Skin creams contain many different chemicals - Scottish Highers Chemistry - Question 6 - 2018
Question 6
Skin creams contain many different chemicals.
(a) Retinol (vitamin A) promotes cell regeneration.
One method of supplying retinol to the skin is by using a skin cr... show full transcript
Worked Solution & Example Answer:Skin creams contain many different chemicals - Scottish Highers Chemistry - Question 6 - 2018
Step 1
Name the type of reaction that occurs when retinyl palmitate is broken down to form retinol.
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Answer
The type of reaction that occurs when retinyl palmitate is broken down to form retinol is called hydrolysis.
Step 2
Write a molecular formula for retinol.
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Answer
The molecular formula for retinol is C20H30O.
Step 3
Describe how free radicals are formed.
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Free radicals are formed through the process of bond breaking, often initiated by UV light. This reaction leads to the formation of free radicals from stable molecules.
Step 4
State the name given to this step in the chain reaction.
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The name given to this step in the chain reaction is propagation.
Step 5
State how free radical scavengers prevent further chain reactions.
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Answer
Free radical scavengers can react with free radicals, forming stable molecules, which prevents further chain reactions. They may also donate electrons to pair with unpaired electrons in free radicals.
Step 6
Circle a peptide link in the above structure.
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The peptide link in the structure can be identified between an amino group (-NH2) and a carboxylic group (-COOH).
Step 7
Draw a structural formula for the amino acid serine.
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The structural formula for serine is shown below:
HO
|
H2N-C-COOH
|
CH2
This represents the amino group, the carboxylic acid group, and the side chain of serine.
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