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31 Cards in this Set
- Front
- Back
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Are addition polymers reactive or unreactive |
Unreactive because there are no double bond |
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3 different types of condensation polymers |
Polyamides, polypeptides , polyesters |
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How to make polyamides |
Dicarboxylic acid + diamine |
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How is polyester made? |
React dicarboxylic acid with diol |
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Lactic acid can form polymers on their own because |
They have both a hydroxyl group and a carboxyl group |
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Reverse of condensation polymerisation? |
Hydrolysis of polymers (by adding water, acid or alkali) |
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Polyamide will hydrolyse easier with.... |
Acids |
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Polyesters will hydrolyse easier with....... |
Alkali |
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An example of a biodegradable polymer= |
Poly(lactic acid) |
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What classifies a polymer as photodegradable? |
Condensation polymers with C=O group. |
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During hydrolysis of polyester using alkali what are the product formed? |
Diol and a Dicraboxylic acid salt |
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What is an alpha amino acid? |
An amino acid with both COOH and NH_2 group attached to the same carbon atom. |
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Amino acids are amphoteric because.... |
They act as a base and an acid (COOH donates a proton while NH_2 accepts a proton) |
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What is an Isoelectric point |
The pH at which an amino acid exists mainly as zwitterion.
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In conditions more acidic than ISO point |
The NH_2 group is likely to be protonated |
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In conditions more basic than ISO point |
The COOH group is likely to be deprotonated |
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Hydrolysis of polyester makes? |
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Polyamides will hydrolyse more easily with ..... |
Acids than alkali |
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What is an alpha amino acid? |
And amino acid with both carboxyl and amino group attached to same carbon atom. |
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Amino acids are amphoteric because.... |
They can act as a base and also as an acid |
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A zwitterion is... |
A dipolar ion (it has both negative and positive charge in different parts of the molecule) |
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A zwitterion only exist.... |
Near an amino acids isoelectric point (this is the pH where the average overall charge is 0, it depends on the functional group attached) |
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How does changes in pH effect properties of amino acid |
<pH amino acid acts as base >pH amino acid acts as acid At isoelectric point amino acids act as a base |
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Dipeptides are formed by..... |
Condensation of two amino acid |
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Polypeptides are made up of..... |
Lots of amino acids join together |
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Proteins are made up of.. |
One or more polypeptides folded into precise 3D shapes |
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Two reagents that can be used to break down amino acid |
Water and alkali *when using alkali carboxylate salts are formed |
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Enantiomers are... |
Mirror image of the same molecule, they can't be superimposed |
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Recemic mixture is.... |
50/50 mixture of Enantiomers used in medical synthesis |
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A racemate doesn't show any..... |
Optical activity, because the two Enantiomers cancel each others rotation due to equal quantity of Enantiomers |
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Synthetic drugs contain one Enantiomer why? |
To reduce side effect by eliminating the bad Enantiomers (D Enantiomer of meth is bad but an E Enantiomer of meth is good, used as nasal spray) |
