PPT-Molecular Formula

vs Empirical Formula Different compounds can have the same empirical formula but different molecular formulas Empirical Formula is a reduced form of Molecular formula Molecular Formula and Empirical Formula. Structural Formula Molecular Formula 16 13 ClN O Molecular weight 28474 CAS registry number 439 14 DESCRIPTION Diazepam is a benzodiazepine derivative It is a colourless crystalline compound insoluble in water PHARMACOLOGY Pharmacokinetics Absoprtio Over the past decade an ever growing arsenal of techniques has helped researchers dissect the innermost secrets of the cell and develop new ways to detect and attack disease These techniques also have been used to produce vast amounts of once rare d This PowerPoint . was adapted from . http://. www.purplemath.com/modules/quadform2.htm. and . http://. teachers.henrico.k12.va.us/math/hcpsalgebra2/Documents/6-4/2006_6_4.ppt. Looking Back…. In our previous lesson, we solved quadratic function by . Q- a compound is found to contain the following % by mass: 69.58% Ba, 6.090% C, 24.32% O. What is the simplest (i.e. empirical) formula?. Step 1. : imagine that you have 100 g of the substance. Thus, % will become mass in grams. E.g. 69.58 % Ba becomes 69.58 g Ba. (Some questions. You should know this for the quiz!. Empirical and Molecular Formulae. Empirical Formula. If needed, change % to g.. Do . a molar conversion to change from . g. mol. Divide each of these numbers by the smallest number. Do Now: from last years regents. Chemical Formulas. Tell . type. & . number. atoms in compound. Microscopic level: . Formula gives atom ratios. Macroscopic level: . Formula gives mole ratios. EXAMPLE. new subject appears twice. www.waldomaths.com. Copyright © . R F Barrow. . 2010, all rights reserved. Make . x. the subject of this formula. Make . x. the subject of this formula. Make . x. the subject of this formula. RO-INMED 2015. Cercet. a. tor . stiintific. . ing. .. Alexandra-Daniela BALTAC . –consultant . extrasenzorial. . D. r Angelica-Cornelia NOICA-DUMITRESCU. Chemistry GT 3/20/15. Drill. Calculate the percent composition of Na. 2. SO. 4. .. HW: Molecular Formula WS (pg. 4). MM. =142.05 . g. /mol. 32.37% Na, 22.58% S, 45.05% O. Chem. Joke of the Day. The photon checked into a hotel. What did it say when the bellhop asked for its bag?. Vocabulary. Discriminant - tells you how many solutions and what type you will have.. If the . discriminant is. . positive . – 2 real solutions. . negative . – 2 imaginary solutions. . zero . – 1 real solution. Percent Composition. Percent . Composition – . the . percentage . by mass of . each . element in a . compound (*note: not the ratio of elements in the compound). Law of Definite Proportions . – compounds always contain the same proportions of elements by mass.. Unit 3 – Stoichiometry. Which element does the PES spectrum above represent?. Draw the Bohr Model of this element.. Is there anything in the PES data for this element that requires revision of the Bohr model? . I. Percent Composition. Think about this:. How would you find the percent of boys in our class?. # of boys (part)____. x 100% . Total # of students (whole). I. Percent Composition. . Lowest whole # ratio . H. 2. O. 2. (hydrogen peroxide) is it a empirical Formula?. No, you can reduce it to HO . . H. 2. O. 2 . is the molecular formula. Molecular formula shows the way the molecule is actually found in nature..