Chemistry Questions and Answers July 02, 2020

15mL of 0.02M Na2SO3 solution react complete with 10 mL of copper solution. Calculate the amount of Cu2+ ion 10 mL solution and per liter of solution.

How to eliminate cations interfering with the analysis? Which chemicals are used to neutralize the solution after the removal of interfering cations?

Calculate the percentage of wine coolers served at the ideal temperature, between 49 and 55 degrees? Do NOT include the % symbol with your response. Answer format: ##. Hint : Find Z for 49 and for 55 by using the STANDARDIZE formula with the mean and standard deviation values. Find P(z) by using the NORM formula and the Z value. Find the

RESULTS OF CONCEPT RATING FOR NEW WINE COOLER Rating of the appeal of the phrase as it relates to the Total new wine cooler Sample Gender Male Female Extremely appealing (5) 151 68 83 Somewhat appealing (4) 91 51 40 Neither appealing nor not appealing (3) 36 21 15 Somewhat unappealing (2) 13 7 6 Not at all appealing (1) 9 3 6 QUANTITY PURCHASED

The action of rennet on casein is linked to casein insolubility because of these, except OOOO Disintegration of casein micelle Removal of sugars from casein Caseinwhey proteins interaction Aggregation of casein Question 41 0.42 pt Which of the following observations regarding milk is incorrect Boiled milk is sweeter ue to partial breakdown of

The following practical situation illustrates that different ways of aver aging the same quantity can lead to significantly different results. Suppose that one desires to invest money by buying at the beginning of every month a certain number of shares of stock in a company. The cost c, per share depends, of course, on the particular month r and

In the industrial synthesis of hydrogen, mixtures of CO and H2 are enriched in H2 by allowing the CO to react with steam. The chemical equation for this so called watergas shift reaction is CO(g) H2O(g) CO2(g) H2(g) What is the value of Kp at 700K if the partial pressures in an equlibrium mixture at 700K are 1.31 atm of CO, 10.0 atm of H2O, 6.12

iPad How to Determine the Reaction Stoichiometry EXPERIMENTAL WORK Reagent and apparatus Reagent GH,O.(aq) NaOH(aq) Apparatus 20 mLglass sample bottle Sample bottle stand 2 mLpipette Concentration (M) 0.5 0.5 10 mLmeasuring cylinder Pen type digital thermometer 224 PM classroom.google.com No. of pcs. 18 2 2 2 1 9 Hazards and cautions C.H.O.(aq)

3) Measure the maximum temperature of the mixed solution. (T) 4) Repeat 13) for all the pairs, RESULTS (1) Graph of the experimental data. 5. (a) 10 9 6. 4 3. 2 1 0 Volume(C H,O,(aq))ml 0 1 2 3 4 5 6 7 8. 9. 10 Volume(NAOH(aq))mL (b) O O O. O 8 7 6 5 Volume(C,H,O,(aq))mL 10 9 3. 2 1 0 0 1 2 3 4 5 6 7 Volume(NaOH(aq)) mL 9 10 Q7. Propose a method

The particle on a ring is a useful model for the motion of electrons around the porphyrin ring, such as the ring shown in Figure 1. The conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. The group may be modelled as a circular ring of radius 440 pm, with 22 electrons in the conjugated system moving along

A. How did the experiment in Part I demonstrate surface tension Use your experiment observations when answering this question. B. In Part I, when adding the needle to the water, which approach worked best to balance the needle on the water the vertical or horizontal placement Explain your answer. C. In Part II, how did your paper clip estimation

Is the concentration of NaOH sufficient to satisfy the condition that the chemical reaction between CO2 and NaOH is irreversible. Provide a quantitative answer. For the packing used: HG = 0.3 m and HL = 0.15 m.

Why 3d orbital is possible but 3f is not possible? Explain it.

How did Neils Bohr solve the defect of Rutherfords model related to such movement of electron? Analyse the matter.

Define half-life. Prove that the half-life of 1st order reaction is independent of the initial concentration of the reactant.

Define molarity. What is the molarity of a solution prepared by dissolving 75.5 g of pure NaOH (Molecular weight = 40) in 540mL of solution?

Define Chemical equilibrium. Determine the equilibrium constant (kc) for the synthesis of PCls from PCI3 and Cl2 (PCI3 Cl2 PCI5).

3) Measure the maximum temperature of the mixed solution. (T) 4) Repeat 1)3) for all the pairs. RESULTS (1) Graph of the experimental data. (a) 4 3 ATC N 0 10 ATC N 12 O 10 9 TTT 0 1 2 3 4 5 6 7 8 Volume(NaOH(aq))mL (b) 10 9 0 8 7 6 5 4 3 Volume(C,H,O,(aq))mL 0 1 2 3 4 5 6 7 8 9 10 Volume(NaOH(aq))mL Q7. Propose a method to determine the mixed

Summer Agricultural Supplies Ltd uses the net credit sales method for estimating doubtful debts. It is estimated that 2% of net credit sales will be uncollectable every month. On 1 June 2022, the Allowance for Doubtful Debt account has a credit balance of $2,100. Some additional information is also provided below. 5 June 2022 - After concerted

iPad 225 PM O 17 D A classroom.google.com 3) Measure the maximum temperature of the mixed solution. (T) 4) Repeat 1)3) for all the pairs, RESULTS (1) Graph of the experimental data. (a) 4 O 3 2 1 0 10 9 8 Volume(C H,O,(aq))ml. 6 3 0 1 2 3 4 5 6 7 8 Volume(NAOH(aq))mL 10 (b) 4 O 3 a2 1 0 8 7 6 9 Volume(C HO,(aq)) mL 10 1 2 3 4 5 6 8 10

(2) Analyze the graph and determine the reaction stoichiometry. CH,O(aq) NaOH(aq) (3) Using the experimentally determined reaction stoichiometry, write the chemical equation for the reaction between C.H.O.(aq) and NaOH(aq). CALCULATION OF REACTION ENTHALPY Q8. Can we determine the reaction enthalpy, A.H, for the reaction between C,H,O.(aq) and

What is the molarity of a solution prepared by dissolving 75.5 g of pure NaOH (Molecular weight = 40) in 540mL of solution? Write step by step solution clearly.

Provide a description for each of the entries below based on the journal entry. Example Dr. Inventory Cr. Accounts Payable 18,000 18,000 Purchased inventory, on account, for 18,000. 1 Dr. Equipment Cr. Cash 950,000 200,000 Cr. Note payable 750,000 2 Dr. Trademark 150,000 Cr. Common shares 150,000 3 Dr. Bank Loan Cr. Cash 15,000 15,000 4 Dr. Land

50 gallons of 0.2 M sodium phosphate are poured into a pond with dimensions 10 meters x 4 yards x 16 feet. What is the concentration in mg/L of phosphorus of phosphates if the pond is half full? Previously, the pond water was tested and found 0.5 mg P-phosphate per gallon. Explain.

2. What is the pressure in pascals if a force of 3.44 104 MN is pressed against an area of 1.09 km2 ? 3. What is the final temperature of a gas whose initial conditions are 667 mL, 822 torr, and 67C, and whose final volume and pressure are 1.334 L and 2.98 atm, respectively? Assume the amount remains constant. 4. What is the final pressure of a

Method in Fat Brief Applicability Advantages Disadvantages analysis description 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Alkylation reactions Calkylation using SAM Calkylation is a process fort carboncarbon bonds. OH SAM Products Mechanism

Determine structures A and B (B does not contain any tin atom). In each case, justify with an appropriate mechanism (NIS N iodosuccinimide). II BuzSn. C6H11 OEt A NIS AIBN, C6H6, reflux TBSO JOC 1997 52

At high temperatures, elemental nitrogen and oxygen react with each other to form nitrogen monoxide N2 (g) O2 (9) 2NO(g) Suppose the system is analyzed at a particular temperature, and the equilibrium concentrations are found to be N2 0.037 M, 0.067 M, and 02 NO 4.4 x 104 M. Calculate the value of K for the reaction. K Submit Answer Retry

The equilibrium constant, Kc, for the following reaction is 6.30 at 723K. ed 2NH3(g) N2(g) 3H2(g) If an equilibrium mixture of the three gases in a 16.2 L container at 723K contains 0.420 mol of NH3(g) and 0.480 mol of N2, the equilibrium concentration of H2 is . Submit Answer Retry Entire Group 9 more group attempts remaining

The equilibrium constant, Kc , for the following reaction is 5.10x106 at 548 K. NHC((s) NH3(g) HCI(g) If an equilibrium mixture of the three compounds in a 5.11 L container at 548 K contains 3.18 mol of NH4CI(s) and 0.289 mol of NH3, the number of moles of HCI present is moles. ered mit Answer Retry Entire Group 9 more group attempts remaining

The decomposition of N,O, can be described by the equation 2 N,0,(soln) 4 NO, (soln) 0,(g) Consider the data in the table for the reaction at 45 C in carbon tetrachloride solution. t(s) IN,O,1 (M) 2.302 165 2.075 546 1.633 775 1.414 Given the data, calculate the average rate of reaction for each successive time interval. What is the average rate

4. Why might the answers to the best tablet by the titration method and the best tablet by the FeClh method NOT agree Answer this even if your answers do agree.

2.95 V Question 27 How many Faradays are required to reduce 5g of aluminum (III) to aluminum metal (1 point ) AG nF Eccl 0.31 F 0.56 F 1.48 F 3.84 F ,2.95 V Question 27 How many Faradays are required to reduce 5g of aluminum (III) to aluminum metal (1 point ) AG nF Eccl 0.31 F 0.56 F 1.48 F 3.84 F ,2.95 V Question 27 How many Faradays are required

The proton NMR spectrum for a compound with formula C8H18 shows only one peak at 0.86 ppm. The carbon13 NMR spectrum has two peaks, a large one at 26 ppm and a small one at 35 ppm. Name the compound.

The reaction 2NO (g) 02 (g) 2NO2 (g) has the thirdorder rate law rate kNO2 O2, where k 25 M s1. Under the condition that NO 2 O2, 8kt 1 the integrated rate law is What are the concentrations of NO, O2, and NO2 after 120.0 s if the initial concentrations are NO 2.20102 M and O2 1.10x102 M Express your answer using two significant figures.

Given the uncertainty associated with player demand, how should Reebok approach the inventory plan for NFL replica jerseys?

Refer to the following wage breakdown for a garment factory. Hourly Wages Number of Wage Earners $4 up to $7 18 7 up to 10 36 10 up to 13 20 13 up to 16 6 What is the class interval for the table of wages above? $2 $3 $4 $5

2. A flexible container is charged with 51.00 L of gas at 368 K. Under conditions of constant pressure and moles of gas, what is the volume of the gas when the temperature is tripled a. 153 L b. 0.850 L c. 17.0 L d. 51 L e. 0.0588 L

1. Calculate the density of O2, in gL, at STP. 1.62 gL b. 0,714 gL 1.43 gL. d. 1.14 gL e. 0.810 gL a. .

3. One of the spectral lines in the emission spectrum of mercury has a wavelength of 6.234 x 107 m. How much energy is emitted if 1.00 mole of mercury atoms emits light of 6.234 x 107 m Express your answer in kJmol. a. 3.19 x 1022 kJmol b. 5.56 x 101 kJmol 485 kJmol d. 215 kJmol 192 kJmol C. e.

Classify polymer on the basis of mode of synthesis.

Distinguish between addition polymer and condensation polymer.

Write a short note on Glass Transition Temperature.?

3. One of the spectral lines in the emission spectrum of mercury has a wavelength of 6.234 x 107 m. How much energy is emitted if 1.00 mole of mercury atoms emits light of 6.234 x 107 m Express your answer in kJmol. a. 3.19 x 1022 kJmol b. 5.56 x 101 kJmol 485 kJmol d. 215 kJmol 192 kJmol C. e.

Solid potassium hydroxide is slowly added to 75.0 mL of a iron(III) sulfate solution until the concentration of hydroxide ion is 0.0137 M. The maximum amount of iron(III) ion remaining in solution is M.

When 17.0 grams of zinc, Zn, and 0.530 moles of sulfur, S , react, how many moles of zinc sulfide, Zns, is formed Zn (s) S (s) Zns (s) AE moles zinc sulfide, ZnS. (Answer to 3 significant figures)

Three point charges, +6.6 C, +1.5 C, and -2.1 C, lie along the x-axis at 0 cm, 2.4 cm, and 5.3 cm, respectively. What is the force exerted on qi by the other two charges? The Coulomb constant is 8.99 x 109 Nm/C. What is the force exerted on 92 by the other two charges? (To the right is positive.)Answer in units of N. 019 (part 3 of 3) 10.0 points

On page 529 of the text (right before section 18.3) the energy available from the proton gradient was derived. This assumes that the pH is 1.4 units lower in the IM space than in the matrix and that the potential inside the matrix is OV and in the IM space is 0.14V. How much energy would be available if instead the pH in the IM space was 3.5 units

Reorder each list in the table below, if necessary, so that the atoms or ions in it are listed in order of decreasing size. atoms or lons in order of decreasing size OP atoms or lons 0.0.0 Kr, He, r 0.0.0 Na, Ma, Mg 0.0.0

A sample of carbon dioxide gas at a pressure of 889 mm Hg and a temperature of 36 C, occupies a volume of 11.9 liters. If the gas is cooled at constant pressure to a temperature of 4 C, the volume of the gas sample will be L. Submit Answer Retry Entire Group 9 more group attempts remaining

ZnSiP has a body centered Bravais lattice and a chalcopyrite structure. See the attach information. Question 1 For the ZnSiP2 material What is the direction between the 14, 14, 18 P and the 12, 12, 12 Zn O 112 122 O 112 O 223 Question 2 What plane is perpendicular to that direction (121) O (111) O (223) O (223) Question 3 What is the interplanar

A novel inorganic compound has two different crystalline forms, namely blue and red crystals. The physical and thermodynamic properties of blue and red crystals are given below. Mw of the novel inorganic compound is 86.54 g mol1. Properties (T 298 K, P 1.00 bar) Blue Red AH (kJ mol 1) I 1722.6 1722.9 AG (KJ mol 1) 1648.5 1647.1 Sin (U K1 mol 1)

write the mechanism of following reactions

Bi(0H4H0 ROH RH DMF MeoH 0. ROAU R0THP DCM

How many moles of K are there in a sample of K that contains 1.14x1024 atoms moles Submit Answer Retry Entire Group 9 more group attempts remaining

please write the mechanism of following reactions ElaN RCOH RCO Bn Bn0 Ph CT3 Me Lo Bn R RCO.H PMA. 02 Pole Eta SiH Meorl OBn R. Ph Ph OBn MeorM

Explain the reaction by observing the sets of molecular collisions below. 1. 2. 3.

Analyze the picture below to discuss activation energy. 1. Take note Hill represents activation energy Ball represents particles.

A volume of 500.0 ml. of 0.120 M NaOH is added to 615 mL of 0.200 M weak acid (K, 1.11x 10, What is the pH of the resulting buffer HA(aq) OH (aq) H,O) A(aq) pH

The pk, of hypochloron acid in 7.530. A S40 ml. olution of 012 Msodim ypochorie (NOCied wi 0 M HCL Calculate the pH of the solution afier the addition of S.10mlof000 M HCI Calculate the pt of the solution afher the adkdition of 246 iml. of 0.300 M HCL Caleulae the pi of the solton a te ivalence poit with 00 M HCI. 10.22

1. Discuss Diabetes Mellitus in line with carbohydrate metabolism in no more than 300 words. Discuss Hemolytic Anemia in line with pentose phosphate pathway in no more than 300 words. 2.

A 25.0 mL sample of 0.150 M HNH2 (aq) is titrated with a 0.150 M NAOH solution. What is the pH after 26.0 mL of base is added The Ka of HNH2 is 1.9 x 105 A) 7.00 B) 4.70 C) 4.74 D) 2.54 E) 11.47

The structural formulas and relevant pKa values for the four components of an Excedrin tablet are shown. (The protonated form of the boxed group is shown.) A. Predict the migration order in capillary zone electrophoresis with a 20 mM borate run buffer at pH 9.3. (Hint First figure out charges on the species.) CA PH pka log CHAJ X 3.5 OH HO DK

Two general chemistry students working together in the lab weigh out 0.832 g of CaCl2 2 H2O into a crucible. After heating the sample for a short time and allowing the crucible to cool, the students determine that the sample has a mass of 0.739 g. They then do a quick calculation. On the basis of this calculation, what should they do next? (a)

Review the scenario and then answer the questions. THE CHALLENGE Ramn has graduated from college and started his career as an engineer. Now he thinks he may be ready to buy a condo or townhouse Ramons gross pay is 1,100 a month, and his net, or takehome pay, is 3,075. He has been saving for a down payment and closing costs and has 4,200 saved so

The effect of the various greenhouse gases on the radiative forcing may be crudely estimated by setting Teff due to the ith species. Suppose that the concentration of a single species (say, CO2) were increased from t to t ATi. (a) Show that the radiative forcing is given by AN (b) Show that a CO2 doubling (for which N change in opacity is AtE ti

Complete the reactions.

heat h) CH,CH,OH i) 1) excess CH,CH,MgBr 2) H,O H,0 heat k) 1) NaOH 2) heat 1) NaOEt OE EtO 2) heat

Calculate and for the n 2 state of a particle in a onedimensional box of length a. Show that (McQuarrie 326) Postulates of Quantum Mechanics Particle in a Box

4. Determine whether or not the following pairs of operators commute. (McQuarrie 36) (a) 2 dx dx dx2 (b) d dx SQRT SQR (c) (d) ax ay Showu thot

The grand partition functions of the phases I and II are given by Er (A,B,..., T, V1) and En AB,,TVI) respectively. The two phases are in mutual equilibrium with particles A, B, ... interchangeable between the phases. Show that the number of particles, NA, NA, NB, NB.... in phase I or II are determined by N NA alog E, an log E a Ons NANANA (total

When the following equation is balanced, what is the coefficient in front of the Al(NO3)3(aq) Al(NO3)3(aq) PbCl2(s) AICI(aq) Pb(NO3)2(aq) O a. 1 O b. 6 O. 4 O d. 2 O e. 3

Determine, with brief explanation, which of the following is expected to have a higher acidity. FH2C OH V.S. H3C i. HO. F3C OH V.S. BrgC HO. O,N. OH V.S. O2N HO, V.S. iv OH V.S.

Suggest all the possible interactions that metoclopramide can interact with in physiological pH. CI N. H. H2N O.

What is the entropy change when 0.17 moles of CHCI, vaporizes at 61.0 C AH(vap) 29.6 kJmol at 61.0 C

The values of at 330nm for ArOH and Aro forms of 2naphthol are 1587.5M1cm1 and 2050 M1 cm1. If the concentration of the solution of 2naphthol is 8105M. calculate the value of pka of 2naphthol. The adsorption of the buffer solution (pH 10.0) of 2naphthol at 330nm is 0.138

Selectthe reagents for the following transformation. Please enter your answer as a string of capital letters with no space in between, for example ACA A. HPt B. I) NANH, 2) H,o C. tBuOK D. xs HBr E. BryH,0 F. NaOEt G. BrycCl, H. EIB. I. HBr J. OYDMS K. KMNO,, NAOH cold L. NaNH M. HBr, ROOR N. 1) RCO,H, 2) H,o O. 1) BH3. THF 2) H,O,, NAOH P. 1)

Select the reagents for the following transformation. EH Br Please enter your answer as a string of capital letters with no space in between, for example ACAD A. HPt B. NANH IBUOK D. xs HBr E. BryH,O F. NaOEt G. BryCCL, H. EIB. I. HBr J.O,DMS K. KMNO,, NaOH cold L. NaNH, M. HBr, ROOR N. I) RCO,H, 2) H,O O. 1) BH,. THF 2) H,O,, NAOH P. 1) Hg(OAc),,

Provide structures for the compounds obtained after each reaction. Assume a workup with mild acid or base is done if needed after the final step of each sequence. Br LDA, THF, 78 C THF, 78 C Br LDA, THF, 78 C THF, 78 C Br LDA, THF, 78 C then warm to 0 C THF, 0 C

3. Do you expect Ni(s) to dissolve in basic solutions in the absence of oxygen Hint Write the overall reaction and calculate AG.

Q5. Density of cylindrical rod Method A Density (gc.c.) std. dev. 2.356 0.001 2.362 0.004 2.348 0.007 What is the density and the uncertainty for this object Additional information The caliper resolution is 0.01 mm and that of the weighing balance is 0.01 g

An aqueous solution of perchloric acid is standardized by titration with a 0.198 M solution of calcium hydroxide. If 19.0 mL of base are required to neutralize 18.5 mL of the acid, what is the molarity of the perchloric acid solution M perchloric acid

Calculate the Frenkel defects lattice sl es Ny for an ionic compound at its melting temperature 625 C. Where the activation energy for defect formation is 3.1 ev, the force of attraction between A2 cation and B2 anion is 1.67 x 10 N assuming an isolated ion pair. the cation radius is 0.080 nm, the electron charge is 1.60 x 1019 C. Boltzaman

Quantitative Chemical Analysis Harris Lucy presented by Macmillan Learning Indirect EDTA determination of cesium. Cesium ion does not form a strong EDTA complex, but it can be analyzed by adding a known volume of NaBil, in cold concentrated acetic acid containing excess Nal. Solid Cs, Bi,I, is precipitated, filtered, and removed. The excess

In this question enter subscripts and superscripts as normal text (e. g.. 4B2u would be entered as 482u). What is the symmetry of the HOMO in methylene What is the molecular term symbol for the ground state electronic configuration of methylene The first two excited states for methylene arise from promotion of an electron from its HOMO to its

5. Write the products of the following reactions. If there is no reaction write NR. Br, and light C14 solvent KMn04, excess, hat Hz gas, 1 atm, RT, Ni

Propose an efficient synthesis for each of the following transformations. Show all intermediate products, reagents and conditions.

NO2 NH2 OH .CN

When the following equation is balanced properly under acidic conditions, what are the coefficients of the species shown cro,2. Cr3 NO2 NO, Water appears in the balanced equation as a (reactant, product, neither) with a coefficient of (Enter 0 for neither.) How many electrons are transferred in this reaction When the following equation is balanced

Define chemical equilibrium. Write down the characteristics of chemical equilibrium.

Establish the relation between Kp and Kc where symbols have their usual meaning.

Write the k kp equation of the followings I. 2NO2N2O4 . H2 I2 2HI III. N2 3H2 2NH3