Make up Calorimetry Lab … get the lab tables & question packet from your teacher first

Make up Calorimetry

Lab

… get the lab tables & question packet from your teacher first.

Purpose:

• The purpose of this lab is to learn how the number of calories are calculated using foods.

Background Information

• The unit of heat measurement is called a calorie

• calorie = the amount of energy to heat 1 gram of water 1 ˚C

• Calorie = 1000 calories / 1 kilocalorie /(Food calorie)

• The equation used to calculate this is….

calorie = mwater C ∆ T

m = mass water

C = specific heat of water

T = temperature in ˚C

Procedures

• Collect all of your materials at your desk.

• Mass each of your three foods and record your data in the table 1.

• Set up your equipment shown in the pictures.

• Measure 100 mL of water and pour it into the soda can.

• Measure the temperature and record in table 1.

• Light your food on fire and allow to burn completely…… if it goes out then relight until it is burned.

• When it goes out record the temperature of the water now and every 30 seconds for the next 2 minutes.

• Mass what is left of your burnt food item. Record the mass in your table.

Using the table below, calculate the ∆T and change in mass. Record your information on the

table in the lab.

Using the equation:calorie = m C ∆T calculate and complete the

following table in your lab writeup.

Using the “given” caloric values for each food used calculate the percent error for each food.

• Use the equation:% error = given value – calculated value

______________________ X 100

given value

Graph the average kcals/g side-by-side with the “given” values for each food. Use the following set

up for your graph.

Title – Figure 1: Average kcals/g for foods

X axis – food types

Y axis – average kcals / g

• Complete the questions for the lab and hand the completed lab into your teacher.