy of a substance change? Answer: During a phase change because temperature remains constant, so kinetic energy remains constant, causing an change in potential energy.

3.In which __process__ does a solid change directly into __vapor__ ?
 * Answer** : //Sublimation//

4.What happens to Kinetic Energy when temperature decreases? Answer: Kinetic Energy also decreases because the molecules start to slow down and move when temperature decreases. 5) Why does the potential energy of a substance increase during the melting process? Ans-During the melting process,heat is absorbed by the substance in the form of potential energy even though kinetic energy and the temperature is constant.Both the solid and liquid phase of the substance are present during the melting process.However,as time passes,the amount of liquid increases as the amount of solid decreases.As the liquid phase of a substance has more potential energy than the solid phase,the potential energy of the substance increases during the melting process.

FEEL FREE TO POST SOME HEATING CURVE PRACTICE QUESTIONS AND GET SOME FRIENDLY NEIGHBOR ADVICE (Just take a question from the class notes and change the numbers. Now it's a whole new question to solve!)

Feel free to add in You Tube videos that you may have found helpful.

Here are some problems and explanation on PHASE CHANGE PROBLEMS.

Notes on temp and different scales are here: These calculation wks have answers:

Review of the Heating Curve Chart: https://www.youtube.com/watch?v=YG77v1PwQNM Thorough explanation of heating as well as cooling curve: https://www.youtube.com/watch?v=XEgQ2ToXRhw