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? Activity 63: Measuring Calories.

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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? Activity 63: Measuring Calories

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! Quiz

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 Test and Project

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! Unit D Missing Work

Activity 62 Analysis Questions

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: Activity 62 In Case You Missed It

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? Luminol Light Demo

Please open your books to page D53. Activity 63: Measuring Calories

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. Units of Energy

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: ◦ 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? Activity 63: Measuring Calories

Analysis questions #1-3 and #6. Study and prepare notecard for the quiz on Wednesday. Tonight’s homework

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