nelson harris dyo #1

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  • 8/8/2019 Nelson Harris DYO #1

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    Nelson Harris

    11/8/10

    Background: Fats come from different places like food and

    liquid. There are two kinds of fat. Saturated fat which isunhealthy an found in animals, and unsaturated fat which

    is healthy and found in plants. The percent of fat in a food

    is the amount of fat in the food.

    Purpose: Were trying to find out the fat in McDonalds

    hashbrowns.

    Materials: Acetone, McDonalds hashbrown, Stirrer,beaker, petri dish, and graduated cylinder.

    Procedure:

    1. Weigh beaker. Add 5 grams of food to the beaker.

    2. Record weight of beaker with food in it.

    3. Add 20 mililiters of acetone to the food in the beaker.

    4. Stir until well mixed for a minute. Then settle for a

    minute.

    5. Pour only acetone into the petri dish.

    6. Add another 10 milliliters of acetone to the food and

    repeat steps 4 and 5.

    7. Place the petri dish with acetone and beaker with food

    in a well vented area.

    8. Allow the acetone in the petri dish to dry overnight in awell ventilated area so you can see the extracted fat.

    9. Allow beaker with the food to dry overnight.

    10. Weigh beaker with food (Record in data table).

    11. Clean beaker and food.

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    12. Calculate weight difference and record it in the data

    table. The weight difference is the amount of fat that was

    extracted from the sample.

    13. Observe and record the appearance of the fats.Data:

    Food

    Type

    Weight of

    beaker

    Weight of

    beaker

    Total # of

    grams

    Percent of

    fat

    McDonald

    hashbrow

    n

    168.5 173.5 5 grams 5 percent

    Scientific Prediction Reasoning: I predict theres more than

    50 percent of fat in the foods because of the fact that I

    know all of them are unhealthy.

    Class

    Data

    Food Percent of fat

    Butter Bagel 12 percent

    Biscotti 22.6 percent

    Conclusion:

    In the DYO lab that ive recently did, i extracted fat from a

    McDonald hashbrown. The data that i found was that the

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    hashbrown weighed 168.5 grams with the beaker before

    we extracted the fat. But after the fat was extracted the

    weight plus beaker surprisingly the weight increased to

    173.5 grams. My prediction of how much percent of fat inthe hashbrown was wrong because i predicted that there'd

    be 50% or more fat in it when it only has 5% of fat. The

    difference between a saturated fat and an unsaturated fat

    is that saturated fat is unhealthy and from animals.

    Unsaturated fat is healthy and from vegetables. The data i

    found didnt make sense to me at all because we extractedthe fat from the hashbrown and instead of it getting lighter

    in weight, it got heavier. The result that was most

    surprising to me was the extracted hashbrown being

    heavier than the unextracted one. To make sure my datas

    correct id have to do this test about 1 or 2 more times.