1. Warm Up 1-20-16 1.What do we use to measure temperature? 2.What is the difference between heat and temperature? 3.True or false: Heat is energy and energy is heat. Explain your answer. Agenda Turn in HW-specific heat WS Notes Unit 6-3 Virtual Lab calorimeter Homework Jan 29- Online HW

2. Answers: 1. Specific heat 2. O Kelvin 3. Endothermic 4. Exothermic 5. 4.18 6. Delta T 7. O o Celcius 8. 0.416 9. 63,536 Joules 10. 7.974 g 11. 0.2 12. 13,794 joules 13. 0.031 Answers: 14. 27, 912 joules 15. 58,050 joules 16. 12.096 grams 17. 15.01818 Celsius 18. Object B, lower specific heat means it requires less heat for temperature to increase

3. Enthalpy Unit 6 - 3

4. Enthalpy Enthalpy – the total quantity of heat in a reaction Changes in enthalpy are measured through indicators (temperature) Represented by ΔH

5. Enthalpy Change The sign of  H indicates the direction of heat transfer. +  H indicates heat is entering the system (endothermic) -  H indicates heat has left the system (exothermic).

6. Enthalpy Change For reactions  H = H (products) – H (reactants). Example: 2H 2 (g) + O 2 (g)  2H 2 O(g)  H = -483.6kJ

7. Molar Heat Capacity The quantity of heat required to raise the temperature of one MOLE of a substance by one degree Celsius or Kelvin

8. Molar Heat Calculation Q = n x ΔT x Cp n = moles Cp = molar heat capacity

9. Example Problem The molar heat capacity of CCl 4 is 130.7 J/mol·C. What is the enthalpy change when 125g of CCl 4 is heated from 10 °C to 32 °C. Convert to mole if given grams

10. Calorimeter An instrument for measuring the heat of a reaction during a chemical process

11. $13,000 – $40,000

12. Specific Heat Lab Q gained by water = Q lost from the metal

13. Assignments Summary Virtual calorimeter lab http://www.wiley.com/college/trefil/047 0118547/vdl/lab_calorimeter/

14. Homeroom1-20-16 -AP classes overview -Reflections and setting goals -Quote of the week

15. Homeroom1-20-16 On a piece of line paper. Answer the following questions in complete sentences. 1.What were the high point(s) and low point(s) of last year? 2.List three things your did successfully in school or outside of school. 3.List several goals you want to achieve this semester