Green chemistry
Question:

Green chemistry

Based on the video: https://blossoms.mit.edu/videos/lessons/introducing_green_chemistry_science_solutions

Green chemistry is the design of chemical products and processes that reduce or eliminate the use or generation of hazardous substances. Green chemistry applies across the life cycle of a chemical product, including its design, manufacture, use, and ultimate disposal. Green chemistry is also known as sustainable chemistry.

In 1998, Paul and John C. Warner published a set of principles to guide the practice of green chemistry. The twelve principles address a range of ways to reduce the environmental and health impacts of chemical production, and also indicate research priorities for the development of green chemistry technologies.

Twelve principles of green chemistry are:

  1. It is better to prevent waste than to treat or clean up waste after it is formed.
  2. Synthetic methods should be designed to maximize the incorporation of all materials used in the process into the final product.
  3. Wherever practicable, synthetic methodologies should be designed to use and generate substances that possess little or no toxicity to human health and the environment.
  4. Chemical products should be designed to preserve efficacy of function while reducing toxicity.
  5. The use of auxiliary substances (e.g. solvents, separation agents, etc.) should be made unnecessary wherever possible and innocuous when used.
  6. Energy requirements should be recognized for their environmental and economic impacts and should be minimized. Synthetic methods should be conducted at ambient temperature and pressure.
  7. A raw material or feedstock should be renewable rather than depleting wherever technically and economically practicable.
  8. Reduce derivatives – Unnecessary derivatization (blocking group, protection/deprotection, temporary modification) should be avoided whenever possible.
  9. Catalytic reagents (as selective as possible) are superior to stoichiometric reagents.
  10. Chemical products should be designed so that at the end of their function they do not persist in the environment and break down into innocuous degradation products.
  11. Analytical methodologies need to be further developed to allow for real-time, in-process monitoring and control prior to the formation of hazardous substances.
  12. Substances and the form of a substance used in a chemical process should be chosen to minimize potential for chemical accidents, including releases, explosions, and fires.

Watch the video and answer the question:

The video above is presenting two different reactions to produce hydrazine, as the second one is greener than the first.

Which principle of the green chemistry is applied in the second reaction of producing hydrazine?

1 People tried to answer this question

Analytical methodologies need to be further developed to allow for real-time, in-process monitoring and control prior to the formation of hazardous substances.

Chemical products should be designed so that at the end of their function they do not persist in the environment and break down into innocuous degradation products.

Synthetic methods should be designed to maximize the incorporation of all materials used in the process into the final product.

Substances and the form of a substance used in a chemical process should be chosen to minimize potential for chemical accidents, including releases, explosions, and fires.

Excellent!!

 In the second reaction unlike the first one the process for producing hydrazine is without cogenerating salt, the side product is just water.

.

there was no information in the video about any potential accidents and explosions.

Try again

See what was mentioned about the stability of hydrazine

It was motioned that hydrazine is toxic but there was no any mention about Analytical methodologies that has been used to control that



Comments:
1.  Ryndin Alina (22.06.2017 pm 09.15.32)
Peer assessment

Hi Reem,

First of all, I would like to say that I really liked the subject you have chosen. These days, it’s relevant in many aspects (not only in Chemistry). As I read what you’ve written, I thought about many applications of this incredible theme.

The way of the accessibility you used is very good – you showed us 12 principles of the green chemistry and afterward you continued with a beautiful animation you have created and uploaded to YouTube. The theme is described in an excellent way (with a broad professional vocabulary). You have given the whole picture of it using scientific language. Seems you worked hard on it and it really looks great.

The options you gave for the multi-choice question are great, and so are the comments you gave for each choice (whether it was right or wrong).

However, in my opinion giving so much information can get the school student lost. Knowing the students these days, I know how impatient they are and that’s why I think it would be even better to make your video a bit shorter, although it is really good.

In addition to that, pay attention that you write the state of matter as you write the chemical reaction (this is the demand of the ministry of education for the matriculation exam.).

I have really enjoyed watching your question and getting some new information. Thank you for that!

Good luck!

Alina.



History of edits
Edited BY: reem rayyan Edit Date: 2017-05-29 21:15:48
Edited BY: reem rayyan Edit Date: 2017-05-29 21:13:00
Edited BY: reem rayyan Edit Date: 2017-05-29 21:09:33
Edited BY: reem rayyan Edit Date: 2017-05-29 21:01:18
Edited BY: reem rayyan Edit Date: 2017-05-29 20:37:13
Edited BY: reem rayyan Edit Date: 2017-05-29 16:32:41
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