Name_____________________

Date: ________Period________

(We watched this 3 minute one in most classes)

Instructional 3 minute video at: http://www.kentchemistry.com/links/Matter/HeatingCurve.htm

(I had planned on watching this 15 minute one all classes but didn’t have time in most; it has more detail than is needed for the quiz but has the most complete explanation)

15 minutes video on heating and cooling curves water, ethanol, etc: https://www.youtube.com/watch? v=XEgQ2ToXRhw

Learner outcome for heating curve 10 min video: https://www.youtube.com/watch?v=eZPlqyh37hw

Simulation of heating curve: http://www.claudiocancelli.it/web_education/fisica/heatingcurve.swf

(currently the one on web site not working) (1 calorie = 4.16 joules)

Showing the calculations step by step: http://chemistry.bd.psu.edu/jircitano/heatcurv.html

Name_____________________

Date: ________Period________

PHASES OF MATTER NOTES PS 2017

1. Memorize at least 1 word for each transition (I’ll write the one I will use as the first one):

F

E

A C

B D

A) Solid to liquid _________________ or ______________ or ____________

B) Liquid to solid __________________ or ______________ or ___________

C) Liquid to gas __________________ or ______________ or ____________

D) Gas to liquid __________________ or ______________ or ____________ E) Liquid

to gas (at any temp) __________________

F) Solid to gas __________________

Describe and sketch:Solid:

SOLID

LIQUID

GAS

Name_____________________

Date: ________Period________

Liquid:

Gas:

Name_____________________

Date: ________Period________

Energy is the ability to do work or cause change

Potential Energy is the energy of (relative) POSITION

Kinetic Energy is the energy of MOTION ( K.E. = ½ M v2 )

Temperature is a measure of the average kinetic energy of the material

A CALORIE is the amount of energy needed to change the

temperature of 1 gram of water 1o C

Conversion factor: 1 calorie = 4.18 joules

One Calorie (food calorie) = 1,000 calories (since we usually measure body mass in kilograms)

Name_____________________

Date: ________Period________Heating Curve Worksheet (ver 2)

The diagram below is a plot of temperature vs. time. It represents the heating of what is initially ice at -10oC at a near constant rate of heat transfer.

 

1) a)What phase or phases are present during segment (1) _______________________________________

b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ________________________________________________________________ __________________________________________________________________________________c) What phase change, if any, is taking place? _____________________________________________

2) a)What phase or phases are present during segment (2) _______________________________________

b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ________________________________________________________________

Name_____________________

Date: ________Period________ __________________________________________________________________________________c) What phase change, if any, is taking place? _____________________________________________

3) a)What phase or phases are present during segment (3) _______________________________________

b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ________________________________________________________________ __________________________________________________________________________________c) What phase change, if any, is taking place? _____________________________________________

4) a)What phase or phases are present during segment (4) _______________________________________

b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ________________________________________________________________ __________________________________________________________________________________c) What phase change, if any, is taking place? _____________________________________________

5) a)What phase or phases are present during segment (5) _______________________________________

b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ________________________________________________________________ __________________________________________________________________________________c) What phase change, if any, is taking place? _____________________________________________

 6)     What is the melting point of this substance?  7)     At what temperature would this sample finish boiling?  

Name_____________________

Date: ________Period________8)     When this substance is melting, the temperature of the ice-water mixture remains constant because:a.     Heat is not being absorbedb.     The ice is colder that the waterc.     Heat energy is being converted to potential energyd.     Heat energy is being converted to kinetic energy 9)     When a given quantity of water is heated at a constant rate, the phase change from liquid to gas takes longer than the phase change from solid to liquid becausea.     The heat of vaporization is greater than the heat of fusionb.     The heat of fusion is greater than the heat of vaporizationc.     The average kinetic energy of the molecules is greater in steam than in waterd.     Ice absorbs energy more rapidly than water does

Use dimensional analysis to set up and solve:The heat of fusion for water (Hf) is 80 calories/gram and the heat of vaporization (Hv) for water is 540 calories/gram.

10) a) How much energy would be required to melt 500 grams of ice at 0oC to water at 0oC?

b) How much energy would be required to convert 2 moles of water at 100oC to water vapor at 100oC?

Name_____________________

Date: ________Period________Heating Curve Worksheet (ver 2) Name: ANSWERS

1) a)What phase or phases are present during segment (1) _________SOLID_________________________

b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) _____The K.E. of vibration is increasing________________ __________________________________________________________________________________c) What phase change, if any, is taking place? _____NONE (perhaps sublimation)_______

2) a)What phase or phases are present during segment (2) _____SOLID & LIQUID__________________

b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ______The energy is causing the position of the atoms to change (P.E. is increasing) there is a phase change_________________________________________________c) What phase change, if any, is taking place? __________MELTING___________________________

3) a)What phase or phases are present during segment (3) ________LIQUID________________________

b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) _______The K.E. is increasing (the particles move faster; temperature increases__________________________________________________________________________c) What phase change, if any, is taking place? _______NONE (perhaps some evaporation)________

4) a)What phase or phases are present during segment (4) ________LIQUID & GAS_________________

b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) _______The P.E. increases as the particles move Far, far apart_____________ __________________________________________________________________________________c) What phase change, if any, is taking place? _____Boiling________________________________________

5) a)What phase or phases are present during segment (5) ____________GAS______________________

Name_____________________

Date: ________Period________b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) _______The K.E. of the gas is increasing____________________ __________________________________________________________________________________c) What phase change, if any, is taking place? _________None______________________________

 6)     What is the melting point of this substance? 0 o C  7)     At what temperature would this sample finish boiling? 100 o C  8)     When this substance is melting, the temperature of the ice-water mixture remains constant because:a.     Heat is not being absorbedb.     The ice is colder that the waterc.     Heat energy is being converted to potential energyd.     Heat energy is being converted to kinetic energy

9)     When a given quantity of water is heated at a constant rate, the phase change from liquid to gas takes longer than the phase change from solid to liquid becausea.     The heat of vaporization is greater than the heat of fusionb.     The heat of fusion is greater than the heat of vaporizationc.     The average kinetic energy of the molecules is greater in steam than in water (this is true but not the reason the it takes more energy to change from liquid to gas; changing from liquid to gas there is a bigger distance created between molecules than when a substance changes from a solid to a liquid)d.     Ice absorbs energy more rapidly than water does

(9th grade students will not be expected to do these calculations on the quiz Thursday 2/16/17)The heat of fusion for water (Hf) is 80 calories/gram and the heat of vaporization (Hv) for water is 540 calories/gram.

10) a) How much energy would be required to melt 500 grams of ice at 0oC to water at 0oC?

500g ( 80 calories/g) = 40 000 calories

b) How much energy would be required to convert 2 moles of water at 100oC to water vapor at 100oC?

2 mol H2O (18 g H2O / mol H2O) (540 calories/g H2O) = 19440 calories or 19.44 kcal.

Useful animations:

Lots of info on screen

Name_____________________

Date: ________Period________http://dli.taft.cc.ca.us/streams/Geography/Animations/WaterPhases.html

good animation simple and easy to see/understand but uses Java and is no longer supported:http://mutuslab.cs.uwindsor.ca/schurko/animations/waterphases/status_water.htm

Yeah, kind of like the one that is no longer supported simple graphics and matches the worksheet:http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks3/science/changing_matter/index.htm