Chemistry grd 12

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for the below questions the food samples were onion juice, cornflakes, egg, milk, salad dressing and instant oatmeal.

1) Why are you required to wear safety eye wear and protective clothing while conducting an investigation of testing food samples for proteins,starch,sugar and fat?

2) Why must the test tubes be thoroughly cleaned and dried when one part of the procedure is completed before starting the next part of the procedure for testing food samples for proteins, starch, sugar and fat?

3) Why would distilled water be tested during a investigation for testing food samples for proteins, starch, sugar and fat?

4) Describe any limitations to the usefulness of these tests for food samples.


Thankyou very much for your help:)

  • Chemistry grd 12 -

    Most of these have obvious answers I think. Let me know if that isn't true.

    1) Why are you required to wear safety eye wear and protective clothing while conducting an investigation of testing food samples for proteins,starch,sugar and fat?
    You should be required to take safety precautions anytime you're working in the lab.

    2) Why must the test tubes be thoroughly cleaned and dried when one part of the procedure is completed before starting the next part of the procedure for testing food samples for proteins, starch, sugar and fat?
    You don't want to contaminate one test with the left overs of the others

    3) Why would distilled water be tested during a investigation for testing food samples for proteins, starch, sugar and fat?
    You want to make sure the H2O you're using is free of any of the test substances.

    4) Describe any limitations to the usefulness of these tests for food samples.
    I can't answer this since I don't know what tests you performed.

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