How does your body get energy to do what you want to do?

What kind of energy do we get

from these resources? How?

Burning releases energyBurning releases energy

Do these

contain

energy?

Whoa!

That’s a lot of energy!

•Well, is there energy in the snack?

•How do you know? What evidence do you have?

How can we

measure how much

heat energy is released by one

Cheeto?

Form an aluminum cup by CAREFULLY

molding the aluminum-foil

square around the vial

Squeeze the ring and

insert the ends into the binder clip.

Slide the ring over the dowel.

Open the clip and clamp it on the dowel about 10 cm above the

base

Put the “cup” in the holder and place the bottom of the

cup about 1.5-2 cm

above the Cheeto

Pour 20 mL of water into your “cup” and record the starting temperature

GOGGLEGOGGLE UPUP and let’s begin!

Record the temperature of the water

after the Cheeto stops

burning.

N o g o g gl e s ,

N o g l o w!

• What evidence do we have that food has energy?

• Why do people eat food?

• Is water food?• Where do people get

energy besides food?• What units do people

use to measure the energy in food?

Calories• Unit used to measure

heat• One calorie is the

amount of heat needed to raise the temperature of 1 mL of water 1 º C

How many calories of

heat did your burning Cheeto

transfer to your water?

Calorie Calculations

• To determine calories, multiply the change in temperature (T) by the volume of water (V) used

T x V = caloriesT = 58ºC - 12 ºC = 46 ºC • Calories = 46 ºC x 20 mL = 920 calories

Reflection page 40

Is water food?Creatively convince

your audience of your answer.