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Summary Chemistry A levels Definitions and Key Points
This note contains ALL the definitions required in the syllabus and provides in-depth answer techniques to recurring questions over the past few years.
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Modules 2: Foundation in chemistryAtom and RAM
State what is meant by isotopes (1)
• Atoms of the same element with the same numbers of protons AND
• With different numbers of neutrons and different masses
Define the term relative isotopic mass (2)
• The mass of an isotope
• Compared with 1/12th the mass of a carbon-12 atom whose mass is
exactly 12
Define the term relative atomic mass (3)
• The weighted mean mass of an atom of an element
• Compared with 1/12th the mass of a carbon-12 atom
• Whose mass is exactly 12
,Acid and redox
Define a salt (1)
• The H+ ion in an acid has been replaced by a metal ion/ NH4+ ion
Why is ammonia acting as a base in this neutralisation? (1)
• Accepts H+
Define an acid (1)
• A proton donor
What is meant by a mole? (1)
• A mole is the number of atoms present in exactly 12g of carbon-12
isotope
, Amount of substances
PV = nRT where
P is in Pa
V is in m3
N is the number of mole
R is a constant
T is in K
• Water of crystallisation is the water associated with a salt that is
essential for it to form a crystalline structure
• Blue crystals of hydrated copper (II) sulfate
• White anhydrous copper (II) sulfate
How to make sure the experiment is accurate?
• Heat to constant mass
• No further decomposition
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