Head Start Flashcards
(29 cards)
What is Molecular Mass, what are the units and what symbol do we represent it by?
It is the sum of the atomic masses of all atoms in a molecule. It has no units. It is represented by Mr.
What is Molar Mass, what are the units and what symbol do we represent it by?
It is the sum of the atomic masses of all atoms in a molecule, in 6.02 x 10^23 formula units of the substance (1 mole). Units are gram/mol
What does a mole contain?
6.02x10^23 formula units
State the number of particles in 1 mole of water
In 1 mole of any substance, there are 6.02 x 10^23 formula units therefore 1 mol of water contains 6.02 x 10^23 water molecles.
Formula to calculate mass *given moles
m=Mrxn
Formula to calculate moles *given mass
n=m/Mr
What is Avogrado’s number and what does it mean?
It is 6.02x10^23. It is the number of formula units present in one mole of a substance.
Formula to calculate particles *given moles
N=nxNa
What is Avogadro’s number?
6.02x10^23
Formula to calculate moles *given particles
n=N/Na
How do you calculate relative atomic mass?
RAM = (mass of isotope 1 x abundance) + (mass of isotope 2 x abundance)/ 100
What does percent yield =?
actual yield/theoretical yield x 100
Give two reasons why yield can never be 100%
-wastage and mistakes
-control problems
acid + metal
salt + hydrogen
acid + metal oxide
salt + water
acid + metal hydroxide
salt + water
acid + metal carbonate
salt + water + carbon dioxide
base + acid
salt + water
formula to calculate moles given concentration and volume
n=CV
formula to calculate concentration given moles and volume
c=n/v
What is a standard solution?
One in which the concentration is accurately known
What is the unit for concentration?
M
What is the difference between end point and equivalence point?
End point = denotes a change of indicator color
Equivalence point = the point at which the reactants are stoichiometrically equal
What is Specific Heat Capacity and what are its units?
It is the energy required to heat up 1kg of a material or one gram of a material by one degree celsius. Units = kj/jk/degrees celsius
