1. Warm-Up 3/18/14 Post-Lab Questions What foods did not catch on fire?
For the foods that did not catch on fire, what happened to them?
Why do you think that is?
Which food had the greatest amount of Cal/g?
How does this compare to your hypothesis?
Was this surprising? Why?

2. Assess errors of Food Calorie Lab. Agenda
Objective
Assess errors of Food Calorie Lab.
Agenda
Class discussion – Error in Lab

3. Food Calorie Lab Debrief
1) Calculate ΔT
2) Use ΔT to calculate heat in joules from
q = cmΔT
Specific heat of water is 4.18 J/g.oC Mass is the volume of water you measured

4. Heat lost by food = Heat gained by water
Soda Can Calorimeter
Heat lost by food = Heat gained by water

5. Calculations Continued
Make another chart with calculated heat (joules) for each food, Calories (Cal), and Calories per gram of food (Cal/g)
4.184 J = 1 cal
1000 cal = 1 Cal

6. Calculate Real Values
Gummy bears Peanuts
Cap’n Crunch Cheetos

7. Calculate Real Values
Chocolate Chips Crackers
Orange

8. |Real – Experimental| x 100
Percent Error
To calculate the percent of error your calculations are from the real value:
|Real – Experimental| x 100
Real

9. Look at the percent error calculations of the different foods.
Homework 3/18/14
Look at the percent error calculations of the different foods.
-Make a list of what could have happened during the lab that would have caused large percentages of error?