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Final Review
- 1. Significant Figures a.k.a.- sig figs
- 9. + - - - NaCl Na = Cl = H 2 O H = O = + - + Process of Solvation - + + - + + + - - + + - + - - + - + - + - + - + + - + + - + + - + + - + +
- 20. Alpha Decay Example Notice that the uranium has changed into a new element, thorium.
- 22. Beta Decay Example Notice that carbon has changed into nitrogen.
- 24. Gamma Decay Example No new element formed. Gamma radiation (energy) released.
- 27. Average Atomic Mass (How the number ends up on the periodic table!!) 1 st Mass of one isotope x % abundance in decimal form (watch SIG FIGS!!) 2 nd Do this for each isotope of that element 3 rd Add all individual isotopes together to get the average atomic mass of the element.
- 28. 1. Calculate the average atomic mass of potassium using the following data: Potassium-39 38.964 amu x 0.9312 = 36.28 amu Potassium-41 40.962 amu x 0.0688 2.82 amu = + Average atomic mass for K = 39.10 amu 6.88 % 40.962 amu Potassium-41 93.12% 38.964 amu Potassium-39 % abundance Mass Isotope
- 29. 2. Calculate the average atomic mass of magnesium using the following data: Magnesium-24 23.985 amu x 0.7870 = 18.88 amu Magnesium-25 24.986 amu x 0.1013 2.531 amu = + Average atomic mass for K = 24.31 amu + Magnesium-26 25.983 amu x 0.1117 = 2.902 amu 11.17 % 25.983 amu Magnesium-26 10.13 % 24.986 amu Magnesium-25 78.70% 23.985 amu Magnesium-24 % abundance Mass Isotope