1. What’s the MATTER: Specific Heat of Matter

2. Be Afraid… Be Very Afraid…

3. Matter, Specific Heat of Matter At the conclusion of our time together, you should be able to: 1. Define specific heat 2. Use specific heat to determine energy changes

4. Thermochemistry  Some Definitions: Calorimeter – a device to measure the energy absorbed or released as heat in a chemical or physical change Temperature – measure of the average kinetic energy of the particles in a sample of matter Joule – the SI unit of heat

5. Thermochemistry  Some Definitions: Heat – energy transferred between samples of matter Specific Heat – the amount of energy required to raise the temperature of one gram of a substance by one Celsius degree or one Kelvin 1 Calorie/4.184 Joules – will do the above with water

6. 15 Helpful Hints On The Lab Report from Mr. T’s Vast Lab Experience!!! Hint #9. Teamwork is essential. It allows you to blame someone else.

7. Thermochemistry  Some Definitions: Enthalpy (Heat) of Fusion – amount of energy gained or lost by a system as heat during melting or freezing Enthalpy (Heat) of Vaporization – amount of energy gained or lost by a system as heat during boiling or condensation

8. Calvin’s Definition of a Liquid:

9. Specific Heat Calculations:  q = c p x m x t: q = energy lost or gained c p = specific heat of the substance at a specific pressure m = mass of the sample t = change in temperature (final – initial)

10. Practice Page 12:1  q = c p x m x t: q = 59.912 J c p = x m = 36.359 g t = 152.0 o C 59.912 J = (x)(36.359 g)(152.0 o C) = 0.01084 J/g o C

11. Practice Page 12:2  q = c p x m x t: q = -800. J c p = 0.4210 J/g o C m = 73.174 g t = (x – 102.0 o C) -800. J = 0.4210 J / g o C (73.174 g)(x – 102.0 o C) -800. = 30.81x – 3142 2342 = 30.81x = 76.0 o C

12. Matter, Specific Heat of Matter Let’s see if you can : 1. Define specific heat 2. Use specific heat to determine energy changes

13. Maxine’s Thoughts on Intelligence!!

14. Define Specific Heat Specific Heat – the amount of energy required to raise the temperature of one gram of a substance by one Celsius degree or one Kelvin

15. Confucius Says: If at first you don’t succeed… Skydiving is probably not for you!!!

16. Practice Page 12:3  q = c p x m x t: q = -185.4 J c p = 0.440 J/g o C m = x g t = -1475 o C -185.4 J = (0.440 J/g o C )(x)(-1475 o C) -185.4 J = -649 Jg = 0.286 g

17. Practice Page 12:4  q = c p x m x t: q = x J c p = 0.0335 cal/g o C (4.184 J/cal) m = 152.00 g t = -51.5 o C x = (0.140164 J/g o C )(152.00 g)(-51.5 o C) = -1.10 x 10 3 J

18. Maxine asks: What do you get with a woman who has PMS and a GPS?? A b---- who will find you!!!

19. Have a Great Week!!