Monday, Apr. 27 th p. 262, 263. Monday, Apr. 27 th 262 4/27/15 Mon. L.T.: I can prep for my lab by engaging in the question, making a hypothesis, and.

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Presentation transcript:

Monday, Apr. 27 th p. 262, 263

Monday, Apr. 27 th 262 4/27/15 Mon. L.T.: I can prep for my lab by engaging in the question, making a hypothesis, and understanding how the procedure will yield data that answers our question. DO NOW: You are on a deserted island (no boss this time) and need to choose 1 food item for the week you are there. You get 1,000 grams of whichever food you choose. Which of the following would you choose and why? 1) Cheetos 2) animal crackers 3) peanuts 4) marshmallows 5) potato chips …………………………….. Reflection: Why does burning a food item and measuring the change in the water temperature tell us how much energy is in a food? 263 Title: Survival Food Q: Which of the following would transfer the most amount of energy when I eat it? Hyp: If……. Then…… because……. Procedure: CV: MV: RV: Pre-Lab Notes:

DO NOW Cheetos Animal crackers Peanuts Marshmallows Potato chips

Hypothesis Q: Which of the following would transfer the most amount of energy when I eat it? If I burn peanuts (meeting), - (Exc: rank all 5 in order) Then it will change the _______________ the most, Because ____________________________. If (MV), Then (RV), Because (scientific reason).

Video clip MdYIY

Based on what you saw from the video clip, what are some things we will need to change in order to find out which food quantifiably has the most calories? Safety: CVs: mass out the food items so they’re all the same mass MV: we have 5 dif foods we’re going to test RVs: Set-up: no liquid oxygen

Pre-Lab notes What is a calorie? How much energy is one calorie? 1 cal = the amount of energy needed to raise 1 mL of water 1 degree Celcius ___ mL water x ___ temp change = ___ cal How does burning food show us how much energy (calories) are in it?

Our Lab (under Pre-Lab Notes) Take the lab sheet handed to you and discuss and record with your partner: What is calorimetry? – measuring changes in heat produced by a change of state in an object How is our lab different than the one shown on the video clip? How are we measuring how many calories are in the food? How does measuring the before and after temperature of the water above the burning food show us how much calories are in the food? What are some safety issues we may have? What does our lab set up look like?

Procedure CV (there should be many): MV: RV: Logical Steps: …. And so on. Materials: 50 mL water Glass beaker Ring stand Wire mesh Thermometer Mass scale Lighter Goggles