C4 Flashcards
Calculations
What is the difference between between MR and AR
MR= relative Formula mass
AR= relative atomic mass
How do to the calculate the percentage mass of an element in a compound
Ar x num of atoms X 100
—————————
Mr of the compound
What is avagados constant?
6.02 x 10^23
What is the formula for finding moles?
Mass
———- =moles
Mr
Which law is crucial to remember in chemical reactions?
Law of conservation of mass
What is a limiting reactant
When one reactant gets completely used up while the other is in excess
What is the formula for calculating gas volume?
Mass of gas
—————— x 24 = volume of gas
Mr of gas
What is the equation for concentration including mass
Mass of solute(g)
——————— = concentration
Volume of solvent(dm^3)
What is the equation for concentration including moles
No of moles in solute (mol)
————————————— = concentration
Volume of solvent (dm^3)
How to find the concentration in moles/dm^3
No of moles
——————
Concentration x volume
What is the equation for atom economy
Mr of desired products
——————————— x100= atom economy%
Mr of all reactants
What is an isotope?
Different atoms of the same elements with different numbers of neutrons
