Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide...
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Transcript of Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide...
![Page 1: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/1.jpg)
Experiment Questions
Food Tests
![Page 2: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/2.jpg)
Food Tests
For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the
biology laboratory?
Test for protein
![Page 3: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/3.jpg)
Food Tests
For what is the Benedict’s (or Fehling’s) test used in the biology laboratory?
Test for reducing sugar
![Page 4: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/4.jpg)
Food TestsFor what purpose did you use brown paper or
Sudan III in food testing?
To test for Fat / Lipid / Oil
![Page 5: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/5.jpg)
Food Tests
What reagent or chemicals did you use to test for protein?
Biuret OR NaOH and CuSO4
![Page 6: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/6.jpg)
Food Tests
Is heat necessary in the test that you carried out to test for protein?
No
![Page 7: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/7.jpg)
Food Tests
What colour change indicates the presence of protein?
From blue to purple / violet
![Page 8: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/8.jpg)
Food Tests
Name the test or name the chemical used to test a solution for the presence of glucose
(reducing sugar).
Clinistix / Benedicts / Fehling’s / Copper
sulphate
![Page 9: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/9.jpg)
Food Tests
What colour change indicates a positive result for the presence of glucose?
(Clinistix) Orange to Blue or (others) Blue to Red
![Page 10: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/10.jpg)
Food Tests
Is heat necessary to test a solution for the presence of reducing sugar?
Yes
![Page 11: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/11.jpg)
Food Tests
For which purpose did you use Biuret solution or alkaline copper sulphate in food testing?
To test for (soluble) protein
![Page 12: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/12.jpg)
Food Tests
State a use for the Biuret test in the biology laboratory.
To detect presence of protein
![Page 13: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/13.jpg)
Food Tests
What is the initial colour of the reagent or chemicals used to test for protein?
Blue
![Page 14: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/14.jpg)
Food Tests
Was there a colour change in the control experiment when testing for protein?
No
![Page 15: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/15.jpg)
Food Tests
Name the test or give the chemicals used to test a sports drink for the presence of protein.
Biuret Test / Sodium Hydroxide & Copper sulphate
![Page 16: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/16.jpg)
Food Tests
If protein is present in a drink, what colour change would you expect to see? In your
answer give the initial and final colour of the test solution.
Blue to violet /purple / lilac
![Page 17: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/17.jpg)
Food Tests
Is heat necessary for the test for protein?
No
![Page 18: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/18.jpg)
Food Tests
For what purpose did you use Fehling’s solution or Benedict’s solution in the course of your
practical activities?
To check for Glucose / reducing sugar
![Page 19: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/19.jpg)
Food Tests
For which purpose did you use Brown paper or Sudan III in food testing?
To test for fat (or lipid or oil)
![Page 20: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/20.jpg)
Food Tests—Reducing sugar
(i) Name the reagent(s) used.(ii) State the initial colour of the reagent.
(i) Benedict’s/ Fehlings I and II, (ii) Blue
![Page 21: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/21.jpg)
Food Tests—Reducing sugar
State whether the test requires heat.
Yes
![Page 22: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/22.jpg)
Food Tests—Reducing sugar
What colour indicates a positive result?
Brick-red/orange
![Page 23: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/23.jpg)
Food Tests—Protein
(i) Name the reagent(s) used.(ii) State the initial colour of the reagent.
(i) Biuret solution / CuSO4 + NaOH (ii) Blue/ light blue
![Page 24: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/24.jpg)
Food Tests—Protein
State whether the test requires heat.
No
![Page 25: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/25.jpg)
Food Tests—Protein
What colour indicates a positive result?
Purple / violet
![Page 26: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/26.jpg)
Food Tests
(i) Name a test to show the presence of a reducing sugar (e.g. glucose).
(ii) Describe how you would carry out this test.
(i) Benedict’s/ Fehling’s (ii) Dissolve sample in water or put in test
tube / add reagent / heat / don’t boil / observe change or state result (brick-red-
orange precipitate)
![Page 27: Experiment Questions Food Tests. For what is the Biuret test (copper sulphate and sodium hydroxide solutions) used in the biology laboratory? Test for.](https://reader035.fdocuments.us/reader035/viewer/2022062504/5a4d1b6b7f8b9ab0599b3147/html5/thumbnails/27.jpg)
Food Tests
(i) Name a test for protein.(ii) Describe how you would carry out this test.
(i) Biuret test or named chemicals (ii) Add biuret reagent (or sodium hydroxide
and copper sulfate) / to sample / heat or shake / observe or record colour change
(purple-violet)