B1 - moles, formulae and equations Flashcards
Mol , mass, mr equation
n = m/mr
how to find number of particles
n x 6.02x10^23
Empirical formula definition
simplest whole number ratio of atoms of each element in a compound
Molecular formula definition
actual number of atoms of each element in a molecule
Anhydrous copper sulphate
blue to white
limiting reagent
reactant that is completely used up in a reaction
percentage yield formula
actual/ theoretical x 100
mol, v, 24 equation
mol = v(dm^3) /24(dm^3)
mol, c, v equation
mol = c (mol/dm^3) x v(dm^3)
Ideal gas equation
pV = nRT
SI units for ideal gas equation
P (pa), V (m^3), n (mol), R (8.314), T (k –> +273)
What state dissociates in ionic equations
aqueous only
Hcl (aq) + NaOH (aq) —> NaCl (aq) + H20 (l) Ionic equation
H+ + Cl- + Na+ + OH- —> Na+ + Cl- + H20 (l)
Cancel spectator ions…
Ionic equation= H+(aq) + OH-(aq) —> H20(l)
Acid definition
H+ donor
Base definition
H+ acceptor
Alkali definition
Soluble base
Salt definition
Compound formed when H+ ion in an acid is replaced by a metal ion or ammonium ion
Strong acid and alkali will…
fully dissociate
Weak acid and alkali will…
partially dissociate
acid + base —>
salt + water (neutralisation)
acid + alkali —>
salt + water (neutralisation)
acid + carbonate —>
salt + water + carbon dioxide (neutralisation)
acid + metal —>
salt + hydrogen (redox)
Volumetric flask % error (250cm)
0.15/250 x 100
Pipette % error (25cm)
0.06/25 x 100
Burette error
0.05cm^3
Titre % error
