PPT-Percent Composition, Empirical Formulas, Molecular Formulas

Week 22 Chemistry Warm Up 3 Minutes A certain bag of MampMs has 8 blue candies 7 red candies 4 green candies and 6 yellow candies What percentage of the bag is blue MampMs Record your Learning . . 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. 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. and Scientific Thinking . Brendan Conway. Corrine Vicari. Kaitlyn Creel. Matt Graham . Empirical Thought . Empirical thinking depends on past habit.. Based on observation and experience.. Ex. A-“It will probably rain tomorrow”. Represents the . actual. number of . atoms. of each . element. in . compound. Not necessary for . ionic compounds. Necessary for . covalent compounds. The molecular formula for water is . H. 2. O. Why Study Chemistry?. . Think about current issues in the news.. . . . . . . 2. Why Study Chemistry?. . Think about current issues in the news.. Energy sources. . . Percent Composition, . Empirical/ Molecular . Formula . Finishing Up Ch. 10. In 1811, Avogadro proposed a hypothesis:. Volumes of gases at the same temp and pressure have the same number of particles. Chapter 5: Molecules and Compounds. Learning Goals. Write . chemical formulas.. Determine . the total number of each type of atom in a chemical formula.. Classify . elements as atomic or molecular.. Classify . Compounds are ALWAYS composed of elements in fixed ratios. This is often referred to as the . Law of Definite Proportions.. This law states that elements are always present in the same proportions by mass in a compound. I.e. H. Nivaldo. J. . Tro. Chapter 6. Chemical Composition. Dr. Sylvia Esjornson. Southwestern Oklahoma . State University . Weatherford, OK. How Much Sodium? . Sodium is an important dietary mineral . that . 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.. Empirical Formula . = . consists of the symbols for the elements combined in a compound, with subscripts . showing the smallest whole number ratio. Molar mass. = . the mass in grams of 1 mole of a substance. Percent Composition. Breaks down the amount of an element in a compound by percentage. Total mass of element / total mass of compound. Result will always be a decimal. Multiply by 100 to get the final percentage. Percent Composition. ~percent by mass of atoms present in a compound. = (mass of atom). . (total molar mass) x 100. water is . 88.81 . % Oxygen and . 11.19 . % Hydrogen. O- 16.00/18.016 x 100 = . 88.81 . Introduction. How many jelly beans/pennies/peanuts/. etc. do you think is in this jar?. How can you make an educated guess and win these sort of contests?. Think of physical properties. Density. Volume.