Which row of the table is correct for cracking?
Description Source of raw material
A heating large molecules to make smaller molecules crude oil
B heating large molecules to make smaller molecules nylon, poly(ethene)
C joining small molecules to make larger molecules crude oil
D joining small molecules to make larger molecules hethene, propene - OCR Gateway - GCSE Chemistry: Combined Science - Question 2 - 2019 - Paper 10
Question 2
Which row of the table is correct for cracking?
Description Source of raw material
A heating large molecules to make smaller molecules crude oil
B heating large mol... show full transcript
Worked Solution & Example Answer:Which row of the table is correct for cracking?
Description Source of raw material
A heating large molecules to make smaller molecules crude oil
B heating large molecules to make smaller molecules nylon, poly(ethene)
C joining small molecules to make larger molecules crude oil
D joining small molecules to make larger molecules hethene, propene - OCR Gateway - GCSE Chemistry: Combined Science - Question 2 - 2019 - Paper 10
Step 1
A. heating large molecules to make smaller molecules
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Answer
This describes the process of cracking accurately. Cracking involves breaking down larger hydrocarbons into smaller ones, typically yielding alkanes and alkenes. The source of raw material for this process is usually crude oil.
Step 2
B. heating large molecules to make smaller molecules
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Answer
This is incorrect as nylon and poly(ethene) are not produced from cracking larger hydrocarbons. Instead, they are synthetic polymers made through polymerization. Thus, this description does not align with the concept of cracking.
Step 3
C. joining small molecules to make larger molecules
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Answer
This statement describes the process of polymerization rather than cracking. Therefore, it is not a correct description for the cracking process, which instead reduces larger molecules into smaller ones.
Step 4
D. joining small molecules to make larger molecules
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Answer
Similar to option C, this describes polymerization. This is also incorrect as cracking is specifically about breaking larger molecules into smaller hydrocarbons.
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