Chemistry Questions and Answers July 10, 2020

Consider the following reaction H2(g) Br2(g) 2HBr(g) At some temperature, Kp 2.44. Within a container, PH 6.80 atm, Par 3.30 atm, and PHBr 7.40 atm Determine Qp for this reaction under these conditions. (Round Qp to 3 sig figs). Qp In which direction will the reaction shift to reach equilibrium (Round Qp to 3 sig figs). Submit Answer Tries

Jom is testing out a chemical process for the extraction of iron metal from ferric oxide. They performed the following 2step reaction (excess Zn(s) is removed by adding acid) (MW Fe55.845 gmol O15.999 gmol) I. II. Nitric acid was added to ferric oxide to yield ferric nitrate Excess zinc dust was added to the ferric nitrate to yield metallic

In the temperature range between 0C and 700C the resistance R lin ohms (12) of a certain platinum resistance thermometer is given by R 10 0.04124T1.779 x 1057 where I is the temperature in degrees Celsius. Where in the interval from 0C to 700C is the resistance of the thermometer most sensitive and least sensitive to temperature changes Hint

The town of Clearford, Alabama, is seeking proposals for a new wastewater treatment plant (WWTP) to meet increasingly stringent water quality limits that are anticipated when the next Alabama Department Environmental Management permits is received in three years. The wastewater flow from Clearford, population 180,000, is primarily domestic and

8. The major product obtained when BrFe is treated with A) HC HN Br CH3 HC HN CH3 is,B) C) D) H C HC Br H C HN HN HN Br CH3 CH CH3 Br

A Carnot engine operating between temperatures T1 and T2 has efficiency 1/6. When T2 is lowered by 62 K, its efficiency increases to . Then T1 and T2 are, respectively (a) 372 K and 310 K (b) 372 K and 330 K (c) 330 K and 268 K (d) 310 K and 248 K

100 g of water is heated from 30 C to 50 C. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J kg 1 K1) (a) 4.2 kJ (b) 8.4 kJ (c) 84 kJ (d) 2.1 kJ

EDTA4-i9s ethylenediamine tetraacetate ion The total number of N-CO-O bond angles in [Co(EDTA)]-1 complex ion is. (a) 4 (b) 8 (c) 6 (d) 9

.In a positive nitrogen test with a Lassaigne solution of an organic molecule, the chemical generated is (a) Fe4[Fe(CN)6] Fe4[Fe(CN)6] Fe4[Fe(CN)3 (b) [Fe(CN)5NOS] Na4[Fe(CN)5NOS] (c) Fe(CN)3 Fe(CN)3 Fe(CN)3 Fe(CN) (d) Na3[Fe(CN)6] Na3[Fe(CN)6] Na3[Fe(CN)6

The number of geometric isomers possible for the complex [CoL2Cl2](L=H2NCH2CH2O ) is: (a) 5 (b) 3 (c) 9 (d) 6

Please draw the products of the following reactions

ol (a) NaBH4 CHJOH ,() (c) (d) OH OH

Which of the following quantum numbers governs the spatial orientation of an atomic orbital? (a) Spin quantum number (b) Magnetic quantum number (c) Azimuthal quantum number (d) Principal quantum number

The highest energy molecular orbital for the allyl system is (a) 1/2 1+1/2 2+1/2 3 (b) 1/2 1-1/2 3 (c) 1/2 1-1/2 2+1/2 3 (d)1/2 1-1/2 2-1/2 3

What is the point group of XeF4 (a)C2V (b) D3h (c) C3V (d) D4h

What is Kc for the following reaction in state of equilibrium? (a) 13.658 L mol-1 (b) 15.235 L mol-1 (c) 12.229 L mol-1 (d) 17.685 L mol-1

2SO(g) 0(8) 2SO3(8) Given SO 0.6 M O 0.82 M and SO3 1.90 M

With which one of the following elements silicon should be doped so as to give ptype of semiconductor? (a) Germanium (b) Arsenic (c) Selenium (d) Boron

The density of copper metal is 8.95 g cm3 If the radius of copper atom is 127.8 pm, is the copper unit cell simple cubic, body centred cubic or face-centred cubic? (At mass of Cu=63.54g mol1 and NA = 6.021023 mol1) (a) 8.94 g cm-3 (b) 5.86 g cm-3 (c) 7.94 g cm-3 (d) 9.57 g cm-3

1. What is meant by catalyst specificity? Explain the example correctly.

Give the some reactions of conversion of potassium manganate to potassium permanganate.

The enthalpy of N 2(g) + 3H 2(g) 2NH 3(g) is 300K and the pressure - 22kcal. Find the enthalpy of the reaction at 400K and the same pressure. Cp (N 2 ) = Cp (H 2 ) = 3.5R Cp (NH 3 ) = 4R, R = 0.002 kcal/K/ mol

How do you get ethyl orthofarmet ?

How do you get phenol? (i) Picric acid (ii) Salicylic Acid

Convert the following molecular reaction into an ionic reaction. 2BaCrO 4 + 6 KI + 16 HCl 2BaCl 2 + 3I 2 + 6KCl + 2CrCl 3 + 8 H 2 O

Calculate the equilibrium constant of the reaction Cu + Cu 2+ (aq) 2Cu + (aq) at 25C . Cu 2+ (aq) + 2 Cu (s) E = - 0.34 V Cu 2+ (aq) + 2 Cu + (s) E = + 0.15 V

If the temperature of a reaction is increased from 298 K to 308 K, its rate of rate doubles. Find the activation energy of that reaction.

. How is polyacronitrile obtained?

. Hydrogen reduction of 1.375 grams of copper oxide gives 1.098 grams of copper and by reduction of 1.476 grams of copper oxide, 1.179 grams of copper is obtained. Prove that these figures explain the law of constant proportion.

Find the number of atoms in 52 u of helium.

How many grams of CO 2 are present in 0.2 mol CO 2 ?

Calculate the number of atoms in 1.0 g of He and the volume at NTP

A structure made of identical spheres has a core length of 0.4 picometer . Find the radius of the molecules. if this (i) It is a single linear lattice. (ii) bcc is lattice. (iii)fcc is a lattice.

4.6 g of ethanol is dissolved in 250 ml of solution. Calculate its active mass.

Calculate the pH value of H2SO4 solution of m/1000 concentration.

The value of hydrogen ion concentration of a solution is 0.005 g-equivalent per liter, what will be its pH?

The concentration of Ag + ion in a saturated solution of Ag 2 CrO 4 at 20C is 1.5 10 -4 moles per liter. Find the solubility quotient of Ag 2 CrO 4 at 20 C.

. The volume of a gas at 76 mm of pressure is 220 ml. If the temperature is kept constant, at what pressure will its volume double?

A gas is heated so much that its pressure and volume double. What will be the new temperature of the gas?

The total pressure inside a container at 95C is 1,320 kPa. It contains a mixture of neon at 250 kPa, Xenon at 925 kPa, and Argon gas. Determine the partial pressure of argon gas. Calculate the mole fraction of Xenon gas

A solution of cupric sulfate is used at blood donor clinics to test donor blood for low iron. Calculate the concentration of this solution, in mol/L, if 125 g of CuSO4 crystals are dissolved in 1.0 L of water.

How much charge is required for the following reduction of 13.5-gram of Al3+ to Al

D5W is an intravenous solution used as a fluid and nutrient replenisher for patients. As a hospitalpharmacist, you need to make 750 mL of this solution with a concentration of 0.30 mol/L. Whatmass of glucose, C6H12O6, will you need to dissolve in water?

T.S.P. is an all-purpose cleaner that can be used to clean driveways. What volume of solution would you get if you dissolved 150.0 g of sodium phosphate with water to produce a 0.23 mol/L solution?

Concentrated hydrogen peroxide in high school labs is 30% W/V H2O2 dissolved in water. Calculate the mass of pure H2O2 dissolved in a 450 mL bottle. The given data is as follows

A concrete etch solution can be used to clean concrete before painting it. The directions tell you to dissolve 680 g of sodium bisulfate in 3.4 L of water. What is the concentration of this solution in g/100 mL?

What volume of a 17.4 mol/L acetic acid stock solution is required to make 2.0 L of a 1.5 mol/L acetic acid solution?

The concentration of an HCI acid solution is initially 6.0 mol/L. What would the concentration of a new solution be if 200 mL of the original HCI solution is diluted to 1.0 L with water?

How much water must be added to 600 mL of a 1.5 mol/L CaCl solution to make the concentration of the resulting solution 1.0 mol/L?

What concentration results from mixing 400 mL of a 2.0 mol/L HNO solution with 600 mL of a 3.0 mol/L HNO solution?

What is oxidation? What is reduction? Explain the modern understanding of each of these termsand identify them within the provided equation.

Assume that laundry detergent is mostly sodium carbonate. Calculate the concentration of thesodium carbonate if a 95.0 g scoop of detergent is dissolved in 25.0 L of water in the washing machine.

Some commercial bleach solutions contain 5.25% W/V sodium hypochlorite. Calculate the sodium hypochlorite concentration in mol/L.

For a chemical analysis, 750 mL of a 0.480 mol/L potassium permanganate solution is to be prepared. Calculate the mass of potassium permanganate crystals that will be dissolved to makethis solution.

Calculate the mass in grams of 0.201 moles of ethyl alcohol, CH6O

Determine the molar enthalpy of a solution of sodium nitrate, if dissolving 8.95 g of the salt in 104.52 g of water in a simple calorimeter causes the water temperature to drop from 22.6 C to18.2 C

Consider the compounds, HBrO and H3ASO3 a. Write the balanced reactions of each with water. b. Which is the stronger acid, HBrO or H3AsO3 ? Explain with an example using 0.10 M solutions of each.

In a chemistry experiment to investigate the properties of a fertilizer, 10.0 g of urea, NH2CONH(s) is dissolved in 150 mL of water in a simple calorimeter. A temperature change from 20.4 C to 16.7 C is measured. Calculate the molar enthalpy of the solution for the fertilizer urea.

A laboratory technician adds 43.1 mL of concentrated 11.6 mol/L hydrochloric acid to water to form 500.0 mL of dilute solution. The temperature of the solution changes from 19.2C to 21.8C. Calculate the molar enthalpy of dilution for hydrochloric acid

1 Alkanes are characterized by the general molecular formula A. CnH2n2 B. CnH2n C. CnH2n2 2Cycloalkanes are characterized by the general molecular formula A. CnH2n2 B. CnH2n C. CnH2n2 3What is the IUPAC name of the following compound CH3 CH3CHCHCCH3 A. 4,4dimethylpentane B. 1tertbutylpropane 4The common name of the following group is CH3CHCH I CH3

1. what is the molarity of a solution containing 678.1 g of disphosphorus pentoxide (P2O5) dissolving 275 mL of soulution. 2. what is the molarity (In M) of a solution containing 752 mf of manganese (II) carbonate monohydrate (MnCo3 H2O) in 3.7 L of solution 3. what is the volume (In mL) of a 0.352 M sucrose (C12H22O11) solution containing 0.0694

After completing this experiment, the student should be able to 1. Demonstrate the concept of quantitative analysis. 2. Make solution and standardize it. 3. Explain the difference between primary and secondary standard solutions. 4. Quantitatively determine the concentration of a base. Introduction Titration is a common method of quantitative

Water is to be pumped from one large open tank to a second large, open tank, as shown in the figure. The pipe diameter is 6 in, and the total length of the pipe between the pipe entrance and exit is 200 ft. Minor loss coefficients for the entrance, exit, and elbow are given, and the friction factor for the pipe can be assumed constant at 0.02. A

B The Assignment Brief Assignment Brief This assignment is to be completed independently. You will need a periodic table and a calculator. LO1 Understand enthalpy changes associated with exothermic and endothermic reactions AC 1.1 Interpret enthalpy profile diagrams for exothermic and endothermic reactions including the concept of activation

Spot the error in each of the transformations below. For each transformation, write a brief description of the error, then rewrite a corrected reaction scheme (with a different starting material OR reagent OR product, as required). a) 03 (cold) en MeS b) c) d) CH3 cat. HSO4 HO Br HCI (excess) Br MU Br CI CI OH OH

Solve for the volume of 2.5 gallons of juice in units of m. 1 gallon 3.785 L 3 2.5 x 10 m 9.5 x 10 m 6.6 x 10 m 3 9.5 x 10 m 3 2.5 x 10 m Click the answer you think is right.

solubility results for benzaldehyde. a. Was benzaldehyde soluble in water b. Can benzaldehyde hydrogen bond to water If so, draw the hydrogen bond interaction. c. Is it possible for a molecule to be able to hydrogen bond to water, but not be water soluble Explain. A. It was slightly soluble . hexane

Silver oxide reacts with hydrazine to form silver and nitrogen in a basic aqueous solution. Write the balanced equation for this reaction. 1) 2Ag2O NH4 4OHN 4Ag 2HO 2) Ag2O NH4 2OH N 2Ag 3HO 3) 2Ag2O NH4N 4Ag 2HO 4) Ag2O 2NH4 6OH 5) 4Ag2O NH4N 8Ag 4HO 2N2 4Ag 8H0

A solid mixture consists of 32.3 g of KNO3 (potassium nitrate) and 5.7 g of K2SO4 (potassium sulfate). The mixture is added to 130. g of water. Use this solubility curve (Figure 1) to answer the questions. If the solution described in the introduction is cooled to 0 ?C what mass of K2SO4 will crystallize?

g solute 100. g HO 50 40 30 20 I 10 0 10 KNO3 KSO4 10. 20 NH,C LiSO4 30 Temperature, C 40 NaCl 50 60

267 Sodium Na and iron (III)oxide FezOs reacts according to the following balance chemical equation clon 6Na(s) Fe2O3(5) If 4.35 mol of Na and 0.63 mol of FezOs are used in the reaction limiting reactant Which of the following i is loob c3effe0b7e

sample weight (gms) 2. What osmotic pressure (77) would be developed across the semipermeable membrane of a sample containing a. 5 sucrose b. 0.9 NaCl c. 2 M CaCl 3. a. Is the rate of osmosis constant Why GOU 50.. 1. Results tube 1. b. What is the relationship between the concentration of sucrose in each bag and the rate of osmosis The

Effective marketing strategies rarely feature O Goals that purposefully raise expectations. O Audaciousness. O Plausible tactics. OA balance between reasonable risk and returns. O Low expectations.

SH le Design Layout hining the Density of an Unknown Alcoholic Beverage 10ml Graduated Cylinder 10ml Volumetric Pipette Mass of Empty 250ml Beaker(g) Mass of 250ml Beaker + Beverage (g) Mass of Beverage (g) Actual Volume of Beverage Used (ml) Density of Beverage (g/ml) Table 2. Table for Determining the Densities of Alcohol Solutions Alcohol

Which set of four quantum numbers corresponds to an electron in a 4d orbital n 4, l 2, m 1, m, n 4, l 1, m 0, ms n 4,1 0, m 3, ms n 4,1 3, m 0, ms Submit Request Answer NIT 2 12 H2,Choose the correct electron configuration for As. O1s22s22p 3s 3p 4s4p O1s2s2p O1s2s2p 3s3p 4s3d O1s2s2p 3s3p 3s3p6 4s3d04p,Choose the correct orbital

Select the correct IUPAC name for the following organic substrate, including the R or S designation where appropriate, and draw the major organic product(s) for the SN 1 reaction. Include wedgeanddash bonds and draw hydrogen on a stereocenter. Br HO The IUPAC name for the substrate is 3bromo3,4dimethylpentane (R)3bromo2,3dimethylpentane

Select the IUPAC name for the following ether. 0000 1methylchloroxypropane propoxychloromethane chloromethoxy propane 1(chloromethoxy)propane

The following selected account balances were taken from ABC Companys general ledgers for July Inventory Notes payable Land Retained earnings Accounts receivable Salaries payable Common stock Accounts payable July 1 43,000 101,000 77,000 39,000 42,000 26,000 85,000 53,000 ABC Companys statement of cash flows for July included the following

Select the correct relationship between Ha and Hb. Hc O Homotopic O Enantiotopic O Diastereotopic Br Hd Ha Hb

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Select the correct proper or common name for the compound. O O CI The compound is named 3chloro3methylpropanoate ion O 3chloro3methylpropanoate 3chlorobutanoate ion 2chlorobutanoate

Write the relevant information on the table. How many holes will the central atom require to Build the indicated models and sketch a 3D accommodate the hybridized orbitals representation of them in the table. Molecule PCl Lewis Structure 6N 2 VE Model VSEPR structure,1) Would you expect phosphorus pentachloride to be a polar molecule Explain why

The scientist starts with four solutions made of watersoluble salts. Solution A contains sodium arsenate. Solution B contains ammonium oxalate. Soution C contains silver chlorate. Solution D contains aluminum bromide. Solution A B D Solute Color of Solution Na, AsO4 colorless (NH4)2CO4 colorless AgClO3 colorless AlBr yellow The results of mixing

Sample calculations FW of CaCO3 100.09 gmol 100.09 mgmmol 1 ppm 1 mgL Lets say you titrate 25 mL of unknown ppm CaCO3 (MDT)(V. in mL)( 100.09mg mmol IL 10 mL (25mL of ukn)( T

In Season 1 of Breaking Bad, Walter White confronts Tuco Salamanca with fulminated mercury. Fulminated mercury Hg(CNO), is primarily used as a trigger for other explosives since it is extremely sensitive to pressure and friction. Walter White decides to throw 50 g of the substance against the floor, which triggers an explosion. The explosion

Sodium chloride, written as NaCl, is what we commonly refer toas table salt. How is a salt defined as it relates to chemistry?What other types of salts exists? Give a few examples. From the graph on Page 1 in the Seawater Chemistry document, thetemperature (C) increases nears the equator and decreases towardsthe poles. Give an explanation why the

For the PCl2-... Explain The Lewis structure The pair arrangement Bond angle Molecular geometry Polar or no polar

For a solute that is dissolved in a solvent to produce asolution: Given the chemical formulas of the solvent and the solute, themass of the solute, the final volume of the solution, the boilingpoint-elevation constant for the solvent, the vapor pressure of thesolution (at 25.0 o C) and the boiling points for the puresolvent and the solution a)

If a solution containing 84.363g of mercury(II) Chlorate isallowed to react completely with a solution containing 14.334g ofsodium sulfide, how many grams of solid precipitate will be formed?How many grams of the reactant in excess will remain after thereaction?

the solubility of Zn3(PO4)2 in water is = 5.9 x 10-5 g/L, with this given information calculate the solubility product constant(Ksp) of this salt. (Molar Mass Zn3(PO4)2 = 386.11g/mol).

A slightly bruised apple will rot in 4.0 days if left on the kitchen counter at 22 degrees celsius (k=1/4 day-1). At what temperature should the apple be refrigerated if you want it to last 14 days before it begins rotting (k=1/14 day-1)? The activation energy for the rotting process is 42.2 kj/mol.

Sodium chloride is also known as table salt. The chemical formula of sodium chloride is NaCl. Calculate the molar mass of sodium chloride.

SHOW ALL WORK using these conversions 1 ft 0.3058 m 1 yd 0.9044 m 1 oz 26.3495 g 1 oz 0.0825 lb 1000g 1kg 1 lb 0.443 kg 1 lb 16 oz 4 qt 1 gal 1 gal 3.775 L 1000mL 1L 8.673 ft into m 9.1486 ounces into kg 8 quarts into mL Convert 673 ft into m SHOW ALL WORK using density massvolume What is the volume of an object that has a mass of

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rome Zoom Canvas 47 weeks x Fasta 47 weeks 1 hour LoboAchieve Submit Answer myUNM I The Uni... References How much will a student earn in 47 weeks if she works for 17 hours each week at a rate of 14hour Set up the problem below and calculate the earnings. Place your conversion factors in order such that weeks cancels first. Review Topics) unm

Which of these represents a chemical change O boiling water to form steam O turning hair yellow with bleach O melting butter O mixing powdered charcoal and oxygen at room temperature O cutting a bar of sodium metal into pieces with a knife,The formula for magnesium sulfate is MnSO4 O MgSO4 O Mn2SO4 O M82504 O MnS

conditions A continuous time system has the following transfer function and initial 1 s4 y(0) 1 Find the complete response of the y(t) if the input is u(t) et,t 0. H(s)

Read, Study Practice Assignment met Open Assignment TIMA Start Time 0430 PMRegn. MENT RESOURCES Exam comResula.2xud action ) HC COH Gradebook ORION Downloadable Textbook 0 Ca C H CHO which of the following is the most stable staggered conformer based on peucheratons and hudrugenbonding intention ON Conformer A Contener are and to sach the O

Reactions of Metals with Acid Metal Ca Part A Was there a reaction with HCI Yes No Submit Previous Answers Correct Part B What did you observe Select all that apply.

Below is the reaction you will be performing today: To perform the synthesis you will be using the following reagents: p -aminobenzoic acid (PABA) ethanol MR = 137.14 g/mol MR = 47.07 g/mol 0.80 g 10 mL (density: 0.789 g/mL) Calculate (to 2 significant figures): No. of moles of PABA: Answer = _____ mol Mass of ethanol: Answer = _____ grams No. of

Rank HO, Ar, and HCI in order of increasing strength of intermolecular forces. Items (3 items) (Drag and drop into the appropriate area) Intermolecular force ranking HO 16 OF 17 QUESTIONS COMPLETED HC No more items 1217 VIEW SOLUTION SUBMIT ANSWE

The reaction of fluorine with water can produce oxygen, O2.The hydrogen and fluorine react to form hydrogen fluoride. Complete and balance the reaction below for the production of oxygen. Do not include state (phase) information. ___F2 +2H2O ----> O2 + _____

Rate Determination and Activation Energy An important part of the kinetic analysis of a chemical reactionis to determine the activation energy, E a .Activation energy can be defined as the energy necessary toinitiate an otherwise spontaneous chemical reaction so that it willcontinue to react without the need for additional energy. Anexample of

Question Which of the following is the best example of a suspension Select the correct answer below salt water An oil slick on the surface of water. mud Ice water is not a suspension because the ice particles are large and they float rather than spreading throughout the volume.

QUESTION 9 The Group 8A elements Oare unreactive and are rarely found in combination with other elements. are liquids at room temperature. are good conductors of electricity. react vigorously with water. QUESTION 10 The product from the alpha decay of O231 Th 90 O233 80 Ra 23 Pu 94 235 93 Np 235 92 U is,QUESTION 11 The process in which a nucleus