General Questions and Answers
Physical Chemistry
GeneralWhat is the quantum symbol for the spin momentum and what does it represent
Physical Chemistry
Generalhat is the mass in g of 0 935 mol of acetone CH3COCH The molar mass of acetone is 58 08 g mol C A 0 0161 g B 54 3 g C 57 1 g D 62 1 g 50 F 8 58 PM 5 3 2022
Physical Chemistry
GeneralThe change in temperature from 10 C to 20 C is found to double the rate of particular chemical reaction How did the change in temperature affect the reaction Y A The number of molecules colliding with sufficient energy to react increased B The number of molecules colliding with sufficient energy to react decreased C The activation energy increased D The activation energy decreased
Physical Chemistry
Generallate electron configuration for the phosphide ion P3 A Ne 3s B Ne 3s 3p3 C Ne 3p D Ne 3s 3p6 Im 49 F A 9 42 PM 5 3 2022 5
Physical Chemistry
Generalsolution was made by adding 800 g of ethanol C H5OH to What is the w w C H5OH A 9 1 B 10 C 91 D 99
Physical Chemistry
GeneralWhich molecule has polar bonds but is overall nonpolar A H S B O C SO D SO3
Physical Chemistry
GeneralIf a student used a 1 5 ml of a 2M solution of BH3 in THF density of 0 876 g ml What is the mass in grams of the solution used Please show calculations
Physical Chemistry
GeneralThe most probable distribution in any system is characterized by having Select the correct answer below O maximal entropy minimal entropy O the fewest particles O the fewest microstates
Physical Chemistry
GeneralWhich two functional groups are in the molecule shown below Use the terms left and right to distinguish them H O The left functional grou right functional ge
Physical Chemistry
GeneralWhat functional group is highlighted in this section of an unknown drug Cl H The highlighted functional group is a ketc
Physical Chemistry
GeneralWhich of the following is the definition of a distribution as it relates to the microstates of a system Select the correct answer below the total number of microstates for the system O a group of microstates with equivalent particle arrangements the microstate of a system that has maximal entropy the microstate of a system that has minimal entropy
Physical Chemistry
General5 2 points One of the product of neutralization reaction is salt True False St Preous
Physical Chemistry
Generalnich sample has the largest volume The density of aluminum is 2 7 g mL and the density of copper is 9 0 g mL A 1 0 g aluminum B 5 0 g aluminum C 1 0 g copper D 5 0 g copper
Physical Chemistry
GeneralWhich of the following indicates the highest pressure Select one O a 145 000 Pa O b 1 00 atm O c O d 316 mm Hg 801 torr Oe 1 00 bar
Physical Chemistry
Generalg of KCI s is required to prepare 607 2 mL of 0 422 M KCI aq solution Please report mass to 3 significant figures
Physical Chemistry
General13 2 points Heat is the transfer of thermal energy between two bodies at different temperature True False
Physical Chemistry
GeneralDuring a reaction involving the formation of a complex ion which of the following is true when Q K Select the correct answer below The formation of the complex ion will quickly come to a halt The reactants will be favored The complex ion will dissociate into its constituent ions More of the complex ion will form
Physical Chemistry
GeneralCalculate the standard free energy change for the reaction at 25 C Refer to the list of standard reduction potentials 3 2 Au aq 3 Ni s 2 Au s 3 Ni aq
Physical Chemistry
GeneralBased on the sign of the standard cell potential Ecell classify these reactions as spontaneous or nonspontaneous as written Assume standard conditions Refer to the list of standard reduction potentials Spontaneous as written Answer Bank Nonspontaneous as written
Physical Chemistry
GeneralTwo identical gas cylinders have equivalent volumes and are filled to the same total pressure at the same temperature One cylinder is filled with pure O2 g The other cylinder is filled with an oxygen xenon gas mixture with Xo2 0 25 and Xxe 0 75 Which of the following statements is true Select one O a the mixed gas sample weighs more than the oxygen sample O b the oxygen sample weighs more than the mixed gas sample O c the two gas samples contain equivalent moles of O2 g O d the two gas samples weigh the same
Physical Chemistry
General2 points Reducing agent provides electrons to the oxidizing agent True False
Physical Chemistry
General2 points Form the following chemical equation identify the oxidizing agent and reducing agent K P s 20 g K3PO4 s a Reducing Agent Oxidizing Agent
Physical Chemistry
General20 2 points The IUPAC standard state is the conditions referring to materials under a pressure of 1 bar and solutions at 1 molar concentration True False
Physical Chemistry
GeneralCounting the number of atoms of each element in a formula is a prerequisite skill to determining the molar mass Count the number of atoms of each element in K SO4 Tap in the fields to enter the answers directly OR tap on the Number Pad icon to use our built in Number Pad Potassium K dimensions you prefer Sulfur S Oxygen 0 Tap Vi
Physical Chemistry
General30 5 points What mass in g of aluminum molar mass 26 98 g mol would be required to completely react with 5 29 L of 0 463 M HCl in the following chemical reaction 2 Al s 6HCl aq 2 AlCl3 aq 3 H g Answer to 1 decimal place Type your answer
Physical Chemistry
General27 5 points A 58 1 mL sample of a 0 101 M potassium sulfate solution is mixed with 39 7 mL of a 0 120 M lead II acetate solution and this precipitation reaction occurs K SO4 aq Pb C2H3O2 2 aq 2 KC 2H3O2 aq PbSO4 s The solid PbSO4 molar mass 303 26 g mol is collected dried and found to have a mass of 1 02 g Determine the theoretical yield in grams Answer to 2 decimal places Type your answer
Physical Chemistry
General2 points A substance dissolves in water to give yield hydroxide ions is a base True False Sh Pres hus
Physical Chemistry
General21 2 points Choose the coefficients the would balance the following chemical reaction a CH4 b Br2 c CBr2 d HBr b d
Physical Chemistry
General23 2 points Determine the oxidation state of phosphorous in the following compound K3PO3 Type your answer
Physical Chemistry
General26 5 points Molecular iodine 12 Molar mass 253 81 g mol is produced by the reaction of 8 13 g of CuCl2 Molar mass 134 45 g mol according to the following equation 2 CC2 4K 2 Cul 4 KCI 1 How many grams of l2 is produced Answer to 2 decimal places Type your answer
Physical Chemistry
General2 points If a process can be written as the sum of several stepwise processes the enthalpy change of the total process equals the product of the enthalpy changen True False revious
Physical Chemistry
GeneralPlace each reactions in the correct category a Pb NO3 2 aq H SO4 aq PbSO4 s 2 HNO3 aq b 2 Na s 2 HCl aq 2 NaCl aq H g c Mg s NiCl aq MgCl2 aq Ni s d 3 KOH aq H PO4 aq Precipitation reaction Oxidation reaction Possible answers K3PO4 aq 3 H O l No Answers Chosen No Answers Chosen a Neutralization reaction No Answers Chosen
Physical Chemistry
General28 5 points When 3 98 g of bismuth oxide molar mass 465 96 g ml reacts with excess carbon to form 2 97 g of bismuth metal molar mass 208 98 g mol according to the equation Bi2O3 s 3 C s 2 Bi s 3 CO g What is the percent yield of the reaction Answer to 1 decimal place Type your answer
Physical Chemistry
GeneralExpansion work occurs when a system push back the surrounding against a restraining pressure True False
Physical Chemistry
GeneralHeat of Formation practice e 1 Calculate AH for the following reactions using the heats of formation remember all diatomics and single elements are 0 kJ mol a 8Al s 3Fe3O4 s 4Al2O3 s 9Fe s AH 4 mol A1 203 1669 kg mol 9 mol Pe 0 kg mol 8 nol A1 0 3 mol Fe204 1670 c4 x 1669 9x 8x0 3x1670 11 686 kJ mol b CO g O2 g CO2 g AH 4x 393 5 4x 110 5 4x 110 692 kJ mol c C H2 g H2 g C2H4 8 OH 52 45 226673 217 d NH3 g O2 g NO g H O g KCI 0 KClO3 391 28 kg mol
Physical Chemistry
General35 5 points Determine the enthalpy of reaction in kJ for HCI g NaNO s HNO2 1 NaCl s Given the following thermochemical equations 2NaCl s H O l 2HCI g Na O s AH 507 1 kJ NO g NO g Na O s 2NaNO s AH 427 0 kJ NO g NO g N O g O g AH 43 01 kJ 2HNO 1 N O g O g H O 1 AH 34 02 kJ Answer to 1 decimal place ur answer
Physical Chemistry
General31 5 points Suppose a certain material has a specific heat of 0 864 J g C If 4 19 kJ of heat is applied to 344 3 g of the material at 25 2 C what is the final temperature in C of the material Answer to 1 decimal place Type your answer
Physical Chemistry
General2 2 points The net ionic equation would contain only the spectator ions True False
Physical Chemistry
GeneralThe number of protons IS the Atomic Number the sum of protons ADDED to the neutrons Mass number can vary for the same element if the element has different numbers of neutrons When this happens these forms of an element are called isotopes
Physical Chemistry
GeneralThe reactant in the oxidation half reaction is the oxidizing agent True False
Physical Chemistry
Generaldissolve dissolving dissociate dissociation ionize ionization B Iron III chlorate dissolves in water If you dissolve 2 5 x 106 formula units of Iron III chlorate in a 500 mL of water determine the number of ions that will be contained in the solution C Hydrogen combined with the halogens and some polyatomic anions to produce compounds that ionize in water that they dissolve to form ions For example hydrogen chloride HCI when dissolved in water the molecule of HCI dissociat into H cation called Hydronium ion and Cl chloride ion making a solution that is acidic The H ion is what makes the solution acidic and the solution is known as hydrochloric acid If you have 4 5 x 1015 molecules of HCI and mix it with w determine the number of H ion contained in the solution made 2 Reactivity of Metals and a reactivity series
Physical Chemistry
General1 point A unit conversion factor is the ratio of two equivalent quantities expressed with different measurement units O True False
Physical Chemistry
General1 point A balanced chemical equation must have the equal number of reactant and product molecules True False
Physical Chemistry
Generalpoint Hydrocarbons are compounds containing hydrogen oxygen and carbon True False
Physical Chemistry
General2 1 point The precision of measurements associates with the closeness to the true value of the property being measured O True False
Physical Chemistry
General1 point A mole is defined as the amount of substance containing the same number of discrete rntities as the number of atoms in a sample of pure 12C weighing exactly 12 True False
Physical Chemistry
General8 1 point Reducing agent provides electrons to the oxidizing agent True False
Physical Chemistry
General25 1 point A standard enthalpy of formation is an enthalpy change for a reaction in which exactly 1 mole of a pure substance is formed from free elements in their most stable states standard state conditions True False Breidaus
Physical Chemistry
General6 1 point The amount of product calculated per the stoichiometry of an appropriate balanced chemical equation is called the actual yield True False 200
Physical Chemistry
General1 point The property of matter that gives the distinct characteristic associates with a substance s state of matter is a chemical property O True False