Burning Cheeto Prelab information

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Presentation transcript:

Burning Cheeto Prelab information

Copyright © Cengage Learning. All rights reserved Energy Capacity to do work or to produce heat. The total energy content of the universe is constant. PHET:Energy forms and changes PHET:Energy Skate Park(adv) Different types of energy: https://www.youtube.com/watch?v=k4b3oxO0WqE Charging up vs eating up: https://www.youtube.com/watch?v=TnNixMosUIo Copyright © Cengage Learning. All rights reserved

g = gravitational constant Potential Energy Potential energy – energy due to position or composition: What are the factors that would increase potential energy? PE = mg∆h m = mass, g = gravitational constant ∆h = change in height

How do we measure Potential Energy in food? Calorimetry Energy in food can be ignited to transfer heat to water. Like Potential energy, we can calculate how the water temperature is raised. As we burn food, the water above the burner contain several variables: m × s × ΔT

How do we measure Potential Energy in food? Calorimetry

If were talking about Calorimetry …. The energy needed to raise 1 gram of water by 1 degree Celsius is 4.184 J. This is a weird number so instead we use calorie. calorie = 4.184 J Calorie = 4.184 Kilo Joules (KJ) = 4,184 Joules Phet – Eating and exercise

Joule = Energy What is a Joule? Potential Energy = mg∆h Food energy = m × s × ΔT Both can be measured in a unit of Energy called a Joule. 1 Joule is approximately the energy to push a one kilogram object across a frictionless floor one meter. 10 Joules is approximately the energy needed to lift a one kilogram object 1 meter.

Lab: Determining Calories Goals: Observing what is energy that is being created by our foods Practicing the Scientific Method Conversion of units

Conversions: Appenidix A: Conversions 1 gram = 1000 milligrams 1 ounce = 28 grams 1 pound = 16 ounces = 448 grams 1 kg = 2.2 pounds = 1000 grams 1 teaspoon sugar = 4 grams of sugar 1 tablespoon sugar = 12.5 grams sugar 1000 ml = 1 liter 1 teaspoon = 5 milliliters 3 teaspoons = 1 tablespoon 1 tablespoon = 15 milliliters ¼ cup = 60 milliliters 1 cup = 16 tablespoons 1 gallon = 3.9 liters 1 calorie = 4 Joules 10 Joule = lifting 1 kg up 1 meter 1 Calorie = 1 kcalories = 1000 calories 1 g carbohydrate = 4 Calories 1 g protein = 4 Calories 1 g Fat = 9 Calories