OCR A-LEVEL CHEMISTRY MODULE 2 | Questions and Answers with complete solution
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 TWELTH OF THE MASS OF AN ATOM OF CARBON 12. AMOUNT OF SUBSTANCE - THE QUANTITY OF WHOSE UNIT IS THE MOLE. CHEMISTS USE 'AMOUNT OF SUBSTANCE' AS A MEANS OF COUNTING ATOMS AVOGADRO CONSTANT (NA OR L) - THE NUMBER OF ATOMS PER MOLE OF THE CARBON 12 ISOTOPES (6.02x10^23 mol^-1) MOLE - THE AMOUNT OF ANY SUBSTANCE CONTAINING AS MANY PARTICLES AS THERE ARE CARBON ATOMS IN EXACTLY 12g OF THE CARBON 12 ISOTOPE MOLAR MASS (Mr) - THE MASS PER MOLE OF A SUBSTANCE. THE UNITS = g mol^-1 MOLECULE - A SMALL GROUP OF ATOMS HELD TOGETHER BY COVALENT BONDSMOLAR VOLUME - THE VOLUME PER MOLE OF A GAS. UNITS = dm^3 mol^-1. AT ROOM TEMPERATURE & PRESSURE, THE MOLAR VOLUME IS APPROXIMATELY 24.0 dm^3 mol^-1
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