Chemistry concepts and calculations

1. Beer\'s law allows us to convert absorbance to concentration (molarity). a. T

1. Beer's law allows us to convert absorbance to concentration (molarity). a. True b. False 2. Why should we leave the top closed when scanning light in the colorimeter probe? a. …

1. Below is a Java program intended to produce a GUI with two buttons. Each butt

1. Below is a Java program intended to produce a GUI with two buttons. Each button should change colors when pressed. Cut and paste this code into an editor to work on it. You can…

1. Below is a graph of three distillations that were performed to separate liqui

1. Below is a graph of three distillations that were performed to separate liquids A and B, with the cumulative volume (x-axis) plotted versus the heat temperature (y- axis). The …

1. Below is the scheme known as the central dogma. Each of the arrows (A, B, C)

1. Below is the scheme known as the central dogma. Each of the arrows (A, B, C) represents a 10.3UAM, total points: 50 (extra 2 points) particular process in gene expression. A, B…

1. Below what temperature does the following reaction become nonspontaneous? 2 H

1. Below what temperature does the following reaction become nonspontaneous? 2 HNO3(aq) + NO(g) ? 3 NO2(g) + H2O(l) ?H = +136.5 kJ; ?S = +287.5 J/K (A) 39.2 K (B) 151 K (C) 475 K …

1. Besides esters, essential oils may be a complex mixture of components that us

1. Besides esters, essential oils may be a complex mixture of components that usually belong to one of two groups of natural products. What are these two groups? (2 pts) and 2. Th…

1. Beta sheets come in two major flavors: parallel and anti-parallel. Which of t

1. Beta sheets come in two major flavors: parallel and anti-parallel. Which of these types of beta sheets, typically, creates the most "local" interactions? a)Parallel b)Antiparal…

1. Binding energy per nucleon in a nucleus is... a. the same for all nuclei b. t

1. Binding energy per nucleon in a nucleus is... a. the same for all nuclei b. the greatest for the largest nuclei c. the greastest for medium-sized nuclei 2. Of the following con…

1. Binomial coefficients (n m) = n!/m!(n - m) are defined for all integers n geq

1. Binomial coefficients (n m) = n!/m!(n - m) are defined for all integers n geq 0 and 0 leq m leq n. With the definition b(n, m) = (n m ), the recurrence b(n, m) = b(n - 1, m - 1…

1. Biomass, the largest of the renewable energy sources, accounted for how much

1. Biomass, the largest of the renewable energy sources, accounted for how much US Energy in 2014? a. 44.25 quadrillion BTU b. 25 quadrillion BTU c. 10 quadrillion BTU d. 9.6 quad…

1. Bisphenol A is a plasticizer widely used in polycarbonate water bottles and l

1. Bisphenol A is a plasticizer widely used in polycarbonate water bottles and liners in metal food cans. A plasticizer is a chemical blended with plastic polymers to make the pla…

1. Bleaches act on stains by: a. removing electrons during the oxidation process

1. Bleaches act on stains by: a. removing electrons during the oxidation process. b. reducing the colored compound by adding electrons. c. exciting electrons to move between energ…

1. Blood is composed of plasma (a clear fluid with various proteins and ions) an

1. Blood is composed of plasma (a clear fluid with various proteins and ions) and cells (the overwhelming majority of which are RBCs). The hematocrit (volume fraction of cells) in…

1. Boiling point of a liquid mixture depends on the following property? a) elect

1. Boiling point of a liquid mixture depends on the following property? a) electronegativity b) material of the container c) size of the container …

1. Bonding patterns are most directly determined by: A. Electrons and their orbi

1. Bonding patterns are most directly determined by: A. Electrons and their orbitals B. Neutrons C. The atomic nucleus D. Photons 2. Density is most directly determined by: A. Ele…

1. Both cellulose and starch are natural polymers derived from glucose, but poss

1. Both cellulose and starch are natural polymers derived from glucose, but possess significantly different properties. Explain these differences on a molecular level. (2 points) …

1. Both the reactant and the product of the reduction reaction are considered re

1. Both the reactant and the product of the reduction reaction are considered renewable materials .... a) Explain the difference of renewable and non-renewable resources, and b) D…

1. Breathing in mammals is a result of the buildup of CO2 as they do not have di

1. Breathing in mammals is a result of the buildup of CO2 as they do not have direct physiological sensors for p02. Skindivers often hyperventilate (breath rapidly and deeply) for…

1. Briefly expalin why a) you shoulf not heat organic solvents over a Bunsen bur

1. Briefly expalin why a) you shoulf not heat organic solvents over a Bunsen burner flame b) you should add activated carbon to a cool solution and then heat the mixture to boilin…

1. Briefly expalin why you should not add boiling chips to a boiling liquid? 2.

1. Briefly expalin why you should not add boiling chips to a boiling liquid? 2. Briefly explain how and why you should position the thermometer in the distillation head during a d…

1. Briefly explain (a) Why atomic absorption lines are very narrow? (b) Why atom

1. Briefly explain (a) Why atomic absorption lines are very narrow? (b) Why atomic emission is more sensitive to flame instability than atomic absorption? (c) Why fluorescence mea…

1. Briefly explain why it is necessary to analyze more specimen of the drain cle

1. Briefly explain why it is necessary to analyze more specimen of the drain cleaner . 2 Briefly explain why three titrations are carried out for the solution of each specimen of …

1. Briefly explain why it is necessary to analyze more specimen of the drain cle

1. Briefly explain why it is necessary to analyze more specimen of the drain cleaner . 2 Briefly explain why three titrations are carried out for the solution of each specimen of …

1. Briefly explain why it was not necessary for you to determine the mass of unk

1. Briefly explain why it was not necessary for you to determine the mass of unknown liquid that you transferred to the flask before heating. 2. Would the molar mass of a volatile…

1. Briefly explain why it was not necessary for you to determine the mass of unk

1. Briefly explain why it was not necessary for you to determine the mass of unknown liquid that you transferred to the flask before heating. 2. Would the molar mass of a volatile…

1. Briefly, explain how the following procedural errors would affect the calcula

1. Briefly, explain how the following procedural errors would affect the calculated mass percent of NaHCO3 in an NaHCO3 -NaCl mixture. (a). A student, rushing to complete the mixt…

1. Bromine is produced in a series of chemical steps: i) H + + Br - + NaOCl = HO

1. Bromine is produced in a series of chemical steps: i) H+ + Br- + NaOCl = HOBr (hypobromous acid) + NaCl ii) H+ + Br- + HOBr = Br2 + H2O Give the net balanced reaction equation …

1. Bromobenzene would have an IR band due to the presence ofBr at what location?

1. Bromobenzene would have an IR band due to the presence ofBr at what location? 2. How does an anhydride differ from anacid? Anhydrides are neutralized acids. Anhydrides are two …

1. Buffer Problem... calculate the pH of the buffer and then the pH after adding

1. Buffer Problem... calculate the pH of the buffer and then the pH after adding a base to 50.0 mL the buffer. Which pair of solutions can be mixed together to form a buffer? Circ…

1. Building on the \'state variable\' methods we developed last week, let\'s con

1. Building on the 'state variable' methods we developed last week, let's consider a substrate (e.g. a 'big' molecule) that can bind up to two, identical small molecules in soluti…

1. Burned steel wool (pure Fe) becomes a dark comp 3.50 ound referred as iron ox

1. Burned steel wool (pure Fe) becomes a dark comp 3.50 ound referred as iron oxide. By burning 8 of steel wool, 5.00 g of a final product (rust) is obtained. What is the mass per…

1. Butane, C4H10, reacts with oxygen, O2, to form water, H2O, and carbon dioxide

1. Butane, C4H10, reacts with oxygen, O2, to form water, H2O, and carbon dioxide, CO2, as shown in the following chemical equation: 2C4H10(g)+13O2(g)10H2O(g)+8CO2(g) Calculate the…

1. By hydrogenation of CH(CH-):CH CHO which of the following compounds is produc

1. By hydrogenation of CH(CH-):CH CHO which of the following compounds is produced? a. 1,1-dimethyl-3-propano b. 2-methyl-4-butanol C 3-methyl-1-butanol d. 3,3-dimethyl-1-propanol…

1. By marking yes (Y) or no (N) in the space provided, specify which of the foll

1. By marking yes (Y) or no (N) in the space provided, specify which of the following criteria are met by a good solvent for a recrystallization. _______a. The solutes are soluble…

1. By what amount is the boiling point elevated when 153 g propanetriol (C3H8O3)

1. By what amount is the boiling point elevated when 153 g propanetriol (C3H8O3) is added to 1.5 L acetic acid? (daa = 1.32 g/mL) (Acetic acid: Kb = 3.07 degrees C/m and BP = 118.…

1. C 2 H 2 (g) + 5/2 O 2 (g) à 2 CO 2 (g) + H 2 O(l) H = -1299.5 kJ C(s) + O 2 (

1. C2H2(g) + 5/2 O2(g) à 2 CO2(g) + H2O(l) H = -1299.5 kJ C(s) + O2(g) à CO2(g) H …

1. C catalyst will cause m points) onsider the reaction A + B , C. The reaction

1. C catalyst will cause m points) onsider the reaction A + B , C. The reaction has reached equilibrium. Addition of a to be formed. (True or False) If the answer is false, explai…

1. C diffuses interstially in Fe whereas Cr would mainly diffuse in Fe through v

1. C diffuses interstially in Fe whereas Cr would mainly diffuse in Fe through vacancy diffusion. Therefore, the activation energy for C diffusion in Fe is _________________ than …

1. CH3CH2COCHCHCH2CN: Which orbitals overlap to form the sigma bond indicated? (

1. CH3CH2COCHCHCH2CN: Which orbitals overlap to form the sigma bond indicated? (The arrow in the picture points to the triple bond between C & N) A) sp2-sp2 B) sp-sp C) sp3-sp…

1. CHM 2046L Assignment 2 unknowns may contain any of these: -2 HSO4 S04 (a) whi

1. CHM 2046L Assignment 2 unknowns may contain any of these: -2 HSO4 S04 (a) whichf the se would have an effect on the pH of a lution of an unknown? What pH is expected (assuming …

1. CONSIDER ONLY THE NET IONIC EQUATION a) Write the reaction between H2SO4(aq)

1. CONSIDER ONLY THE NET IONIC EQUATION a) Write the reaction between H2SO4(aq) and Mg(NO3)2(aq) b) Write the reaction between H2SO4(aq) and Ba(NO3)2(aq) c) Write the reaction bet…

1. Calcium Fluoride, Ksp=3.9x10^-11 CaF2->Ca^2+ + 2F- How would the addition of

1. Calcium Fluoride, Ksp=3.9x10^-11 CaF2->Ca^2+ + 2F- How would the addition of an acid effect the solubility if Calciu Fluoride? 2. Lead II Bromide, Ksp=1.86x10^-5 PbBr2->P…

1. Calcium carbonate (a weak base) reacts with nitric acid (a strong acid) quant

1. Calcium carbonate (a weak base) reacts with nitric acid (a strong acid) quantitatively in the following reaction to form calcium nitrate, water and carbon dioxide: How many kg …

1. Calcium hydride, CaH2, reacts with water to form hydrogen gas: CaH21s2+2 H2O1

1. Calcium hydride, CaH2, reacts with water to form hydrogen gas: CaH21s2+2 H2O1l2¡Ca1OH221aq2+2 H21g2 This reaction is sometimes used to inflate life rafts, weather balloons, and…

1. Calcium oxalate monohydrate, CaC2O4•H2O, is stable up to ~100C, but will rele

1. Calcium oxalate monohydrate, CaC2O4•H2O, is stable up to ~100C, but will release the incorporated water molecule when heated to 300C, according to the following reaction: CaC2O…

1. Calcium oxide, Cao(s, has been proposed substance that can be used to heat wa

1. Calcium oxide, Cao(s, has been proposed substance that can be used to heat water quickly for portable as a equation above. heating packs or for cooking. When placed in water, C…

1. Calcium phosphate has a Ksp of 2.07x10^-33. Determine: a)The molar solubility

1. Calcium phosphate has a Ksp of 2.07x10^-33. Determine: a)The molar solubility of calcium phosphate. b)The molar concentration of calcium ions at equilibrium. c)The molar concen…

1. Calculate Delta H rxn ( H rxn) for the combustion of acetylene: 2 C 2 H 2 (g)

1. Calculate Delta H rxn (Hrxn) for the combustion of acetylene: 2 C2H2 (g) + 5 O2 (g) --> 4 CO2 (g) + 2 H2O (g) 2. An experimental fuel is a mixture of 83% ethanol and 17% gas…

1. Calculate K Calculate K_c for the reaction 2HI(g) H_2(g) + I_2(g) given that

1. Calculate K Calculate K_c for the reaction 2HI(g) H_2(g) + I_2(g) given that the concentrations of each species at equilibrium are as follows: [HI] = 0.85 mol/L, [I_2] = 0.60 m…

1. Calculate Ke for the reaction SnO2(s) 2CO(g) Sn(s) 2CO2(g) + + given the foll

1. Calculate Ke for the reaction SnO2(s) 2CO(g) Sn(s) 2CO2(g) + + given the following information: SnO2(s) H2(g) + 2H:(g)Sn(s) + 2H20(g) CO2(g) H2O(g) + CO(g) Ke 8.12 Ke-0.771 2. …

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