GCSE Biology - Food Tests Practicals #16

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Everything you need to know about the food tests GCSE practical. We cover the:
- Benedicts Test
- Iodine Test
- Biuret Test
- Sudan III Test
- Emulsion test (edexcel only)

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Amadeus & Tom

Cognitoedu

A way to remember food tests
Benedict - drinks tea with sugar
Sudan III - lipids has 3 lines
Biuret - b upside down is p for proteins
The one left is iodine for starch 👍💪

ruby-mae

1:04 Benedict's test
2:09 Iodine test
2:45 Biuret test
3:23 Sudan III test
3:53 Emulsion test

for anyone who needs this:)

chloevanderwesthuizen

Post-Video quiz:
1. What are the four tests and what do they test for? (0:12)
2. How are each of these tests performed? (1:23), (2:18), (2:49), (3:28)
3. For most of these what colour is a negative result? (1:55)
3. What are the steps needed to create the food sample? (0:34)
4. What type of sugar does the benedict's test, test for? (1:04)
5. The benedict's test is performed on four different solutions the solutions are blue, green, yellow, brick red, what does this mean for each solution? (1:55)
6. In the iodine test what colour is a solution with a positive result? (2:31)
7. In the biuret test how much of the solution do you need? (2:49)
8. In the biuret test what colour is a positive result? (3:03)
9. How many drops of Sudan solution do you need for the Sudan III test? (3:34)
10. What happens to the solution when the result is positive? (3:45)

Matt-xhwq

Its somehow so wholesome that there's a whole different gens here revising

leepicstick

This video explained in less than 5 minutes what an hour long lesson in school could not

mimisolo

good luck to all those cramming before thursday😅

Woodchuckler

Who watching these for 2023/2024 igcse??

lxxjxfm

GOOD LUCK EVERYONE 💜💜💜💜 it’s so cute how different years of ppl taking GCSEs are here <3

niamhy

OMG, dude this was so helpful it saved me both time and patience instead of doing all of the research on google. Thanks much

rashood

1 hour before my gcse and this helped me a lot

raadplayz

Sudan 3: seperates Lipids from Solution.
Biuret Solution: changes Protien to Pink or purple.
Iodine Solution: turns Starch to Blue Black.
Benedict's Solution: turns Reducing Sugars to Yellow/brown/red/orange, depending on the concentration of the solution.

dr.abidrogersbhatti

Benedict’s Test - Reducing Sugars
Iodine Test - Starch
Biuret Test - Proteins
Sudan III Test - Lipids

aufyre

1:04 Benedict's test
2:09 Iodine test
2:45 Biuret test
3:23 Sudan III test
3:53 Emulsion test

for anyone who didn't see the one below

rubyreadal

Thank you soo much for this video, it was really helpful for me. I always come to Cognito when I have a problem with Biology and Chemistry.

snowbunny