Food Energy Lab

Heading:

Name, Partner, Date, Period, Nutrition Science

Introduction

• When we eat food our bodies burn the food to use the energy that is released when they are broken down.

• Does each piece of food contain the same amount of energy?

• WRITE YOUR OWN INTRODUCTION

• INCLUDE THE DEFINITION OF A CALORIE

Purpose:

• To determine the amount of energy contained in specific foods.

• To determine if each piece of food contains the same amount of energy.

• To determine the accuracy of a calorimeter in measuring kcals.

Materials

• Frosted cheerio

• Mini marshmallows

• Cheese cracker

• Forceps

• Electronic balance

• Needle and cork

• Ceramic square

• Graduated cylinder

• Ring stand

• Clamps

• Tap water

• Thermometer

• Test tube

• Test tube rack

• Test tube holder

• Lighter

• Calorimeter

• Lab Quest/Vernier probe

• Tin can

Procedure

1. gather 3 pieces of each item2. weigh each one individually write it down3. make your observations-before4. put the item on the needle and cork or use forceps with

the cheese cracker5. measure out 10ml of water and pour it into your test tube6. take the temperature of the water7. hold the test tube over the food 8. light the food and make observations 9. take the temperature when the food is done

burning.

Calorimeter Open Air Burn

Data Table #1 Qualitative Observations

Before burning

During burning

After burning

Cracker

Cheerio

Marshmallow

Extra Credit

Data Table #2experimental data

Food Trial # Weight T1 T2 ΔT

Cheerio 1

Cheerio 2

Cheerio 3

Data Table #3 - Averages #1 Average ΔT

#2 Average weight

Volume of

water used

#3 calories ΔT x V

#4 calories/gram

#5 Kcal/g (data)

#6 Kcal/g (label)

CheerioCalor-imeter

CheerioOpen air

Cheez-itCalor-imeter

Cheez-itOpen air

Marsh-mallowCalor-imeter

MarshmallowOpen air

#1. calculate the average change in temperature of each food.

#1 Average ΔT

#2 Average weight

Volume of

water used

#3 calories ΔT x V

#4 calories/gram

#5 Kcal/g (data)

#6 Kcal/g (label)

Cheerio

Marshmallow

Cheez-it

#2. calculate the average weight for each food

#1 Average ΔT

#2 Average weight

Volume of

water used

#3 calories ΔT x V

#4 calories/gram

#5 Kcal/g (data)

#6 Kcal/g (label)

Cheerio

Marshmallow

Cheez-it

Record the volume of water used

#1 Average ΔT

#2 Average weight

Volume of

water used

#3 calories ΔT x V

#4 calories/gram

#5 Kcal/g (data)

#6 Kcal/g (label)

Cheerio

Marshmallow

Cheez-it

#3. calculate ΔTxV=calories, using the average temperature change (#1)

#1 Average ΔT

#2 Average weight

Volume of

water used

#3 calories ΔT x V

#4 calories/gram

#5 Kcal/g (data)

#6 Kcal/g (label)

Cheerio

Marshmallow

Cheez-it

#4. calculate the amount of calories in 1 gram using the formula

#1 Average ΔT

#2 Average weight

Volume of

water used

#3 calories ΔT x V

#4 calories/gram

#5 Kcal/g (data)

#6 Kcal/g (label)

Cheerio

Marshmallow

Cheez-it

#calories = x = calories/g# grams 1 gram

#2 #3

#5. Convert answers in column #4 from calories to Calories (kcals)

#1 Average

ΔT

#2 Average weight

Volume of water

used

#3 calories ΔT x V

#4 calories/

gram

#5 Kcal/g (data)

#6 Kcal/g (label)

Cheerio

Marshmallow

Cheez-it

calories/1,000 = kcals

#6. compare “actual” or nutritional label info to “experimental” (#5)

#1 Average

ΔT

#2 Average weight

Volume of water

used

#3 calories ΔT x V

#4 calories/

gram

#5 Kcal/g (data)

#6 Kcal/g (label)

Cheerio

Marshmallow

Cheez-it

Food label

Kcals/serving = x grams/serving 1g

30 grams

Analysisin notebook

• Answer the questions on the back of your lab in either complete sentences or question and answer format.

Conclusion in notebook

• Answer the conclusion using information from your notes, class discussion and lab.

• Discuss calorimeter results as compared to standards and cork & pin

Links - Calorimeter

• Bill Nye – Nutrition, episode 62

• http://www.gamequarium.org/cgi-bin/search/linfo.cgi?id=8448

• Calorimeter experiment –

• http://www.youtube.com/watch?v=Ip8Nppmm11k

• Bomb Calorimeter

• http://www.youtube.com/watch?v=ohyA9amFfsc&feature=related