Chemistry Questions and Answers May 01, 2020

Questions 14 Name the given molecules. Include stereochemistry if appropriate be sure to use any common names CN O,N. OH OH Br

You, as a property investor, are interested in understanding which factor (or factors) drives the prices of investment properties. A dataset is collected which contains the prices (in thousand dollars, as denoted by apart price) for 50 one-bedroom apartments in city X, their corresponding rents per week (in dollars, as denoted by rent) and the

The pH of an aqueous solution of 0.283 M sodium cyanide , Na CN (aq), is . This solution is _________ acidic basic neutral

Calculate the hydronium ion concentration in an aqueous solution of 0.282 M hydrosulfuric acid , H 2 S (aq). [H 3 O + ] = M.

How many grams of solid sodium cyanide should be added to 0.500 L of a 0.121 M hydrocyanic acid solution to prepare a buffer with a pH of 8.538 ? grams sodium cyanide = g.

A solution contains 0.178 M ammonium iodide and 0.122 M ammonia . The pH of this solution is .

The pH of an aqueous solution of 3.0810 -2 M ammonium chloride , NH 4 Cl (aq), is . This solution is _________ acidic basic neutral acidic, basic, or neutral?

The pH of an aqueous solution of 0.123 M ammonium bromide , NH 4 Br (aq), is . This solution is _________ acidic basic neutral Acidic, basic, or neutral?

Write a general expression for the structure factor of a rock salt compound with the composition AB. Assuming that f A=2f B and that the cubic lattice constant is 4.28, draw a schematic of a Laue diffraction pattern that may be observed using radiation with a wavelength of 0.3250 .

Consider a tubular reactor of length L with chemical reactions A B C and B CD. The reactor model is as follows U U U dCB dz dCc dz dCA dz D D U dC z0, uC (0) Cf D 0 dz do 1 0 dC D K CACB 0 dz dCB dz dCD dz dCc dz D KCACB KCBC c 0 kCACB KCBCc 0 d D dz K CB Cc 0 zL, Use Newtons method for numerical solution. Provide the details of

The pH of an aqueous solution of 0.123 M ammonium bromide , NH 4 Br (aq), is . This solution is _________ acidic basic neutral Acidic, basic, or neutral?

What concentration of sodium hydroxide is needed to give an aqueous solution with a pOH of 3.550 ? Molarity of sodium hydroxide = M

A 100.0-mL aliquot of 0.100 M diprotic acid H2A (pK1 = 4.00, pK2 = 8.00) was titrated with 1.00 M NaOH. Find the pH at the following volumes of base added and make a graph of pH versus Vb: Vb = 0, 1, 5, 9, 10, 11, 15, 19, 20, and 22 mL. Kindly nake a graph of pH versus.

When a 19.7 mL sample of a 0.462 M aqueous hydrofluoric acid solution is titrated with a 0.471 M aqueous potassium hydroxide solution, what is the pH at the midpoint in the titration? pH =

1. You will make two solutions with a concentration of about I M (Procedure Part Bi ane B2). Why is it acceptable to make these in beakers rather than a volumetric flasks 2. Identify each of the following household substances as a strong electrolyte, weak electrolyte, or nonelectrolyte salt solution (in water), sugar solution (in water), bieaci,

The pH of an aqueous solution of 0.503 M formic acid , HCOOH is .

The hydronium ion concentration of an aqueous solution of 0.326 M hypochlorous acid (K a = 3.5010 -8 ) is [H 3 O + ] = M.

How many grams of solid ammonium chloride should be added to 1.50 L of a 0.165 M ammonia solution to prepare a buffer with a pH of 8.310 ? grams ammonium chloride = g.

The pH of an aqueous solution of 0.269 M sodium acetate , Na CH 3 COO (aq), is . This solution is _________ acidic basic neutral

The pH of an aqueous solution of 7.7110 -2 M ammonium chloride , NH 4 Cl (aq), is . This solution is _________ acidic basic neutral

The pH of an aqueous solution of 0.291 M ammonium iodide , NH 4 I (aq), is . This solution is _________ acidic basic neutral

The pH of an aqueous solution of 4.3410 -2 M sodium fluoride , Na F (aq), is . This solution is _________ acidic basic neutral

A 23.9 mL sample of a 0.331 M aqueous hydrofluoric acid solution is titrated with a 0.458 M aqueous barium hydroxide solution. What is the pH at the start of the titration, before any barium hydroxide has been added? pH =

When a 28.5 mL sample of a 0.311 M aqueous hypochlorous acid solution is titrated with a 0.311 M aqueous barium hydroxide solution, what is the pH at the midpoint in the titration? pH =

A buffer solution is made that is 0.317 M in H2S and 0.317 M in KHS. If Kal for H2S is 1.00 x 10, what is the pH of the buffer solution pH Write the net ionic equation for the reaction that occurs when 0.078 mol HBr is added to 1.00 L of the buffer solution. (Use the lowest possible coefficients. Omit states of matter. Use H3O instead of Ht)

A buffer solution is made that is 0.351 M in HF and 0.351 M in NaF. If K, for HF is 7.20 x 10, what is the pH of the buffer solution pH Write the net ionic equation for the reaction that occurs when 0.071 mol KOH is added to 1.00 L of the buffer solution. (Use the lowest possible coefficients. Omit states of matter.

A buffer solution is made that is 0.477 M in HF and 0.477 M in NaF. If K, for HF is 7.20 x 10 , what is the pH of the buffer solution pH Write the net ionic equation for the reaction that occurs when 0.108 mol HCI is added to 1.00 L of the buffer solution. (Use the lowest possible coefficients. Omit states of matter. Use H3 0 instead of H)

The pH of an aqueous solution of 7.7110 -2 M ammonium chloride , NH 4 Cl (aq), is . This solution is _________ acidic basic neutral basic, acidic, neutral.

The pH of an aqueous solution of 0.291 M ammonium iodide , NH 4 I (aq), is . This solution is _________ acidic basic neutral acidic, basic, neutral. Please do not answer if you do not know what you are doing.....

The hydroxide ion concentration in an aqueous solution at 25C is 5.510 -3 M. The hydronium ion concentration is M. The pH of this solution is . The pOH is . please help me solve this

Calculate the concentration of HCO 3 - in an aqueous solution of 0.2320 M carbonic acid , H 2 CO 3 (aq). [ HCO 3 - ] = M. please help me with this.

What is the pH at the equivalence point in the titration of a 17.4 mL sample of a 0.329 M aqueous hydrofluoric acid solution with a 0.317 M aqueous barium hydroxide solution? pH = please help me get the right answer. I get more wrong answers on here than right. Waste of money and time.

The pH of an aqueous solution at 25C was found to be 8.30 . The pOH of this solution is . The hydronium ion concentration is M. The hydroxide ion concentration is M.

Use the References to access important values if needed for this question. The hydroxide ion concentration in an aqueous solution at 25C is 2.110 -2 M. The hydronium ion concentration is M. The pH of this solution is . The pOH is .

Calculate the concentration of HCO 3 - in an aqueous solution of 0.2320 M carbonic acid , H 2 CO 3 (aq). [ HCO 3 - ] = M someone answered with 3.05x10^-4 which is the wrong answer. Someone help find the right answer please and thank you:)

The hydronium ion concentration in an aqueous solution at 25C is 7.810 -2 M. The hydroxide ion concentration is M. The pH of this solution is . The pOH is . plz help sos

The hydroxide ion concentration of an aqueous solution of 0.559 M hydrofluoric acid is [OH - ] = M.

The pOH of an aqueous solution of 0.326 M pyridine (a weak base with the formula C 5 H 5 N) is . please help sos

In the laboratory, a general chemistry student measured the pH of a 0.325 M aqueous solution of diethylamine , (C 2 H 5 ) 2 NH to be 12.159 . Use the information she obtained to determine the K b for this base. K b (experiment) =

In the laboratory, a general chemistry student measured the pH of a 0.326 M aqueous solution of pyridine , C 5 H 5 N to be 9.327 . Use the information she obtained to determine the K b for this base. K b (experiment) =

A 1.00 liter solution contains 0.38 moles acetic acid and 0.29 moles potassium acetate . If 0.15 moles of perchloric acid are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of perchloric acid .) _______ True False A. The number of moles of CH 3 COOH will

A 1.00 liter solution contains 0.33 M ammonia and 0.25 M ammonium nitrate . If 0.13 moles of hydroiodic acid are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of hydroiodic acid .) _______ True False A. The number of moles of NH 3 will decrease . _______

A buffer solution contains 0.348 M NH 4 Cl and 0.214 M NH 3 ( ammonia ). Determine the pH change when 0.054 mol KOH is added to 1.00 L of the buffer. pH after addition pH before addition = pH change = please help sos

How many grams of solid sodium fluoride should be added to 0.500 L of a 9.3710 -2 M hydrofluoric acid solution to prepare a buffer with a pH of 3.658 ? grams sodium fluoride = g. please help sos

Calculate the concentration of HC 6 H 6 O 6 - in an aqueous solution of 0.0896 M ascorbic acid , H 2 C 6 H 6 O 6 (aq). [ HC 6 H 6 O 6 - ] = M.

The pH of an aqueous solution of 0.0719 M scorbutic acid , H 2 C 6 H 6 O 6 (aq), is..........

Calculate the hydronium ion concentration in an aqueous solution of 0.294 M carbonic acid , H 2 CO 3 (aq). [H 3 O + ] = M.

The hydroxide ion concentration in an aqueous solution at 25C is 2.110 -2 M. The hydronium ion concentration is M. The pH of this solution is . The pOH is . last one was wrong. please help sos

9. The kinetics of the oxidation of ferrodoxin by oxygen were investigated in a careful series of experiments, shown below at 25 C. 2 FdFe2 (aq) O2 (aq) 2 H (aq) 2 FdFe3 HO2 (aq) What was measured was the absorbance of the FdFe2 at 475 nm after exactly 1 second of reaction, in a 1cm cuvette. The initial absorbance of the solution at 475 nm was

A 1.00-liter solution contains 0.30 moles acetic acid and 0.23 moles potassium acetate . If 0.12 moles of nitric acid is added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of nitric acid .) _______ True False A. The number of moles of CH 3 COOH will remain

A 1.00 liter solution contains 0.42 M ammonia and 0.55 M ammonium bromide . If 0.280 moles of potassium hydroxide are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of potassium hydroxide .) _______ True False A. The number of moles of NH 3 will increase

A 1.00 liter solution contains 0.55 M ammonia and 0.42 M ammonium chloride . If 0.21 moles of hydroiodic acid are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of hydroiodic acid .) _______ True False A. The number of moles of NH 3 will decrease .

A 1.00-liter solution contains 0.55 M ammonia and 0.42 M ammonium chloride . If 0.21 moles of hydroiodic acid is added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of hydroiodic acid .) _______ True False A. The number of moles of NH 3 will decrease . _______

The pH of a 0.551 M solution of sodium methanoate, HCOO Na, is 8.75. Calculate K, for the methanoate ion, HCOO. 1.0x105 5.7x1011 1.8x104 5.7x10 18 O 3.2x109

Find the product of the following reaction.

HO. OLIAI Ha O NABHA

Find the product of the following.

OLIAIH4 O NaBHe, O Kot LiAIHE

Complete the following:

4 Giue the products of the fallowring reachous Nato etter Nat 0 D O HC O KOHEHOH Br O KOHHD NH o BraNoOH

At 5.0 C, the vapor pressure of ice is 3.013 mm Hg and that of liquid water is 3.163 mm Hg. Calculate AG (kJ) for the change of one mole of liquid water at 5.0 C to solid at 5.0 C. (Note Report your answer to three significant digits and use the abbreviated form of the unit)

For the equation, dG V dP S dT, determine the Maxwell relation for the variables in this problem. Select one a. (SGV)p (SGSS)T b. (STSP)v (8SV)T 3D c. (SPST)v (5TSP)S d. (5VST)p (5SSP)T e. (SPSS)v (5TV)P 3D

The normal melting point of naphthalene (molar mass 128.2 gmol) is 80.2 C and it rises by 2.32 C when the pressure increases by 100 atmospheres. The density of solid naphthalene is 1.15 gmL and the density of the liquid is 10 less than the density of the solid. From this information, calculate the enthalpy of fusion (in kJmol) for maphthalene.

In Room 117 Lee Hall chemistry laboratory, a certain liquid was found to have a normal boiling point of 68.9C, initially. When the vapor pressure was decreased by 50, the boiling point of the same liquid was found to be 48.9C. From the information given, determine the heat of vaporization (in kJmol) for the liquid that was in Room 117 Lee Hall.

In a steam engine, 1.00 kilogram of steam undergoes adiabatic expansion from 100 bar and 360C to 1 bar and 160C. Calculate the change in entropy (in kJK) for this process. (Note Report your answer to three significant figures and use the abbreviated form of the unit)

When methyl bromide is reacted with sodium hydroxide, is produced Methanol. I) Name and write a detailed reaction mechanism of this reaction II) Give the rate law for this reaction and state the overall order of this reaction III) What happens to the rate when the concentration of the nucleophile is doubled? iv) What happens to the rate when the

3. Suppose the atmospheric temperature and pressure at the top of a ski run are 5C and 713 mmHg, respectively. At the bottom of the run, the temperature and pressure are 0C and 734 mmHg, respectively. How many more moles of oxygen does a skier take in with a lungful of air at the bottom of the run than at the top Express your answer as a

Describe the relationship between initial rate and enzyme concentration and explain in detail why this relationship is observed?

What physical property determines which solvent sinks to the bottom when performing a liquid-liquid extraction? A. Refractive Index B. Solubility C. Density D. Boiling Point

The polarity of some compounds can be changed using acid-base chemistry. True False

Which of the following is not soluble in dichloromethane ( aka, DCM)? A. Cellulose B. Caffeine C. Benzoic Acid

For the separatory funnel shown in the Student Protocol video, the closed position of the stopcock has the handle of the stopcock in which position? A. Diagonal B. Vertical C. Horizontal D. Removed

1) A sample consisting of 1.00 mol of an ideal gas at 27 C is expanded reversibly and isothermally from an initial pressure of 3.00 atm to a final pressure of 1.00 atm. a. Draw a picture showing this process. Identify the system and surroundings. If you were to run this experiment in the lab, how might you ensure this expansion was isothermal

A.) What is the approximate concentration of free Ag+ ion at equilibrium when 1.4310-2 mol silver nitrate is added to 1.00 L of solution that is 1.080 M in CN-. For [Ag(CN)2]-, Kf = 1.31021.