Flashcards
Chapter 2 Atoms ions and compounds
Cards in this deck (24)
- 1isotopesatoms of the same element...
-same amount protons or electrons
-different numbers of neutrons
-different masses - 2atomic (proton) numbernumber protons in nucleus of atom
- 3relative isotopic mass RIMmass of an atom of an isotope compared with 1/12th of the mass of 1 atom of carbon-12
- 4relative atomic mass, Ar RAMweighted mean mass of an atom of an element compared with 1/12th mass of carbon-12
most elements mix of isotopes so weigted mm accounts 4 % abundance of each isotope and relative isotopic mass of isotope - 5relative molecular mass, Mrweighted mean mass of a molecule of a compound compared with 1/1t2h mass of 1 atom carbon-12
- 6relative formula massweighted mean mass of the formula unit of an element compared with 1/12th mass of 1 atom carbon-12
- 7use of mass spectrometry-determine relative isotopic masses
-determine relative abundances of the
isotope
-relative atomic mass of an
element from the relative abundances of its isotopes - 8use of mass spectrometer to work out RAM-works out %abundance of isotopes in sample of element
-place sample in mass spectrometer
-vaporise then ionise sample: form +ions
-ions accelerated
-heavier ions move slowly & harder to deflect than lighter ions
-so ions of each isotope seperated
-detected as mass to charge ratio m/z - 9mass spectrum of chlorine
- 10determination of RAM calculation E.G chlorinechlorine 35 has abundance 75.78%
chlorine-37 has abundance 24.22%
(75.78 x 35)+(24.22 x 37)/100
=35.4844 =35.5 (1dp) - 11trends of ionic charge
- 12polyatomic ionsion contains more than 1 element bonded together
- 13nitrate ionNO3–
- 14hydroxide ionOH-
- 15hydrogencarbonate ionHCO3 -
- 16manganate V11 (permanganate) ionMnO4 -
- 17carbonate ionCO3 2-
- 18sulfate ionSO4 2-
- 19sulfite ionSO3 2-
- 20dichromate VI ionCr2 O7 2-
- 21phosphate ionPO4 3-
- 22ammonium ionNH4 +
- 23silver ionAg+
- 24zinc ionZn 2+
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- A level Chemistry (Module 2 Foundations in Chemistry) Flashcards on Chapter 2 Atoms ions and compounds, created by Mehak Zahrah Faheem on 24/11/2018.
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- Mehak Zahrah Faheem
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