Chemistry Questions and Answers April 27, 2020

When 1.23 g of menthol is dissolved in 5.00 mL of ether and placed in a sample cell 10.0 cm in length, the observed rotation at 20C (using the D line of sodium) is 0.54. Calculate the specific rotation of menthol. O 44 4.4 O 2.2 O 0.22 Question 4 Calculate the enantiomeric excess of a mixture of 2 bromobutanes with an observed rotation of 18.5.

These two compounds are CH3 CH3 O identical O chiral diastereomers O meso Question 6 These two compounds are O identical O diastereomers constitutional isomers chiral

The octane rating of gasoline is a relationship of the burning efficiency of the given gasoline mixture to the burning efficiency of octane (C8 H18). (Figure 1)Like most hydrocarbons, octane reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is C3 H18 (9) O2 (9)CO2 (9) H2O(g) ,Balanced chemical

The HaberBosch process is a very important industrial process. In the HaberBosch process, hydrogen gas reacts with nitrogen gas to produce ammonia according to the equation 1.92 g H2 is allowed to react with 9.68 g N2, producing 2.01 g NH3. 3H2(g) N2(g)2NH3(g) The ammonia produced in the HaberBosch process has a wide range of uses, from

Part B What is the final volume in millilitres when 0.761 L of a 31.2 (mv) solution is diluted to 23.0 (mv) Express your answer numerically in millilitres. View Available Hint(s) V mL Submit Part C A 677 mL NaCl solution is diluted to a volume of 1.41 L and a concentration of 8.00 mol L1. What was the initial concentration Express the molar

What is the concentration of Kt ions in a 0.045 M K2CO3 solution assuming complete dissociation Express the concentration in molarity. View Available Hint(s) concentration of Kt 0.050 M 3D

the mechanism for the formation of potassium tris(oxalato)ferrate(III) trihydrate, K 3 [Fe(ox) 3 ] . 3H 2 O from the reaction between ferric nitrate nonahydrate and potassium oxalate monohydrate.

Use the equipartition principle to calculate Cp for a) N 2 b) CO 2 c) SO 2 d) CH 4 in gas phase. First, consider the molecules as rigid, then classically vibrating. The solutions should be in J/(K mol): For rigid: a) 29.1; b) 29.1; c) 33.3; d) 33.3. For vibrating: a) 37.4; b) 62.4; c) 58.2; d) 108

Each transformation uses the same catalyst, propose a mechanism for each one. (B) OMe OMe 113 (15 mo) HCI (25 mos) F3 4A MS, TBME 30 C. 48 h tBu S 114 CF3 115 (C) AF 113 113 (10 mo) 4NOSA (7 mo) SBn CIC 4A MS, PhMe 30 C. 12 h NH Ph (1)116 118

A sample of warm moist air (100 % relative humidity) is collected in a container at p = 759.9 Torr and T = 30.0 o C. The vapour pressure of water at this temperature is 31.8 Torr. Find the concentration in grams per litre of water vapour in the original air sample.

18 A frictionless pistoncylinder device contains 2 kg of nitrogen at 100 kPa and 300 K. Nitrogen is now compressed slowly according to the relation PV reaches a final temperature of 360 K. Calculate the work input during this process. Answer. 89 kJ constant until it PV const. FIGURE P418

Determine the mass of copper and the percent copper in salt. I\'ve been given the mass of copper salt and mass of copper (ii) oxide Mass of Copper Salt: 1.9952g Mass of Copper (ii) Oxide: 0.3955g

Compute the buffer intensity, b, of a 10 -1 M (= C T ) acetic acid solution at pH 5 and pH 7. For each pH determine the individual contributions of the acetic acid (b HAc ) and of water (b H20 ) to the total buffer intensity (b).

The questions on the quiz will reference the following reaction When siver ntrate and sodium iodide are mixed in aqueous solution, they participate in a precipitation reaction to produce a cream colored precipitate of srer odde (This is a zeropoint question, simply mark true below and move to the fint question of the quie) True O False QUESTION 2

Common discovery tools in civil litigation include: a. interrogatories. b. depositions. c. document demands. d. all of the above. Parties to a civil dispute are free to negotiate a settlement of their dispute: a. at any time. b. only before a lawsuit is commenced. c. after commencement of a lawsuit, but, then, only through arbitration. Beavis and

2.) What is the mechanism and main product for the following reaction r N

Provide the IUPAC name for the following molecule.

HCHC H... O,HCHC

Atomic number two elemen Yand The are 19 qnd 8 aue respectivelp they xt and yz to kepresented stte J The electronic Conpigura lion I elentify erte e lement Xcud The oxandg electrons in each Yon and number Is x s a metal Answer or nonmetal

How would you prepare 2.48 L of a 5.00 mol L1 solution from a 13.0 mol L1 stock solution View Available Hint(s) Dilute 0.954 L of the 5.00 mol L solution to 2.48 L. Dilute 2.48 L of the 13.0 mol L solution to 3.27 L. Dilute 0.954 L of the 13.0 mol L solution to 2.48 L. Dilute 2.48 L of the 5.00 mol L solution to 3.27 L.

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol Express your answer with the appropriate units. Part B Before investigating the scene, the technician must dilute the luminol solution to a

4. Determine the hybridization of the atoms in the following compounds and use the information to draw the complete bonding orbital picture. a. HCOH b. CNMe 5. Determine the magnitude and direction of the molecular dipole moments in the following molecules. b. Cs2 C. AICI3

HBr warm NC. CN heat

1 Draw a more stable resonance form for the structure provided. Use curved arrows to show the flow of electrons. Why is your structure more stable CH3 QUESTION 2 because it consists only of carbon and hydrogen atoms, but it is negatively charged and remarkably stable. Explain why this compound is so stable, and support your answer with additional

The bovine agnoprotein has the following sequence MetAla LeuGlnTrpValTrp LeuCysLeu Part A Write the sequence using the oneletter abbreviations.

if you dilute 100 ml of a 1 mM HCL solution with 400 ml of water, what would you predict the new PH to be

What volume of water must be added to 14.4 mL of a pH 2.0 solution of HNO3 in order to change the pH to 4.0?

The thermochemical equation for the formation of ammonia from elemental nitrogen and hydrogen is as follows. N 2 (g) + 3 H 2 (g) 2 NH 3 (g) H = 92.2 kJ Given a system that is initially at equilibrium, which action causes the reaction to proceed to the left?

Given the equilibrium constants for the equilibria, H2O(l) H3O+(aq); K = 2CH3COOH(aq) + 2H2O(l) 2CH3COO(aq) + 2H3O+(aq); K = Determine Kc for the following equilibrium. CH3COOH(aq) + NH3(aq) CH3COO(aq) + NH4+(aq)

A mixture of nitrogen and hydrogen was allowed to come to equilibrium at a given temperature. 3H2 + N2 2NH3 An analysis of the mixture at equilibrium revealed 2.1 mol N 2, 2.8 mol H 2 , and 1.8 mol NH 3 . How many moles of H 2 were present at the beginning of the reaction?

When 1.0 mole of acetic acid is diluted with water to a volume of 1.0 L at 25 C, 0.42% of the acetic acid ionizes to form acetate ion and hydronium ion. CH3CO2H(aq) + H2O() CH3CO2(aq) + H3O+(aq) What percentage of the acid ionizes when 0.75 mole of acetic acid is diluted with water to 1.0 L at 25 C?

Write a net ionic equation for the neutralization reaction of hydrochloric acid and potassium hydroxide. Identify the spectator ion(s).

At 25 C, the decomposition of dinitrogen tetraoxide N2O4(g) 2 NO2(g) has an equilibrium constant (Kp) of 0.144. At equilibrium, the total pressure of the system is 0.0758 atm. What is the partial pressure of each gas?

What is the OH concentration of an aqueous solution with a pH of 9.83? (Kw = 1.01 1014)

QUESTION 9 Molecules or ions that can alternately behave as either a Brnsted-Lowry acid or base are called

For the equilibrium PCl5(g) PCl3(g) + Cl2(g), Kc = 4.0 at 228C. If pure PCl5 is placed in a 1.00-L container and allowed to come to equilibrium, and the equilibrium concentration of PCl5(g) is 0.19 M, what is the equilibrium concentration of PCl3?

What is the % concentration when when 20.0 mL half & half is mixed with 100. mL of coffee?

With the given gas mixture calculate the gas mixture lower heating value. CH435949.1kJm3 C2H664615.7kJm3 C3H893910.3kJ.m3 CH4 r0.8 C2H6 r0.01

Summarize the major physicochemical properties of small molecule drugs and how each of these will affect distribution. Explain the result of increasing clearance rate on half-life.

3.21. At 100 C 200 g of mercury are added to 80 g of water at 20 C in a vessel that has a water equivalent of 20 g. The specific heat capacities of water and mercury i may be taken as constant at 4.18 and 0.140 J K respectively. Calculate the entropy change of (a) the mercury (b) the water and vessel (c) the mercury, water, and vessel together.

Consider an activated sludge treatment plant with an average daily flow rate of 20,000 m3/day. The untreated wastewater contains 200 mg/L suspended solids and 250 mg/L COD. The plant provides 60% removal of suspended solids and 30% removal of BOD5 in the primary clarifier. The primary sludge contains 5% solids and is 65% volatile. The activated

Which of the following statements about the species N2, CO, CN, and NO is false All are isoelectronic. O The bond in each species is ionic. Each contains a triple bond. O All are linear.

Which compound does not contain both polar covalent and ionic bonds KOH O CHOH O CsC,H3O2 O Ca(CN)2 O NHCIO,

Test for aluminum: Al^3+(aq) + 3NH3(aq) + 3H2O(l) + aluminon ---> Al(OH)3 * aluminon(s) + 3NH4^+(aq). 1a)How many grams of H2 gas were produced assuming the aluminum metal reacted completely? (Assume theres 1.25 g of Aluminum metal) Test for sulfate: Barium ion reacts with sulfate to form an insoluble compound. Let KAl(SO4)2 * 12H2O react with

Given: the atomic mass of calcium is 40.1 g/mole, and the atomic mass of chloride is 35.5 g/mole. What % solution is a 1 M CaCl, solution? a) 11.1% b) 0.11% c) 0.04% d) 33.3% e) 0.33%

A solution with 1.0 M glucose and 0.5 M CaCl, solution has a total osmolarity of: a) 2.0 OsM b) 5.0 OsM c) 2.5 OsM d) 3.5 OsM e) 1.5 OsM

What will happen when the condensate reaches the thermometer bulb? Why does that happen?

57. Compute the mass in grams of (a) one CO, molecule (b) one C6H12O6 (glucose) molecule (c) one CaCl, formula unit

The property of being a basic solution depends on the representation (the system of linear equalities and inequalities) that defines a polyhedron. O True O False

Polyoxymethylene burns in a mixture of 12 % oxygen by mass and nitrogen is present. Assume it burns purely convectively with a heat transfer coefficient of 8 W/mK. Find in m^n? Given: Polyoxymethylene properties: Tx = 20C T = 300C L = 2.4 kJ/g Ahox = 14.5 kJ/g 02

The standard heat of formation of solid potassium permanganate is 813.4 kJ. Write the chemical equation for the reaction to which this value applies.

Give the number of protons ,neutrons and electrons in the following species 31P^3- ion?

Select the potential energy diagram that corresponds to the decomposition of ozone II IV E, Reaction Path Reaction Path Reaction Path Reaction Path Select an answer and submit. For keyboard navigation, use the updown arrow keys to select an answer. a b II IV Select the expression for the rate law that corresponds to the second step of the

A 1. CH,COCI, AICI, 2. NH,NH, cat. H 3. , ,. 90

Consider the compound C 3 H 8 O. If 1.00 mol of the compound is submitted to combustion analysis, how many moles of CO 2 and how many moles of H 2 O would be formed?

Assuming that the analysis is complete for the groundwater described in the table below, estimate a. [6 marks] the pH of the sample assuming a temperature of 25C b. [4 marks] the alkalinity of the sample (in mg/L as CaCO3) c. [4 marks] the hardness of the sample (in mg/L as CaCO3) d. [2 marks] the non-carbonate hardness of the sample Parameter

Draw a very creative and artistic chemical structure model of Penicillin. Preferably, include some cartoons in your work as well

Table 3. Benzyl alcohol R values and Eluent Compositions Rf value Eluent composition 15 Ethyl Acetate 85 Hexanes Eluent 0.625 A 60 Ethyl Acetate 40 Hexanes 0.4 30 Ethyl Acetate 70 Hexanes 0.5 B. ,9. The eluents are made up of ethyl acetate and hexane according to the compositions below. i. 60 Ethyl Acetate 40 Hexanes ii. 30 Ethyl Acetate 70

Ayurveda is a fom or medcine practiced in India. In one study, 20 of U.S. and Indianmanufactured Ayurvedic medicines purchased through the Internet in 2005 contained detectable levels of several toxic clements. Identify as many peaks as you can in the Xray fluorescence spectrum of the Ayurvedic medicine. Use a question mark (7) for peaks that

Use the room temperature (25 C) thermodynamic equilibria and data listed below to plot the EpH diagram for the CdH0 system in the presence of 10 activity (10 m) of dissolved cadmium species. Use a scale of 10 mmpH unit and 50 mmV. Label the regions of corrosion, passivity and immunity. (a) 2 Cd 2e Cd ca 2H0 Cd(OH), 2H Ca(OH), HCdo H HCDO 2 3H

a. Convert the following Newman projection of compound G to a three dimensional line structure in the given conformation. Place the aldehyde functional group on the right handside of according to the template. (3) CH,OH CI. NH2 OH Pr H. Bu G b. Draw a Newman projection of the given compound H viewed from C2 to C3 orientated according to the first

Fill in the missing ions or names. Ammonium Acetate Bicarbonate Bisulfate Bisulfite Carbonate Chlorate Chlorite Chromate Cyanide Dichromate Dihydrogen phosphate Hydrogen carbonate Hydrogen phosphate Hydrogen sulfate Hydronium H3O Hydroxide Hypochlorite Hypoiodite Iodate Iodite Nitrate Nitrite Perchlorate Periodate Permanganate Phosphate Sulfate

Name Formula NH4 IO2 PO43 HCO3 Cr20,2 MnO4 CIO3 CIO4 HSO3 I04 NO2 IO3 CrO, HSO4 ClO2 HCO3 SO32 Cio CO,2 HSO4 CN H2PO4 NO3 SO,2 OH C2H3O2 HPO42 IO Hydronium H3O

Copper (Cu) is a transition metal. True False QUESTION 2 An atom of the isotope sulfur31 consists of how many protons, neutrons, and electrons (p proton, n neutron, e electron) O 15 p, 16 n, 15 e 16 , 15 , 16 O 16 p, 31 n, 16 e O 32 p, 31 n, 32 e 16 , 16 , 15

An anion is defined as an atom or group of atoms with a net negative charge. a stable atom. a group of stable atoms. an atom or group of atoms with a net positive charge. neutral. QUESTION 4 Almost all the mass of an atom is concentrated in the nucleus. True False

All neutral atoms of tin have 50 protons and 50 electrons. True False QUESTION 6 A row of the periodic table is called a(n) group. period. isotopic mixture. family. subshell.

How many neutrons are there in an atom of lead whose mass number is 208 82 126 208 290 none of them QUESTION 8 The elements in Group 1A are called the QUESTION 9 The elements in Group 2A are called the

The elements in Group 8A are called the QUESTION 11 Two isotopes of an element differ only in their symbol. atomic number. atomic mass. number of protons. number of electrons.

195 What element is represented by X in the atomic symbol notation 78 X Iridium Platinum Palladium Selenium Magnesium QUESTION 13 Which of the following is a nonmetal Lithium, Li, Z 3 Bromine, Br, Z 35 Mercury, Hg, Z 80 Bismuth, Bi, Z 83 Sodium, Na, Z 11

Which of these elements is chemically similar to magnesium Sulfur Calcium Iron Nickel Potassium ,QUESTION 15 Silicon, which makes up about 25 of Earths crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28si, 29si, and 30si. Calculate the atomic mass of silicon. Abudance Isotope 285i 29si

Rutherfords experiment with alpha particle scattering by gold foil established that O positive charge not evenly distributed throughout an atom. electrons have a negative charge. electrons have a positive charge. atoms are made of protons, neutrons, and electrons. protons are 1840 times heavier than electrons. QUESTION 17 What is the ion that zinc

How many electrons are in the S2 ion QUESTION 20 How many electrons are in the iron (III) ion

Post any questions or concerns that you are willing to share with the group. The Discussion Board represents an opportunity to network with your course colleagues, and others may have the same questions or concerns. Support the main post with 3 more current, credible sources and cite a source within the content of posting and on a reference list

Question 18 What is the ion that selenium forms (write your answer with no spaces, like this Na1) ,Question 8 The elements in Group 1A are called the ,Question 18 What is the ion that selenium forms (write your answer with no spaces, like this Na1) ,QUESTION 11 Two isotopes of an element differ only in their symbol. atomic number. atomic mass.

2. (16 Points) Give the correct IUPAC names for the following compounds. a. b. C. d. HC CI 2 CI CH3 3

What is the sum of the coefficients of the balanced equation for the following reaction: P4(s) + F2(g) ---> PF3(s) ** Note: be sure to include coefficients of one.

The addition of 0.351 L of 1.25 M KCl to a solution containing Ag+ and Pb2+ ions is just enough to precipitate all of the ions as AgCl and PbCl2. The total mass of the resulting precipitate is 61.60 g. Find the mass of PbCl2 and AgCl in the precipitate. mass of PbCl2 ________g mass of AgCl: ____________g

In undergraduate chemistry teaching labs, an Fe2 solution, normally of unknown concentration, is titrated with a KMNO4 solution of exact concentration (assume 0.062 M). The endpoint is detected when the purple color of permanganate persists. Give the (balanced) reactions that are occurring and explain the titration experiment at various stages,

Balance the following chemical equation (if necessary) (NH.)PO(aq) MgCl(aq) Mg(PO.)(s) NH.CI(aq)

3.) A fuel oil (SG = 0.84) has the following mass percent analysis: C = 84.4 O = 2.7 S = 0.2 H = 12.3 N = 0.4 Calculate for complete combustion and dry air 20 per cent in excess: a. Mass of air per kg of coal and per liter of oil. b. Gravimetric analysis of flue gas.

and Sketch the E vs. k dispersion relation for a twodimensional, square lattice of pr and pay attention to o and r interactions. Assume that x and y lie in the plane of the lattice. The points defining the Brillouin zone boundaries are r(0, 0), X(Ta, 0), Y (0, Ta), and M(Ta, Ta). Sketch the densities of state alongside. For full credit, the

A) Consider a container of volume 5.0L that is divided into two compartments of equal size by a partition. On one side is N2 at 1.0 atm and 298 K and on the other side is H2at 1.0 atm and 298 K. Calculate the AmixGwhen the partition is removed. B) Data is collected for the total volume of a solution of compound A compound B at different mol

(a) Briefly describe THREE (3) possible chemical reactions to produce primary oleochemicals. (3 Marks) Do you think petroleumbased chemicals totally can be replaced by oleochemicals in the future Explain your answer in term of processing and costing. (b) (4 Marks) (c) Contrast soap with detergent in term of the sensitivity to acidic solution and

A student measures the molar solubility of zinc hydroxide in a water solution to be 2.18x10 0 M. Based on her data, the solubility product constant for this compound is

Provide a synthesis for ethyl acetate starting with ethanol (shown below).

HC DH

Consider a quantum system with two energy levels denoted by 1) and 2). Its Hamiltonian has matrix elements (1H1) a2 (2H2) a2 (1H2) (2H1) b. (1) (2) (3),4. Write H in matrix form. Now, define the transformation matrix U cos(z) sin(z) sin(z) cos(z) (4) and its transpose UT, and transform H into a rotatedbasis by finding the matrix elements of H

Complete the following:

C. HO H,SO., 100C

Determine the expected result of each amine test for the following compounds. Draw the resulting compound if there is a reaction. a.Treatment with TsCl/NaOH b. Acidification of mixture in (a) c. Neutralization equivalent from titration w/ HCl. d.Treatment with NaNO2/HCl at <5oC. e.Treatment of the solution in (4) with 1-naphthol. f.Treatment with

NCHCH), NH,

As a food chemist for a major potato chip company, you are responsible for determining the salt content of new potato chip products for the packaging label. The potato chips are seasoned with table salt, NaCl. You weigh out a handful of the chips, bol them in water to extract the salt, and then filter the boiled chips to remove the soggy chip

Assuming that l2 forms a perfect crystal at OK, compute the absolute entropy of solid l2 at 298K in J(K mol) using the following heat capacity data at various temperatures (T). Cp.m (10 K) 14.7 T J(K mol) 3D Cp.m (solid, 10 K) 12.50.23T 0.0005 T2 J(K mol)

Based on the IR spectra, NMR spectras as well as MS value. What is the identity of the unknown compound? What is its structure? Show its fragments

8 14 7 1 1 CO 6 1 LO 5 2 4 PPM 3 2 1 0,140 EIMS 134.1 120 100 80 PPM 60 40 20,Analyst Date T 102 95 90 85 80 75 70 65 60 55 50 45 40 35 30 28 4000 Sample Name Teaching 3711 3312.1 3500 Teaching Friday, September 18, 2020 1037 AM 3059.13024.9 2858.8 3080.2 2922 3000 2500 cm1 2000 Description Sample 3711 By Teaching Date Friday, September 18 2020

A 1.060 g of NaCO, required 20.00 mL of a hydrochloric acid solution for complete neutralization NaCO(aq) 2 HCI(aq) 2 NaCl(aq) CO(g) H0(1) What is the molarity of the HCl solution

1b. Consider a mixture of two components A and B where A is more volatile than B. Make temperature composition phase diagrams for each of the following cases. Use temperature as the yaxis and mole fraction of A as the xaxis. Label the phases on each plot, i.e. liquid, vapor, and liquid vapor. For those cases where an azeotrope is formed, indicate

2. Why might atoms, which exhibit longer wavelength absorption lines, be more sensitively detected by atomic emission spectroscopy relative to atomic absorption spectroscopy

Calculate the vapor pressure of iodine (rhombic) at room temperature (298 K). Standard molar enthalpies of vaporization and boiling temperatures for selected substances are shown in Table 10.2 in the textbook. R 8.314 JK mol1. Express your answer using three significant figures.

Assuming that the heat capacity of ice, water, and steam are constant at 37 J K mol, 75 J K mol, and 36 JK mol, respectively, over the temperature ranges in this problem and the heat of fusion and vaporization for water are 6.01 kJ mol and 40.7 kJ mol, respectively, calculate the heat required to raise the temperature of 2.8 g of ice from 10.C to

The rate constant, k1 for a second-order reaction between substances A and B is 0.135 L/mol-s at 69.4C and 3.70 L/mol-s at 81.2C. Determine the rate constant for the reaction at 55.0C.

Back wavelengths bend differently inside the prism so that the into its component wavelengths. Physics 2B or 52 will take Prelab (5 points) Experiment 7.pdf Q To be done before coming to lab on the day of Exp. 7 n6 n5 n4 A) Using Equation 1 calculate the energy for the first five electron energy levels of the hydrogen atom. We have already done n1