1. chemistry

    The number of protons in an anion must always be ________ the number of electrons. the same as We can’t tell. less than greater than

    asked by Rachel on December 6, 2014
  2. please ..chem

    When you touch an object, does the electrons from your hand exchange photons with the object?

    asked by Anonymous on February 24, 2014
  3. chemistry

    in an element on the periodic table, which number tells you the how many electrons are in that element??

    asked by Jane on November 4, 2010
  4. Physics

    I'm doing a project concerning space travel to Mars, and I need some help with calculations. This is the description of the assignment: After completing Assignment 1 we realized that our small spacecraft needs to travel at over 7 km/s to keep orbiting

    asked by Nikki on May 8, 2010
  5. mechanics

    please help solve these questions (1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of

    asked by incredible on January 1, 2016
  6. eth

    how do you think slavery influenced the evolution of both black and white america today? is there any websites that might help me with this question? As I was starting to answer your question, I had a conversation with BobPursley. He has summed this answer

    asked by jenny on September 12, 2006
  7. Physics (please check)

    A 6.0kg block is released from rest 80m above the ground. When it has fallen 60m its kinetic energy is: I got 1200J as my answer mgh=(6.0*9.81* 60m)=3531.6 PE + KE= (ME + KE) 3531.6 + KE= (6.0*9.81*80m) KE= 1177.2 is that right A 6.0 Kg block is thrown up

    asked by susane on November 5, 2006
  8. Physics

    a particle (C) of mass m = 0.2 kg can slide without friction on an inclined plane making an angle alfa (a) = 30 degrees with respect to the horizontal (aka ground) . (C) is launched at at an instant to=0 along a line Ox of greatest slope with an initial

    asked by PlzhelptheyllkillmeifIgetthiswrong on September 24, 2011
  9. calculus

    One bicycle is east of an intersection , and it is travelling towards the intersection of 9 miles per hour. at the same time a second bicycle is south of the intersection , and it is travelling away from the intersection at the rate of 10 miles per hour.

    asked by uGinn on July 26, 2017
  10. 5th grade

    The gravitational force on the moon is one -sixth of what it is on Earth. This means that on the Moon you would weigh one-sixth of what you weigh on Earth. How much would you weigh on the moon.

    asked by NayQuan on September 1, 2010
  11. statistics

    El Nino and the mosoon. The earth is interconnected. For example, it appears that El Nino, the periodic warming of the Pacific Ocean west of South America, affects that the monsoon rains that are essential for agriculture in India. Here are the monsoon

    asked by Anil on January 14, 2013
  12. Physics

    An electron in a television CRT moves toward the front of the tube with a speed of 7.5x10^6 m/s. A magnetic field of 0.04T (on a 50 degrees angle) causes the electrons to accelerate. Determine the acceleration

    asked by HELP on May 11, 2013
  13. Chemistry

    In a closed container 1L of chlorine reacts with 1L of nitrogen and 1L of hydrogen. I need to give lewis structure, vsepr, box notation for valence electrons etc. (i know how to do this) But I'm doubting on what the reaction equation would be.

    asked by Nicolas on January 15, 2016
  14. chemistry

    how many protons and nuetrons are contained in the nucleus of each of the following atoms? assuming each atom is uncharged, how many electrons are present? a. 235/92U b. 13/6C c. 57/26Fe d. 208/82Pb e. 86/37Rb f. 41/20Ca

    asked by Corey on September 20, 2009
  15. physics

    As part of a sinister plot, I connect a piece of high-purity GaAs 1 cm long to a 9 V battery, at room temperature. What is the resulting drift velocity of the electrons? Your answer should be in cm/s

    asked by Henry III on December 21, 2013
  16. physics

    1. what happens to the field strength when you halve the distance between two charges? 2. A positive charge of 3.5 uC is located in an electric field of intensity 3.00 N/C directed toward the south. Find the magnitude and the direction of the force on the

    asked by carol on May 29, 2012
  17. math

    I have a math problem. A Mars year is 1.88 Earth years. If you are 13 years old in Earth years, about how would you be in Mars in Mars years? Thanks

    asked by jared on January 26, 2010
  18. Physics

    If the moon were twice as massive, would the attractive force of Earth on the moon be twice as large? Yes No What about the attractive force of the moon on Earth? Yes No

    asked by Sharvani on October 25, 2012
  19. Algebra 1 Scientific Notation

    Isaac newtons theory of universal gravitation states that the equation F=G m^1m^2/r^2 can be used to calculate the amount of gravitational forces in newtons between 2 point masses (m^1) and (m^2) separated by a distance (r). G is a constant equal to

    asked by Austin on September 26, 2011
  20. Physics

    In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the

    asked by Anonymous on April 16, 2013
  21. Physics

    In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the

    asked by Don on April 8, 2013
  22. calculus

    newtons law of gravitation says that the magnitude F of the force exerted by a body of mass m on a bod of mass M is F=GmM/r^2 where G is the gravitational constant and r is the distance between the bodies. a)find dF/dr and explain its meaning. What does te

    asked by cassie on October 11, 2007
  23. Ap physics 1

    The mass of a star in a galaxy far, far away, is 3.12 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 2.46 × 108 km. Treating this planet and star as particles,with each

    asked by Jonathan on December 11, 2015
  24. Physics

    The mass of a star in a galaxy far, far away, is 2.13 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 7.87 × 108 km. Treating this planet and star as particles, with each

    asked by Briana on January 17, 2016
  25. Environmental Science

    29. A common feature of thermal pollution and artificial eutrophication is that they both a. have sources that are difficult to identify and control b. cause large mats of algae to bloom in fresh water c. are a result of power plants and other industrial

    asked by y912f on January 27, 2010
  26. Chem

    Hello What is the wavelength (in nm) of the line in the spectrum of the hydrogen atom that arises from the transition of the electron from the orbital with n =5 to the orbital with n = 2? Note, the line corresponds to the energy of the photon that is

    asked by Anonymous on October 26, 2012
  27. science

    I am studying science at GCSE. I a working through a revision book and have come across a question which i am unsure of the answer. The question is, "state the number of different elements present in C6H5CO2Na." The answer i have is 14 but still i am

    asked by sam on March 19, 2007
  28. Physics

    At what distance from a carbon nucleus is the electric potential 1.8 V? Carbon atoms have 6 electrons in the atomic shell ...im very confused with this question, please help!

    asked by Lauren on February 28, 2010
  29. Chemistry

    What is the electron configuration called that has 18 electrons in the outer energy level and all of the orbitals filled? Noble gas configuration

    asked by Bryan on November 16, 2006
  30. Chemistry

    A metal foil has a threshold frequency of 5.45× 1014 Hz. Which of the colors of visible light have enough energy to eject electrons from this metal.

    asked by Jake on October 10, 2013
  31. Physics E&M

    Three electrons form an equilateral triangle 1.00 nm on each side. A proton is at the center of the triangle.What is the potential energy of this group of charges?

    asked by Spencer on February 18, 2008
  32. chemistry

    Please explain this to me 2I- --> I2 + 2e Cr2O72- ==> Cr3+ 6e + 14H + Cr2O72- ==> 2Cr3+ + 7H20 I don't understand how the left side gets 6 electrons.

    asked by Monique on November 20, 2011
  33. Physics

    When two identical ions are separated by a distance of 5.9 multiplied by 10-10 m, the electrostatic force each exerts on the other is 6.0 multiplied by 10-9 N. How many electrons are missing from each ion?

    asked by Alex on June 28, 2012
  34. Science

    A 6.0 volt battery is hooked up to a light bulb, whose resistance is 3.1 ohms. How many electrons would leave the battery per second? (Hint: 1 electron = 1.6E-19 C)

    asked by David on September 28, 2009
  35. physics

    two identical copper spheres are separated by 1m in vacuum. how many electrons would have to be removed from one sphere and added to other sphere so that they attract each other with force of 0.9N

    asked by divy on June 2, 2014
  36. physics

    Problem 22.2 2 *10^13 electrons flow through a transistor in 1.0ms . Part A - What is the current through the transistor? Express your answer using two significant figures. in mA

    asked by Paige on September 25, 2011
  37. chemistry

    what is the binding energy of an electron in a photosensitive metal (in kj/mol) if the minimum frequency of light that can eject electrons from the metal is 6.3 x 20^14 Hz?

    asked by jj on November 7, 2011
  38. Pre-AP Science

    an atom consists of 10 neutrons ,10 electrons,and 9 protons. The atom has gained an electron resulting in a charge of -1. What is its mass number?

    asked by Christina on February 4, 2013
  39. Organic Chemistry

    What is the mechanism of action between between benzoic acid (C6H5COOH) and sodium bicarbonate (NaHCO3)? I need to know where the electrons go in the acid-base reaction.

    asked by BOB on October 11, 2011
  40. physics

    at what distance would repulisve force between two electrons have a magnitude of 2.00 n between two protons ? 2=kq1q2/r^2 r^2 = 9.0 x10^9 x (1.6 x 10^-19)^2 So, what is the R, on my answer from, this is 1.07 x10^-14m, however, I cannot get this, can you

    asked by yan on February 21, 2013
  41. SCIENCE HELP ASAP

    1. in an atom, electrons_____ 2. dot diagrams are used to represent_______ 3. the maximum number of electrons in the second energy level of an atom is________

    asked by schweppes on February 28, 2017
  42. Physics

    In a computer monitor, an electron beam with a current of 4x10^-6 A is directed at the screen. How many electrons are transferred to the monitor in 2 minutes.

    asked by Yvonne on May 11, 2012
  43. Marianne

    Fill in the blank: The electrons follow a ________ path when they are deflected in a magnetic field due to the magnetic force.

    asked by Physics on March 13, 2015
  44. Write the shorthand notation

    Write the shorthand notation and the orbital diagram electron configuration representation for each of the following elements and indicate the orbital(s) which contain valence electrons: (a) N, (b) K, (c) Cu, (d) Al.

    asked by gabyj on August 17, 2010
  45. physics

    Calculate the net charge on a substance consisting of a combination of 8.9 × 10 13 protons and 2.6×10 13 electrons. The elemental charge is 1.6 × 10 −19 C. Answer in units of C

    asked by sara on November 18, 2012
  46. Chemistry

    Examine the redox reaction. As2O3(s) + Cl2(g) + H2O(l) → H3AsO4(aq) + HCl(aq) How many electrons are lost by each As atom during the reaction? A)4 B)3 C)2 D)1

    asked by Spencer on June 22, 2018
  47. science

    i have a work sheet to do it gives me the atomic number and the mass number of elements i have to fill in the missing electrons protons neutrons

    asked by austin on October 4, 2012
  48. physics

    A satellite orbits a planet at a distance of 3.80 108 m. Assume that this distance is between the centers of the planet and the satellite and that the mass of the planet is 3.90 1024 kg. Find the period for the moon's motion around the earth. Express the

    asked by Blake on February 16, 2012
  49. physical science

    A kg ball of lead rests next to a 10 kg rock. which statement below is true:a:the lead ball and rock have the same amount of inertia,b:if the lead ball and the rock fell from the same height in a vacuum, the rock would hit the ground first because it is

    asked by ellen on January 29, 2011
  50. math

    Sam and markus are standing on level ground 100m apart. A large tree is due north of markus and on a bearing of 65degrees from sam. The top of the tree appears at an angle of elevation of 25degrees to sam and 15degrees to markus. Find the height of the

    asked by putri on November 12, 2010
  51. Physics

    At what rate will a pendulum clock run on the Moon, where the acceleration due to gravity is 1.63 m/s2 , if it keeps time accurately on Earth? That is, find the time (in hours) it takes the clock’s hour hand to make one revolution on the Moon. provide

    asked by Ellie on February 4, 2013
  52. Astrophysics

    The Earth formed at a redshift of z∼0.53. That means that when our world was young, the universe was quite a bit smaller than it is today. The nearest galaxies to our own are around 10 kpc (kilo-parsecs) in size, lie at a distance of around 1 Mpc from us

    asked by Anonymous on April 12, 2014
  53. english fixed-3

    here's what i did for number 4. The world is deserting because we are taking water for granted. If people continue to waste water, the earth’s structure will change and it will be the main cause of earthquake and potentially a tsunami. and for number 5.

    asked by ESLstudent on February 27, 2012
  54. social studies

    why did the people of the south feel that they needed slaves

    asked by kyara on November 19, 2009
  55. Science/ geography?

    What is the latitude range for Brazil, South America?

    asked by Mark on April 20, 2011
  56. sociology

    What, if anything, do these reverse migrants lose by returning to the South?

    asked by joe on July 21, 2009
  57. sociology

    What, if anything, do these reverse migrants lose by returning to the South?

    asked by joe on July 21, 2009
  58. Geography

    What's the furthest south in the U.S, or Canada that you can see the northern lights? Thanks

    asked by Maureen on March 14, 2009
  59. sociology

    What, if anything, do these reverse migrants lose by returning to the South?

    asked by tiffany on July 21, 2009
  60. life orientation

    5 demographic structures of south Africa and their roles

    asked by mpho on February 13, 2017
  61. U,S History

    What would George Wallace do if he were alive during Reconstruction of the South?

    asked by Alex on September 20, 2009
  62. ss

    What impact do monsoon winds most have on south asia

    asked by Syd on May 13, 2015
  63. Science

    Why do most plants flower later in Scotland than they do in the south of England?

    asked by Anonymous on September 13, 2007
  64. Geography

    About how far is southern tip of South America from the Equator?

    asked by Gianna on September 2, 2015
  65. DESIGN TECHNOLOGY

    THINGS ABOUTH SOUTH AMERICA AND BRAZIL

    asked by FAITH on January 16, 2008
  66. history

    Which of the following describes changes to the industry in South Carolina during the 1800s?  (

    asked by Anonymous on January 26, 2015
  67. social studies

    Into what ocean do most of South America's rivers flow?

    asked by kayla on November 1, 2010
  68. History

    why was the south in favor of the mexican american war ?

    asked by LuLu on April 19, 2008
  69. Social Studies

    What was the impact the civil war had on South Carolina?

    asked by PLZZ HELP on May 18, 2018
  70. business

    Give an example of a monopoly found in South Africa

    asked by Faith on October 27, 2010
  71. Questions

    can someone give me some facts about the environment in south america !?!?!?!?!?!

    asked by matt on May 1, 2014
  72. social studies

    why did john kennedy become unpopular in south carolina

    asked by ciara on May 27, 2015
  73. economics

    the south african governmrnt is not providing enough welfare

    asked by sinazo on May 18, 2014
  74. Science

    Hurry!!!!!!!!!!!!!!!!!!!!!!!!!!!! Which of the following is a speed, not a velocity? A. 35 m/s east B. –35 m/s C. 35 m/s D. 35 m/s south

    asked by Layla on December 4, 2012
  75. History

    Who financed the Middle, the South and the New England colonies?

    asked by Lea on October 14, 2013
  76. Sociology

    What if anything do these reverse migrants lose by returning to the south?

    asked by Paula on August 4, 2009
  77. questions

    Grammar, spelling, and facts can someone tell me about that in south america????

    asked by matt on May 1, 2014
  78. SC state history

    what inspired most of south carolina's internal improvements?

    asked by unknown on November 29, 2016
  79. history 2

    what are some events that led to the collapse of reconstruction in the south?

    asked by jju on September 28, 2007
  80. geography

    what river flows south Cincinnati ohio

    asked by emily on April 17, 2017
  81. history

    How did the south feel about the civil war reconstruction?

    asked by cierra on November 10, 2010
  82. georgraphy

    which ocean would you cross to get from africa to south america

    asked by tyler on September 8, 2008
  83. geography

    The Island of Crete lies SOUTH of which Sea?

    asked by connxus kid on November 7, 2017
  84. World history

    1. Which of the following statements about Southern South America is true?

    asked by Anonymous on June 10, 2013
  85. world geogrophy

    What river flows just south of cincinnati,Ohio?

    asked by Zoey on September 22, 2008
  86. life sciences business studies geography maths lit

    Why pick n pay is established in South Africa?

    asked by Bokamoso Lebeloane on June 3, 2017
  87. english

    Essy topic why i like living in south africa

    asked by Itumeleng on February 6, 2013
  88. math

    Shopping centers X, Y and Z are such that Y is 12 km south of X and Z is 15 km from X. Z is on a bearing of 330° from Y.

    asked by kud on April 14, 2018
  89. us history

    Who explored enough of South America to deem it a new continent?

    asked by april on April 1, 2015
  90. Social Study'S

    How did the demand for cotton help shape the economy for the south?

    asked by Bongladite on January 28, 2016
  91. life orientation

    why do south africa still in corruption cases and how can that be stopped?

    asked by Lati on May 15, 2016
  92. world Geo

    Name the South American country with the capital La Paz.

    asked by Carly on October 15, 2008
  93. Geography

    Can you suggest some legends stories for South Sumatra?

    asked by Trisha on November 25, 2010
  94. Social Studies

    terrorism and the U.S War on Terror in South Aiaa

    asked by phu on April 29, 2009
  95. Geography

    What are two South American countries with no known oil reservers?

    asked by elizabeth on November 15, 2006
  96. social studies

    Name two states that extend futher south than louisiana

    asked by Alex on September 2, 2010
  97. economics

    exchage rate in south africa within 3 weeks

    asked by lesego on May 16, 2013
  98. Social Studies

    What's south asia art,architecture,and culture?

    asked by phu on April 29, 2009
  99. creative arts

    south African monologue for teenage girls

    asked by bongiwe gamede on April 21, 2015
  100. math

    Shopping centers X, Y and Z are such that Y is 12 km south of X and Z is 15 km from X. Z is on a bearing of 330° from Y.

    asked by kudu on February 11, 2015