Answers created by Michael

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• If a galvanic cell is produced using a nickel electrode and 1.0 M #Ni^(2+)# along with a silver electrode and 1.0 M #Ag^+#, calculate the concentration of #Ni^(2+)# and #Ag^+# in each compartment once the battery is dead?
  
• How do I find the Voltage of this circuit?
  
• Among transition metal managnese vanadium chromium and iron which is best conductor?
  
• Who's interested in a new Socratic on a different website?
  
• Thoughts on the recent announcement made about the future of the Socratic website? Share them here!
  
• What will be the ph value of buffer solution having 400ml of 0.5MCH3COOH and 800ml of 0.1M CH3COONa which is 1.3% ionised in solution?
  
• Calculate the pH at which bromocresol green indicator would be 50% in its yellow form and 50% in its blue form?
  
• What is the standard enthalpy change for the reaction?
  
• Tommy and Zach are starting out at the same position. Tommy runs north at 3 miles per hour and Zach starts to run east 2 hours later at the rate of 4 miles per hour. How long until Tommy and Zach are 8 miles apart?
  
• Using Coulomb's Law to calculate the energy of a cadmium ion and a sulfide ion at their equilibrium ion-pair separation distance. what do you do?
  
• 79.7g of blue vitriol reacts with KI then find the volume of I2 at STP 4CuSO4+4KI=Cu2I2+2K2SO4+I2?
  
• Prove that a guill shoot 3 times as high when it is fired at an angle of 60 degree as when it is fired at an angle of 30 degrees but at the same horizontal range?
  
• Solve this please ?! Thanks!
  
• The oxidising strength of Cr2O72- is greatest in a solution of pH?
  
• How many hydrogen atoms are present in one molecule of ammonium acetate #NH_4C_2H_3O_2#?
  
• Nuclear Chemistry and Half-life calculations?
  
• Titration question- I just need the answer, unless I got it wrong. Can anyone help please?
  
• Sulfuric Acid with a molarity of .001 has a pH of 2.75. You want to dilute 1mL of this acid to a pH of 5.2. If you want to dilute 1mL of the original solution, what would the final volume of solution be?
  
• Two point charges 4*10^-6C and 2*10^-6C are placed at the vertices A and B of a right angled triangle ABC respectively. B is the right angle, AC=2*10^-2 m and BC=10^-2m. Find the magnitude and direction of resultant electric intensity at C?
  
• The concentration of #"OH"^-# ions in a solution left after mixing #100ml# of #0.1M# #"MgCl"_2# and #100ml# of #0.2M# #"NaOH"# (#K_(sp)" of Mg"("OH")_2=1.2*10^-12#)?
  
• Can you walk me through simple dilutions of 1 M HCL acid? We have 1 Liter of 1 M HCL. I have 5 pieces of metal each about 4 grams. I have 5 containers. One will be all HCL and a control will be all distilled water. I need 75%, 50%, 25% and 10% solutions
  
• You have 25 milliliters of a drink that contains 70% Caffeine. How many milliliters of a drink containing 40% Caffeine needs to be added in order to have a final drink that is 65% Caffeine?
  
• How do you finish the reaction: #Br_2(g) + KCl(aq) ->#?
  
• For the production of hydrated salt such as Fe(NO3)2.6H2O on adding nitric acid to iron sulfides, which is preferable using concentrated or dilute acid?
  
• Is the following equation spontaneous or non spontaneous? Al(s) + Ca2+(aq) -> Al3+(aq) + Ca(s)
  
• Chemistry Problem-- Quantum Mechanics. Help???
  
• Galvanic cell potential ??
  
• Calculate the equilibrium constant for Zn + HgO --> ZnO + Hg (Eo cell = +1.35 V) assuming standard conditions?
  
• Calculate the ΔH reaction?
  
• How many moles of NaOH are present in 26,5 mL of 0.190 M NaOH?
  
• What is the Keq ? ?
  
• What is the concentration of #OH^-# ions in pure water at 20 degrees Celsius?
  
• Calculate pH and pOH of 1.0*10^-7 HCl solution? (hint;use quadratic equation)
  
• Chemistry Question : Solving for the molarity of an acid with the base's molarity already given. Help please?
  
• What is the solubility (in mol/L) of iron (III) in a solution of pH=8.1? The Ksp for this salt is 1.0E-36.
  
• Exactly 17.0 mL of a H2SO4 solution was required to neutralize 45.0 mL of 0.235 M NaOH. What was the concentration of the H2SO4 solution? Given: H2SO4 (aq) + 2NaOH (aq) → 2H2O (l) + Na2SO4 (aq)
  
• Calculate the mass of sodium acetate that must be added to 200.0 ml of a 0.20 M solution of acetic acid to prepare a buffer with a pH value of 4.75? The addition of sodium acetate does not change the overall volume of the solution. (Ka= 1.8 x 10^-5)
  
• Can somebody help me out to solve this as well,it is an iodimetric method.?
  
• At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by θ = (198 rad/s)t – (24 rad/s 2 )t 2 – (2 rad/s 3 )t 3 (15 marks) a. At what time is the angular velocity of the motor shaft zero? b. Ca
  
• Calculate the mass of aluminium produced when a 6.80 A current is applied to AlCl3 (l) for 1.50 hours.,?
  
• How much of water must be added to 300 mL of 0.2 M solution of #"CH"_3"COOH"# for the degree of dissociation of the acid to be doubled? [#"K"_"a"# for acetic acid is #1.8 × 10^-5#]
  
• How is chromium(II) oxide oxidized to #Cr_2O_3#?
  
• What will Cr2(SO4)3(aq)+(NH4)2CO3(aq) produce?
  
• A charge of 2 μC is located 48 cm above the origin. A second charge of -8 μC is located 48 cm below the origin. What is the magnitude and direction of the net electric field 20cm to the right of the origin?
  
• How many grams of #\text{NH}_4\text{OH}# do I need to make #400\ \text{mL}# of a #0.45\ \text{M}# solution of #\text{NH}_4\text{OH}#...?
  
• A certain quantity of electric charge produces 5.0g of silver from an aqueous solution of silver nitrate. When the same amount of charge is passed through an aqueous solution containing the #X^n+# ions , 3.02g of X is produced.,What is the value of n?
  
• Adding a solution of KSCN to a solution of #Fe^{3+}# salt , forms a blood-red complex. What is that complex #K_3[Fe(SCN)_6] \ or \ Fe[Fe(SCN)_6]# ?
  
• In the presence of sodium fluoride, #25cm^3# of 0.4moldm-3 aqueous iron(‖)sulphate requires #25cm^3# of 0.10moldm-3 aqueous potassium manganate(Ⅶ)for complete reaction.What is the final oxidation state of manganese?
  
• Phenylacetic acid (HC8H7O2) is one of the substances that accumulates in the blood of persons with phenylketonuria, an inherited disorder that can cause mental retardation and even death. A 0.033 M solution of HC8H7O2 is found to have a pH of 2.9. ?
  
• The OH- conc. In 10^-7N NaOH Solution?
  
• The scenario: The time is well into a zombie apocalypse, the internet is no longer a thing, and all the vitamin shops have been scavenged. How can one obtain Potassium Iodide? Is it possible to extract it from plants?
  
• What is the final mass of lead electorde?
  
• A reaction has a standard free-energy change of -15.50 kJ mol^-1 (-3.705 kcal mol^-1). how is the equilibrium constant calculated when the reaction is at 25 degrees celsius?
  
• How do you solve this chemistry question? Consider the following reaction at 298 K.
  
• Consider three charges, #q_1=q_2=q_3=q#, at the vertices of an equilateral triangle of side #l#. What is the force on a charge #Q# (with the same sign as #q#) placed at the centroid of the triangle? Solve using parallelogram law of vectors.
  
• If electrode potential of 0.01M Cu^2+/Cu is 0.32V then what will be its E°_RP?
  
• #"Fe"+"O"_2+"H"_2"O"="Fe"_2"O"_3 or "Fe(OH)"_3# Explain. What is the right answer?
  
• Hi!Could someone help me?
  
• HOAc Ka = 1.8 * 10–5 H2CO3 Ka1 = 4.3 * 10–7 Ka2 = 5.6 * 10–11 Which of the following 0.01 M solutions has the highest pH?
  
• Consider the cell Cu/Cu^+2||Ag^+/Ag.If the concentration of Cu^+2 and Ag^+ ions becomes ten times, the emf of the cell is?
  
• 5C2O4 + 2MnO4 + 16H → 2Mn + 10CO2 + 8H2O If 4 mL of 0.001 Μ KMnO4 solution is used to reactcompletely with 250 mL of saturated CaC2O4 solution according to the above reaction, what will be the Ksp of CaC2O4 under the same conditions?
  
• The radius of a sphere is increasing at the rate of 2 m/sec. find the rate of change of the volume with respect to time when radius is 4m?
  
• How to find horizontal distance in projectile motion?
  
• Why cant lead (ii) chloride be prepared by action of dilute hydrochloric acid on lead(ii) carbonate?
  
• A stone is projected from the top tower at an angle of 30 degrees to the horizontal with a velocity of 40m/s. It reaches the ground in 5 seconds. What is the height of the tower and the range of the stone using?
  
• An airplane is heading north at an airspeed of 700 km/hr, but there is a wind blowing from the northeast at 40 km/hr. The plane will end up flying ______(?)degrees off course. The plane's speed relative to the ground will be _____(?)km/hr.
  
• How do I calculate the standard potential of a chemical reaction?
  
• A plane is flying at an altitude of 8000 m at a speed of 250 m/s. At what horizontal distance ahead of its target must a water balloon be released to strike the target on the ground (neglecting air resistance)?
  
• What initial speed must he throw so that it goes through the hoop without striking the backboard?
  
• An electric field of 7.00×10^5 V/m is desired between two parallel plates, each of area 45.0 cm2 and separated by 2.45 mm of air. What charge must be on each plate?
  
• How do you find the equations for the tangent to the curve in the point [-1,-2]?
  
• How to solve Motion Question?
  
• How amount of voltage should be supplieid to holfman voltameter in order to find the composition of water by volume and by mass?
  
• What is an example of entropy from everyday life?
  
• In lab you will be preparing five aqeous solutions of glycerine (C3H8O3), each a different predetermined %(m/m) and each to a total mass of 30 g. How many grams of deionized water should you measure to make your 20 %(m/m) solution for lab?
  
• Question #5cc30
  
• Ionic equation between copper carbonate and sulphuric acid question is that whether copper carbonate dissociates into its ions or not.According to me,it does not but in some papers I have seen that it dissociated into CO^-2 3.Explain?
  
• Will Pu4+ (0.5 M) be reduced to Pu3+ (0.0005 M) by 0.25 M ascorbic acid under 1 M acid conditions at 25 degrees C? (5/5) Pu4+ + e- ⇌ Pu3+ E° = 1.006 V Dehydroascorbic acid + 2H+ + 2e- ⇌ ascorbic acid + H2O E° = 0.390 V
  
• Question #b8da5
  
• An unknown Cu solution was prepared by dissolving 3.1373 g of the sample in a 200.0 mL flask. A 25.00 mL aliquot of this solution was titrated with 0.1084 M Na2S2O4, the titration required 15.93 mL to reach the end point. Calculate the % Cu in the sample?
  
• Question #8ff5d
  
• The pH of 0.010 M o-cresol is 6.05. Find the pKa for this weak acid.? Cresol: C6H4(OH)(CH3)
  
• Question #6fb9d
  
• You are launching a 2-kg potato out of a potato cannon. The cannon is 1.5 m long and is aimed 30 degrees above the horizontal. It exerts a 50 N force on the potato. What is the kinetic energy of the potato as it leaves the muzzle of the potato cannon?
  
• Ferrous ion was dissolved and diluted to250.0mL.25.00mL aliquot of the ferrous ion solution was titrated with0.01000M KMnO4 solution, and the mean of 3 acceptable, corrected titrations volumes was13.84mL.Calculate the mass of Fe in the250.0mL solution?
  
• Question #7cc65
  
• An aluminium foil with a surface area of 500cm2 was anodized. Gow many coulombs of electricity were required to increase the thickness of the layer by 1*10^-3 cm (density of aluminium oxide=4.0g cm-3)?
  
• A voltaic cell consists of a Zn/Zn2+ half-cell and a Ni/Ni2+ half-cell at 25 ∘C. The initial concentrations of Ni2+ and Zn2+ are 1.60 M and 0.130 M , respectively. What is [Ni2+] and [Zn2+] when the cell potential is 0.45V?
  
• Question #d2528
  
• Question #5c760
  
• Question #b160b
  
• How could #"zinc chloride"# be prepared?
  
• A man standing on a wharf is hauling in a rope attached to a boat, at the rate of 4 ft/sec. if his hands are 9 ft. above the point of attachment, what is the rate at which the boat is approaching the wharf when it is 12 ft away?
  
• Question #cd6e9
  
• KMnO4 oxidises #X^n+# to #XO^(3-)#, itself changing to Mn2+ in acidic medium. 2.68x10^-3 mol of X^n+ require 1.61x10^-3 mol of KmnO4. The value of n is?
  
• Sketch and determine the turning points of the curve y=12-12x+12x^2?
  
• Question #5e670
  
• Question #9b43a
  
• A waxed paper capacitor has two parallel plates, each of effective area #800 cm^#2. If the capacitance of the capacitor is #4425 pF#, what is the effective thickness of the paper? The relative permittivity of the paper is 2.5.
  
• Question #b2861
  
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