1. 4/29/2013 and 4/30/2013 Standards: 7 (Chemical Thermodynamics) Objectives: ● Students will be able to calculate 2 problem types: a. specific heat problems b. heats of vaporization or fusion DO NOW: 1. Given: 3.70 J and ΔT -21 ---> -41 Find: mass of water 2. Given: 2.25 mol methanol Find: kJ required to vaporize if at -33.3 °C (bp of methanol) HOMEWORK: 1. None =========================================================== BASKET: ● Journal 4/26 (What you learned, or relearned about specific heat calcs and heats of vaporization and fusion) Please check to see if you accidently put a "W" eraser in your backpack. =========================================================== (for heat of vaporizaiton)

2. Specific Heat J/g°C Given Find J g°C Heat of fusion kJ/mol Given Find kJ mol Given Find Heat of Vap kJ/mol Who goes with What? slopes flat lands 4.18J g °C 6.02 kJ mol 40.6 kJ mol Make up problems for all 3 boxes above and work out in the box provided above. J g °C slopes flat lands kJ mol flat lands kJ mol

3. find 39.5 J 148 J 2.05 J find Specific heat - practice problems 2.5 kg find 725 g find 82 g 0°C ---> 32°C 100°C ---> 145°C find -82°C ---> -5°C 74°C ---> 30°C Q# J mass ΔT 1234512345 Pract. Probs. Ch 16.3 - Thermochem. Eqns. Heat of Vaporization/Fusion - practice problems 5.5 find 1.7 find 22.5 83.1 find 2.6 water ammonia (NH 3 ) methanol ethanol NH 3 Q#molkJ substance 6 7 8 9 10 Name:_______________ Date:_______ Period:__ Direct ions: Sh ow calcs! Answer questio ns next to each line, or number 1-10 on back and show calcs there with note on front to look at the back. This page was use to make: http://mrwiggersci.com/chem/homework/Ch-16-3-PPs-sp-ht-vap-fusion.htm

4. 1. Given: 3.70 J and ΔT -21 ---> -41 deg C Find: mass of water 0.0925 g H 2 O 2.0J g°C sp ht H 2 O solid

5. 2. Given: 2.25 mol methanol Find: kJ required to vaporize if at -33.3 °C (bp of methanol)

6. Specific Heat & Heats of Fusion & Vap Grade: «grade» Subject: «subject» Date: «date»

7. 1For specific heat problems, if you are given mass and J (joules), what will the find be? A ΔTΔT B mol C J D g

8. 2For specific heat problems, if you are given mass and ΔT, what will the find be? A ΔTΔT B J C g D mol

9. 3For Specific Heat problems, if you are asked to find ΔT what information must you be given to be able to solve the problem? (there may be more than one correct answer, choose all that apply, or none) A J B ΔTΔT C g D mol E all of these are needed F none of these are needed

10. 4For heat of vaporization problems, if you are given grams of He, what will you need to do to solve the problem? Ause specific heat and solve for kJ Bchange grams to moles and use heat of fusion to solve the problem Cchange grams to moles and use heat of vaporization to solve the problem Dyou cannot solve this problem

11. 5/1/2013 Standards: 7 (Chemical Thermodynamics) Objectives: ● Students will be able to calculate 2 problem types: a. specific heat problems b. heats of vaporization or fusion DO NOW: 1. Classwork working problems from SmartBoard HOMEWORK: 1. Ch 16.2 p. 498 #12 & 13; Ch 16.3 p. 504 20, 21, 22 (5 pts) Std 7 (students will grade each others homework tomorrow) =========================================================== ● Journal 4/30 (What you learned, or relearned about specific heat calcs and heats of vaporization and fusion)

12. TRY Always look for what you did wrong first, be the leader! Choose wisely! Wife blows up at husband coming home after work 10 mi n make trying a habit marriage must be forever sex hap py wife hap py life

13. Specific Heat J/g°C Given Find J g°C Heat of fusion kJ/mol Given Find kJ mol Given Find Heat of Vap kJ/mol Who goes with What? slopes flat lands 4.18 J g °C 6.02 kJ mol 40.6 kJ mol Make up problems for all 3 boxes above and work out in the box provided above. J g °C slopes kJ mol flat lands kJ mol flat lands / 40.6kJ mol

14. Specific Heat & Heats of Fusion & Vap Grade: «grade» Subject: «subject» Date: «date»

15. 1For specific heat problems, if you are given mass and J (joules), what will the find be? A ΔTΔT B mol C J D g

16. 2For specific heat problems, if you are given mass and ΔT, what will the find be? A ΔTΔT B J C g D mol

17. 3For Specific Heat problems, if you are asked to find ΔT what information must you be given to be able to solve the problem? (there may be more than one correct answer, choose all that apply, or none) A J B ΔTΔT C g D mol E all of these are needed F none of these are needed

18. 4For heat of vaporization problems, if you are given grams of He, what will you need to do to solve the problem? Ause specific heat and solve for kJ Bchange grams to moles and use heat of fusion to solve the problem Cchange grams to moles and use heat of vaporization to solve the problem Dyou cannot solve this problem

19. vaporization fusion Q# J mass ΔT Q#molkJ substance 2.50 find 44.0 water ammonia (NH 3 3434 1212 find 25.0 J 4.5 kg find 0°C ---> 22°C -60°C ---> -25°C (Chart p. 502) Both are H 2 O Group practice - work in groups of 4. Copy the questions as given & find, and work out the answers using a series of fractions. 1. 414,000 J3. 102 kJ 2. 0.356g4. 7.8 mol ANSWERS

25. 5/2/2013 Standards: 7 (Chemical Thermodynamics) Objectives: ● Students will be able to calculate 2 problem types: a. specific heat problems b. heats of vaporization or fusion DO NOW: 1. When HW papers returned, trade papers for grading. HOMEWORK: 1. Zum Heating Curve Questions 13-17 (bottom right) (5 pts) Std 7 2. Help Sheet for Mini Quiz Ch 16.1-16.3 (5pts) Std 7 =========================================================== BASKET: ● Journal 5/1 (What you learned, or relearned about specific heat calcs and heats of vaporization and fusion) 1. Ch 16.2 p. 498 Ch 16.3 #12 & 13; p. 504 20, 21, 22 (5 pts) Std 7 (students will grade each others homework tomorrow)5

26. Announcement q uiz on a. specific heat problems b. heats of vaporization or fusion Tomorrow, Friday (5/3)

27. 13. heat of vaporization heat of fusion vaporization = 22 x fusion for substance X Homework answers for Th 5/2 14.melt 10.0 g of X = 0.48 kJ vap 27 10.0 g of X = 27 kJ 15. 848 J melts 11.5 g H 2 O 3,020 J vaporizes 11.5 g H 2 O 16.fuse 25.og H 2 O = 8.37 kJ vap 37.5g H 2 O = 84.4 kJ warm H 2 O 55.2g 0 ---> 100°C 23.1 kJ 17.cool 10.0g H 2 O from 200°C ---> 100°C = 2.03 kJ condense 10.0g H 2 O = 22.50 kJ cool 10.0g H 2 O from 100°C ------> 0°C = 4.18 kJ freeze 10.0g H 2 O = 3.34 kJ cool 10.0g H 2 O from 0°C ------> -5.0°C = 1.03 kJ ------------- total energy removed from 10 g H 2 O going from 200°C --- > -5.0°C 32.08 kJ

28. 5/3/2013 Standards: 7 (Chemical Thermodynamics) Objectives: ● Check for understanding of: a. specific heat problems b. heats of vaporization or fusion DO NOW: 1. Prep. for Ch 16 Mini Quiz Ch 16.1, 16.2, 16.3 - polish your Help Sheet HOMEWORK: NONE =========================================================== BASKET: ● Journal 5/2 (What you learned, or relearned about specific heat calcs and heats of vaporization and fusion) 1. Zum Heating Curve Questions 13-17 (bottom right) (5 pts) Std 7

30. For this period only, if you didn't do the homework last night, or didn't complete it, you may redo and turn in on Mon for full credit.

31. Put papers into 5 stacks Help Sheets scratch The following in order with smallest # on top: quizzes scantron charts Spread so #'s show

32. ΔH = - 50kJ °C α Δ ♂ ♀ β ↑↓ Ω