Very good idea for a question, the video is colorful and brings
attention to the phenomenon. Household materials and clear, well built video
allow repeating the experiment at home. The picture with a soap molecule explains
in a simple way the structure of the molecule, which is important for the
The table a little bit complicated because of the High SCC Milk information,
it can affect concentrating on the necessary information.
I am not so sure about the statement in the right answer which is
saying that "fat molecules are free to
react with the food color".
I tried to find some
information about the phenomenon, here is a link to some scientific explanation
from one of the Canadian universities:
The point on the map helps to
understand what happens in the video and related well to the topic.Maybe you should add one or two sentences
about the way the structure breaks the bonds and which bonds are in fats and
Small misprint - in the right answer you've written
"peoteins" instead of "proteins".
The experiment you present in your question is very
beautiful!The movie you created will probably
be very attractive for students, and will arouse curiosity. The question
requires high cognitive level in order to answer it.
Here is my feedback:
·I looked at the curriculum of
grades 7,8 and 9, and didn’t find a subject which clearly provides the knowledge
and ability to answer your question. Did you make sure that the required knowledge
for this question is indeed taught in class?
·I didn’t find English
mistakes in your text, but some sentences are not totally clear and might
create confusion. For example: “dish soap drop reinforces the bonds between the
proteins or the fats with the solution”. The word ‘with’ doesn’t quite fit here
(and the word ‘from’ in a similar sentence at your correct answer), and the ‘or’
is confusing. A separation like “the bonds between the protein and the solution,
or the bonds between the fat and the solution” might help.
·The correct answer is not totally
correct. The movement is due to the reaction between the soap, fat and water.
This movement will also happen without the presence of colors, but the colors
enable us to see this movement. I’m sure you know this, but the correct answer
does not clearly say this.
By the way, this phenomenon is also related to surface area tension, and the described
reaction with the soap is not the only reason for the movement we see. Maybe it
should be noted somewhere that this is part of the explanation to the
·It is not correct to
describe milk as a solution which contains fats, protein, and others. It is not
a solution, but a colloid (emulsion).
·According to the assignment
instructions the question should include a simulation or animation. You included
a movie you created which might be accepted instead. Anyway, I tried to look
for a relevant simulation at the Phet website, but couldn’t find one. I found
two movies with nice animations, that explain in a simple and visual way how
·The information point you
added on the map has indeed a connection to the question, but it should
provide additional information that can help the student answer the question,
and it should include an original movie, related to this extra information, and
connects the question to the student’s everyday life. Your information point
doesn’t include all that. My suggestion is to add information about how soap
works. This information will help the student answer your question. The movie should deal with the same subject. We’ve
been asked to create an original movie here, but since you created an original
movie for the question itself, it might be ok to use a non-original movie – ask
the course stuff. In such case, the movies I mentioned earlier might feet here.
Notice that you can’t use the movie you already created as the movie for the
information point, since it doesn’t include extra information, it is
part of the question itself.
·On my opinion, the
distractors you wrote are a bit problematic: There are two answers which
contain the word hydrophilic/hydrophobic, both are wrong answers. In the information
point these words are used. The correct explanation is indeed related to hydrophilic/hydrophobic
properties, but the correct answer doesn’t mention them. This might be an
unnecessary deception for the student. I think all answers should include this
I added a point on the map which provides some information about
milk, and as such, it can help understand better what happens in the experiment
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