Fundamentals for Chemistry
Fundamentals for Chemistry CH 100
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This 10 page Class Notes was uploaded by Hilario Bins on Monday October 19, 2015. The Class Notes belongs to CH 100 at Portland Community College taught by Staff in Fall. Since its upload, it has received 9 views. For similar materials see /class/224637/ch-100-portland-community-college in Chemistry at Portland Community College.
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Date Created: 10/19/15
Ch100 Fundamentals for Chemistry 1 Ch 7 Quantitative Composition of Compounds 7132010 1 You have a 2698 9 piece of aluminum a How many moles are in 2698 g of AI Ans mol of A W M 1000moAl 1 2698 g Al b How many atoms are in 2698 g of AI 23 Ans atoms of Al139000 n0l Al639022X10 atoms 6022X1023 atoms Al 1 mol c How many moles are in 500 g of AI Ans molofA M M O185molAl 1 269sgA d How many atoms are in 500 g of AI 23 Ans atoms of Al O391851m0l Aljf39ozzilrgoatoms 111X1023 atoms Al 2 You have a 2000 9 sample of chlorine gas a How many moles of Clz are in the 2000 9 sample 2000 g CI2 1 mo CI2 Ans mo Of dz 1 m 2 02821 mol CI2 b How many molecules are in 2000 g of Clz 02821 mol CIZ 1602310 molecules 1 Ans molecules of Cl2 1 699X1023 molecules Cl2 1 mol c How many CI atoms are in 2000 g of Clz 1699X1023 molecules Cl2 2 atoms Cl 1 1 molecule Cl2 Ans atoms of Cl J 3398X1023 atoms Cl d How many moles of Clz are in a 500 9 sample Ans mol of C2 w1 00705 mol CI2 39 2 e How many molecules of Clz are in 500 9 00705 mol Cl2 6022x1023 molecules 1 1 mol Ans molecules of Cl2 425X1022 molecules Cl2 Ch100 Fundamentals for Chemistry 2 Ch 7 Quantitative Composition of Compounds 7132010 3 You have a sample containing 1000 g of AICI3 a What is the molecular mass of AICI3 Ans Element Atomic of Net Molar Mass Atoms Mass N 2698 1 2698 CI 3545 3 10635 22 13333 b How many moles of AC3 are in the sample 1000 g AICI3 1 mol AICI3 1 13333 9 AICI3 gt 3 s mol of AICI3 J7500X10392 mol AICI3 c How many moles of A3 are in the sample 7500X10392 mol AICI3 1 gt 3 3 5 mol of A3 Iij7500x102 mol A3 1 AICIS d How many moles of CI39 are in the sample 2 Ans mol of cr w 3 C39 2250x10391 mol cr 1 1 AICIS e How many grams of A3 are in the sample 7500X10 2 mol AC3 2698 9 AI 1 1 mol Al Ans grams of Al 1 2024 9 Al f How many grams of CI39 are in the sample 2250x10391 mol AICISI3545 9 cr Ans grams of CI39 1 1 mol CI 17976 9 cr 4 You dissolve 2500 g of AC3 in 10 kg of deionized H20 a What is the mass percent ofAI3 and CI39 in AICI3 Ans From above the net molar mass of AI is 2698 g per 1 mole or 1333 g of AICI3 therefore AI 2698 g All 1 mol gtlt100 o 2024 or 2024 g AI3 per 100 g 1 mol 13333 9 AICI3 AICI3 The net molar mass of CI in AC3 is 10635 9 per 1 mole or 1333 g of AICI3 therefore 10635 9 All 1 mol 0 CI 1 mol 13333 9 AICIS Jx100 7976 Ch100 Fundamentals for Chemistry Ch 7 Quantitative Composition of Compounds 3 7132010 b What is the mass percent of AC3 in the whole aqueous solution including the water The mass of AC3 in the solution is just the mass of AC3 divided by the total mass of the solution 10kg 10x103g 2500 g AC3 0 AICI 0 3 10x103 9 solution jx 100 25 Note there are only 2 sig gs in this calculation c How many grams of AI3 and CI39 respectively are dissolved in solution First we need the mass of AI3 and CI39 respectively in the solution 3 mass of AI WJMJ5O6O g AI3 1000 g AICI3 mass of Cf 2500 g AICI3 10635 9 cr 1994 9 CI 1 13333 9 AICI3 d What is the mass percent of the AI3 and CI39 ions in the whole aqueous solution including the water The mass of each of the ions in the solution is 3 AI3 M x100 051 10 x 103 g solutlon 1994 9 CI39 0 cr o 10x103 9 solution x 100 20 Ch100 Fundamentals for Chemistry Ch 7 Quantitative Composition of Compounds 7132010 5 You have a flask containing 150 g of H20 volume is 150 mL a How many moles of H20 are in 150 g Ans First calculate the molar mass for HZO 1 1802 9 H20 1832 mol HZO mol of H20 MIM b How many molecules of H20 are 150 g 23 Ans molecules of H20 83932 Tel HzoIS39OZZXIE rngnlolecmesj501x1024 molecules HZO c What is the mass percent of H and 0 respectively in HZO Ans The 00 H in H20 is 00 H net mOIar mass H X100 239016 XloooDzllllgoo molar mass H20 1802 1600 1802 The 00 O in H20 is 00 0 WJX100002 1000 8879 molar mass H20 jx 0 0 d How much water in grams is needed if you need to obtain 100 grams of oxygen 100 9 01100 9 H20 113 g AM fHO 5 asso 2 1 887990 Is a metal present E gt Ionic compound gt Is the cation a Transition metal E gt Indicate the cation charge by Roman Numerals No gt Don t Use Roman Numerals o gt Does it start with H m gt Covalent NonIonic Compound gt Use Greek Prefixes E gt Is 0 present No gt Hydro ic acid E gt ate anion gt ic acid ite anion gt ous acid Ch100 Fundamentals for Chemistry page 1 of 1 Calculations in Chemical Equations 1 For the following chemical reaction you start with 153 g of CuSO4 Fill in the table Reactants I I Products CuSO4aq 2 NaOHaq CuOH2s Na2SO4aq Mole ratio 1 2 1 1 moles 00959 0192 00959 00959 Mass in g 153 762 935 136 Molar mass 15961 4000 9757 14198 2 In a chemical reaction 35x103g of C3H8 are reacted with oxygen gas producing carbon dioxide and water H in the following table Reactants I I Products C3H89 5029 3C 29 4H2 9 Mole ratio 1 5 3 4 moles 79x101 40x102 24x102 32 x102 Mass in g 35x1o3 13x104 10x104 57x103 Molar mass 4409 3200 4401 1802 3 In a chemical reaction 500 g of AgCI precipitate are produced from aqueous solutions of silver nitrate and magnesium chloride Fill in the following table Reactants I I Products 2AgN03aq MgCI2aq 2AgCIs MgN032aq Mole ratio 2 1 2 1 moles 0349 0174 0349 0174 Mass in g 593 166 500 259 Molar mass 16991 9521 14335 14833 Ch 100 Exam 3 Review Information o Exam will be given at 11 am December 8 2003 Monday in JH Room 113 o Exam will be roughly 1 hour in length o bring a scientific calculator amp a singlesided 3 x 5 sheet of notes Information Provided o Periodic Table o Table of atomic masses 0 Solubility Chart Notes Exam will cover chapters 7 and sections 8185 9192 142144 and pH lecture notes Go over assigned reading and homework as well as lecture notes Go over class worksheets the answer keys are on the classroom door Specific Study Points Ch 7 Ch 8 Ch 9 Ch 14 Also precipitation reactions amp prediction of solids formed types of chemical equations molecular complete ionic amp net ionic spectator ions describe oxidationreduction reaction classifying chemical reactions strong vs weak electrolytes the mole amp Avogadro s number calculate grams from moles calculate moles from of atomsmolecules calculate grams from of atomsmolecules calculate mass percent of element in a compound molemole relationships in chemical reactions calculate molar concentration from grams of solute dissolved in volume of solution calculate of atomsmolecules of solute in a volume of solution calculation of pH and H in acid solutions 1 Match the following scientists with their contribution to modern chemistry a Earnest Rutherford f Dmitri Mendeleev b Neils Bohr 9 Eugene Goldstein c Lord Kelvin h John Dalton d J J Thomson i James Chadwick e Robert Boyle j Galileo Galilei i The scientist to first arrange the elements into a periodic table ii The modern scientist that reintroduced the concept of the atom iii The scientist to first propose the plum pudding model of the atom iv The scientist to first propose the nuclear atom v The scientist to first propose the orbital model of the hydrogen atom vi The scientist to first discover the neutron vii The scientist to first discover the electron viii The scientist to first discover the proton ix A unit of temperature is named after this scientist x The scientist credited with inventing the scientific method 2 What are the main steps in the Scientific Method 3 What criteria defines a hypothesis as scientific 4 Unit Conversion using Greek Prefixes 5 Mass Volume amp Density 6 Heat ampTemperature the Heat equation 7 The Periodic Table 8 Atoms Molecules Isotopes and Ions 9 Atomic Mass Atomic Number and Mass Number 10 Ionic Compounds balancing charge know polyatomic ions 11 The Bohr Atom Trends in the Periodic Table 12 Chemical reactions 13 Balancing Chemical Reactions 14 The Mole ampAvogadro s Number 15 Concentration Mass Molarity pH
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