Question detail
What is the general outcome of catalytic cracking?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Carbon compounds as fuels and feedstock
Question
- A. It produces larger hydrocarbons.
- B. It produces smaller hydrocarbons.
- C. It only produces alkenes.
- D. It only produces solid fuels.
Answer
The correct option is It produces smaller hydrocarbons..
Explanation
The correct option is It produces smaller hydrocarbons.. It produces smaller hydrocarbons. is correct because it directly supports the approved learning objective to balance chemical equations as examples of cracking when given the formulae of the reactants and products. This belongs to Cracking and alkenes within Carbon compounds as fuels and feedstock, so the answer must use the correct organic chemistry context. The other options are incorrect when they confuse the organic family, formula type, reaction condition, product, or property being tested. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.
Common mistake
Incorrectly balancing catalytic cracking equations
Students often write the same number of carbon atoms on both sides of the equation but forget to balance the hydrogen atoms, leading to an unbalanced equation that still looks plausible.
Check that the total number of each element is equal on both sides of the equation. After balancing the carbon atoms, count the hydrogen atoms on each side and add the appropriate number of H₂ gas molecules (or other hydrogen-containing products) until the hydrogen atoms are also balanced. Verify the equation by ensuring the sum of the atomic counts for every element is identical on both sides.
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