Edexcel chemistry - Formulae, equations, and amounts of substance

  • Created by: Priya
  • Created on: 06-12-12 19:13
The atom consists of protons, neutrons and...
Electrons
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What is the relative atomic mass?
The average mass of an atom of an element on a scale where an atom of carbon-12 is 12
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What is the definition of a mole?
The amount of a substance that contains as many particles as there are in 12 grams of carbon-12
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Number of moles =
mass of a substance/molar mass
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Number of moles in a solution =
concentration x volume (cm3)/1000
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What is the difference between a molecular formula and an empirical formula?
The empirical formula just gives the smallest whole number ratio of atoms in a compound whereas the molecular formula is the actual number of molecules or atoms in a compound.
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What is an ionic equation?
A balanced chemical equation in which strong electrolytes are written as dissociated ions
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What is the formula for working out gas volumes in moles?
volume (cm3)/24000
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What reacts to give you a salt?
An acid and a base
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What does a double salt contain?
Two different cations or anions
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What is the percentage yield formula?
actual yield/theoretical yield x 100%
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What is the atom economy formula?
molecular mass of desired product/sum of molecular masses of all products x 100%
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Other cards in this set

Card 2

Front

What is the relative atomic mass?

Back

The average mass of an atom of an element on a scale where an atom of carbon-12 is 12

Card 3

Front

What is the definition of a mole?

Back

Preview of the front of card 3

Card 4

Front

Number of moles =

Back

Preview of the front of card 4

Card 5

Front

Number of moles in a solution =

Back

Preview of the front of card 5
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