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Exam (elaborations)
OCR A LEVEL CHEMISTRY MODULE 2 Exam Questions With Detailed Answers
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---10December 20242024/2025A+
- OCR A LEVEL CHEMISTRY MODULE 2 Exam Questions With 
Detailed Answers 
 
Define atom economy 
The percentage of atoms that react to form the desired product 
What is water of crystallisation? 
Water molecules that are bonded into a crystalline structure of a compound 
What is the equation for atom economy? 
(total Mr of desired products/ total Mr of all products) x 100 
Why is a high atom economy important? 
More efficient reactions, preserves raw materials, reduces waste 
Name a group of weak a...
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Exam (elaborations)
OCR A-LEVEL CHEMISTRY MODULE 2 | Questions and Answers with complete solution
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--6July 20232022/2023A+Available in bundle
- ISOTOPES - ATOMS OF THE SAME ELEMENT WITH DIFFERENT NUMBERS OF NEUTRONS 
ATOMIC (PROTON) NUMBER - NUMBER OF PROTONS IN THE NUCLEUS 
MASS (NUCLEON) NUMBER - NUMBER OF PARTICLES (PROTONS & NEUTRONS) IN THE NUCLEUS 
ION - A POSITIVELY OR NEGATIVELY CHARGED ATOM OR (COVALENTLY BONDED) GROUP OF ATOMS 
RELATIVE ISOTOPIC MASS - THE MASS OF AN ISOTOPE COMPARED WITH ON TWELTH OF THE MASS 
OF AN ATOM OFCARBON 12 
RELATIVE ATOMIC MASS - THE WEIGHTED MEAN MASS OF AN ATOM OF AN ELEMENT COMPARED 
WITH ONE TWE...
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