Thursday, 3 January 2013

2.7 describe the tests for glucose and starch

Test for glucose
Heat object with Benedict’s or Fehling’s Reagent.
if it turns from blue to orange then glucose is present.

 The starch test
Apply iodine to the object you are testing,
if it turns from red to blue/black then there is starch.
Note: in an exam you are safest saying blue/black instead of blue or black.
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9 comments:

  1. Unknown29 March 2015 at 09:59

    does the test for starch have to be under heat?

    ReplyDelete
  2. Unknown29 March 2015 at 10:00

    does the test for starch have to be under heat?

    ReplyDelete
  3. Unknown2 April 2015 at 06:15

    No

    ReplyDelete
  4. Unknown31 May 2015 at 11:17

    this was really useful

    ReplyDelete
  5. Unknown31 May 2016 at 02:44

    Is the "object" to be heated just any food item?

    ReplyDelete
  6. Unknown1 June 2016 at 09:19

    Or a leaf or what ever you are testing

    ReplyDelete
  7. Unknown1 June 2016 at 09:19

    Or a leaf or what ever you are testing

    ReplyDelete
  8. Mike Tsang26 June 2017 at 02:35

    The Biology Syllabus has changed.... New Syllabus Blog:

    http://igcse-biology-2017.blogspot.hk

    ReplyDelete
  9. SophieRice26 June 2017 at 07:29

    More at

    http://igcse-biology-notes.blogspot.hk/2017/06/27-describe-test-for-glucose-and-starch.html

    ReplyDelete

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