Flashcards

Amounts of Substances

Benjamin Rogers-Newsome Chemistry AS level Inglês 21 flashcards

Flashcards do conjunto (21)

1Relative Atomic Mass (Ar)The average mass of an atom of an element, taking into account it's naturally occurring isotopes, relative to 1/12th the mass of carbon-12
2Relative Molecular Mass (Mr)The average mass of a molecule compared to 1/12th the mass of carbon-12
3Relative Formula Mass (Mr)The same as relative formula mass for ionic compounds as they do not exist as molecules
4Avogadro's Constant Na6.022 x 10^23
The number of atoms in 12g of carbon-12
5A Mole6.022 x 10^23 particles.
A substances formula mass weighed out in grams will contain one mole of that substance
6Equation linking Moles, Mass and MrNo. Moles n = Mass m (g) / Mr of substance
7Equation linking Particles and MolesNo. Particles = Na x No. Moles n
8A SolutionA solvent with solute dissolved in it
9Equation linking Concentration, Moles, and VolumeConcentration C (moldm^-3) = No. moles n (mol) / Volume V (dm^3)
10The ideal gas equationPressure P (Pa) x Volume V (m^3) = no. moles n (mol) x gas const R (JK^-1mol^-1) x temperature T (K)
11Degrees Celcius to Kelvin+ 273
12KPa to pax 10^3
13cm^3 to dm^3x 10^-3
14dm^3 to m^3x 10^-3
15cm^3 to m^3x 10^-6
16m^3 to cm^3x 10^6
17m^3 to dm^3x 10^3
18dm^3 to cm^3x 10^3
19Empirical FormulaThe simplest ratio of atoms of each element in a compound
20Molecular FormulaThe actual ratio of atoms of each element in one molecule of the compound.
For ionic substances, actual ratio is the empirical formula.
21State Symbols(s) - solid
(l) - liquid
(g) - gas
(aq) - aqueous