1. CHEMISTRY HELP !!!!

    Al3+ is reduced to Al(s) at an electrode. If a current of 2.75 ampere is passed for 36 hours, what mass of aluminum is deposited at the electrode? Assume 100% current efficiency. a. 9.2 x 10–3 g b. 3.3 x 101 g c. 9.9 x 101 g d. 1.0 x 102 g e. 3.0 x 102 g

    asked by Anonymous on May 7, 2014
  2. CHEMISTRY HELP !!!! CHECK !!!

    Al3+ is reduced to Al(s) at an electrode. If a current of 2.75 ampere is passed for 36 hours, what mass of aluminum is deposited at the electrode? Assume 100% current efficiency. a. 9.2 x 10–3 g b. 3.3 x 101 g c. 9.9 x 101 g d. 1.0 x 102 g e. 3.0 x 102 g

    asked by YULCHANG on May 8, 2014
  3. Chem Check Please!!!

    1) Calculate the cell potential, at 25 C, based upon the overall reaction Zn2+(aq) + 2 Fe2+(aq) -> Zn(s) + 2 Fe3+(aq) if [Zn2+] = 1.50 x 10^-4 M, [Fe3+] = 0.0200 M, and [Fe2+] = 0.0100 M. The standard reduction potentials are as follows: Zn2+(aq) + 2

    asked by Chris on May 3, 2014
  4. AP Chem

    An electrochemical cell consists of a nickel metal electrode immersed in a solution with [Ni2+] = 1.0 M separated by a porous disk from an aluminum metal electrode. (a) What is the potential of this cell at 25°C if the aluminum electrode is placed in a

    asked by Halie on April 1, 2011
  5. College Physics

    Current passes through a solution of sodium chloride. In 1.00 second, 2.68 x 10^16 Na+ ions arrive at the negative electrode and 3.92 x 10^16 Cl-ions arrive at the positive electrode. What is the current passing between the electrodes? Current = mA What is

    asked by Lanise on February 6, 2010
  6. College Physics

    Current passes through a solution of sodium chloride. In 1.00 second,2.68 x 10^16 Na+ ions arrive at the negative electrode and 3.92 10^16 Cl- ions arrive at the positive electrode. What is the current passing between the electrodes? mA What is the

    asked by Lanise on February 6, 2010
  7. chemistry

    Calculate the amount of silver deposited at cathod when 5 ampere of current is passed for 50 minutes through a solution of AgNO3

    asked by ali on March 12, 2017
  8. Science

    Al+(Cr2O7)2- = Al3+ + Cr3+ [al3+]=0.01M [(cr2o7)2-]= 0.1M [cr3+]=0.001M find the E cell if we add Naoh to each electrode until al(oh)3 precipitates pH=8 KPT of al(oh)3=5 * 10 -33 Eal=-1.66 V Ecr=1.33V

    asked by Lorela on February 20, 2016
  9. Chem

    Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' constant: 96500 C/mol e-)

    asked by Sarah on July 5, 2016
  10. Physics

    Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' constant: 96500 C/mol e-) Please and thank

    asked by Sarah on July 5, 2016
  11. Chemistry

    For How Long Must A Current Of 1.5 Ampere Be Passed Through An Aqueous Solution Of A Copper Salt During Electrolysis In Order To Deposit 2.50g Of Copper (cu=63.5)

    asked by Franklin on June 27, 2017
  12. Pre-Calc

    The wattage rating of an appliance W varies jointly as the square of the current I and the resistance R. If the wattage is 1.5 watts when the current is 0.1 ampere and the resistance is 150 ohms, find the wattage when the current is 0.3 ampere and the

    asked by Jackie on October 5, 2017
  13. chemistry

    a current is passed through 500 mL of a solution of CaI2. the following electrode reactions occur: anode: 2I- ---> I2 + 2e- cathode: 2H2O + 2e- ---> H2 + 2OH- after some time, analysis of the solution shows that 35.7 mmol of I2 has been formed. a) how many

    asked by Leah on June 18, 2012
  14. chemistry

    The mercury cell is still sometimes used in industry to prepare chlorine, Cl2, and caustic soda, NaOH. (a)In the first stage of the process a solution of sodium chloride is electrolysed using a voltage of 4.00V. Chlorine gas is obtained at one of the

    asked by Anonymous on March 27, 2010
  15. Physics

    Calculate the amount of copper deposited in a zinc/Copper electrode of electrolytic cell when 2.5A of electric current is passed in 10 minutes?

    asked by Ibrahim Badamasi on May 19, 2019
  16. Science

    What are fuses and why do they come in different sizes? Fuses are devices placed in electrical circuits as protection for those circuits. They consist of small pieces of wire, sometime as ribbons, and are placed in series with the circuit so that the

    asked by Bethan on September 28, 2006
  17. Chemistry

    A direct-current power supply of low voltage (less than 10 volts) has lost the markings that indicate which output terminal is positive and which is negative. A chemist suggests that the power supply terminals be connected to a pair of platinum electrodes

    asked by Confused on May 1, 2012
  18. Chemistry/Redox Reactions

    An electrochemical cell consists of a nickel metal electrode immersed in a solution with [Ni2+] = 1.0 M separated by a porous disk from an aluminium metal electrode immersed in a solution with [Al3+] = 1.0 M. Sodium hydroxide is added to the aluminium

    asked by Hanna on August 18, 2008
  19. chemistry

    Molten Al2O3 is reduced by electrolysis at low potentials and high currents. If 1.5 x 10^4 amperes of current is passed through molten Al2O3 for 8.0 hours, what mass of Al is produced? Assume 100% current efficiency? Mdep = ([1.5 x 10^ x 28800s ]/ 96500) x

    asked by jess on October 7, 2016
  20. Chemistry

    Suppose a galvanic cell contains one nickel electrode and one copper electrode. At 25°C, nickel has a negative reduction potential and copper has a positive reduction potential. At which electrode will reduction occur? Explain. I believe the copper will

    asked by Morgan on February 19, 2015
  21. Physics, Math, Electronics

    PROBLEM: A typical 12-volts battery is rated according to "ampere-hrs". A 70-Ampere-hour battery for example, at a discharge rate of 3.5-Ampere has a life of 20 hrs. Questions: a.) assuming the voltage remains constant, obtain the energy and power

    asked by Huck on September 23, 2009
  22. Chemistry -please help!

    A zinc-copper battery is constructed as follows at 25°C. Zn|Zn^2+ (0.15 M)||Cu2+(3.00 M)|Cu The mass of each electrode is 200. g. a) Calculate the cell potential when this battery is first connected. - i got this to be 1.14V b.) Calculate the cell

    asked by Mandy on April 28, 2011
  23. Chemistry

    A zinc-copper battery is constructed as follows at 25°C. Zn|Zn^2+ (0.15 M)||Cu2+(3.00 M)|Cu The mass of each electrode is 200. g. a) Calculate the cell potential when this battery is first connected. - i got this to be 1.14V b.) Calculate the cell

    asked by Pamela on April 28, 2011
  24. Physics

    A 14.1 μF capacitor is charged to a potential of 45.0 V and then discharged through an 80.0 Ω resistor. (a) How long after discharge begins does it take for the capacitor to lose 90.0% of the following? (i) its initial charge in seconds (ii) its initial

    asked by Alyssa on February 18, 2016
  25. Chem. help please

    A zinc-copper battery is constructed as follows at 25 degree C: Zn | Zn2+(0.15 M) || Cu2+(1.70 M) | Cu The mass of each electrode is 250. g. I found the cell potential to be 1.13V and the cell potential after 5.00 A of current has flowed for 8.00 h is

    asked by Puja on March 10, 2012
  26. physics

    Choose the correct description for each "Law" of Electricity & Magnetism. The choices are faradays law lenz law ampere law are my choices correct Gives the amount of current resulting from a changing magnetic field.AMPERE LAW Gives the strength of the

    asked by Ana on May 1, 2011
  27. Chemistry

    calculate cell potential at 25C for: 3Fe3+(aq) + AL(s)= 3Fe2+(aq)+ Al3+ (aq) if Fe3+ = 0.300 M, Fe2+ = 0.150M Al3+ = 0.300M. The standard reduction potentials are as follows: Fe3+ (aq) + e- = Fe2+ (aq) Al3+ (aq) + 3e-=Al (s) Eo = +0.771 V Eo = -1.66 V

    asked by Helen on October 18, 2010
  28. Physics

    An electric heater supplied at 40 Volt's draws a current of 5 ampere. If it is now connected to a 120 Volt supply, find the value of current being drawn ?

    asked by Kartik on November 20, 2016
  29. physics

    Three similar ideal cells (no internal resistances) supply current of 0.5 Ampere to a 10 Ohms resistor when they are in the parallel.How much current will they supply to the same risistor when they are connected in series aiding?

    asked by nitz on September 30, 2012
  30. physics

    Three similar ideal cells (no internal resistances) supply current of 0.5 Ampere to a 10 Ohms resistor when they are in the parallel.How much current will they supply to the same risistor when they are connected in series aiding?

    asked by nitz on September 30, 2012
  31. chem

    From the following list, identify the ions that are more easily reduced than H+. Fe2+(aq) Al3+(aq) Cr3+(aq) Ag+(aq) Sn4+(aq)

    asked by sarah on April 9, 2013
  32. Ap Chemistry

    Suppose a galvanic cell contains one nickel electrode and one copper electrode. At 25°C, nickel has a negative reduction potential and copper has a positive reduction potential. At which electrode will reduction occur? - I believe copper will be oxidised

    asked by Damien on February 2, 2018
  33. chemistry..

    (1) The same quantity of electricity is passed through 2voltameters connected in series, one copper voltmeter with copper electrode in a copper(ii) tetraoxosulphate(vi) solution. The other platinum electrode in a dilute solution of tetraoxosulphate (vi)

    asked by dannystein on February 13, 2016
  34. chemistry

    (1) The same quantity of electricity is passed through 2voltameters connected in series, one copper voltmeter with copper electrode in a copper(ii) tetraoxosulphate(vi) solution. The other platinum electrode in a dilute solution of tetraoxosulphate (vi)

    asked by dannystein on February 12, 2016
  35. 2 more physics questions I need help on, please?

    In which of these situations does more charge flow past a given point on a wire? a. Current of 4 A in 1 min b. Current of 2 A in 0.5 min c. Current of 8 A in 2 min d. All are the same charge I think the answer is C? Since the formula for finding current is

    asked by physicsclass on April 23, 2011
  36. chemistry

    Part A Identify the anode and cathode, and indicate the direction of Na+ ion and NO3 - ion flow from the salt bridge. 1) Al is the anode and Co is the cathode; Na+ ions flow into half-cell compartment (A) and NO3 - ions flow into half-cell compartment (B).

    asked by university on April 24, 2013
  37. Chemistry

    Which of the following ions can be reduced from an aqueous solution? A)Ba2+ B)Al3+ C)Sn2+ D)Na+ Do I look for the higher volts? Thanks in advance.

    asked by sh on November 18, 2009
  38. Chemistry

    Which statement is true for the cell as it discharges? Zn | Zn2+(1 .0 M) || Sn2+(1.0 M) | Sn (A) Oxidation occurs at the tin electrode. (B) Electrons will flow from the tin electrode to the zinc electrode. (C) The concentration of Zn2+ will increase. (D)

    asked by LT on May 12, 2008
  39. Chemistry

    For the following battery: Cd(s) | CdCl2(aq) || Cl–(aq) | Cl2(l) | C(s) (a) Write the reduction half-reaction occuring at the C(s) electrode. (Include physical states of reactants and products.) C(s) electrode:? (c) Calculate the mass of Cl2 consumed if

    asked by Linda on May 6, 2013
  40. science

    How long does it take to prepare 4.00 g of Al by electrolysis of Al2O3 using a current of 2.50 ampere?

    asked by Andrea on April 18, 2013
  41. science

    what is the power dissipated by a 10 ohm resistor through which a 2 ampere current is flowing?

    asked by harold on June 10, 2011
  42. Chemistry

    In a dry cell, MnO2 occurs in a semisolid electrolyte paste and is reduced at the cathode. The MnO2 used in dry cells can itself be produced by an electrochemical process of which one half-reaction is shown below. Mn2+(aq) + 2 H2O(l) MnO2(s) + 4 H+(aq) + 2

    asked by Anusha on May 4, 2015
  43. basic engineering electricity

    At what current drain does the ampere-hour Energizer d cell drop to 75% of its value at 25mA?

    asked by kali on January 29, 2012
  44. college chemistry

    A zinc-copper battery is constructed as follows: Zn | Zn+2(0.10 M) || Cu+2 (2.50 M)| Cu The mass of each electrode is 200.0 g. Each half cell contains 1.00 liter of solution. a) Calculate the cell potential when this battery is first connected. b)

    asked by Stephanie on April 28, 2010
  45. Physics

    The wire in the drawing carries a current of 14 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 33 A. Use Ampere's law to find the magnitude of the magnetic field at a distance of r = 1.0 m

    asked by Mareena on February 12, 2012
  46. Physics 2

    The wire in the figure below carries a current of 12 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 30 A. Use Ampère's law to find the magnitude of the magnetic field at a distance of r =

    asked by Anne on February 13, 2012
  47. Physics 2

    The wire in the figure below carries a current of 13 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 26 A. Use Ampère's law to find the magnitude of the magnetic field at a distance of r =

    asked by Kellsey on March 2, 2011
  48. Physics 2

    The wire in the figure below carries a current of 13 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 26 A. Use Ampère's law to find the magnitude of the magnetic field at a distance of r =

    asked by Kellsey on March 2, 2011
  49. Physics

    The wire in the drawing carries a current of 13 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 28 A. Use Ampere's law to find the magnitude of the magnetic field at a distance of r = 0.76 m

    asked by Anonymous on February 25, 2013
  50. algebra

    the current in an electrical conductor varies inversely as the resistance of the conductor. If the current is 12 ampere when the resistance is 240 ohms, what is the current when the resistance is 540 ohms

    asked by stacy on February 9, 2014
  51. Chemistry

    Write so the charges are equal Li+ and OH1- Ca2+ and O2- Al3+ and PO43- Na1+ and S2- Zn2+ and Cl1- Al3+ and 02-

    asked by Austin on February 24, 2019
  52. Physics-Ohms Law

    Will you check my answers please? A volt is a unit of current and an amprere is a unit of current. It is common to call electric potential difference- voltage A current of 1 ampere is a flow of charge at the rate of 1 coulomb per second. When a charge of

    asked by Jennifer on October 24, 2007
  53. precal

    Suppose the Cu electrode was replaced by an Al electrode. In order for this new cell to be a galvanic cell, which electrode would be the anode, Zinc or Aluminum?

    asked by Anonymous on May 28, 2015
  54. chemistry help

    Suppose the Cu electrode was replaced by an Al electrode. In order for this new cell to be a galvanic cell, which electrode would be the anode, Zinc or Aluminum?

    asked by Anonymous on May 16, 2015
  55. electric chem

    What is the reduction potential for the half-reaction Al3+(aq) + 3e- Al(s) at 25°C if [Al3+] = 0.10 M and E° = –1.66 V?

    asked by ibbi on June 20, 2010
  56. Chem 2

    A voltaic cell consists of an Al/Al3+ half-cell and a Cd/Cd2+ half-cell. Calculate {Al3+} when {Cd2+} = 0.401 M and Ecell = 1.299 V.Use reduction potential values of Al3+ = -1.66 V and for Cd2+ = -0.40 V.

    asked by Sandra Caldwell on April 12, 2018
  57. Chemistry

    Which of the following species is the strongest oxidizing agent under standard state conditions? a. Ag+(aq) b. H2(g) c. H+(aq) d. Cl2(g) e. Al3+(aq) An oxidizing agent is a substance that gains electrons in a redox chemical reaction. I think Al3+ has a

    asked by Jason on March 10, 2009
  58. College Chemistry

    How many grams of Al would be deposited from an aqueous solution of Al3+ with a current of 1.430A after 5hrs of deposition.

    asked by Jude on May 3, 2011
  59. gen chem

    what must be the current in amperes to plate out 7.437g of Al from am aqueous solution of Al3+ in 5.4x10^2 minutes?

    asked by Chem on May 8, 2010
  60. hvac

    if the current is one half ampere when the resistance is 240 ohms, what is the current when the resistance is 540 ohms?

    asked by vincent on January 6, 2015
  61. physics

    A uniform sheet of surface current density Ks=Ky ay in z=0 plane. find the magnetic field strength H everywhere using ampere's law.

    asked by amgad on June 8, 2013
  62. chemistry

    how many electrons flow through a wire in 83.9 seconds if the current was 0.32 amps? ( an ampere is a coulomb/sec)and the charge on an electron is 1.602×

    asked by jesse on September 8, 2012
  63. Physics

    A long, straight wire with a circular cross section of radius R carries a current I. Assume that the current density is not constant across the cross section of the wire, but rather varies as J=αr, where α is a constant. A) By the requirement that J

    asked by Ayaka on October 31, 2016
  64. Physics

    A circuit consists of a self inductor of L=0.003 H in series with a resistor R1=5 Ohm. Parallel to these is a resistor R2=10 Ohm. A battery of V0=9 volt is driving the circuit. Current has been running for 10 minutes. (a) How much energy (in Joules) is now

    asked by abdul rahman on April 9, 2013
  65. Chemistry

    Determine the cell potential (in V) for a platinum electrode in an acidic solution of 0.004M H+(aq), 3.226M ClO4-(aq) and 4.445M ClO3- (aq) ions, coupled to a gold electrode in 3.238 M Au3+ (aq) at 307.10 K. Im confused about the mulitple molarities given

    asked by Matt on March 1, 2008
  66. Chemistr repost

    Determine the cell potential (in V) for a platinum electrode in an acidic solution of 0.004M H+(aq), 3.226M ClO4-(aq) and 4.445M ClO3- (aq) ions, coupled to a gold electrode in 3.238 M Au3+ (aq) at 307.10 K. Im confused about the mulitple molarities given

    asked by Matt on March 1, 2008
  67. chemistry

    Given the following list from the activity se- ries of metals (from most active to least ac- tive) K, Na, Al, Mn, Cr, Cd, Co, Pb, Hg which reaction would you NOT expect to oc- cur? 1. Na(s) +Mn2+(aq) ! Na+(aq) +Mn(s) 2. Co2+(aq) + Al(s) ! Al3+(aq) + Co(s)

    asked by Chandler on September 29, 2011
  68. Chemistry

    How many hours will it take to produce 78.0 g of Al metal by the reduction of Al3+ in an electrolytic cell with a current of 2.00 Amperes? [Enter only a number for your answer.]

    asked by Diana on November 15, 2010
  69. Physics

    A simple motor has N=250 turns of wire on a coil measuring 12 cm \times \, 4 cm. It's resistance is R=10 ohms. The magnetic field is B=1 T. (a) How much current (in Ampere) in the coil is needed to produce a maximum torque of 40 Nm? b) What maximum EMF (in

    asked by Phy on April 6, 2013
  70. english

    I have to write an English paper discussing a current event; I chose Obama Care, but was told it is not a current event. I know the bill was passed in 2014, but discussions are still being posed about it and there are continuing developments, so why is

    asked by laura on December 10, 2013
  71. chemistry

    Plastic articles can be chromium-plated by coating them with thin layer of graphite paste,placing them in a bath of aqueous chromium(III) sulphate and electroplating. a)Suggest a reason why the article is first coated with graphite. b)what substance could

    asked by harish on March 10, 2013
  72. physics 2

    A long wire carries a current of 1 ampere.Find the magnitude of the magnetic field 2 meter away from the wire.

    asked by ace on September 24, 2012
  73. Chemistry ASAP

    Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+ (aq) solution

    asked by Tyler on May 13, 2014
  74. Chemistry

    Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+(aq) solution

    asked by CHEM HELP ASAP on May 13, 2014
  75. Chemistry

    1) Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+(aq) solution

    asked by CHEM HELP ASAP on May 13, 2014
  76. IPC

    Ampere showed that parallel wires carrying current in opposite directions would ____ each other. a)attract b)repel i think its repel.. but not sure. help me understand please! thanks

    asked by help me... on May 12, 2011
  77. physics

    2.4 ampere current is flowing in a wire .how many electrons pass a given point in the wire in one second if the charge on an electron is 1.6x10 power -19 couloms.

    asked by komal yaseen on December 31, 2014
  78. Math

    The avearage velocity of the electrons in a conductor carrying a current of 65.5 ampere is 0.0153 inches per second. What is the cross sectional area of the conductor?

    asked by Anonymous on September 17, 2018
  79. Chemistry

    A sodium selective electrode indicates a 34.2 mV response to a 2.50 x 10-4 M Na+ standard solution. Assuming ideal electrode response, what is the sodium concentration of a sample when the electrode indicates a 35.2 mV response?

    asked by RC on August 12, 2013
  80. science

    The potential difference measured across a coil is 20 V when a direct current of 2 A is passed through it. With an alternating current of 2 A at 40 Hz, the p.d. across the coil is 140 V. If the coil is connected to a 230 V, 50 Hz supply, calculate: (a) the

    asked by mpho on July 29, 2015
  81. AP Chemistry

    How long, in seconds, would it take to deposit 10.5 g of copper onto an electrode from a solution of Cu2+ if a current of 2.00 A was applied?

    asked by Jesse on April 13, 2018
  82. Science

    Chargers extend the life of the rechargeable batteries by: A) adding protons to the positive electrode B) adding electrons to the positive electrode C) moving electrons back to the positive electrode D) Moving electrons back to the negative electrode

    asked by Sammy on February 25, 2015
  83. Chemistry

    1) Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+(aq) solution

    asked by CHEM HELP ASAP on May 13, 2014
  84. Magnetic effect

    A positive helium ion He+ is released from rest at the surface of a +1000 V flat electrode. It travels in the +x-direction (in vacuum) across a 1 mm gap, passes through a small hole in a +0 V electrode that is parallel to the first one, and enters a region

    asked by Mac URGENT Please on November 25, 2013
  85. electronics technician

    19. In a solenoid, where is the magnetic field strongest? A. Outside the coil C. At the north pole B. Inside the coil D. At the south pole 20. What is a typical coil voltage for a low-voltage relay circuit? A. 2 VDC C. 12 VDC B. 5 VDC D. 120 VDC 21.

    asked by mompati on June 18, 2013
  86. chemistry

    Suppose a car's motor draws 231 Ampere of current for 6.3 sec to start the car. What mass of Pb is oxidized in the lead-acid battery to supply this much electricity?

    asked by Cristian on December 2, 2012
  87. Chemistry

    Please help!:( What mass of copper would be produced by the reduction of copper(II) ions during pas- sage of 1 ampere of current through a solution of copper(II) sulfate for 89 minutes?

    asked by Steven Gomez on April 21, 2013
  88. Chemistry

    Given the following list from the activity series of metals (from most active to least active) K, Na, Al, Mn, Cr, Cd, Co, Pb, Hg which reaction would you NOT expect to occur? 1. All of the listed reactions will occur. 2. Na(s) +Mn2+(aq) -> Na+(aq) +Mn(s)

    asked by Elva on October 16, 2010
  89. math

    In a group of 105 students, 70 students passed Mathematics, 60 students passed History and 45 students passed Geography; 30 students passed Mathematics and History, 35 students passed History and Geography, 25 passed Mathematics and Geography, and 15

    asked by Lucas on January 23, 2014
  90. Math

    In a group of 105 students, 70 students passed Mathematics, 60 students passed History and 45 students passed Geography; 30 students passed Mathematics and History, 35 students passed History and Geography, 25 passed Mathematics and Geography, and 15

    asked by Lucas on January 24, 2014
  91. Multiple Choice

    Physics 2. Which of the following is equivalent to one ampere? (Points : 1) 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s Question 3.3. A stream of moving charges results in a current of 5.6 A. How long does 116 C of charge take to flow past a fixed point?

    asked by Steven on May 8, 2014
  92. chemistry

    Dr Bob Could you check this please? Voltaic cell---cathode is positive, accepts electrons, reduced, anode is negative, gives up electrons and is oxidized Electrolytic cell------cathode is negative, accepts electrons and is reduced. Anode is positive,

    asked by lulu on April 29, 2016
  93. AP Chemistry

    This questions has 5 parts but I already have the answers for a and b. I need help on the last three parts. In an electrolytic cell, a current of 0.250 ampere is passed through a solution of a chloride of iron producing Fe(s) and Cl2(g). a) write the

    asked by anonymous on April 24, 2007
  94. ap chem

    Bismuth can be electrolytically reduced according to the following reaction: BiO(+)+ 2H(+)+ 3e¯ >>> Bi + H2O How many grams of bismuth can be reduced by applying a 5.60 A current for 23.8 min. to a solution containing BiO+ ions (assuming 100% efficiency)?

    asked by Anonymous on May 22, 2015
  95. physical chemistry PLEASE HELP!!!

    how do i calculate a ratio of oxidised to reduced cytochrome c Fe2+ to Fe3+ given E(mV) at 25 C and pH7 as 100 and absorbance at 550nm as 1.5 E is relative to standard hydrogen electrode i don't know how im supposed to calculate it from this data

    asked by lucy on February 17, 2010
  96. physical chemistry

    how do i calculate a ratio of oxidised to reduced cytochrome c Fe2+ to Fe3+ given E(mV) at 25 C and pH7 as 100 and absorbance at 550nm as 1.5 E is relative to standard hydrogen electrode i don't know how im supposed to calculate it from this data

    asked by lucy on February 17, 2010
  97. i need help finding PH

    Calculate the pH of the cathode compartment for the following reaction given Ecell = 3.01 V when [Cr3+] = 0.15 M, [Al3+] = 0.30 M, and [Cr2O72-] = 0.55 M. 2 Al(s) + Cr2O72-(aq) + 14 H+(aq) → 2 Al3+(aq) + 2 Cr3+(aq) + 7 H2O(l)

    asked by Anonymous on May 20, 2015
  98. is the ph= o for the H+

    Calculate the pH of the cathode compartment for the following reaction given Ecell = 3.01 V when [Cr3+] = 0.15 M, [Al3+] = 0.30 M, and [Cr2O72-] = 0.55 M. 2 Al(s) + Cr2O72-(aq) + 14 H+(aq) → 2 Al3+(aq) + 2 Cr3+(aq) + 7 H2O(l)

    asked by Anonymous on May 21, 2015
  99. college chemistry

    Calculate the pH of the cathode compartment for the following reaction given Ecell = 3.01 V when [Cr3+] = 0.15 M, [Al3+] = 0.30 M, and [Cr2O72-] = 0.55 M. 2 Al(s) + Cr2O72-(aq) + 14 H+(aq) → 2 Al3+(aq) + 2 Cr3+(aq) + 7 H2O(l)

    asked by Anonymous on May 20, 2015
  100. chemistry

    A galvanic cell with e o cell = 0.30 v can be constructed using an iron electrode in a 1.0 m fe(no3)2 solution, and either a tin electrode in a 1.0 m sn(no3)2 solution, or a chromium electrode in a 1.0 m cr(no3)3 solution even though sn2+/sn and cr3+/cr

    asked by wallace on August 12, 2018