Flashcards
Atoms, Ions, and Compounds
Flashcards do conjunto (26)
- 1Atomic NumberNumber of protons
Number of electrons - 2Atomic MassNumber of protons
Number of neutrons - 3C-12Standard mass of 1u is 1/12th the mass of an atom of C-12
- 4RIMMass of an isotope relative to 1/12th the mass of a C-12 atom
- 5RAMWeighted mean mass of an atom of an element relative to 1/12th mass of C-12
- 6Determining RAM1. Sample placed in mass spectrometer.
2. Vaporised, ionised to form ions.
3. Ions accelerate, heavier more more slowly
4. Ions detected on a mass spectrum as a m/z ratio - 7Determining RAM formula(%*mass)+(%*mass)/100
- 8Polyatomic ions (2)Nitrite NO2-
Sulphite SO3 2- - 9What is avogadro constant?6.02*10^23
# Particles in 1 mole of C-12 - 10Molar mass unitgmol-1
mass per mole of a SUBSTANCE - 11EFSimplest whole-number ratio of atoms of each element in a compound
Important for substances that don't exist as molecules, e.g. crystals - 12MFEF/Mr of compound
Number of atoms of each element in a molecule - 13Working out formula of hydrated saltsMass of anhydrous/Mr
Mass of H2O/18 - 14Assumptions made1. All H2O lost.
2. No further decomposition. - 151 mol dm-31 mole of solute in 1dm3 solution
- 16Standard solutionsDissolving a known mass of solute in solvent and making solutin up to an exact volume
- 17Steps (3)1. Work out amount of moles required.
2. Work out Mr
3. Work out mass by n*Mr - 18Vm~20'C 101kPa
Vm = 24 dm-3 at RTP
N=V/Vm - 19Ideal gas assumptions (RENN)Random motion
Elastic collisions
Negligible size
No IM forces - 20Ideal gas equationPv=nRT
Pressure (Pa)
m3
moles
8.31 J mol-1 K-1
K
As long as you know 3 of Pv/n/T/
you can work out the rest. - 21Conversionscm3->m3 *10^-6
dm3->m3*10^-3 - 22ideal gas rearrangement for TpV/nR
Room T = 19'c - 23StoichiometryRatio, in moles, of each substance.
2H2 + O2 -> 2H2O
2 mol 1 mol 2 mol - 24Percentage yieldTells you how much of the theoretical max amount of product you've attained from the reaction
actual/theoretical *100% - 25Limiting reagentReagent that's not in excess
- 26Atom economySum of desired product Mr
/
Sum of all products *100
Informações
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- O usuário eliminou as informações de disciplina FlashCards sobre Atoms, Ions, and Compounds, criado por Usuário eliminado em 19-04-2018.
- Criado por
- Usuário eliminado · abr 2018
- Atualizado
- 19 abr 2018
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- Criado por I Shouldn't be awake · 14 abr 2018
- Copiado por I Shouldn't be awake · 19 abr 2018
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