1. Chemistry

    How many electrons will each element gain in forming an ion? a. Nitrogen ______ b. Oxygen ________ c. Sulfur _______ d. bromine _______
  2. Chemistry

    A potassium metal has a work function F = 4.41 x 10-19 J. Calculate the velocity of electrons emitted by exposing the metal to radiation of wavelength 300 nm.
  3. Physics

    Calculate the net charge on a substance con- sisting of a combination of 3.5 × 1013 protons and 6.3 × 1013 electrons. Answer in units of C.
  4. science

    6.023*x10^21 electrons are present n a given amount of ammonium (NH3).How much amount of hydrogen is required to produce the sample of ammonia
  5. Chem

    Which defines what element the atom is? a. protons b. neutrons or d. electrons. I think it might be neutrons, but can you verify this? AND Would the property "reacts in water" be physical or chemical? Thanks.
  6. Physics

    Electrons are accelerated to reach a kinetic energy of 250 eV (= 4.0 x 10-17 J). If the acceleration is done in a distance of 0.20 m, what is the magnitude of the electric field causing the acceleration?
  7. Chemistry-Explanation Please

    How many valence electrons are in the following? (Remember to add an electron for each negative charge or to subtract one for each positive charge). ICl2− ONF CH4
  8. Chemistry (Check)

    Completion is these correct. I can't figure out 5,7,8,9.. 1)equally 2)Non-polar 3)un equally 4)polar bond 5) 6)clipore interactions 7) 8) 9) When atoms are joined by a covalent bond, the bonding electrons are shared ___1____, and the bond is ___2___. When
  9. abac

    The speed of an object and the direction in which it moves constitute a vector quantity known as the velocity. An ostrich is running at a speed of 19.5 m/s in a direction of 65° north of west. (a) What is the magnitude of the ostrich's velocity component
  10. Math 115 CH 8

    Compare the population per square mile in Asia to the population per square mile in North America for the year 2000. North America : land area 9,400 (1,000 mi squared) population 305,000,000 Do I divide 305,000,000 by 9,400,000? and do the same for Asia?
  11. Ap CHem

    For how many electrons in Sr. Does A)n=4; l=1 B)n=3;l=2;ml=1 C)n=1;l=1;ml=0 You must know the variations possible. n = 1, 2, 3, ...... l = 0, 1, 2, etc up to n-1. ml=-l to +l (this is -ell to +ell) ms = +/- 1/2 Start with n = 1 and work your way up.
  12. hcc

    how do the masses iof electrons compare with the masses of protons?
  13. Chemistry

    The number of protons in a cation must always be ________ the number of electrons.
  14. Chemistry

    What are the repulsion of protons from one antoher and the repulsion of electrons from one another responsible for?
  15. earth science

    An element's atomic number is 52. How many electrons would an atom of this element have?
  16. Physics

    A metal sphere has a charge of -6 µC. How many excess electrons are there on the sphere?
  17. ochemistry

    How many pi-electrons are in the thiazoline ring of thiamine hydrochloride? of thiamine?
  18. physics

    A metal sphere has a charge of -6 µC. How many excess electrons are there on the sphere?
  19. Science

    What is the max number of electrons in an atom that can have the quantum number: n=2, ms= -1/2
  20. science

    An element's atomic number is 52. How many electrons would an atom of this element have?
  21. physics

    A metal sphere has a charge of -6 µC. How many excess electrons are there on the sphere?
  22. Algebra ii

    City B is due north of city A. City A has a latitude of 14.6 degrees N, and city B has a latitude of 47.2 degrees N. find the distance in kilometers between the cities.
  23. Mun

    vector A is 3.95 m and points 37.4 deg north of east vector B is 6.60 m points 37.9 deg east of north what is the resultant vector
  24. South America

    How has geoghrgphy shaped the way people live in south america
  25. economics

    what are the consequences of providing welfare and subsidies in South Africa?
  26. Life orientation

    Environmental problem impact on your community within south africa
  27. Life orientation

    Environmental problem impact on your community within south africa
  28. p

    What is the momentum of an automobile (weight = 9600 N) when it is moving at 38 m/s to the south?
  29. Economics

    what is the south African government providing in terms of welfare & to whom
  30. life orientation

    Eight ways in which poverty impacts the community in south Africa
  31. geography

    which two state northeast tip us of the south east region
  32. world geogrophy

    BOLIVIA is one of two landlocked country in south america. what is the name of the other countries?
  33. social studies

    Does apartheid still exist in some ways in South Africa? Explain.
  34. Social Studies KKK

    How did the federal government help to reduce the klans's influence in the south?
  35. religion in south korea

    what role does south korea play in their daily lives?
  36. social studies

    How did textile factories improve the economy of South Carolina?
  37. 8th grade, history

    What was life like in spanish settlements in the caribbean and south america?
  38. Geography

    Why have countries in the Pacific South America have developed slowly?
  39. science

    Explain how so many languages spoken in south asia are related?
  40. science

    calculate the momentum of 2.5 kg puppy that is running with a velocity of 4.8 m/s south
  41. world culture

    Explain how so many languages spoken in south asia are related? PLEASE HELP
  42. Economic

    What are welfare payments and we're South African government providing and to whom
  43. history

    How did African Americans help strengthen the Republican Party in the south?
  44. History

    By the end of 1863, what was the general feeling about the war in the South?
  45. history

    why did south african government change racial policy?
  46. Goegraphy

    What is the distance on the ground between two places that are 7cm apart on the south africa
  47. Social Studies

    Are Paraguay and Bolivia the two landlocked countries in South America?
  48. art history

    what is the earliest art piece found for south america
  49. College Physics

    What is the momentum of an automobile (weight = 9700 N) when it is moving at 36 m/s to the south?
  50. South Park

    What websit can i go to to watch full episodes of south park?
  51. social studies

    Nubia was a kingdom to the south of egypt true or false
  52. public administration

    what are the circumstances that determine public policy in South Africa ?
  53. Geograhy

    The role that played by mining in the economy of south africa
  54. History

    List details of the current government in South Africa
  55. World Geo

    Name the south American country with the capital city LA PAZ.
  56. AP Us History

    What traits did the middle colonies have that were not generally present in the south?
  57. Phycics

    Determine the resultant at 21N east and 85N south
  58. us history

    what happenned to the people of the south as the result of the plsse v furgson?
  59. Physics

    If a man walks 4 km east and then 5 km south. How far is he from the point where he started?
  60. history

    What body of water lies SOUTH of Asia Minor?
  61. geography

    if a city has a latitude of 45 degree south, what can you infer about their climate.
  62. Social Studies

    A recent discovery in south america,at a site called___?
  63. Government

    Does Japan have a stronger civil society than South Korea?
  64. History

    How did textile factories improve the economy of South Carolina?
  65. economics

    is south Africa a desirable mix or a free trade?
  66. English

    Is the Midwest vs South a good compare and compassion essay
  67. life orientation

    Two on how geographical distribution of media can be improved in south Afric a
  68. Life Orientation

    How could air pollution in South Africa affect teenagers?
  69. plz help

    Southern latitude range of Brazil, south America
  70. life orientation

    8 ways in which the environmental problem impact within south africa
  71. History

    How “new” was the New South in terms of its labor conditions and its race relations?
  72. social studies

    What materials were/are South America Koji huts made of?
  73. History

    Which river forms the boundary between Georgia and South Carolina?
  74. social studies

    The Cherokee War that was fought in South Carolina took place because:
  75. Geography

    Which countries in south america have the highest literary rates?
  76. Texas History

    Which native tribes lived in the South Plains of Texas?
  77. Social Studies

    What was the life style of free african americans in the south?
  78. Social Studies

    Why was apartheid first used in South Africa? How long did it last? (I am not alound to use wikipedia).
  79. Social studies

    which statement best describes the location of south west Asia
  80. a

    A shortage of what would have devastating consequences for the South during the Civil War?
  81. l.o

    suggest six recommendation on how to address xenophobia in south africa
  82. Inkambeni p school

    How many kilometres on the ground is 3 cm distance on the map of south africa
  83. Geography

    what are the two longest countries in south America??? I'm not sure if it's Argentina, or Brazil? Thanks!!!
  84. english.

    When did ebola spread to south africa. Like what month did it happen?
  85. Social Studies

    What immediate impact did European colonization have on Caribbean South America?
  86. social studies

    how was the south carolina constitution of 1868 different from earlier versions?
  87. Math

    A year on Mars is 686 Earth Days. (1) Which is longer, a year on Mars or a year on Earth? (2)By how many weeks is it longer? Submit two answers. Please explain how you got the answers. My 1st answer was Mars the 2nd answer I 82 1/2 weeks. Please help
  88. English

    Thank you very, very much. Here are some more sentences on the summary of Orwell's 1984. I referred to the websites you suggested to me. 1)The novel describes a future England, Airstrip One, no longer the head of an Empire, but an outpost of Oceania, a
  89. global

    why could it be said that the historic period is only a minute in comparison ti the 24 hours of the day? The historic period began about 5,000 years ago when writing was first developed in Mesopotamia (now Iraq). Modern man has existed for at least 100,000
  90. Physics

    You are traveling on an airplane. The velocity of the plane with respect to the air is 140 m/s due east. The velocity of the air with respect to the ground is 34 m/s at an angle of 30° west of due north. 1)What is the speed of the plane with respect to
  91. physics

    You are traveling on an airplane. The velocity of the plane with respect to the air is 180 m/s due east. The velocity of the air with respect to the ground is 40 m/s at an angle of 30° west of due north. 1)What is the speed of the plane with respect to
  92. Physics

    You are traveling on an airplane. The velocity of the plane with respect to the air is 110.0 m/s due east. The velocity of the air with respect to the ground is 39.0 m/s at an angle of 30° west of due north. 1) What is the speed of the plane with respect
  93. Physics

    The weight of an astronaut plus his space suit on the Moon is only 270 N. A. How much do they weigh on Earth, in Newtons, assuming the acceleration due to gravity on the moon is 1.67m/s^2= 1584is this right? B. What is the mass of the astronaut and his
  94. biology

    Which of the following is the definition of ecology? -the social movement with a goal to protect the environment -the recycling of human-made materials to reduce the waste going into landfills -the study of interactions among organisms and between
  95. Social Studies 7R (Letter)

    Please check this letter if it's good and if there any grammar mistakes. My most exalted Monarch - Your Majesty Queen Isabella, I am writing this letter most humbly for you to consider my request for three small ships and a crew so that I may sail west and
  96. math

    A trench 4 meter long ,2 meter wide and 3 meter high was dug into the ground.find the volume of the earth dug out for making this trench.
  97. SS

    What is the basis for the the economic theory of mercantilism that drove the exploration and settlement of North America by Europeans? Mercantilism is rooted in the idea that a nation’s power stems from the authority of an absolute monarch. Mercantilism
  98. english/revise long paper

    “Invisible Children,” a documentary filmed by three American college students, Jason Russell, Bobby Bailey, and Laren Pole, who set out for Africa in search for a story; however, they discovered the immense suffering of Acholi civilian population in
  99. biology

    In a(an)_______ bond, electrons are transferred from one atom to another? A fatty acid with the maxium number of hydrogen atoms possible is____________? The two basic kinds of neucleic acids are__________ and___________.
  100. Chemistry

    Why are metals malleable? A. Because they reflect incoming photons B. Because they are made of atoms that have tightly held electrons C. Because of their structure and uniform bonding in all directions D. Because their lattice energy is very high I think