During the manufacture of quick lime from limestone in Jamaica, the following reaction occurs:

CaCO₃ → CaO + CO₂

This reaction requires continuous heating. What does this indicate about the energy change?

Q: How do I try a free CXC Chemistry 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 CXC CSEC Chemistry 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 CXC Chemistry 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 Chemistry questions aligned to the CXC CSEC syllabus?

Every question is written against the published CXC CSEC Chemistry 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 CXC past papers. Explanations are written in the style of official examiner mark schemes so students learn exactly what marks are being awarded for.

Question

During the manufacture of quick lime from limestone in Jamaica, the following reaction occurs:

CaCO₃ → CaO + CO₂

This reaction requires continuous heating. What does this indicate about the energy change?

Accepted Answer

The reaction is endothermic and absorbs energy — Award 1 mark for recognising that continuous heating requirement indicates energy must be absorbed. A is incorrect because exothermic reactions release heat and would not need continuous heating. C describes a different reaction type. D is incorrect as all chemical reactions involve energy changes.

Answer

The reaction is endothermic and absorbs energy

Answer

The reaction does not involve energy changes

Answer

The reaction is exothermic and releases energy

Answer

The reaction is neutralisation

One real Chemistry question.No signup. 30 seconds.

One real Chemistry question.
No signup. 30 seconds.