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Page 1

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Atoms & Reactions
The Atom

Mass number (the top) = protons + neutrons Atomic number (the bottom) = protons.
Isotopes have the same chemical properties, due to same election configuration but different physical properties e.g.
densities due to a different mass.

Atomic Models

John Dalton ­ Solid spheres, different spheres…

Page 2

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Balancing Equations

With ionic equations balance charges too (so add electrons (e-))

Equations and Calculations

Calculating masses
o Write out the balanced equation for the reaction.
o Work out how many moles of reactant you have.
o Use the molar ratio from the balanced equation to work out the number…


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