Look at the displayed formula of the monomer butene - OCR Gateway - GCSE Chemistry - Question 22 - 2018 - Paper 1
Question 22
Look at the displayed formula of the monomer butene.
(a) What feature of butene molecules allows them to act as monomers?
(b) Butene is an alkene.
What is the gene... show full transcript
Worked Solution & Example Answer:Look at the displayed formula of the monomer butene - OCR Gateway - GCSE Chemistry - Question 22 - 2018 - Paper 1
Step 1
What feature of butene molecules allows them to act as monomers?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Butene molecules contain a carbon-to-carbon double bond, which makes them unsaturated. This feature allows them to react with one another during the addition polymerisation process.
Step 2
What is the general formula for an alkene?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The general formula for an alkene is C_nH_{2n}, where n represents the number of carbon atoms.
Step 3
Write the displayed formulae, for poly(butene).
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The displayed formula for poly(butene) can be represented as:
[-CH2-CH(CH3)-]n
This indicates the repeating unit of the polymer chain.
Step 4
What are the monomers in DNA called?
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The monomers in DNA are called nucleotides.
Step 5
What is the minimum number of functional groups that a monomer must have to form a condensation polymer?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A monomer must have a minimum of two functional groups to form a condensation polymer.
Step 6
Complete the block diagram to show the formation of a polyester.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
In the block diagram for polyester formation, you would illustrate the reaction between a dicarboxylic acid and a dialcohol, showing:
HOOC-[-C-]n-COOH
+
HO-[-C-]m-OH
→ [-COO-]n
This indicates the linkage of the two components.
Step 7
What is the formula of the molecule that is eliminated in the reaction to form a polyester?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The formula of the molecule eliminated in the condensation reaction is H2O.
Step 8
Describe how to make nylon in a laboratory.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To make nylon, carefully measure out hexanedioyl dichloride and hexane-1,6-diamine in a controlled environment. Use a separating funnel for the reaction, ensuring to pour the dichloride solution slowly onto the diamine solution. Maintain a safe distance to avoid exposure to corrosive vapors.
Step 9
Describe and explain three precautions needed to control the hazards in this experiment.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Use of Personal Protective Equipment (PPE): Always wear gloves, goggles, and a lab coat to protect against splashes of corrosive chemicals.
Fume Hood: Conduct the reactions in a fume hood to prevent inhalation of harmful fumes.
Proper Disposal: Dispose of all chemicals via designated waste containers to avoid environmental contamination and ensure safety.
