Aspirin has a pKa of 3.4. What is the ratio of A¯ to HA in: (a) the blood (pH = 7.4) (b) the stomach (pH = 1.4) General comment about the solutions: You have to find the ratio between A¯ and HA so the concentrations are not needed
31 Mar 2020Calculate the pH of the solution that results from the addition of 0.040 moles of HNO3 to a buffer made by combining 0.500 L of 0.380 M HC3H5O2 (Ka = 1.30 x 10¯5) and 0.500 L of 0.380 M NaC3H5O2. Assume addition of the nitric acid has no effect on volume?
31 Mar 2020What is the pH when 25.0 mL of 0.200 M of CH3COOH has been titrated with 35.0 mL of 0.100 M NaOH?
31 Mar 2020A solution containing 50.00 mL of 0.1800 M NH3 (Kb = 1.77 x 10-5) is being titrated with 0.3600 M HCl. Calculate the pH: (a) initially (b) after the addition of 5.00 mL of HCl (c) after the addition of a total volume of 12.50 mL HCl (d) after the addition of a total volume of 25....
31 Mar 2020Q.1. Explain why [BF6] -3 is not formed but [AlF6] -3 is formed. Q.2. What is catenation? Q.3. What is the structure of Borane. Q.4. Why lithium reacts less vigorously in water? Q.5. Which element has strongest reducing character among alkali metals Q.6. What is the trend of...
31 Mar 2020Calculate the ratio of CH3NH2 to CH3NH3Cl required to create a buffer with pH = 10.14
31 Mar 2020Problem 1 A bracket is subjected to the forces and moments shown. Determine an equivalent force-moment system to be applied at point A. In rn Crnekr-5
31 Mar 2020If a force of 5 lb-force is applied to a surface of a piston and the pressure measured is 4 kPa, what is the diameter of the piston in inches?
31 Mar 2020Given that μ = 1.11 K atm-1 for carbon dioxide, calculate the value of its isothermal Joule-Thompson coefficient. Calculate the energy that must be supplied as heat to maintain a constant temperature when 12.0 mol CO2 flows through a throttle in an isothermal Joule-Thompson exper...
31 Mar 2020how do you find the linear speed of the bottom of a test tube in a centrifuge if the centripetal acceleration there is 53Ã—104 times the acceleration of gravity The distance from the axis of rotation to the bottom of the test tube is 73 cm
31 Mar 2020If 25.0 mL of a 0.100 M aqueous sodium hydroxide is mixed with 25.0 mL of a 0.100 M aqueous hydrochloric acid in a calorimeter at an initial temperature of 23.0 degrees Celsius, what is the enthalpy change of this reaction if the final temperature reached in the calorimeter is 25...
31 Mar 2020In terms of binding energies, explain why cations usually form by losing valence electrons and generally retain their core electrons
31 Mar 2020Methane has a Henry’s Law constant (k) of 9.88 x 10^-2 mol/(L x atm) when dissolved in benzene at 25 degrees C. How many grams of CH4 will dissolve in 3.00L of benzene if the partial pressure of CH4 is 1.48 atm?a) 0.0667gb) 0.146gc) 2.34gd) 4.38ge) 7.02g
31 Mar 2020Mg(OH)2(s)Mg2(aq) 2OH-(aq)Formulate the expression for the equilibrium constant, K(sp), for the above reaction and why is it possible to dissolve significant amounts of Mg(OH)2 in solutions in which the concentration of either Mg2or OH- is very small, explain using K(sp)?Explain...
31 Mar 2020Phosgene (COCl2) is a toxic substance that forms readily from carbon monoxide and chlorine at elevated temperatures: CO (g) Cl2 (g) ⇋ COCl2 (g). If 0.450 mol of each reactant is placed in a 0.500 L flask at 600 K, what are the concentrations of all three substances at equilibrium...
31 Mar 2020A circular pizza of radius R has a circular piece of radius R/2 removed from one side as shown in the figure below. The center of gravity has moved from C to C along the x axis. Show that the distance from C to C is R/6. Assume the thickness and density of the pizza are uniform t...
31 Mar 2020Consider the following distribution of objects: a 4.00-kg object with its center of gravity at (0, 0) m, a 3.20-kg object at (0, 3.00) m, and a 5.40-kg object at (5.00, 0) m. Where should the fourth object of mass 7.00 kg be placed so that the center of gravity of the four-object...
31 Mar 2020What volume of carbon dioxide (CO2) will be produced if 2.90 moles of iron (Fe) is produced?Given unit: ____________ Answer unit: ____________ Solution:B. What mass of iron (Fe) can be obtained from 3.80 g iron (III) oxide (Fe2O3) reacting with excess carbon monoxide (CO)?Given u...
31 Mar 2020Q2: Below is an analysis scheme for a mixture of Co2, Cu2, Fe3, and Ni2. You are asked for the formula of each cited precipitate and for the formula of the cation in the final solution. Include the net ionic chemical equations for the precipitation reactions. Step 1. In test-tube...
31 Mar 2020Question 1:A method for producing pure copper metal involves the reaction of copper (I) Sulfide with oxygen gas to give copper metal and sulfur dioxide. Suppose the yield of this reaction is 87%. What mass of a copper ore consisting of 46% copper (I) Sulfide must be mined in orde...
31 Mar 2020Radioactive gold-198 is used in the diagnosis of liver problems. The half-life of this isotope is 2.7 days. If you begin with a 5.6 sample of the isotope, how much of this sample remains after 3.0 days?
31 Mar 2020Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?a) 0.310 mb) 0.690 mc) 1.24 md) 12.4 me) 25.0 m
31 Mar 2020Starting with an initial speed of 5.00 m/s at a height of 0.300 m a 1.50 kg ball swings downward and strikes a 4.60 kg ball that is at rest, as the drawing shows. Assuming that the collision is completely inelastic and instantaneous, how high does the combined mass swing after th...
31 Mar 2020The drill used by most dentists today is powered by a small air-turbine that can operate at angular speeds of 350000rpm. These drills, along with ultrasonic dental drills, are the fastest turbines in the world-far exceeding the angular speeds of jet engines. Suppose a drill start...
31 Mar 2020The mass of a copper atom is 1.06 Ã— 10−25 kg, and the density of copper is 8 920 kg/m3.(a) Determine the number of atoms in 1 cm3 of copper.(b) Visualize the one cubic centimeter as formed by stacking up identical cubes, with one copper atom at the center of each. Determine the ...
31 Mar 2020Nonpolar solute dissolves rapidly in the nonpolar solvent than the polar solvent. give a reason and also describe the interaction between solute and solvent molecules.
31 Mar 2020The Sun radiates energy at a rate of about 4Ã—1026W. Earth is about 150Ã—106km from the Sun. Estimate the energy coming to Earth from the Sun each second. The radius of Earth is about 6400 km. Express your answer in Joules.
31 Mar 2020A 1500 kg car moving on a flat, horizontal road negotiates a curve. If the radius of the curve is 35m and the coefficient of static friction between the tires and dry pavements is 0.523, find the maximum speed the car can have and still make the turn successfully
31 Mar 2020A 3.80 cm Ã— 5.70 cm rectangle lies in the XY-plane. What is the electric flux through the rectangle if E⃗ =( 120 I ^ 100 k^)N/C?
31 Mar 2020A 55-kg woman and an 80-kg man stand 10.0 m apart on frictionless ice. If each holds one end of a rope, and the man pulls on the rope so that they meet, how much rope did he pulled how far did see move?
31 Mar 2020What must happen to Mike’s intrapulmonary pressure in order for him to maintain normal airflow during inhalation and exhalation when he is having one of his asthma attacks?
31 Mar 2020What types of the mass wasting plague the state of California? Describe the various reasons why mass wasting commonly occurs there. What advice might be given to land developers in California to reduce the risks of mass wasting?
31 Mar 2020) A 75.0 kg skier rides a 2830-m-long lift to the top of a mountain. The lift makes an angle of 14.6with the horizontal. What is the change in the skierâ€™s gravitational potential energy? 3) A. 47.0-g is launched straight up with an initial speed of 52.4m/s. Neglect air resistan...
31 Mar 2020a. A 0.80 kg coconut is growing 10 m above the ground in its palm tree. The tree is just at the edge of a cliff that is 15 m tall. What would the maximum speed of the coconut be if it fell to the ground at the base of the tree? Show all your work!b. What would the maximum speed b...
31 Mar 2020When 220 g of NaOH and 210 g of H2SO4 are mixed and react according to the reaction 2NaOH H2SO4 —–> Na2SO4 2H2O, Which is the limiting reagent? How many grams of excess reactant remain unreacted?
31 Mar 2020A cannon fires a shell straight upward; 1.9 s after it is launched, the shell is moving upward with a speed of 16 m/s. Assuming air resistance is negligible, find the speed (magnitude of velocity) of the shell at launch and 4.9 s after the launch. (a) at launch m/s (b) 4.9 s afte...
31 Mar 2020A mixture consisting of 0.160 mol H2 and 0.160 mol I2 is brought to equilibrium at445∘C in a 3.20 −L flask.H2(g)I2(g)⇌2HI(g)KC = 50.2 at 445∘what is the equilibrium amount of H2? What is the equilibrium amount of I2? What is the equilibrium amount of HI?
31 Mar 2020Write down three or more population groups for whom you would use a water exercise therapy program? What types of movement routines would you perform?what types of strength training would you incorporate? What precautions would you take?
31 Mar 2020Critically analyze the following three popular training systems bigger, faster, stronger (BFS), CrossFit, &high intensity training (HIT).how do they compare to the seven laws of training? Which of these systems of training would be appropriate for you? Why
31 Mar 2020A person of mass 75 kg stands at the center of a carousel of radius 3 m and moment of inertia 920 kgm2. The platform is rotating at a rate of 2 rad/sec. Calculate the angular momentum of the person (who can be treated as a point mass) and the carousel. The person now walks toward...
31 Mar 2020Define three energy pathways. For each pathway, identify two exercises that utilize the pathway. If you were training to run a marathon which pathway would be focal point of your training? what types of activities would you incorporate into your marathon training and why? How wil...
31 Mar 2020A proton moves at 0.740c. (a) Calculate its rest energy. MeV (b) Calculate its total energy. MeV (c) Calculate its kinetic energy. MeVHow can I find the value for mass
31 Mar 2020A single force with x-component Fx acts on a 500 g object as it moves along the x-axis. A graph of Fx versus t is shown in (Figure 1). Draw an acceleration graph (ax versus t) for this object. Here is the graph. Thx! https://session.masteringphysics.com/problemAsset/2311212/3/1.j...
31 Mar 2020a spoon was silver-plated electrolytically in an AgNO3 solution. If 0.750g of Ag was deposited on the spoon at a constant current of 20.0mA, how long in hours did the electrolysis take?
31 Mar 2020A.22 rifle bullet, traveling at 350 m/s, strikes a block of softwood, which penetrates to a depth of 0.130m. The block of wood is clamped in place and doesn’t move. The mass of the bullet is 1.80g. Assume a constant retarding force. How much time is required for the bullet to sto...
31 Mar 2020An airplane is moving with respect to the earth with a speed of 600 m/s. As determined by earth clocks, how long will it take for the airplanes’ clock to fall behind by two microseconds
31 Mar 2020An aqueous solution of unoxygenated hemoglobin containing 5 g of protein (M= 64000 g/mol) in the 100cm3 of the solution is placed in an insulated vessel. When enough molecular oxygen is added to the solution to completely saturate the hemoglobin, the temperature rises 0.031-degre...
31 Mar 2020AN electron moves with a speed of 8.0 x 10^6 m/s along the x axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60 degrees to the x axis and lying in the XY plane. Calculate the magnetic force of the electron.
31 Mar 2020An object with a height of 46 cm is placed 2.1 m in front of a concave mirror with a focal length of 0.50 m.Part.A Find the location of the image produced by the mirror using the mirror and magnification equations. Express your answer using two significant figures.Part.B Find the...
31 Mar 2020
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