PPT-Percentage composition and empirical formulae

Objectives To learn how to work out the percentage composition by weight of a compound To use percentage composition to work out empirical formulae Percentage compositions This means what percentage of each element is present in a compound and therefore tells you what masses of each element are present in any given mass of a compound . No CoursesClass Percentage General Percentage OBC Percentage SC Percentage ST Percentage PWD Remarks 1 BA Ist year 88 and above in agg 85 and above in agg 85 and above in agg 85 an Lesson 28. Warm up. Submit Mole Conversion packages in basket, and copy the following upon arrival. Write-Pair-Share. What is the percent of the total composition of each ingredient in the following recipe (masses are fictitious):. Week 22 Chemistry. Warm Up: . 3. Minutes. A certain bag of M&M’s has 8 blue candies, 7 red candies, 4 green candies, and 6 yellow candies. What percentage of the bag is blue M&M’s? . Record your Learning . August 2011. Pythagoras c. 2. = a. 2. + b. 2 . where c is the hypotenuse = the longest side. Pythagoras. . c. 2. = a. 2. + b. 2 . . so c = (a. 2. + b. 2 . )^0.5. a. 2. = c. 2. - b. 2 . ( General ) Percentage ( OBC ) Percentage ( SC ) Percentage ( ST ) Percentage ( PWD ) 1B.A. Ist year91% and above in agg.90% and above in agg.89% and above in agg.89% and above in agg.89% and above in . Datang. 欢. 迎. Vaazhga. Welcome. Professor David Wray. University of Warwick,. United Kingdom. Dr Dahlia . Janan. Universiti. . Pendidikan. Sultan . Idris. , Malaysia. Many thanks for coming to today’s meeting. Objectives. To learn how to write formulae for compounds. Outcome: you should be able to write the formulae for inorganic covalent compounds and ionic compounds comprising single atom ions or polyatomic ions.. The Mole. REVISION. Formulae tell you how many of each atom are in a molecule.. Different atoms have different masses.. Level 4. NEW LEARNING. Formulae and balanced equations. Formula Mass and the mole. 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. In a group, calculate the percentage of flasks, owls, . Marios. , pencils & stars. What if this was related to mass? Calculate the % by mass for each of the objects.. 100 g. 20 g. 5. 0 g. 2 g. 6. The Mole. Chemist’s counting number. amount. of a substance . 1 mole is equal to 6.022 x 10. 23. atoms or particles or molecules (Avogadro’s number). There are always 6.022 x 10. 23 . particles in . 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.. Objectives:. -         . The student will determine an empirical, or simplest, formula from percentage composition data..  . PA Science and Technology Standards: 3.4.10.A; 3.4.12.A. PA Mathematics Standards: 2.2.11.A, 2.3.11.C, 2.4.11.E, 2.5.11.A. 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 .