Amount of substance Flashcards
Spectator Ions
? Ions that do not take part in the reaction
Ionic Equation
? An equation that represents ions that took part in the reaction
Relative Atomic Mass (Ar)
? Weighted average mass of all the isotopes of an element relative to C-12
Relative Molecular Mass (Mr)
? Average mass of a molecule relative to 1/12 of an atom of C-12
The mole
? the amount of substance in grams that has the same number of particles as there are atoms in 12 grams of carbon-12. (always to 1d.p)
Limiting Reagent
? Reactant that is not in excess, worked out using calculations
Atom economy
? Measure of what proportion of the products of the reaction are the desired products and how much is wasted.
Percentage atom economy
? Molecular mass of desired product/sum of molecular masses of all reactants * 100
How do you calculate atom economy?
Mass of wanted product / total mass of product *100
Titration
? A practical technique which can be used to calculate concentrations of solutions
Standard Solutions
? Solution with a known concentration
Boyle’s Law
? Pressure of a fixed mass gas under standard conditions is inversely proportional to volume. P1V1 = P2V2
Charles Law
? Volume of a fixed mass gas under standard conditions is proportional to temperature.
V1/T1 = V2/T2
Gay Lussac’s law
? Pressure of a fixed mass gas under standard conditions is proportional to volume.
P1/T1 = P2/T2
Empirical formula
? Simplest integer ratio of atoms of each element in the compound
