Topic+4a

Topic 4a **__ Calories (food energy) __**

Calories (Food Energy) ** Name: Samantha A.

Definition: Food is the second most important way in which energy is taken in through the body during digestion. Food energy is expressed in calories or joules. Resources: [] [] Energy comes from different types of food that are consumed in your diet. Carbohydrates, protein, and fats all give the body energy when consumed. When the body digests these foods, it gives your body the energy that it needs to function. Therefore, food is very important because this how your body gets the energy that it needs.

Example 1: A common example to give perspective on food energy is the amount of energy in a single peanut. That energy is commonly quoted as 5 Calories. If so, it can heat a liter of water 5 degrees Celsius, an impressive amount of energy. Example 2: Another example is that of the energy to run a mile; it is perhaps dismaying to hear that to burn off the energy of a candy bar; you might have to run a few miles! So a real life example is basically any food that you eat. Basically any food that you consume has at least a few calories in it. **Source:** ** [] **
 * //Damian B //**
 * Source:** ** [] **

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A walnut is placed in the apparatus shown in the picture. It is then burned. The heat from the flame is used to heat a volume of water in the can. The temperature of the water is monitored throughout the experiment. Complete the following table containing data from this experiment. Sarah M-

Calories / gram || 5.64 Calories/gram || || || % Error of the experiment || 19.15%  || || || || ||
 * Mass of water || 200 g || || Initial mass of the walnut || 2.65 g ||
 * Specific heat of water || 1.00 cal/g ℃ || || Final mass of the walnut || 1.25 g ||
 * Initial temperature of the water || 22.00 ℃ || || Calories / gram (burned) || 5.56 calories/gram  ||
 * Final temperature of the water || 53.90 ℃ || || Manufacturers
 * Energy Absorbed by the water (__c__alories) || 6380 calories
 * Energy Absorbed by the water (__C__alories) || 6.38 Calories