1. Q = MCΔT – Specific Heat & CALORIMETRY
Burnin’ Up

2. What is heat?
Thermal energy (kinetic) produced by the movement of molecules

3. Why might we want to measure heat?

4. We’re going camping… How might I decide?
I can only take 1L of gas. Should I take
PROPANE GAS?
or BUTANE GAS?
How might I decide?

5. How about another example…

6. How many calories are in our food?

7. What are ‘calories’ in food?
How much ‘energy’ you will gain if you eat it
How much heat will be produced if we burn it

8. How do we determine the caloric content of food?
BURN IT!!!
Nowadays they use more sophisticated methods to determine the components
Proteins 4 cal/g
Carbohydrates 4 cal/g
Fats 9 cal/g

9. It’s Experiment Time! VS

10. Comparing it CHEETOS CHIPS 550cal for 95 grams = 5.78cal/gram
x 4.184KJ/cal
= KJ/gram
390cal for 75 grams
= 5.2cal/gram
x 4.184KJ/cal
=21.76kJ/gram

11. We’ve been talking about Q=MC(delta)T
What is Calorimetry?
the technological process of measuring energy changes in a chemical system
What is a Calorimeter?
A device used to measure the energy change of a chemical system
Used to insulate the reaction against energy/product loss

12. Examples of Calorimeters

13. Bomb Calorimeter
Often used for combustion reactions (not necessarily for ‘bombs’!)

14. Calorimetry Questions

15. Question 1: Together
It takes 41.8J to heat a kg chunk of gold from 10oC to 27oC. Calculate the specific heat capacity of gold.

16. Steps we followed 7. Sub in the numbers 8. Do the math – WITH UNITS!
Six Steps of Preparation
What do we need to find?
What numbers do we have?
What ‘hidden numbers’ do we have?
What equation(s) can we use?
Do we need to rearrange the equation?
Do we need to convert any units?
Four Steps of Action
7. Sub in the numbers
8. Do the math
– WITH UNITS!
-- WITH SIGNS! (+/-)
9. Round the answer to the appropriate significant digits
10. Check your answer: Does it make sense?
Does it answer the question that was being asked?

17. Question 2: On your own
On a mountaineering expedition, a climber heats water from 0oC to 50oC. Calculate the mass of water that could be warmed by the addition of 8.00kJ of heat.

18. Let’s take it one step further
I took a 0.400kg block of Aluminum, and heated it on a hot plate to 212oC. I then transferred it to 0.800L of water at 23.0oC. The final temperature of the system was 41.35oC. What is the specific heat capacity of aluminum?

20. Homework Finish pre-lab for NEXT CLASS (Friday)
No pre-lab = no lab
Calorimetry worksheet is due on TUESDAY
Look over ‘cheat sheet’ – it may help you understand the worksheet