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Mon Pro online paperMarked Question 5 of 22
GCSE ChemistryPaper 1 · Higher1h 45m

[4 marks]5. Calcium carbonate decomposes on heating. Calculate the mass of CO₂ produced from 25 g of CaCO₃. (Mᵣ: CaCO₃ = 100, CO₂ = 44)

Your answer Submitted
moles = 25 ÷ 100 = 0.25 molmass = 0.25 × 44 = 11 ← units! (g)
3 / 4
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Mon Pro paperGCSE Chemistry · AQA · Higher · Paper 1
MarkedQuestion 06 of 22
06

Explain why increasing temperature makes a reaction happen faster.

[2 marks]
Your answerSubmitted

The particles move faster, so they collide more often.

1 mark awarded

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Sample

Paper report · Chemistry

Student Amara O.Year 10Board AQA · HigherPaper 1Marked 3 July 2026
Marked byMiss U.Qualified science teacher
This paper58/80
Practice comparisonNot an official grade or prediction
Teacher's read“Amara is close to her target. Mole calculations are the difference.”Miss U.

For your child

On trackMostly secureWorking onSome marks lostNeeds focusMany marks lost

Marks by topic

Atomic structure1112On track
Bonding & structure1418On track
Chemical changes1216On track
Energy changes78On track
Rates & equilibrium914Working on
Quantitative chemistry512Needs focus

What the marking showed

What worked. Where marks were lost.

What went well

Marks secured

  • Bonding is secure.

    Ionic, covalent and metallic bonding were explained correctly.

Where marks were lost

Fix these first

  • Mole calculations.

    Five marks were lost across Q14 and Q18 by not converting mass to moles first.

    Seen in Q14 · Q18
Miss U.

Marked by Miss U.

“I write every paper. I mark every answer.”

Qualified science teacher · AQA GCSE science

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