Amount of substance

?
  • Created by: Hindleyc
  • Created on: 12-05-18 10:43
What is the relative atomic mass?(Ar)
Average mass of one atom of an element relative to 1/12th of the mass of one atom of carbon-12 (average mass of isotopes)
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Relative molecular mass? (Mr)
Average mass of one molecule of a substance relative to 1/12th of the mass of one atom of carbon-12.
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Relative formula mass? (RFM)
Molecule which contains ions such as ionic compounds
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Moles=
Mass/Mr
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Volume=
Mass/Density
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Avogadros constant?
No particles in a mole- 1 mole of carbon weighs 12g and has a huge no. carbon atoms- 6.022x10^23. (Av c units mol^-1)
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Calc for avogadros constant
mass/mr x (6.022x 10^23)
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Ideal gas equation?
Pv=nRT. P=pressure in Pa. V=volume in m^3. n= no. moles. R= gas constant. T= temperature (K)
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Conversions? CDM. KPa to Pa? MPa to Pa? C to K?
[(Cm- Dm- M) -> /1000 |
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Reacting gas volumes?
Under same conditions 100cm^3 of one gas will have same moles as 100cm^3 of any gas. Got used left. Use smallest number ratios
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Solution calc? how?
Conc= moles/ vol (dm^3). 1) Use vol and conc of one reactant to calc moles. Use balanced or ionic eon to find moles of other reactant 3) calc vol or conc of reactant
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Empirical formula?
Simplest whole number ratio of atoms of each element in a compound- smallest possible whole no.
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Molecular formula?
Actual formula of a compound
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Acid+Metal oxide/hydroxide
Salt and water
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Acid+Ammonia?
Ammonium salt and water
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Acid+Metal carbonates?
Salt and water and co2
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Acid+ reactive metal?
Salt and Hydrogen
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Percentage atom economy?
Molecular mass of desired product/ sum of molecular masses of all reactants x100
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Adv of high percentage atom economy
more greener process- fewer natural resources and less waste
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Other cards in this set

Card 2

Front

Relative molecular mass? (Mr)

Back

Average mass of one molecule of a substance relative to 1/12th of the mass of one atom of carbon-12.

Card 3

Front

Relative formula mass? (RFM)

Back

Preview of the front of card 3

Card 4

Front

Moles=

Back

Preview of the front of card 4

Card 5

Front

Volume=

Back

Preview of the front of card 5
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