Flashcards
Chemistry
Flashcards do conjunto (5)
- 1Atomic Structure Isotopes are elements with the same number of protons , different number of neutronsIsotopes have similar chemical properties because they have the same electronic configuration. They may have slightly varying physical properties because they have different masses.
- 2Relative Isotopic mass is the mass of one isotope compared to one twelfth of the mass of one atom of carbon-12Relative atomic mass is the weighted mean mass of one atom compared to one twelfth of the mass of one atom of carbon-12
- 3Relative molecular mass is the average mass of a molecule compared to one twelfth of the mass of one atom of carbon-12R.A.M = (isotopisotopic mass x % abundance) / 100
- 4Group 1 (+!) Hydrogen Silver Gold Ammonium (NH4+) Group 2 (+2) Zinc Copper (II) Iron (II) Tin Lead Group 3 (+3) Iron (III) Group 5 (-3) Phosphate (PO43-) Group 6 (-2) Carbonate (CO32-) Sulphate (SO42-) Group 7 (-1) Nitrate (NO3-) Hydroxide (OH-)Ionic equations only show the ions that are reacting and leave out spectator ions.
- 5Spectator ions are ions that are not • Not changing state • Not changing oxidation numberTake full equation
Separate (aq) solutions into ions
Cancel out spectator ions leaving ionic equation
Pb(NO3)2 (aq) + 2NaCl (aq) -->PbCl2 (s) + 2 NaNO3 (aq)
Pb2+(aq) +2Cl-(aq) -->PbCl2 (s)