Chemistry Questions and Answers June 24, 2020

Consider a piece of semiconductor of length L and uniform rectangular crosssection. It is in equilibrium with no applied biasvoltage, not subjected to any external magnetic fields, and no externallyapplied radiationoptical source. Can there be a potential difference across its two ends If so, under what conditions

2. In circuit A the node voltages have the values shown. If we move the ground to the position shown in circuit B, determine the values of the node voltages at nodes 1, 2, 3, 4, and 5. V3 55V Vs 20V V4 10V V R1 www R1 www R2 R2 www V R3 V Circuit A V3 100V R3 V 100V V Circuit B R4 ww R4 www R5 Vs R5 V 0 v V 1000 V3 55V V4 10 V5 20 v V

A range of technologies from blogs to social networks have extended the reach of the digital revolution to the organization, creating challenges and opportunities that are expected to be compounded over time as social media is further integrated into the organizational landscape. Appraise the types of technologies commonly used in an educational

For the strontium atom, which ionization energy will be most significantly higher than the one previous to it O IE, First Ionization Energy O IE, Second Ionization Energy O IE3 Third Ionization Energy O IE4 Fourth Ionization Energy

Propose an arrow-pushing mechanism for each of the following transformations.

) . 78C H3C. a) b) (CH3),S b) H HBr ....... yogk

2. For the reaction S2(g) 25(g), log10 Kp 16.735 at 1000K, while AH 102600 2.47T 0.444x103T. Find the extent to which S2 (g) will be dissociated into atoms at a temperature of 300OK and 1.5 atm pressure. A) 0.0822 B) 0.282 C) 0.0282 D) 0.582 E) 0.852 F) none of the above O A O B O c F

What volume of oxygen gas is produced when 30.2 g of mercury(II) oxide reacts completely according to the following reaction at 25 C and I atm mercury(II) oxide (s) mercury (1) oxygen(g) liters oxygen gas

How many grams of iron are needed to completely consume 12.6 L of chlorine gas according to the following reaction at 25 C and 1 atm iron (s) chlorine (g) iron(III) chloride (s) grams iron

A plane is flying 2000 feet above sea level toward a mountain. The pilot observes the top of the mountain to be 8 above the horizontal, then immediately flies the plane at an angle of 10 above horizontal. The airspeed of the plane is 100 mph. After 5 minutes, the plane is directly above the top of the mountain. (a) How high is the plane above the

Draw a Lewis Diagram for PCI52 (the sulfur trichloride anion) Draw a VSEPR diagram for PCI52 Indicate the bond dipoles and the net dipole (on the same drawing or on a separate one make sure we can tell what youve drawn.)

Give the bond orders (B.O.) for each bond in the previous ion All bonds have B.O.1 O All bonds have B.O.1.2 All bonds have B.O.1.33 All bonds have B.O.1.4 All bonds have B.O.1.5

The planet Aragonose (which is made mostly of the mineral aragonite, whose composition is CacOs) has an atmosphere containing methane and carbon dioxide, each at a pressure of 0.10 bar. The oceans are saturated with aragonite and have a concentration of Hequal to 1.8x107 M. Given the following equilibria, calculate the concentration of calcium (in

4.) Draw a diagram to represent how the phase transfer catalyst is working to make the nucleophile more nucleophilic in this reaction. 5.) Draw a diagram to show how a phase transfer catalyst might catalyze the Michael addition of butanethiol to cyclopentenone.

Determine the values of IO and VO of Circuit 3 using the method of nodes. 2V0 100 www 2012 ww mu 120V lo 1 100V 40n vo

Equilibrium constant Solution 1 2 3 4 5 Absorbance 0.07 0.20 0.31 0.42 0.50 Initial molarity ( molL) Equilibrium Concentrations Fe3 HSCN FeSCN Fe HSCN FeSCN H Average K. Kc Complete the table above using ICE diagrams to calculate K values. You need only show work for the calculation of K for unknown 1.

How does a CYP2D6 genotype *3/*5 with predicted phenotype of poor metabolizer and a CYP2C19 genotype *1/*1 with predicted phenotype of extensive (normal) metabolizer affect the pharmacogenetics of morphine?

5. Assign E or Z configuration to the following alkenes (a) H3C Cc CH3CH2 CI (b) CH2CH3 cC CH2CH2CH3 CH2OH CH30 (e) CH3 (d) CN co,H H3C CH2NH2 CH2OH

What is the pH of a 1 M HCIO, and 0.5 M NaCIO, solution Ka of HCIO2 is 1.2 x102. O 1.62 O 1.92 O 2.22 O 2.22

When a 1.50g sample of walnuts is burned in a calorimeter, the heat released increases the temperature of 450. g of water from 21.8 C to 44.1 C. What is the energy value (kJg) for the walnuts

Because high fevers can cause convulsions in children, the doctor needs to be called if the childs temperature goes over 40.0 C. Should the doctor be called if a child has a temperature of 103 F

What is the final water temperature if 100. g of water at 15.0C is thoroughly mixed with 250. g of water at 50.0C Assume that the vessel in which the mixing occurs is perfectly insulated.

A 6.22kg piece of copper metal is heated from 20.5C to 324.3C. Calculate the heat absorbed (in kJ) by the metal.

For dinner, you had one cup of clam chowder, which contains 16 g of carbohydrate, 12 g of fat, and 9 g of protein. How much energy, in kilocalories, is in the clam chowder Typical Energy Values for the Three Food Types Food Type kcalg kJg Carbohydrate 4 17 Fat 9. 38 Protein 4 17

A 0.50g sample of vegetable oil is placed in a calorimeter. When the sample is burned, 18.9 kJ is given off. What is the energy value (kcalg) for the oil

A 19.6g piece of metal at 88.7 C is dropped into 42 g of water at 24.2 C. All the heat lost by the metal is used to heat the water, and the final temperature of the water and metal is 27.6 C. Calculate the specific heat, in Jg C, of the metal.

If you want to lose 1 lb of body fat, which is 15 water, how many kilocalories do you need to expend

A 13.0g piece of glass at 64.8 C is dropped into 38 g of water at 22.9 C. All the heat lost by the glass is used to heat the water, and the final temperature of the water and glass is 25.6 C. Calculate the specific heat, in Jg C, of the glass.

All of the following can be obtained from the value of the specific heat of a metal EXCEPT. A. The approximate density of a metal. B. The amount of heat that will be given off when 10 g of a metal cools from 100C to 25C. C. The amount of heat it will take to increase the temperature of 10 g of a metal by 10 K. D. The approximate atomic mass of a

Why does a book have more potential energy when it is on the top of a high table than when it is on the floor A. because the floor has lower potential energy B. because books have high potential energy C. because of its position above the floor.

Water has a higher specific heat than mercury. All of the following statements are consistent EXCEPT A. One pound of water cooled from 80C to 20C will give off the same amount of heat as one pound of mercury cooled between the same temperatures. B. More heat will by given off when one pound of water is cooled by 15C than when the same mass of

Indicate whether each of the following statements describes potential or kinetic energy kinetic energy potential energy does not describe any energy kicking a ball a skier at the top of a hill water at the top of a waterfall the energy in a lump of coal

How can I obtain molarities of the final solutions with this information that I was told to record in Chem 1 Lab? It asks for a molarity of the final solution for EACH part. As in, does (AI) has it's own molarity of the solution and (A2) has its own molarity if the final solution or does A1 and A2 have the same molarity of the solution? Same thing

Which form of energy BEST describe the images shown O Captionless Image Nuclear O Gravitational Radiant ThermalHeat Sound O MechanicalMotion O Gravitational Potential O Chemical O Electrical Civil I Mining O Geodetic

Which form of energy BEST describe the images shown O Captionless Image Nuclear O Gravitational Radiant ThermalHeat Sound O MechanicalMotion Gravitational Potential Chemical Electrical Civil O Mining O Geodetic

Which form of energy BEST describe the images shown O Captionless Image Nuclear Gravitational Radiant ThermalHeat Sound O MechanicalMotion Gravitational Potential Chemical Electrical Civil O Mining Geodetic

Which form of energy BEST describe the images shown O Captionless Image Nuclear O Gravitational O Radiant O ThermalHeat O Sound O MechanicalMotion Gravitational Potential Chemical Electrical Civil O Mining O Geodetic

Which form of energy BEST describe the images shown O Captionless Image O Nuclear O Gravitational Radiant ThermalHeat Sound O MechanicalMotion Gravitational Potential O Chemical O Electrical O Civil O Mining O Geodetic

Name the following alkenes, and tell which compound in each pair is more stable (a) H2CCHCH2CH3 CH3 or H2CCCH3 (b) CH2CH2CH3 Cc or H3C CH2CH2CH3 H3C (c) CH3 CH3 or

A flash drum operating at 50C and 200 kPa is used to separate 1000 kmolh of a feed which contains 30 mol propane, 10 mol nbutane, 15 mol npentane and 45 mol nhexane. Use the RachfordRice equation to find compositions and flow rates of both vapor and liquid product streams. Assume that Raoults law is applicable.

Indicate whether each of the following statements describes potential or kinetic energy

kinetic energy potential energy kicking a ball a skier at the top of a hill water at the top of a waterfall the energy in a lump of coal

Lime is a term that includes calcium oxide (CaO, also called quicklime) and calcium hydroxide Ca(OH)2, also called slaked lime. It is used in the steel industry to remove acidic impurities, in airpollution control to remove acidic oxides such as SO2, and in water treatment. Quicklime is made industrially by heating limestone (CaCO3) above 2000C.

For the following reaction, 5.87 grams of hydrochloric acid are mixed with excess iron. The reaction yields 8.94 grams of iron(II) chloride. iron (s) hydrochloric acid (aq) iron(II) chloride (aq) hydrogen (g) What is the ideal yield of iron(II) chloride grams What is the percent yield for this reaction

S Page view For the pair of functions defined, find (f g)(x), (f g)(x), (fg)(x), and (4)(x). Give the domain of each. See Example 2. 19. f(x) 3x 4, g(x)2x5 21. f(x) 2x3x, g(x)xx3 23. f(x) 4x 1 g(x) 20. f(x)63x, g(x) 4x 1 22. f(x) 4x2x, g(x)x3x2 24. f(x)5x 4, g(x) X

15. Poly(nbutyl acrylate) (a) has a lower T, than poly(methyl methacrylate) (b), because of H. CH3 (CH2C (CH2C COOCH (a) (b) a) weaker intermolecular attractions b) free volume effects due to the flexible side chain c) the stiffness of the side chain. 16. The general chemical structure of aliphatic polyamides is given as NH (CH2) NHCO (CH2),

A student is asked to analyze different aspirin tablets, and determine which ones are past the expiration date. Which test could the student employ, and what would the results show?

1. A can of soda, when frozen, inflates according to the law Choose the best option a. BoyleMariotte b. Charles c. GayLussac d. all of the above 2. When divers ascend to the surface they must expel the air from their lungs, according to the law Choose the best option a. BoyleMariotte b. Charles c. GayLussac d. all of the above

1. The pressure of a helium sample in a 1 L container is 0.988 atm. What is the pressure if the sample is put into a 2 L container? 2. The air trapped in a cylinder fitted to a piston occupies 145.7 mL at a pressure of 1.08 atm. What is the new volume of the air when the pressure increases to 1.43 atm when force is applied from the piston.

A sample of neon gas occupies 0.220 L at 0.860 atm. What will its volume be at a pressure of 29.2 kPa?

1. The temperature in Celsius of a 3L sample of gas is reduced from 80 C to 30 C. What will the new volume of the gas be? 2. What will be the new volume of air in a balloon that occupies 0.620L at 25 C, if the temperature is reduced to 0 C?

A sample of gas at 40 C occupies a volume of 2.32 L. If the temperature is increased to 75 C. What will the volume be, assuming the pressure remains constant?

If we put an egg in the microwave without water, it explodes according to the law Choose the best option: a.Boyle-Mariotte b. Charles c. Gay-Lussac d. all of the above

1. Give the IUPAC names for the following ethers. a. CH3CCCH2OCH3 . CH3 H, Br b. CICH2CH2OCH3 C. f. Br OCH,CH, OCH3 d. g. CH(CH), CH3 2. Write structural formulas for the following compounds. . 2,3heane b. 2methoxypentan3ol c. cyclohexene oxide

1. Give the IUPAC names for the following ethers. a. CH3CCCH2OCH3 . CH3 H, Br b. CICH2CH2OCH3 C. f. Br OCH,CH, OCH3 d. g. CH(CH), CH3 2. Write structural formulas for the following compounds. . 2,3heane b. 2methoxypentan3ol c. cyclohexene oxide

In a tank, the pressure of a gas is 3.20 atm at 22 C, if the temperature increases 60 C, what will be the pressure of the gas in the tank.

In a sealed container, a gas has a pressure of 125 kPa at a temperature of 30 C. If the pressure in the container is increased to 201 kPa, what will the new temperature be?

In a car tire, the pressure is 1.88 atm at 25 C. What will the pressure be if the temperature reaches 37 C.

At 0 C and 1 atm of pressure, a gas sample occupies 30 mL. If the temperature rises to 30 C and the entire gas sample passes into a 20 mL container. What will be the pressure of the gas inside the container?

A cold unopened 2L soda bottle contains 46 mL of confined gas at a pressure of 1.30 atm and a temperature of 5 C. If the bottle falls into a lake and is submerged to a depth where the pressure is 1.52 atm and the temperature is 2.09 C. What will be the volume of the gas contained in the bottle?

2. Which of the following organic compounds would react to 2,4DNP test Indicate YES or NO on the boxes provided below. . b. . CH,OH , HO (a) (b) (c) 3. Which of the follow organic compounds would react to Schiffs test, Benedicts test or Tollens test Indicate YES or NO on the boxes provided below. b. a. C. Ph CH,CH,CCH, CH CHH, CHO CH Schiffs

The air trapped in a cylinder fitted to a piston occupies 145.7 mL at a pressure of 1.08 atm. What is the new volume of the air when the pressure increases to 1.43 atm when force is applied from the piston.

A sample of gas, at an unknown pressure, occupies 0.766 L at a temperature of 298 K. The same gas sample is then tested under known conditions and has a pressure of 32.6 Kpa and occupies 0.644 L at 303 K. What is the original pressure of the gas?

1. Determine the temperature, in celsius, of 2.49 moles of gas contained in a 1L flask at a pressure of 143 kPa. 2. Calculate the volume that a 0.323 mol sample of gas will occupy at 265 K and a pressure of 0.900 atm.

How many grams of gas are in a sample whose molar mass is 70 g / mol and occupies a volume of 2L at 117 kPa and 35.1 C.

In a mixture of gases the partial pressures are: nitrogen 425 torr, oxygen 115 torr, and helium 225 torr. What is the total pressure exerted by the mixture?

A gas mixture containing oxygen, nitrogen and helium exerts a total pressure of 925 torr. If the partial pressures are oxygen 425 Torr and helium 75 Torr. What is the partial pressure of nitrogen in the mixture?

In a mixture of gases the partial pressures are: argon 415 mmHg, neon 75 mmHg and nitrogen 124 mmHg. What is the partial pressure in atm exerted by the gas mixture?

The pressure of a helium sample in a 1 L container is 0.988 atm. What is the pressure if the sample is put into a 2 L container?

In a 5 L balloon, you have a sample that contains 2.43 moles of nitrogen and 3.07 moles of oxygen, at 298K. Determine the total pressure of the gases in the balloon.

A balloon, with a volume of 220 mL, is filled with 2 mol of helium. To what volume the balloon will expand if 3 mol of helium are added to give a total of 5 mol of helium. Pressure and temperature do not change.

Check which gas law is used in this problem and solve it. 1. If a certain mass of gas, at constant pressure, fills a container with a capacity of 20 liters at a temperature of 124 C, what temperature will the same quantity of gas reach at constant pressure, if the volume increases to 30 liters?

Check which gas law is used in this problem and solve it. 1. At a certain temperature and pressure, 8g of oxygen gas in a balloon has a volume of 5 L. What will the new volume in L be after 4g of O2 is added to the balloon?

A soccer ball is a very important implement for a play to have the precision that is needed to win. A balloon has approximately 7.22 L at a pressure of 15.6 psi, if the pressure is increased to 25.6 psi. What will the new volume of the ball be?

Carbon disulfide and carbon monoxide are produced when carbon is heated with sulfur dioxide. 5C(s)+2SO2(g)CS2(l)+4CO(g) How many moles of C are needed to react with 0.500 mole SO2? How many moles of CO are produced when 2.2 moles C reacts? How many moles of SO2 are required to produce 0.55 mole CS2? How many moles of CS2 are produced when 3.0

How many moles of C 2 H 2 are required to produce 0.60 mole H 2 O 2C 2 H 2 + 5O 2 4CO 2 + 2H 2 O

in this equation 2C2H2 + 5O2 4CO2 + 2H2O, how many moles of C2H2 produce

In this equation 2C2H2 + 5O2 4CO2 + 2H2O; how many grams of CO2 produce?

In some valyl peptides, the methyl lines of valine appear as a doublet, sometimes as a triplet, and in the free amino acid, they appear as four lines. Explain CH3 Q CH3 O H3C N. R H3C 3 NH2 OH HN. R I OR

Provide the necessary reagents for the following transformation. Me Me Me Me Me Me.

In a chemical reaction with two reactants, one is added in large excess. How will the concentration of the other reactant become?

In a gas chromatography (GC) separation involving four components, it was discovered that all four components, A, B, C and D, separate cleanly at 80 . At this temperature, A and B have fairly short retention times, but components C and D have very long retention times. It was also discovered that C and D separate cleanly at 150 while that A and B

Starting with cyclohexene and any other reagent you care to use, outline a 3step synthesis of the product shown below. Blank 1 is used for the reagent(s) in the first step, blank 2 is used for the reagent(s) in the second step, etc. You can use names (acetone) or formulas (CH3COCH3) for your reagents. Blank 1 Blank 2 Blank 3

A 5.96x103g gaseous sample of pure substance X occupies a volume of 23.3L at 0.140 Torr, 395.8K. Calculate the molar mass of X. Answer gmol Check A gaseous sample of pure substance Y is found to have a density of 4.540x104 gL at 0.323 Torr, 313.4K. Calculate the molar mass of Y. Answer gmol

The removal of sulfur as sulfur dioxide in petroleum products is based on the process called Claus process and based on the reaction 2H,Slg) SO(g) 35s) 2HO(g) Certain changes (see the list below) are then made to this reaction mixture. Considering each change separately, state the effect (increase, decrease, or no change) that the change has on

2. Use the lab demo videos attached and other relevant references that shows how ions are detected to fill out the data table based on the observed results in the videos. You can also used some of the confirmatory tests in this document that may help you in constructing your schematic diagram and designing of the tests for the unknowns. lon

A spherical volume charge has uniform charge density p and radius a, so that the total charge of the object is Qap. The volume charge is surrounded by a thin shell of charge with uniform surface charge density a, at a radius b from the center of the volume charge. The total charge of the shell is Q476o. Compute and draw the electric field

Fill in the chart with the correct technical values (1 pt each) Half your density 30 KVP 16 MAS 92 KVP 75 KVP 5 MAS 10 MAS 1.6 MAS 69 KVP

1. In basic hydrolysis, Q is converted to Glu. Tryptophan (W) is not affected in basic hydrolysis of protein isolates. 2. DNS oxidized form is the red colored complex of 3-amino-5-nitrosalicylic acid. DNS assay detects the presence of free carbonyl group (C=O) of reducing sugars. A if the 1 st statement is TRUE and the 2 nd statement is FALSE. B

Its 1976 and you are throwing a fondue party You need to heat 800.0 mL of vegetable oil to 375 F (190.0C) using an ethanol burner. Assuming a perfect transfer of heat from the burner to the oil, what mass of ethanol (C2H5OH (I)) is required Assume your kitchen is at SATP (25 C), vegetable oil has a density of 0.920 gml and the specific heat

A balloon filled with 1.00 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.75 atm. What is the volume in liters of the balloon at this depth?

Assuming an efficiency of22.30%,calculate the actual yield of magnesium nitrate formed from145.0 gof magnesium and excess copper(II) nitrate. Mg+Cu(NO3)2Mg(NO3)2+Cu actual yield: _______ g

The virtual lab stockroom contains NaOH, water and an unknown solid weak acid. Perform experiments to identify the pKa and molar mass of the bottle of unknown solid acid. You may enter your answer in the form below the Virtual Lab. NOTE: You can submit your answers up to three times. If all three answers are incorrect, you will be given the

HA Which of the following would react to 2,4Dinitrophenylhydrazine Test (Bradys Reagent)2,4DNP test Explain your answer. a. b. . CH,OH HCCCH,COOH

1. Why does chloromethoxymethane does not follow the IUPAC nomenclature, which is methoxychloromethane 2. Why is the image named cyclohexene oxide, even though there is no alkene present in the structure 3. Why do some names of the organic compounds doesnt follow the IUPAC in naming

1. Give the IUPAC names for the following ethers. a. CH3CCCH2OCH3 . CH3 H, Br b. CICH2CH2OCH3 C. f. Br OCH,CH, OCH3 d. g. CH(CH), CH3 2. Write structural formulas for the following compounds. . 2,3heane b. 2methoxypentan3ol c. cyclohexene oxide

1. Gibbs free energy equation doesnt violate the laws of thermodynamics. Explain. 2. How does the existence and function of ribosomes support the RNA world hypothesis?.