In this video, students will learn why we cry while cutting onions, and will answer questions related to the different substances present in onions. Prior knowledge on structure and bonding, different graphic representations of molecules, the collision model, enzymes and isomers, is required.
Play Video
$C_{2}H_{4}OS$
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
$C_{3}H_{6}OS$
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
$C_{2}H_{2}OS$
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
$C_{3}H_{4}OS$
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
Hydrogen bonds exist between the molecules of the tear-triggering substance.
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
At least one polar covalent bond exists between the molecules of the tear-triggering substance.
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
The tear-triggering substance is produced in onion from propene sulfenic acid by an enzyme.
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
The tear-triggering substance is an isomer of propene sulfenic acid.
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
Wearing diving goggles - the tear-triggering substance is formed and is dispersed to the environment, but cannot reach the eyes.
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
Heating up the onion in the microwave - the energy of the tear-triggering substance increases, and therefore the tear-triggering substance evaporates faster and reaches the eyes less.
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
Cooling the onion in a refrigerator or a freezer - the number of collisions between the molecules of the enzyme and the molecules of the propene sulfenic acid is reduced, and therefore the rate of formation of the tear-triggering substance is reduced.
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
Rinsing the onion in water while cutting - some of the molecules of the tear-triggering substance are water-soluble, are washed away and do not reach the eyes.
Well Done! Partial Correct Answer Correct Answer Incorrect Answer
questions related to the different substances present in onions. Prior knowledge on structure and bonding, different graphic representations of molecules, the collision model, enzymes and isomers, is required.
Graphic representation of molecules, Molecular substances, intermolecular bonds, isomers, hydrogen bonds, enzymes, reaction rate, collision model
Knowledge building
Are males actually needed for reproduction? Possibly not, but it is certainly easier with them.
A measles outbreak due to anti-vaxxer activity, questionable therapists showcased on TV and politicians who do not hesitate to lie and twist facts to serve financial interests. These are only some of the challenges that science had to face in 2018. Is this a lost war?
The answer is blowing in the wind: For the first time, researchers have shown how hurricanes can affect the evolution of lizards –simply by casting those less capable of withstanding the powerful winds into the sea.
