1. chemistry

    Calculate the pH for the hydrogen half-cell of the following voltaic cell if the observed cell voltage is 1.00 V. Mn|Mn2+(1.00 M)||H+(pH =?), H2(1.00 atm)|Pt

    asked by mary on March 15, 2014
  2. Biology

    The average human cell that is capable of dividing has a cell cycle of 20 hour. How many cells would there be in one week if they start with one cell at time zero?

    asked by Maria on November 14, 2007
  3. ap chemistry

    a cell is based on the following reaction Fe(s)+2Fe+3(aq) -----> 3Fe+2 (aq) E cell= 1.18 V. Calculate the concentration of iron (II), in M, if the cell emf is 1.28 V. when [Fe^(3+)]= 0.5 M the answer is 0.047 M

    asked by Anonymous on May 26, 2015
  4. Statistics

    Sickle cell disease is an inherited blood disorder that affects red blood cells. Since it is a recessive disorder, a person inheriting two sickle cell genes will have the disease, whereas a person inheriting only one sickle cell gene will be healthy, but

    asked by Mark on November 27, 2017
  5. so

    Which junction corresponds to sub cell 3? Sub cell based on Ge. Sub cell based on GaAs. Sub cell based on GaInP. Sub cell based on GaInAs.

    asked by pritam on January 29, 2017
  6. Sta

    It is pretty common across most schools to find the grades at the MBA level divided between A’s and B’s. As such, you expect the mean GPA to be around 3.50. Using the sample of 200 MBA students, conduct a one-sample hypothesis test to determine if the

    asked by Mark on March 17, 2012
  7. phys

    1. A vector has (at minimum) how many parts associated with it? 2. When adding three vectors graphically one needs to: a. Spin each one like a spinner on a board game. b. Do nothing because more than two vectors cannot be added graphically c. draw all the

    asked by Jawad on August 29, 2005
  8. Biology

    What type of cell would you expect to have more mitochondria, a skin cell, or a cardiac muscle cell? Explain why. Thank you all!

    asked by Biolover! on March 7, 2008
  9. physics

    The magnitude of the scalar product of vectors A and B is three times as large as the magnitude of the vector product of the same two vectors. If they were placed tail-to-tail in space, A and B would form an angle of approximately how much?

    asked by Edith on December 8, 2010
  10. 6th Grade Science

    What are: -Groups of similar cells doing the same work? -Organs working together? -A long branched type of cell that sends messages quickly? -Cell surrounded by calcium and phosphorous? -Cells in many celled organisms are ______? -The smallest living unit

    asked by Brandi on March 29, 2009
  11. Math Help Please

    The concentric circles, or growth rings, represent the cross-section of a tree with a diameter of 16 centimeters. The width of the outer tree ring measures 2 centimeters. What is the area in square centimeters of the outer ring of the cross-section of the

    asked by Andrew on February 23, 2007
  12. Chem

    Given E° (Al3+|Al) = -1.66V and E° (Ag+|Ag) = .80V, calculate the overall cell potential when the two half-cells are connected. My answer: E°cell = E°(cathode) - E°(anode) E°cell = .80 + 1.66 = 2.46 Is this correct? That's right.

    asked by Marisol on March 23, 2007
  13. science

    howwould u define these words cell, organelle, cell theory, cell wall , cel membrain, nucleus, organ/system tissue.

    asked by angie on May 18, 2010
  14. biology

    One of the way that a virus can avoid being detected by the immune system is to egress from the host cell by: a. lysis b. Excocytosis c. Direct cell cell spread d. budding

    asked by biology on September 15, 2009
  15. statistic

    A survey of drivers in the United States found that 15% never use a cell phone while driving. Suppose that drivers arrive at random at an auto inspection station. a. If the inspector checks 10 drivers, what is the probability that at least one driver never

    asked by sasha on January 6, 2013
  16. stastics

    A survey of drivers in the United States found that 15% never use a cell phone while driving. Suppose that drivers arrive at random at an auto inspection station. a. If the inspector checks 10 drivers, what is the probability that at least one driver never

    asked by level crawford on May 3, 2011
  17. maths

    A metal pipe is 63cm long. Inner diameter of a cross section is 6m and the outer diameter is 8cm find:-surface area of the base a , surface area of the base b , the outer curved surface area inner curved surface area total surface area

    asked by chaithu on November 8, 2012
  18. math

    Paulo earns a salary of 15000$ per month for selling cell phones. He receives an extra 30$ for each cell phone over 100 units that he sells. How much will be make if he sells R cell phones? 50 cell phones?

    asked by Jacob on November 2, 2017
  19. CHEMISTRY

    E cell= E naught cell- (0.02570 V/n) lnQ where Q=1/([H+]^4[SO42-]) calculate E cell at 25 c if [H2SO4]=10.0M help?

    asked by Nia ! Dr.Bob!! please help me!! on March 9, 2012
  20. please answer simple stat any tutor

    mu1 - mu2 >0 is a two tail test or right tail test??

    asked by Anonymous on May 23, 2013
  21. math

    divide 95m long string such that twice of 1st part, 4 times of 2nd part and 5 times of 3rd part are equals

    asked by Ghulam on September 7, 2016
  22. chemistry

    An elctrochemical cell is made up of Zn&Co with their standard reduction potential -0.76V,-0.28V respectively. 1. Select the anode&cathode? 2. Write down the cell reactions? 3. Compute the e.m.f of the cell?

    asked by Anonymous on January 19, 2013
  23. physical

    Part A Each blade on a wind turbine is engineered to produce an effective force through its center of mass that is perpendicular to its long axis. (Part A figure) The magnitude of the force produced by each blade in a wind of speed v is F=(40.0~{\rm

    asked by gary on April 6, 2011
  24. Chemistry

    A galvanic cell consists of La^3+/La half-cell and a standard hydrogen electrode. If the La^3+/La half cell functions as the anode and the cell potential is 2.52 V, what is the reduction potential for the La^3+/La half cell? the choices are -2.52V,-0.84V,

    asked by Anonymous on March 9, 2010
  25. Microeconomics

    For this part of the assignment, we will focus on the demand curve. Draw the demand curve for the A-Phone. Explain how the graph, price, and quantity demanded will change if the following occurs: • There is an overall increase in income. • It is

    asked by sharon on October 14, 2012
  26. Physics

    The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.70 m and 0.99 m, respectively. The respective rotational speeds are 454 rev/min and 4,147 rev/min. Calculate the speeds of the tips of both rotors. main rotor

    asked by Allie on October 10, 2011
  27. physics

    You shoot an arrow into the air. Two seconds later (2.00 s) the arrow has gone straight upward to a height of 30.0 m above its launch point part A:What was the arrow's initial speed?part B:How long did it take for the arrow to first reach a height of 15.0

    asked by ana22 on February 11, 2017
  28. Elements of Psychology

    I need help on these questions. My answers have the < by them 1. In a typical neuron, sheaths of fatty tissue called _______ surround the axon. A. terminals C. synapse B. dendrites D. myelin

    asked by Natasha on September 16, 2010
  29. college physics

    Suppose an aeroplane is moving in the north direction and magnetic field is into the paper .Which part of aeroplane will b positively charged? A-its head B-its left wing C-its tail D- its right wing

    asked by Ghulam on July 20, 2016
  30. plzz HELP me

    If it is Ms.Sue or WRITEACHER do not bother because i know you do not help if your going to help than help but if not than don't but i don't want to hear complaining about not helping now anyone please help _______ , seen here in Figure 10-2, has ladder

    asked by peace on January 3, 2013
  31. Chemistry

    Consider the voltaic cell illustrated in the figure, which is based on the cell reaction: Zn(s)+Cu^2+(aq) -> Zn^2+(aq)+Cu(s) Under standard conditions, what is the maximum electrical work, in joules, that the cell can accomplish if 52.0g of copper is

    asked by Steven on April 16, 2012
  32. biology

    imagine if you are a water molecule outside of an animal cell of a human.the person just drunk the glass.write a persuasive letter to the cell membrane convincing it to let you inside the cell.

    asked by dashia on January 28, 2010
  33. chemistry

    A voltaic cell can be built using the reaction between Al metal and O2 from the air. If the Al anode of this cell consists of 65 g of aluminum, how many hours can the cell produce 1.5 A of electricity, assuming an unlimited supply of O2?

    asked by maddie on October 19, 2015
  34. science

    The small structures in the cell that carry out the cell's activities are known as?   The ____ can be described as the basic unit of life The jelly-like substance that fills the cell is called Mitochondria are responsible for

    asked by Delisha on March 25, 2017
  35. Chemistry

    Consider the voltaic cell illustrated in the figure, which is based on the cell reaction: Zn(s)+Cu^2+(aq) -> Zn^2+(aq)+Cu(s) Under standard conditions, what is the maximum electrical work, in joules, that the cell can accomplish if 52.0g of copper is

    asked by Steven on April 17, 2012
  36. chemistry

    - What fraction of an E coli cell is occupied by its DNA? How would I find the fraction? If I knew the volume of an E coli cell, would I divide that by the volume of DNA in an E coli cell? - A human cell is typically spherical with a diameter of 20

    asked by Janae on September 8, 2009
  37. algebra 1

    A piece of lumber which is 55 inches long is cut into two parts such that 2 times the larger part will be 12 more than 5 times the smaller part. How long are each of the pieces of lumber?

    asked by carole on November 22, 2011
  38. physical science

    the headlamp and 2 identical tail lamp are conected in paralel to batery with unknown internal resistancs.headlamp resistance wth 2.4 ohm controld by switch s1.the tail lamps are controled by s2.the resistance of the connection wired may be ignored.

    asked by queen on January 16, 2012
  39. biology

    What part of the cell controls our heredity?

    asked by Haley on June 12, 2008
  40. Science

    The part of a cell that protects it from its environment is the...?

    asked by Ashley on May 24, 2011
  41. biology

    In what part of the cell does translation occur?

    asked by Miguel on April 24, 2014
  42. biology

    what part of eukaryotic cell is least important?

    asked by Tracy on May 23, 2010
  43. Science

    Can someone please help direct me to a start for this?? 1. Explain why the outer planets did not lose the lighter gases in their atmosphere. 2. What are two major differences in the composition of the inner and outer planets?

    asked by Reeses on April 18, 2017
  44. ALGEBRA

    An alligators tail length,T varies directly from its body length B. So an alligator with a body length of 7.7 feet has a tail length of 6.3 feet. What is the tail length of an alligator whose body length is 4.4 feet? Thanks ahead of time.

    asked by TOTALLY lost on March 11, 2012
  45. Algebra

    An alligators tail length, T varies directly as its body length, B. An alligator with a body length of 5.4 feet has a tail length of 4.8 feet. what is the tail length of an alligator whose body length is 4.5 feet? In desperate need of solving this!

    asked by Kate C. on July 29, 2011
  46. maths

    the outer edge of a circular track is 440 m long.if is widened by 5m all around,find the cost of widening it at rate of 8 rs per m square?

    asked by prashita on February 15, 2012
  47. Physics

    A ventilation fan has blades 0.25 m long rotating at 20 rpm. What is the centripetal acceleration of a point on the outer tip of a blade?

    asked by Ashley on June 9, 2010
  48. chem

    Explain, in terms of electrical energy, how the operation of a voltaic cell differs from the operation of an electrolytic cell used in the Hall process. Include both the voltaic cell and the electrolytic cell in your answer. Would this be correct: In a

    asked by Anonymous on April 21, 2009
  49. Physiscs 222

    The inner and outer surfaces of a cell membrane carry a negative and positive charge respectively. Because of these charges, a potential difference of about 70*10-3 V exists across the membrane. The thickness of the membrane is 8.0*10-9 m. Assumption the

    asked by Nathan on June 15, 2015
  50. math

    The chance of a head occurring in a certain biased coin is twice that of the tail occurring if the coin tossed 5 times. What is the probability of at most 1 tail occuring in the 5 tossed?

    asked by Ability E. on June 13, 2016
  51. Psychology -- anyone

    Please read the entire thing. My Assignment: Describe neurotransmitters, their function, and impact on behavior. Discuss one neurotransmitter in detail describing the effect it has on our bodies and connection with disease. Discuss the importance of

    asked by Anonymous on July 19, 2006
  52. biology

    Looking through a microscope,I saw a Eukaryotic cell. How could I conclude if the cell is a plant or animal cell?

    asked by aisha on January 6, 2016
  53. English

    I took too long in the shower. (Is this grammatical? What is the part of speech of 'long'? Is 'long' a noun?)

    asked by rfvv on March 14, 2012
  54. English

    I took too long in the shower. (Is this grammatical? What is the part of speech of 'long'? Is 'long' a noun?)

    asked by rfvv on March 14, 2012
  55. Chemistry

    One half-cell in a voltaic cell is constructed from a silver wire electrode in a .25 M solution of AgNO3 . The other half-cell consists of a zinc electrode in a .001 M solution of Zn(NO3)2. Calculate the cell potential I have no idea and am so stressed,

    asked by Anonymous on November 18, 2015
  56. science

    which path does light take upon entering your eye? a). cornea-pupil-iris-retina-lens-optic nerve-brain b). pupil-cornea-iris-lens-retina-optic nerve-brain c). cornea-pupil-lens-retina-optic nerve-brain

    asked by aya corneto on June 30, 2016
  57. Grammar

    What is the case and syntax of trhe word feet in the sentence "The center of a tennis net is three feet long." In this sentence, "feet" is an adjective modifying the noun "long." feet is part of a dimensional adjective "three feet long". Feet modifies

    asked by Elizabeth on August 10, 2007
  58. Electric Field between concentric cylinders

    I wanted the electric field between concentric cylinders, and got anexpression using Gauss' Law that considers only charge enclosed. Thus, there was no influence due to the outer cylinder. But, if we consider the limiting case of the inner cylinder having

    asked by Samantha Green on May 23, 2008
  59. Biology...

    1. References are made by the anatomist to the front,back,head and tail of the body. What anatomical reference terms are used to describe each of these directions? My answer: anterior, posterior, I am not sure with head and tail Is it superior and

    asked by Anonymous on February 4, 2013
  60. Literature

    This is my free verse poem about a cat stuck in a vending machine. Is it alright? Inside I lay of a crowded box Hungry for 3 straight days The ironic part being that I was in a vending machine. The fear made me shiver til’ my insides quivered Would I

    asked by mysterychicken on December 1, 2009
  61. Chemistry

    Provide the balanced reaction, the value of K, and E(cell) at equilibrium for the for the electrochemical cell created from the two half-cell reactions below Cr^(3+) + e ==> Cr^(2+) Fe^(2+) + 2e ==> Fe Well, I got the balanced reaction: 2Cr^(2+) + Fe^(2+)

    asked by Nora on March 18, 2015
  62. Univ Physics-resistance

    A hollow cylindrical resistor with inner radius r1 and outer radius r2, and length l, is made of a material whose resistivity is rho. A.Find the resistance for current that flows radially outward. Divide the resistor into concentric cylindrical shells and

    asked by Joanna on February 9, 2010
  63. Math

    A cell phone company charges a monthly fee of $17.95 and $0.03 per minute Write an equation that represents the cost (c) for using the cell phone for minutes (m) Use your equation from part a to find the cost for using the phone for 150 minutes

    asked by Gina on April 28, 2014
  64. science

    which part of a plant cell is made of cellulose

    asked by James on August 3, 2017
  65. math

    I have a math question for my cell biology class. A molecule exchanges places with its neighbor every 10^-7 seconds. It will diffuse from one end of a 2 micrometer cell to the other in 1second. Ok now I have a 6M x 6M room filled with 4cm ping pong balls.

    asked by Amy on September 9, 2012
  66. physics HELP

    Consider a coaxial cable with 2Amps in the center conductor coming out of the page, and 1Amp in the outer conductor going into the page. The center conductor has a radius of 1mm, the outer conductor's inner radius is 2mm, and the outer conductor's outter

    asked by dalton on April 7, 2014
  67. physics

    Consider a coaxial cable with 2Amps in the center conductor coming out of the page, and 1Amp in the outer conductor going into the page. The center conductor has a radius of 1mm, the outer conductor's inner radius is 2mm, and the outer conductor's outter

    asked by roger on April 6, 2014
  68. physics

    Consider a coaxial cable with 2Amps in the center conductor coming out of the page, and 1Amp in the outer conductor going into the page. The center conductor has a radius of 1mm, the outer conductor's inner radius is 2mm, and the outer conductor's outter

    asked by Anonymous on April 7, 2014
  69. physics

    Consider a coaxial cable with 2Amps in the center conductor coming out of the page, and 1Amp in the outer conductor going into the page. The center conductor has a radius of 1mm, the outer conductor's inner radius is 2mm, and the outer conductor's outter

    asked by mike on April 7, 2014
  70. Science

    Can you recommend a good site that explains why we use filters to observe the Sun in different wavelengths,and why the outer part of the Sun (Corona)is hotter than the inner parts.

    asked by nichola on June 23, 2009
  71. Biology :)

    Consider the following situation. A cell is in a solution that contains dissolved oxygen. As the cell uses oxygen for respiration, a. oxygen will be carried across the cell membrane by special transport molecules. b. oxygen will naturally diffuse out of

    asked by Anonymous on December 31, 2015
  72. English

    1. The cell phone vibrates when somebody calls me. 2. The cell phone vibrates when someone calls me at the phone. 3. The cell phone vibrates when a text message comes/arrives. 4. The cell phone vibrates when a text message is sent to the phone. 5. The cell

    asked by rfvv on October 18, 2017
  73. college mathematics

    8. Determine which, if any, of the three statements are equivalent. Give a reason for your conclusion. Show complete work. I.) If the dog wags its tail, then the dog is not calm. II.) Either the dog does not wag its tail or the dog is not calm. III.) If

    asked by cody on February 7, 2012
  74. Algebra. NEED HELP ASAP PLEASE

    After 2009 the sales of new cell phones without cameras began declining. The number of people y (in thousands) who bought a cell phone without a camera can be estimated by the equation y=−30x+270 y=-30x+270, where x is the number of years after 2009. a)

    asked by Duran on April 19, 2016
  75. biology

    Sketch a mold cell and label the key parts. Include all of the following:  Ribosomes  Mitochondrion  Endoplasmic reticulum  Nucleus  Cell wall  Cell membrane  Golgi apparatus  Vacuole  Centriole

    asked by Diamondchic on January 9, 2017
  76. biology

    Can someone explain to me how a plasma/cell membrane carry put the following functions? i've searched the net and can't seem to find anything on them * Compartmentalization of the cell into organelles * Organization of biochemical pathways –Attain

    asked by kimora on November 25, 2008
  77. Physics

    A spring is 16.2 cm long when it is lying on a table. One end is then attached to a hook and the other end is pulled by a force that increases to 28.0 N , causing the spring to stretch to a length of 19.0 cm . Part A What is the force constant of this

    asked by Jess on November 24, 2017
  78. statistics

    drug company promises to help people lose at least 3 pounds per week. 15 people use the drug. they lose an average of 2.8 lbs per week with a standard deviation of .5lbs. is this a left tail or right tail and why?

    asked by Anonymous on June 12, 2012
  79. science

    explain an animal cell in your own words and two things each part does

    asked by ash on January 18, 2015
  80. Statistics

    12. The proportion of students who own a cell phone on college campuses across the country has increased tremendously over the past few years. It is estimated that approximately 94% of students now own a cell phone. Twenty five students are to be selected

    asked by Rodney on April 19, 2012
  81. Math

    Two guy wires are attached to a cell tower. The first one is 15 ft long and at an angle of elevation on the ground of 55 degrees. The second wire is 22 ft long an angle of elevation on the ground of 63 degrees. Both wires secured same location on ground.

    asked by Brenda on January 16, 2017
  82. genetic information

    I am doing a small (paragraph) section on the requirements of genetic information and I probably will put some of this in. It can be over anything. Is the below all correct? It must be an information carrier. It must be resistant to change. It must be able

    asked by Susette Stubbs on October 5, 2006
  83. trig/math

    3. Draw vectors u and v tail-to-tail so that they make a è-degree angle. Draw the vector u − v, the third side of the triangle, and check to see that it points in the right direction. (a) Solve for cos è using the SSS version of the Law of Cosines,

    asked by sarah on April 18, 2010
  84. science

    A student observes a cell with many mitochondria. This cell is most likely what type of cell?

    asked by Anonymous on February 27, 2012
  85. physics- please help

    A 65 kg bungee jumper leaps from a bridge. She is tied to a bungee cord that is 11m long when unstretched, and falls a total of 30m . Part a) Calculate the spring constant of the bungee cord assuming Hooke's law applies. part b)Calculate the maximum

    asked by emmie on May 24, 2012
  86. biology

    Which is a form of active transport? A. Proteins open up channels in the cell membrane. B. Proteins push molecules through the cell membrane. C. Proteins create openings on another side of the cell membrane. D. Proteins enter and exit the cell freely. i

    asked by Lilly on October 24, 2017
  87. Data Analysis Help

    Arithmetic operations, cell references, and __________ can be used in Excel formulas. constants macros programs procedures is it A 2Using the mouse to select a specific cell is when creating a formula is called: sizing. moving. accessing. pointing. is it D

    asked by Bryan on July 20, 2009
  88. Chemistry

    Why is magnesium atom smaller than atoms of both sodium and calcium? The location of the outer electrons for Mg are in closer to the nucleus than of Sodium or Calcium. To add to the correct answer from Bob Pursley, consider the electronic configurations.

    asked by Bryan on November 9, 2006
  89. @damon

    I am still getting the wrong answrs, can you please do me a favor and for each part list the formulas and steps i need to do in order to get the answer. thank you At serve, a tennis player aims to hit the ball horizontally. part a)What minimum speed is

    asked by Clarissa on April 22, 2012
  90. English

    1. The cell phone vibrates. 2. The specific cell phone (I showed you before) vibrates. 3. Any cell phone vibrates. 4. The cell phone is vibrating. [Does #1 mean #2 or #3? In #4, the specific phone is vibrating. So, no problem. However, all cell phones do

    asked by rfvv on October 18, 2017
  91. Gen Chem

    A current is passed through two cells connected in series. The half-reactions occurring at the cathode of each cell are TcO4-(aq) + 8 H+(aq) + 7 e- ===> Tc(s) + 4 H2O(l) and Cu2+(aq) + 2 e- ===> Cu(s). If 4.40 g of copper are deposited in the second cell,

    asked by Sarah H on March 28, 2008
  92. biology

    1. From one molecule of glucose, which process generates the largest amount of ATP? a. Glycolysis in a prokaryotic cell under aerobic conditions b. Glycolysis in a eukaryotic cell c. the TCA (Krebs) cycle in a prokaryotic cell d. the TCA (Krebs) cycle in a

    asked by sarah on April 6, 2009
  93. Science Fair

    Hi, my question is are part 1,2, and 3 different ways you can do the project? There are three parts. Each part should take less than 1 hour. In Part 1, you will stare at a colored object for various amounts of time, then measure how long it takes for the

    asked by Unknown on October 23, 2012
  94. Statistics

    Q1:(a) Make a relative frequency table of the data. Enter your answers to three decimal places. Cell Phone Owned Relative Frequency Android smartphone iPhone smartphone Blackberry smartphone Cell phone not smartphone No cell phone Total (b) Round your

    asked by Robert on March 13, 2017
  95. Physics

    A solenoid has N=1760.0 turns, length d=40 cm , and radius b=0.4 cm, (bL/R) after S1 is closed? . (d) How much energy (in J) is stored in the magnetic field of the coil a very long time (t>>L/R) after S1 is closed? For the next part, assume that a very

    asked by Anonymous on May 23, 2013
  96. Electrochemistry

    In lab, we did an experiment with electrochemical cells with solutions of ZnSO4, CuSO4, Al2(SO4)3 and MgSO4 and their respective metal electrodes. There are a couple of post-lab questions that I'm not sure about: (1) Summarize Part A with a data table

    asked by Donna on May 16, 2008
  97. Statistics

    suppose you flip a fair coin five times. which of these pairs of events are disjoint? (a). you get five heads;you get four heads and a tail (b). the first flip is a head;the second flip is a head (c). you get five heads; the second flip is a tail (d). you

    asked by fayth on May 14, 2011
  98. Science-The Solar System

    What are two major differences in the composition of the inner and outer planets? I know that the inner planets are small, hard, and rocky, and the outer planets are large and gaseous. What is another difference?

    asked by Person on March 16, 2016
  99. Biology

    WHAT CELL PART AIDS IN MOVEMENT AND INCREASES THE SURFACE AREA?

    asked by Ashley on October 24, 2012
  100. biology

    How does a researcher synchronize cells to make sure that they are all in the same part of the cell cycle.

    asked by Anonymous on November 18, 2008