Atoms, Ions, and Compounds

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Flashcards on Atoms, Ions, and Compounds, created by I Shouldn't be awake on 14/04/2018.
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Question Answer
Atomic Number Number of protons Number of electrons
Atomic Mass Number of protons Number of neutrons
C-12 Standard mass of 1u is 1/12th the mass of an atom of C-12
RIM Mass of an isotope relative to 1/12th the mass of a C-12 atom
RAM Weighted mean mass of an atom of an element relative to 1/12th mass of C-12 Ar Takes into account % abundance of each isotope RIM of each isotope
Determining RAM 1. 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
Determining RAM formula (%*mass)+(%*mass)/100
Polyatomic ions (2) Nitrite NO2- Sulphite SO3 2-
What is avogadro constant? 6.02*10^23 # Particles in 1 mole of C-12
Molar mass unit gmol-1 mass per mole of a SUBSTANCE
EF Simplest whole-number ratio of atoms of each element in a compound Important for substances that don't exist as molecules, e.g. crystals
MF EF/Mr of compound Number of atoms of each element in a molecule
Relative molecular mass Mr Mass of a molecule with the mass of an atom of C-12
Relative formula mass Mass of a formula unit with the mass of an atom of -12 e.g. NaCl =58.5
Working out formula of hydrated salts Mass of anhydrous/Mr Mass of H2O/18
Assumptions made 1. All H2O lost. 2. No further decomposition.
1 mol dm-3 1 mole of solute in 1dm3 solution
Standard solutions Dissolving a known mass of solute in solvent and making solutin up to an exact volume
Steps (3) 1. Work out amount of moles required. 2. Work out Mr 3. Work out mass by n*Mr
Vm ~20'C 101kPa Vm = 24 dm-3 at RTP N=V/Vm
Ideal gas assumptions (RENN) Random motion Elastic collisions Negligible size No IM forces
Ideal gas equation Pv=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.
Conversions cm3->m3 *10^-6 dm3->m3*10^-3
ideal gas rearrangement for T pV/nR Room T = 19'c
Stoichiometry Ratio, in moles, of each substance. 2H2 + O2 -> 2H2O 2 mol 1 mol 2 mol
Percentage yield Tells you how much of the theoretical max amount of product you've attained from the reaction actual/theoretical *100%
Limiting reagent Reagent that's not in excess
Atom economy Sum of desired product Mr / Sum of all products *100
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