Choose any alkali metal from the periodic table. In a paragraph and in your own words, please describe what the Bohr model of a neutral atom of this element looks like. Then describe what happens when neutral atoms of this alkali metal are introduced to water for the first time compared to other alkali metals . Use the following terms : NUCLEUS, PROTONS, ELECTRONS , ENERGY LEVEL/SHELL, NEUTRONS VALENCE ELECTRONS , IONIZATION ENERGY , GROUP 1, ELECTRON TRANSFER , ELECTROSTATIC REPULSION

The pressure inside a hydrogen-filled container was 2.10 atm at 21 ? c. what would the pressure be if the container was heated to 92 ? c ?

A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.