Download Activity 63: Measuring Calories

Activity 63: Measuring Calories

Warm up: What would be the energy released
when melting an ice cube if you had a 30°C
temperature change in 70 mL of water?
Quiz

There will be a quiz on the last 3 activities in this
unit (Activities 61-63) on Wednesday.

Please remember to study and make a
notecard!
Unit D Test and Project

Next class we are reviewing for the test and
working on our project.
◦ Bring any materials you would need to work on the
project!

Your test is on Friday and the project is due next
Tuesday.
Unit D Missing Work

If you have any missing work from Unit D, it
needs to be in by the date of the test, no
exceptions.

Any “M” in NetClassroom will remain an “M”
after you take the test!
Activity 62 Analysis Questions
Activity 62 In Case You Missed It

Thermal energy always moves from hot to cold,
causing changes in temperatures of both the
hotter object and cooler object.

Thermal energy use can be quantified by using
the formula:
Luminol Light Demo

Where did the light energy come from?

How is this different than the melting ice activity
in Act. 62?

How can we release the energy in a Cheeto?
Activity 63: Measuring Calories

Please open your books to page D53.
Units of Energy

Joule (J)- the SI (International System of Units)
unit of energy measurement.
◦ One joule is the amount of energy required to exert
a 1-newton force over a distance of 1 meter.
Units of Energy

Energy has many units of measurement, and
another one of them is the calorie (cal).

One calorie is the amount of heat energy
required to raise 1 gram of water 1°C.
◦ One calorie is the water’s specific heat capacity.
◦ So what is the definition of specific heat capacity?

One calorie is equal to 4.2 joules.
Units of Energy

The calorie, more so than the joule, is easily
measured using water and is simple to
calculate.
◦ This formula is for the specific heat capacity of water.
◦ For example, it takes 2 calories to increase the
temperature of 2 grams of water 1°C or to heat 1
gram of water 2°C
Units of Energy

The nutritional Calorie (C) is a unit commonly
used when measuring the amount of potential
heat energy contained in a food.
◦ One Calorie =1,000 calories =1 kilocalorie (kcal)
◦ It is easier to write that a can of pop has 150 Calories
compared to 150,000 calories.
Activity 63: Measuring Calories

Using a calorimeter, we can measure how
many Calories are in a Cheeto.

Knowing the formula for specific heat capacity:
how do you think we will figure out the amount of
Calories are in a Cheeto?
Activity 63: Measuring Calories

Each lab table has a calorimeter at it. This has:
◦
◦
◦
◦
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A hanger
Aluminum foil
A pop can
A thermometer
A fuel (Cheeto) stand
Activity 63: Measuring Calories

From the nutrition facts, we know that one
Cheeto has about 7 Calories.

What can account for the lower value of your
result?
Tonight’s homework

Analysis questions #1-3 and #6.

Study and prepare notecard for the quiz on
Wednesday.