This common misconceptions covers Common Misconceptions within Alkanes for GCSE Chemistry. Topic 38: Alkanes It is section 8 of 12 in this topic. Use this common misconceptions to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 8 of 12
Practice
20 questions
Recall
0 flashcards
⚠️ Common Misconceptions
Misconception 1: "Methane has double bonds"
Methane (CH₄) is the simplest alkane — it has only single bonds. One carbon bonded to four hydrogens: C has 4 bonds, each H has 1 bond. There is absolutely no C=C double bond in any alkane. The "saturation" in "saturated" means every possible hydrogen has been added — no room for more.
Misconception 2: "Saturated means the molecule has absorbed lots of energy"
In chemistry, "saturated" has a specific structural meaning — it refers to carbon compounds where all C-C bonds are single bonds. It has nothing to do with energy absorption. The molecule is "saturated" with hydrogen — every carbon has as many hydrogens as it can possibly bond to.
Misconception 3: "All alkanes are gases"
Only the first four alkanes (methane to butane, C1-C4) are gases at room temperature. C5-C17 are liquids (petrol, kerosene, diesel), and C18+ are waxy solids (like candle wax). The boiling point increases with chain length because of stronger forces between molecules.