3.5 Questions and Answers - Chemteach - University of Canterbury - New Zealand

3.5 Questions and Answers Archive

  1. Can you clarify examples for primary alcohol/H+, primary alcohols, and H2O/H+?
  2. Are substitution reactions of alcohols and haloakanes no longer included?
  3. IUPAC nomenclature
  4. I have a question about whether or not to include a particular reaction
  5. What is the reagent used to produce amides from acid chlorides?
  6. Unit standards to assess Level 3 Organic

Q1. Can you clarify examples for primary alcohol/H+, primary alcohols, and H2O/H+

A. Different reagent conditions are required depending on the particular conversion required. Eg: primary alcohols/H+ would be used to convert a carboxylic acid to an ester but only a primary alcohol is required in the conversion of an acid chloride to an ester. The H2O/H+ would be used to convert an amide to a carboxylic acid.

Q2. Substitution reactions will include interconversions of carboxylic acids and their derivatives. Does this mean substitution reactions of alcohols and haloakanes are no longer included?

A. These are included - the statement is "will include" (not "are limited to").

Q3. Do you have a link to any sites which give up to date IUPAC conventions for naming organics. The IUPAC website seems to be of little help.

A. I find these sites useful for Organic Nomenclature

http://www.acdlabs.com/iupac/nomenclature

http://www.chem.ucalgary.ca/courses/351/Carey5th/nomenclature

Q4. I have a question about whether or not to include a reaction as part of the level 3 Organic Chemistry Achievement Standard. The prescription clearly has HBr as a reagent for substitution reactions. There is a reaction where a NaBr/conc H2SO4 mixture (which generates HBr in situ ) is used with a primary alcohol to generate a bromoalkane. This reaction doesn't appear in most of the popular text books (including the excellent new Yr 13 study guide) so do you think we should ignore it?

A. I think it would be unlikely to be used in a particular question that specified this reagent and I can't see the point of including it when there are plenty of easier alternatives that the students can use if they are required to specify the reagent themselves. My advice would be why introduce extra material into an already content/recall heavy component of the course?

Q5. What is the reagent used to produce amides from acid chlorides - alcoholic ammonia or concentrated ammonia? What is the other product - hydrogen chloride or ammonium chloride?

A. Alcoholic ammonia to minimise formation of carboxylic acid (from water present in either aqueous or conc solutions). By-product will be ammonium chloride.

Q6. I am keen to find exemplars assessments for the 6344 Level three Unit Standard in Organic Chemistry. I am hoping to offer this as an alternative to Achievement Standard 3.5. But have no experience with Unit Standards. Any way you can help?

Go to our new website for Chemistry teachers and to the page on internal assessment for Year 13 where you will find a large number of unit standards exemplars. The page is pass word protected but you can obtain the password by following the instructions on the page. You need to check that these exemplars match the standard as they were written some time ago and they may require a little tweaking. They are a very good start point, however.

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