Question detail
What is the relationship between viscosity and the size of hydrocarbon molecules?
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. Viscosity decreases with size
- B. Viscosity remains constant
- C. Viscosity increases with size
- D. Viscosity is unrelated to size
Answer
The correct option is Viscosity increases with size.
Explanation
The correct option is Viscosity increases with size. Viscosity increases with size is correct because it directly supports the approved learning objective to state that some properties of hydrocarbons depend on the size of their molecules, including boiling point, viscosity and flammability. This belongs to Properties and combustion of hydrocarbons 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
Misunderstanding Hydrocarbon Properties
Students often think that all hydrocarbons have the same boiling point, viscosity, and flammability regardless of their molecular size.
Emphasize that the properties of hydrocarbons, such as boiling point, viscosity, and flammability, change with the size of their molecules. Larger molecules generally have higher boiling points and viscosities.
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