Can you continue the multiple choice questions you were writing yesterday? (Pages 14 and 15) Do now!

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Can you continue the multiple choice questions you were writing yesterday? (Pages 14 and 15) Do now!

Last lesson Absorption of food by the blood

Read pages 14 and 15 and write 10 multiple choice questions (each with 4 possible answers) to go with these pages

Today’s lesson Measuring the energy content of food

Energy requirements?

Vary with age, activity levels and pregnancy

Energy content of foods? Burn food Measure temperature rise of a known mass of water Calculate energy released by burning food (using the specific heat capacity of water)

Let’s do it! Measure 10cm 3 of water into a test tube Take temperature of water Weigh the food Set light to food and hold it under the test tube Record final (highest) temperature of water Record your measurements Calculate the energy released = 41.9 x temp rise

Energy in foods Type of snackMass of snack (g) Starting temp (°C) Finish temp (°C) Temp rise (°C) Energy produced (J) (41.9 x temp change) Energy per gram (J/g) (Energy divided by mass) Pork rinds Cheetos Raisins Pasta