A student heats a sample of crude oil and collects different fractions. Which fraction would be collected at the lowest temperature?

Q: How do I try a free CIE Co-ordinated Science (Double Award) question?

Just tap any of the four options on this page — no signup, no card, nothing to install. You'll see the correct answer and a full mark-scheme-style explanation within a second. Each visit shows a fresh randomly-picked question from the live CIE IGCSE Co-ordinated Science (Double Award) bank, so you can keep refreshing to try different ones before deciding whether to create a free account for daily access.

Q: Is Kramizo really free for CIE Co-ordinated Science (Double Award) students?

Yes — completely free. Every student gets 45 questions a day on the free plan, across any board and any subject, with no card required and no trial countdown. Kramizo's optional Pro plan removes the daily cap and adds analytics, but the free plan is genuinely free forever. We make money from the small percentage of students who choose to upgrade — not from selling data or ads.

Q: Are the Co-ordinated Science (Double Award) questions aligned to the CIE IGCSE syllabus?

Every question is written against the published CIE IGCSE Co-ordinated Science (Double Award) syllabus and reviewed for accuracy before being added to the bank. We match the command words (state, describe, explain, evaluate), mark allocations, and difficulty tier you'll see on real CIE past papers. Explanations are written in the style of official examiner mark schemes so students learn exactly what marks are being awarded for.

Question

A student heats a sample of crude oil and collects different fractions. Which fraction would be collected at the lowest temperature?

Accepted Answer

Refinery gas, because it has the lowest boiling point — Refinery gas contains the shortest hydrocarbon chains (C1–C4), which have the weakest intermolecular forces and therefore the lowest boiling points, so they are collected first at the lowest temperature. Diesel has longer chains and higher boiling points than petrol, not lower. Bitumen has the longest chains and is collected last at the highest temperature. Kerosene has intermediate chain lengths and is not the first fraction collected.

Answer

Refinery gas, because it has the lowest boiling point

Answer

Bitumen, because it has the longest carbon chains

Answer

Diesel, because it is denser than petrol

Answer

Kerosene, because it is used as jet fuel

One real Co-ordinated Science (Double Award) question.No signup. 30 seconds.

One real Co-ordinated Science (Double Award) question.
No signup. 30 seconds.