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12
0.5 mol×24=12.
Engineering admission · Other / specialist pathway · Chemistry
Physical, inorganic and organic chemistry
Integrate chemical quantities, structure and reaction reasoning.
Original Model Test for Exam unit. These questions and suggested practice times are independent Kidemy material, not an official or past paper. Choose modules for the target programme; all listed subjects are not required for every applicant.
Learn the idea
A demanding chemistry solution still begins with a correct formula and balanced equation. Equilibrium and rate are different questions. Organic reaction predictions require structure and conditions. Separate a theoretical maximum from observed recovery.
Worked example
CaCO3 → CaO + CO2 has a 1:1 amount ratio. Using 100 g/mol for CaCO3, 25 g is 0.25 mol and can produce 0.25 mol CO2. At a stated ideal-gas molar volume of 24 dm³/mol, that is 6 dm³.
- Balance and convert quantities.
- State conditions for gas or equilibrium models.
- Explain structure and reaction type.
Your written practice
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3
−log10(10^-3)=3.
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1
Its two carbon atoms share one double bond.
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It changes rates of both directions without changing the equilibrium constant.
Distinguish speed from equilibrium composition.
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12/16×100=75%; three quarters of the theoretical mass was recovered under the stated case.
Define the numerator and denominator and note possible recovery losses.
Chemistry model test
Write mole and structural solutions with stated conditions.
Review with a guardian or teacher
- Use correct formulae.
- Show coefficient ratios.
- Do practical discussion on paper only.
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