Midterm 1 Study Guide
Midterm 1 Study Guide Chem 141
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This 9 page Study Guide was uploaded by Cassidy Zirko on Saturday September 19, 2015. The Study Guide belongs to Chem 141 at University of Montana taught by Mark Cracolice (P) in Fall 2015. Since its upload, it has received 130 views. For similar materials see College Chemistry 1 in Chemistry at University of Montana.
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Date Created: 09/19/15
Study Guide for 924 midterm Chem 141 Prof Cracolice WNQP PP P NNNb Kb Kb Kb Kb Kb Kb Kb Kb Kb Ko Nr OOOOQONUIbmwr KO39 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Questions Write a proportionality that expressed the direct proportionality of distance and time What is a ratio Why do substances burn What are the rules for significant figures for multiplication and division What is a chemical property What is the Law of the Conservation of Mass What is Avogadro s Hypothesis What are the three subatomic particles and what are their charges and symbols What are the two types of ions and how do you distinguish them apart How do you change a proportionality to an equality What are the three ways to express ratios What is a hypothesis and is it always correct What are the rules for significant figures for addition and subtraction What is a homogenous mixture What is the law of definite proportions Define the law of combining volumes What is an isotope Write the names of the following formulas Xe Rn H and Au How are force and acceleration related When and where should ppm and ppb be used What is Boyles law and write the proportionality and the equation for it Round the following numbers to three sig figs a 436217g b 10624 cm3 c 52615mL d 46279 lbs Is a glass of ice water homogenous or heterogeneous Explain Define the law of multiple proportions What does Rutherford s Gold Foil Experiment suggest What are the three parts to the nuclear symbol What element is common among all acids and why is it important to the acid How many minutes are in a month There are 15 ppm of uoride in one gallon of water What is the mass in grams of the uoride in 3 gallons of water 3786L 1 gal 1000 g IL A gas has a volume of 27 cm3 and a pressure of 300 atm What will the volume be if the pressure decreases to 164 atm What is a compound made of Who formed the atomic theory and what other laws are supported by the atomic theory How was Dalton s Atomic Theory false What are the atomic numbers of the group 5B What are the five most important acids to remember How many ounces are in 1 gallon What are the 5 most common abbreviations What is Charles law and write its proportionality Find the volume of a wood block with a density of 621gml and a mass of 841 lbs How is a mixture and a compound different Study Guide for 924 midterm Chem 141 Prof Cracolice 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 Write the names of these elements a He b Pb c Al d Au e Sn f Ne A role of tin is 18 inches wide and 7 feet long It has a mass of 36 ounces and the density is 354 gcm3 What is the thickness of centimeters What are the symbols in the third period of the periodic table Write the names of the following compounds aP3N2 b N20 c SF6 d Si4S10 What is a multiple proportionality What are the corresponding symbols for the 5 most common abbreviations A gas as a volume of 423 m3 and is at a steady temperature of 25 C If the volume increases to 501 m3 what is temperature If a fixed compound of gas has the pressure tripled and the volume is increased by a factor of 7 what factor does the temperature change Prove that a compound with 291 oxygen 405 Nitrogen and 304 carbon follows the law of multiple proportions when compared with a substances with 324 Oxygen 226 nitrogen and 450 carbon Explain Millikan s Oil Drop Experiment What is the value of one atomic mass unit u How do you name a metalnonmetal compound If a cat eats 3 cans of food a day and one package holds 15 cans how many packages should last 3 months What are the multiples for the five most common abbreviations Where did the combined gas law come from and what does it allow scientists to do Significant figures are only based off on what type of number What are the atomic numbers for Lead and Krypton What are the three types of proportionalities Convert 1246 km to m If a gas has a pressure of 323 atm at a temperatures of 32 C what is the volume before the pressure increases to 426 atm and the temperature to 45 C and a volume is 453 m3 Is a freshly opened can of soda heterogeneous or homogeneous Why If you mix blue and red paint to make purple paint are you following the law of definite proportions Why or why not A student calculated that the mass of an electron during her own oil drop experiment Her results were 3210 19c 128 10Zoc6410 19c801019c481019c What is the mass of the electron and how can you tell Study Guide for 924 midterm Chem 141 Prof Cracolice 64 65 66 67 68 69 70 71 Name Nuclear Atomic Mass Protons Neutrons Electron symbol number number Z s A Phosphorous 30 18 39 28 Zinc 35 5 39C 65 Cobalt 79 79 79 78 1 17 72 What is the volume in cubic yards of a storage bin with that is 40 inches long 80 inches 73 74 80 81 82 83 84 85 with and 50 inches deep What other 2 units is one milliliter equivalent to What must you always do before you solve a problem with Charles law or the combined gas law Substance e Juice Water Carbon Iron Granite Mark each correct answer Co und Mixture What were the results of the scattering experiment What are the three steps of a quantity algebra problem What percentage of chlorine is in a solution of HCl if 67 mg of chlorine are dissolved into a 123g HCl solution What is the conversion unites between mmHg torr and atm What is a newton How many Pascal s are in 1 bar How many Pascal s in 1 atm Element Study Guide for 924 midterm Chem 141 Prof Cracolice p x 10 11 12 13 14 15 16 17 18 19 20 21 22 Answers D 0 t A ratio is the value of the part of a quantity that is divided by the total number of parts Substances burn because of a reaction with the oxygen in the air If the oxygen were to run out then the burning would stop For multiplication and division your answer should have as many significant figures as the measurement with the least amount of sig figs A chemical property is the list of chemical changes that are possible for a substance The law of the conservation of mass states that the mass of the reactants in a chemical change is equal to the mass of the products Avogadro s hypothesis states that equal volumes of gasses have an equal number of molecules The three subatomic particles are proton 1 p or p Neutron 0 n or no and electron1 e39 The two types of ions are a cation which is positive and the anion with is negative You can change a proportionality to an equality by adding a proportionality constant k The three ways to express a ratio are in a decimal form fraction or a percent A hypothesis is a prediction about the natural world that is supported by a pattern A hypothesis is never true it is only considered to be not false It requires many tests to modify a hypothesis to make it slightly less false each time The rules for significant figures for addition and subtraction is that in you answer you only have as many places after the decimal as there are in the measured quantity with the least amount of decimal places A homogeneous mixture is uniform in appearance and uniform in composition throughout the substance The law of definite proportions states that the percent by mass of the elements that make up a compound are definite fixed and invariant The law of combining volumes states that volume ratios in which gasses react are always a ratio of small whole numbers An isotope is an atom of the same element that has a different number of neutrons and different masses Xeon Radon Hydrogen Gold Force and acceleration are directly proportional F oc a Ppm and ppb should be used when you have a number or an answer that is extremely small You can multiply the answer by either a million ppm or a billion ppb to make the number more easily worked with Boyle s law states that as the volume decreases the pressure increases and as the volume increases the pressure decreases as long as it remains at a constant temperature P oc 1V I PkN so kVP a436g b106 cm3 c52600mL d462 lbs Study Guide for 924 midterm Chem 141 Prof Cracolice 23 24 25 26 27 28 29 30 31 32 33 34 35 36 It is a heterogeneous mixture because even though both ice and water are both types of water they are in two different phases and thus not uniform in composition throughout The law of multiple proportions states when two substances can react to form more than one product the amounts of one that completely reacts with a xed amount of the other is in a ratio of small whole n u m be rs The Gold Foil Experiment showed that atoms were mostly made up of empty space and that most of the mass and matter were only a small fraction of the entire atom A The Atomic number Z the mass number A and the symbol Sy 25y Hydrogen atoms are common to all acids The hydrogen atoms are important to the acid because in a reaction they will dissociate and make the acid an ion Given Month Wanted minutes month 30 days 1 month 1 day 1hour 24 hours 60 minutes 432 104 minutes Given gallons Wanted grams water 3785 L water 1 gal water 1000 g water 15 d 1 Lwater g uon e 30 gal 17gFluoride 106 g water P1 300 atm V1 27 cm3 V2 P2 164 atm P V t 27 3 Pl llzpz l2 I 1 1V23 cm496m3 P2 164atm A compound is a pure substances that can be broken down into two or more pure substances Dalton came up with the atomic theory to combine the three previous laws about atoms the law of conservation of mass law of definite proportions and the law of multiple proportions Dalton s atomic theory was disproven by J J Thompson During his experiment using a cathode ray tube he discovered that atoms could be divisible He thought that the charges of negative electricity that he detected had to be carried by smaller particles than the atom thus theorizing the presence of the electron the first subatomic particle 23 41 73 105 The five most important acids are sulfuric acid phosphoric acid chloric acid nitric acid and carbonic acid Given Gallons Wanted ounces Study Guide for 924 midterm Chem 141 Prof Cracolice 37 38 39 40 41 42 43 44 45 46 47 48 gal 4 quarts 2 pints 1 gal 2 ca 5 1 quart p 8 oz 1 pmt 10 1300z 1 cup The five most common abbreviations are Kilo centi milli nano micro Charles s law states that as the temperature increases the volume increases and as the temperature decreases the volume decreases as long as the pressure remains constant T CC V TkV VTK lbs 453592 1le 41 8 621g 2614 ml A mixture is made up of two or more chemicals while a compounds is made up of two or more pure substances a helium b lead c Aluminum d Gold e Tin i neon L 1 2 126243 cm 254 cm 18ELL 0Zllb 453592g 16 oz 3 1cm llb 354g 7ft 6 1 1 36 Na Mg Al Si P S Cl Ar a triphosphorous dinitride b dinitrogen oxide csulfur sexa uoride dTetrasilicon decasulfide a multiple proportionality is a way to express that one quantity is proportional in some way to 2 or more other variables KiloK centic milli m nanon microu T125 C273K298K V1423 m3 T2 V2501 m3 T V 2 K 1 3 zrz e 98 5 03 m 353K 273K80 C V1 423 m P2 V2 7 P1V1 P2V2 P2V2T1 P1 2Z 39 2 T1 T1221T T1 T2 P1V1 V1 Study Guide for 924 midterm Chem 141 Prof Cracolice 49 Yes it does because the ratio of oxygen is 11 the ratio of nitrogen is about 12 and the ratio of carbon is about 34 These are all small whole numbers which follows the law of multiple proportions Oxygen Nitrogen Carbon Compound 1 291 1 405 2139 304 2104 291 291 291 Compound 2 324 226 450 1 1 324 324 698 324 39 Division 1 139 104 1 199 74 1 698 139 9 50 51 52 53 54 55 56 57 58 59 60 61 Millikan used xrays to charge the drops of oil as they fell through his machine He was then able to manipulate the atom to prove the existence of electrons The value of an atomic mass unit is 1 12 of a Carbon12 atom You use a prefix to denote the number of atoms of both elements and then change the ending of the second word to ide months 30 days 1 month 3 1 dau 18 packages 15 cans 3 cans 1 package Kilo 103 centi 10392 mili10393 micro 10396 nano 10399 The combined gas law is that as pressure and volume increase temperature decreases and as pressure and volume decrease temperature will increase V CC 1p and Voc T then P1V1P2V2 T1 T2 v OCTP I VKTP KVPT I The number of sig figs in the answer is only based on MEASURED QUANTITIES 82 and 36 The three types of proportionalities are indirect direct and multiple proportionalities km 1000 m 1000 mm 1km 1246 1246109 1m P1 323 atm P2 426 atm T1 32 C273K305K T2 45 C273K 318K v1 V2453 m3 P1V1 P2V2 T1 T2 V P2V2T1 V 426atm453 m3gt1lt305K 57m3 318K323 atm 1 1 P2T2 Heterogeneous because it has the presence of both gas in the bubbles and the liquid of the soda Study Guide for 924 midterm Chem 141 Prof Cracolice 62 No because you can mix red and blue in any proportion and get different shades of purple There is no fixed amount that is universally know that makes the perfect purple 63 16 103919 because each of the measurements that the student collected was a factor of this number which suggests that this is the least common factor and the mass of the electron Name Nuclear Atomic Mass Protons Neutrons Electron symbol number number Z s A W 31 15 I 15 15 15 65 Argon g3 I I 18 21 18 66 Nickel 37 28 58 I 30 28 67 38 30 65 30 I 30 68 Copper 33 29 I 29 34 29 69 3310 27 59 27 32 57 70 Gold 133A I 197 I 118 I 71 Plutonium 1 I 195 78 I 78 1ft3 3 123831yrd 72 806840685068 10yrd3 33ft3 73 l mL l1000 dm3 1cm3 74 You must make sure to change the temperature to kelvin Substance Compound Mixture Element 75 Orange Juice X 76 Water X 77 Carbon 78 Iron 79 Granite X 80 The results who that the positive charge and how that most of the atom is concentrated in the nucleus 81 You must identify the given and wanted multiply using conversion factors and be sure to cancel the units calculate the answer and round to sig figs ClgtIlt1gCl 6710quot4gCl 1000 mg Cl 123 gsolution X X 5410 5 g100 20054 82 67 mg 83 760mmHg760torr1 atm Study Guide for 924 midterm Chem 141 Prof Cracolice 84 IN kgm 32 85 1 bar 100000Pa 1atm101325 Pa
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