Quantative Flashcards
(14 cards)
What is avagadros constant?
The number of particles in one of a substance
What is the equation for working out moles?
Mass = moles x Mr
How to get from cm3 to dm3 ?
Dive by 1000
What is Molecular Mass (Mr) ?
Add up the masses of each atom in the molecule
The equation for calculating concentration ?
Concentration g/dm3 = mass of solute (g) / volume of solution (dm3)
Best definition of a mole ?
A mole is the unit for the amount of substance. The relative atomic mass in grams of a substance in the mass of one mole of the substance.
What is a limiting reactant ?
The reactant that is all used up in a reaction
What is the volume of 250cm3 of solution in dm3 ?
The concentration in dm3 is 250 / 1000 = 0.250dm3
The law of conservation of mass
- No atoms are lost or made during chemical reaction
- Mass of the products the mass of reactants
Balanced chemical equations
The sum of the relative formula masses of the reactants in the quantities shown equals the sum of the relative formula masses of the products in the quantities shown
Define relative mass
The average mass of the isotopes of that element weighted to take into account the abundance of each isotope
Define isotope
Atoms that have the same number of protons but different number of neutrons
( same atomic number but different mass number )
Define concentration
The mass of solute in a given volume of solution
