C4 - Stoichiometry
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Molecular formula shows
the actual amount of atoms that make up a molecule i.e C6H1206 for glucose
empirical formula shows
simplest ratio of atoms which make up a molecule i.e CH2O for glucose
chemical equation shows
what happens in a chemical reaction using symbols or words
why are symbol equations balanced
atoms aren’t created or destroyed during chemical reactions
ionic equations show reactions involving
ions
ions that play no part in ionic reactions are called
spectator ions
spectator ions are ions that
play no part in an ionic reaction
relative atomic mass is
average mass of all isotopes of an element
what is a mole
an amount of substance
why are moles used
because atoms are so small its inconvenient to talk about individual atoms
1 mole of any substance is
6.02 x 10^23 atoms of substance
6.02 x 10^23 is
avagadros constant
sodium chloride (NaCl) has a relative formula mass of 58.5 so what is the mass of one mole
58.5 g
moles =
mass/relative formula mass
a solution is made when
a solute dissolves in a solvent
1 dm^3
is 1000cm^3
a limiting reactant is when
something is completely used up so the reaction stops when it does
what is the term when more of a reactant is used than is necessary
excess reactant
concentration is measured in
g/dm^3 or mol/dm^3
how much is the molar volume
24dm^3 or 24,000cm^3
Percentage yield of any reaction must always be
less than 100%