Popular questions and responses by al
  1. Chemistry

    How many valence electrons does molybdenum have? (give only 1 answer) Go to this site and look for the electrons available in the outside shells. Click on element #42 and scroll down the menu on the left side until you come to electron configuration.

    asked on April 1, 2007
  2. chemistry

    If the formula of a oxide is X2O3, what is the formula of the chloride of X? (A) XCl3 (B) XCl (C) X3Cl (D) XCl6

    asked on September 8, 2008
  3. Math please help

    So I have this question and I don't understand Find the missing number. 32/52 ?/13 A.) 9 B.) 4 C.) 7 D.) 8 so can anyone help me please

    asked on September 14, 2018
  4. Math fractions

    Jackie loves to cook fried foods. She recorded the total amount of oil that she used each month in the table below. In January she used 3/5 of the amount of oil that she used in Fedruary. Fill in the amount of oil that Jackie used in January in the table

    asked on April 2, 2017
  5. math

    The radius of a circular oil slick expands at a rate of 8 m/min. a. How fast is the area of the oil slick increasing when the radius is 30 m? = 480pi b.If the radius is 0 at time t=0 , how fast is the area increasing after 2 mins? i cannot get part b!

    asked on October 12, 2007
  6. Chemistry

    List Sn , Sn2+, Sn4+ in order of decreasing ionization energy

    asked on October 18, 2015
  7. chem

    Aspartame, an amide, is the sweetener commonly used in diet cola.What is the carboxylic acid that is a reactant in the production of aspartame.

    asked on April 26, 2012
  8. chem.

    How much heat would be required to warm Earth's oceans by 1.0 degree celsius ? Assume that the volume of Earth's oceans is 137x10^7 km^3 and that the density of seawater is 1.03 g/cm^3. Also assume that the heat capacity of seawater is the same as that of

    asked on February 5, 2010
  9. Math

    Lee walks along the edges of a rectangular pool from point A to B to C to D, a distance of 38 metres. Marina walks along the edges of the same pool from B to C to D to A, a distance of 31 metres. What is the perimeter of the pool, in metres?

    asked on October 24, 2017
  10. physics

    An airplane is heading due south at a speed of 734 km/h . A wind begins blowing from the southwest at a speed of 110 km/h (average). In what direction should the pilot aim the plane so that it will fly due south?

    asked on September 3, 2015
  11. Calculus

    a hyperbola passing through (8,6) consists of all points whose distance from the origin is a constant more than its distance from the point (5,2). find the slope of the tangent line to the hyperbola at (8,6).

    asked on October 26, 2014
  12. Physics

    You are walking a dog when the dog sees a cat and runs away from you. You immediately run after the dog at 5.50 m/s. You jump at an angle of 29.0° to try and catch the dog. While you are in the air the dog is able to move an extra 1.34 m away from you. If

    asked on September 27, 2016
  13. Math

    A number and its absolute value are equal. If you subtract 2 from the number, the new number and its absolute value are not equal. What do you know about this number? What is a possible number that satisfies these conditions?

    asked on October 12, 2014
  14. Geometry

    The circumference of a circle is 20 pi cm. Find diameter, radius, and area of the disk, the length of an arc of 90 angle and area of a 90 angle sector. Answer in terms of pi. d= ___ r= _____, disk area= _______ arc length =______, sector area =________

    asked on February 26, 2015
  15. chem

    carbamic acid and ammonia react to form an amide and water. What is the amide product of this reaction.

    asked on April 26, 2012
  16. Chemistry

    A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.135g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28 ∘C the osmotic pressure produced by the solution was 0.138

    asked on June 27, 2014
  17. Physics

    7. A plastic cup, 15.0 cm in height, is filled to the rim with water. A small hole is punctured in the cup at a height 9.00 cm above the bottom of the cup and is allowing water to spew out. At what distance does the water land from the bottom of the

    asked on July 1, 2012
  18. calculus

    lim_(theta->0)(cos(6 theta)tan(6 theta))/(theta)

    asked on June 2, 2012
  19. algebra

    The equation f(x) = 4x2 − 16x + 9 represents a parabola. What is the vertex of the parabola? (2, −7) ( −2, 57) (4, 9) ( −4, −137)

    asked on April 11, 2016
  20. math

    The sum of the reciprocals of two consecutive even integers is 11/60. Find the integers....... 1/n + 1/(n+2) = 11/60 what is the question? the question is, "What is the value of the integers? I will be happy to critique your work. We don't do it for

    asked on February 1, 2007

    Identify the conjugate base in the following reaction. H2O (l) + HCO31- (aq) ¨ H3O+ (aq) + CO32- (aq)? Identify the Bronsted-Lowry acid in the following reaction. H2O (l) + HCO31- (aq) ¨ H3O+ (aq) + CO32- (aq)

    asked on December 3, 2014
  22. geometry

    Find the value of x When one angle is 67 degrees and The lenthb of the triangle is 21

    asked on February 8, 2012
  23. calculus

    A landscape architect wished to enclose a rectangular garden on one side by a brick wall costing $30/ft and on the other three sides by a metal fence costing $10/ft. If the area of the garden is 42 square feet, find the dimensions of the garden that

    asked on November 4, 2007
  24. physics

    a car starts from rest and accelerates at in a straight line at a constant rate of 4.5m/s/s. How far will the car travel in 35 seconds.

    asked on November 22, 2011
  25. Physics

    A diver running 1.2 m/s dives out horizontally from the edge of a vertical cliff and reaches the water below 3.1 s later. How high was the cliff and how far from its base did the diver hit the water?

    asked on November 14, 2010


    asked on October 9, 2007

    explain a theme in the great gatsby, multiple paragraphs What theme do you want to explain? Please post your answer here and someone may be able to critique it for you. tragedy and the american dream

    asked on February 11, 2007
  28. MATH

    a rodeo performer spins a lasso in a circle perpendicular to the ground. the circle has a diameter of 118cm. she starts with the knot at the lowest point which is at 90 cm above the ground, she spins the lasso and .5 seconds later the knot is at the

    asked on January 16, 2015
  29. math

    Consider an equilateral triangle with points located at each vertex and at each midpoint of a side. (See picture.) This problem uses the set of numbers {1, 2, 3, 4, 5, 6}. Place one number at each point. Call the sum of the three numbers along any one side

    asked on October 10, 2014
  30. Chemistry question Please help

    Consider the expected conductivities of CaCl2(aq) and Ca(OH)2(aq). Which of these can be expected to have the higher conductivity. Explain your reasoning.

    asked on October 11, 2011
  31. math

    N and P are integers greater than 1 5N is the square of a number 75NP is the cube of a number the smallest value for N+P IS what? i cant figure it out, please help thank you so much

    asked on October 4, 2010
  32. Chemistry

    NH3(g) + 202(g) = HNO3(aq) +H2O (l) Is this reaction a combination, decomposition, single replacement, double replacment or other? Also is it redox or non redox?

    asked on May 3, 2010
  33. 8th grade

    Suppose a researcher wants to study the effectiveness of a new reading program for students who have not acquired the necessary reading skills by the time they reach the 8th grade. A randomly selected group of 50 students from a local junior high with poor

    asked on December 21, 2009
  34. physics

    A 50 kg skater pushed by a friend accelerates 5 m/sec. How much force did the friend apply?

    asked on November 26, 2007
  35. Easy Chemistry

    How many valence electrons does molybdenum have? it depends, it can either have valence electrons of 6,5,4,3,2.

    asked on March 29, 2007
  36. Math

    Which ratio is equivalent to 3/15 A) 1/3 B) 3/5 C) 1/5***** D) 15/3

    asked on November 13, 2018
  37. physics

    Machines A, B, and C do the same amount of work, but they each take a different amount of time. Machine A takes more time as compared to machine C. Machine B takes the maximum time to do the same amount of work. Which machine expends the most power doing

    asked on May 21, 2017
  38. Chemistry

    2Fe2O3 + 6C + 3O2 -> 4Fe + 6Co2 What mass of Fe2O3 present is needed to produce 15 of iron? what mass of CO2 is released when 15g of iron is produced?

    asked on October 18, 2015
  39. prealgebra

    translate; the quotient of 41 and the product of a number and 35

    asked on September 17, 2015
  40. geometry

    find the area bounded by a regular pentagon with radius 6 cm. round to the nearest tenth.

    asked on March 2, 2015
  41. Chemistry

    what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble

    asked on February 23, 2015
  42. Chemistry

    what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble

    asked on February 20, 2015
  43. English

    I'm writing an article for my english exam prep, and my main topic that i went off of was the relationship between school, homework and stress on teenagers (the exam prep topic is relationships) in the article I talk about how homework is a large stress in

    asked on June 3, 2014
  44. Chemistry

    During an acid-base titration, 25 mL of NaOH 0.2 M were required to neutralize 20 mL of HCl. Calculate the pH of the solution for each: a) Before titration b) After adding 24.9 mL of NaOH c) At equivalence pt d) After adding 25. 1 mL of NaOH e) The pH of

    asked on May 10, 2014
  45. Physics

    6) The relationship between force and acceleration is given by Newton’s 2nd Law: Fnet = ma. In this case this becomes: Fapp – Ff = ma. a. Rearrange this formula to fit the equation of a straight line: y = mx + b b. What does the y‐intercept

    asked on October 30, 2013
  46. AP Chem

    MnS(s) + 2 H+ --> Mn2+ + H2S(g) At 25 C the solubility product constant, Ksp, for MnS is 5 x 10-15 and the acid dissociation constants K1 and K2 for H2S are 1 x 10-7 and 1 x 10-13, respectively. What is the equilibrium constant for the reaction represented

    asked on January 13, 2013
  47. math

    rewrite each expression using the distrubitive property 6x + (-5x)

    asked on November 13, 2012
  48. Algebra

    I solve this equation by the substitution method 7x-4y=13 x=3 and I got y=2 and x=3 am I right. Thanks

    asked on September 16, 2011
  49. chemistry

    Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth's oceans, because of their high heat capacity, can absorb heat and therefore act to slow

    asked on February 5, 2010
  50. Chemistry

    When ice melts, it absorbs 0.33 per gram. How much ice is required to cool a 11.0 drink from 75 to 37, if the heat capacity of the drink is 4.18 ? (Assume that the heat transfer is 100 efficient.)

    asked on February 5, 2010
  51. science

    why do carbonated drink errode the iron nail? thank you.

    asked on March 30, 2009
  52. math

    A woman exerts a horizontal force of 2 pounds on a box as she pushes it up a ramp that is 6 feet long and inclined at an angle of 30 degrees above the horizontal. how do you find the work on the box?

    asked on January 27, 2009
  53. government

    these are some questions i am having trouble with: 1. what margin is required to ratify treaties 2. where in the constitution is the ratification power described 3. what body has the power to impeach the president 4. what vote is required to impeach 5.

    asked on September 23, 2007
  54. Help w/Quattro Formula

    Am getting frustrated w/failing to get Quattro Pro formula right. Here's what I'm looking for: Col. A = Base period number Col. B = Given number this current period. Formula I need: If B >= A, what is %? (Example: A=20, B=30, the # I want should read 50.0,

    asked on July 20, 2006
  55. pre-calc

    A dog is attached to a 2121​-foot rope fastened to the outside corner of a​ fenced-in garden that measures 1818 feet by 2323 feet. Assuming that the dog cannot enter the​ garden, compute the exact area that the dog can wander.

    asked on July 12, 2019
  56. Math

    Use benchmark to estimate the sum, difference, or product 14/16 + 1/5 A. 2 B. 0 C. 1/2 D. 1

    asked on October 3, 2018
  57. Social Studies

    As a result of their large oil supplies many Middle Eastern economies rely on what in oder to grow? A) automobile manufacturing B) government regulations C) exports D) tariffs

    asked on September 24, 2018
  58. Physics

    Water flows from a fire truck through a hose that is 11.7 cm in diameter and has a nozzle that is 2.0 cm in diameter. The firemen stand on a hill 5.0 m above the level of the truck. When the water leaves the nozzle, it has a speed of 20.0 m/s. 1) Determine

    asked on April 10, 2017
  59. us history

    You have OREGON FEVER! On your voyage west, there are many things you must plan for if you plan to make it to your final destination. Choose one of the following to complete and submit to Mrs. Sterling through webmail for extra credit. • You are

    asked on April 15, 2016
  60. Chemistry

    When methane is combusted with excess oxygen 891 kJ of energy is produced start with 100g of methane. how much energy is produced? is this reaction endothermic or exothermic? Also provide enthalpy change for this reaction: CH4 + 2O2 (arrow)= CO2 + H2O +

    asked on October 19, 2015
  61. Chemistry

    Element X has the highest first electron affinity in its period; the ground state electron configuration of it's most common ion is [Kr] 5s^2 4d^10 5p^6 a Element Y is the second largest element in it's period; it's valence electrons are in orbital(s) that

    asked on October 18, 2015
  62. math

    A basket contained 75 brown eggs and some white eggs. Salima found that 15% of the total number of eggs were rotten. Of the rotten eggs,2/3 were white and the remaining 6 were brown. a) How many white eggs were there altogether? b) How many eggs were not

    asked on February 19, 2015
  63. Math

    Kelly was helping a friend with cleaning her bedroom. Kelly spent two hours and cleaned 80% of the room. what fraction of the room did Kelly help clean? How would I solve this - divide?

    asked on January 21, 2015
  64. math

    Downtown Mathville is laid out as a square grid of 9 North-South streets and 9 East-West streets (See diagram). Your apartment is located at the Southwest corner of downtown Mathville. (See point T.) Your math classroom is located in a building that is 6

    asked on October 19, 2014
  65. math

    1. Finding the Counterfeit Coin. You have 5 coins. You know that one of them is counterfeit and weighs less than the others. Suppose also that you have a balance scale. Is there a strategy for finding the counterfeit coin using the balance scale only

    asked on September 30, 2014
  66. chemistry

    A mixture of 3.00 g of silver and copper metals was dissolved in excess nitric acid. Resulting salts, silver(I) nitrate and copper(II) nitrate, were isolated and dissolved in enough water to make 0.100 L of a solution with a total concentration of the

    asked on September 29, 2014
  67. Math

    Kelly's scores on the first three tests in her physics class are 79, 84, and 68. Determine all scores on the fourth test that will yield an average test score of at least 80.

    asked on May 24, 2014
  68. physics

    A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass M=100kg) that can convert 25% of the rotational kinetic energy into translational kinetic energy. The mass of the car is 1000kg ( including flywheel). Suppose the car is at rest, and

    asked on December 30, 2013
  69. TRIG

    Given that tan¤=3/4 and ¤ is in the second quadrant find sin2¤ (¤=theta)

    asked on July 11, 2012
  70. TRIG

    Given that tan¤=3/4 and ¤ is in the second quadrant find sin2¤ (¤=theta)

    asked on July 11, 2012
  71. Math

    The price of a camera increased from $75 to $90 find the percent of the increase price

    asked on May 9, 2012
  72. math

    Mrs Sim spent some money on 45 buns. She spent the same amount of money on 20 muffins. Each muffin cost $0.95 more than each bun. How much did she spent altogether?

    asked on April 18, 2012
  73. COMM215

    Can you tell me if everything is correct? Final Grammar Test Part I: True or False 1. The following word group is a FRAGMENT: That movie, one of my favorites. _X_True __False 2. The following word group is a FRAGMENT: The local baseball team, needing a

    asked on February 23, 2012
  74. algebra

    Janelle has $ 20 and is saving $ 6 per week. April has $ 150 and spending $ 4 per week , when will they both have the same amount of money ? i know by trial and error i will get 13 weeks, but how do i solve it by algebra ? please

    asked on January 10, 2012
  75. chemistry

    A volume of 25.0 mL of 0.100 M CH3CO2H is titrated with 0.100 M NaOH. What is the pH after the addition of 12.5 mL of NaOH? (Ka for CH3CO2H = 1.8 x 10-5)

    asked on May 31, 2011
  76. math

    solve with substitution 5x - y=-1 15x=2y

    asked on January 12, 2011
  77. Chemistry

    The solubility of calcium sulfate at 30 degrees C is .209 g/100mL solution. calculate its Ksp.

    asked on November 29, 2010
  78. math

    Let AB be a diameter of a circular track. Tom starts from point A running clockwise on the track. At the same time Jerry starts from Point B running counterclockwise on the track. Each person runs at a constant speed. They first meet after Tom has run 200

    asked on April 26, 2010
  79. algebra


    asked on April 12, 2010
  80. science

    a word for a profile or side view

    asked on October 4, 2009
  81. Physics

    (1) A virtual image -7 cm tall and 17 cm away from a mirror is created by an object 7 cm away from a mirror. How tall is the object? What kind of mirror created the image? What is its focal length? (2) If a 1.75 m tall man is looking at a plane mirror from

    asked on February 19, 2009
  82. pre-cal

    show solution solve. 2sin^(2)x=2+cosx

    asked on December 19, 2008
  83. physics

    the region 0 < r < r1 is a charged insulating sphere with uniform charge density _E, the region r1 < r < r2 contains free space, and the region r2 < r < r3 is an insulating spherical shell with uniform charge density ��_E. What is the

    asked on September 23, 2008
  84. chemistry

    how much oxygen is produced by heating 20g of mercury (II) oxide if 18.6g of mercury is produced?

    asked on March 24, 2008
  85. chemistry

    what type of compound is benzoic acid

    asked on November 28, 2007


    asked on September 23, 2007
  87. trig

    How do I find 1 positive and 1 negative coterminal angle for: 1) -460 degrees 2) 11pi/4 3) -12pi/5 WERE DO YOU GO TO GOOGLE BECAUSE I TIRED!

    asked on January 17, 2007
  88. Word Problem /Math

    Angel's car gets 32 miles per gallon and Mo's car gets 22 miles per gallon. When traveling from Morgan Run to Clinton, they both used a whole number of gallons of gas. What is the closest that Morgan Run and Clinton could be? How many gallons did Angel's

    asked on December 10, 2006
  89. Maths

    A glass is 4/7 full then 70 cm3 of orange juice is poured in the glass is now 3/4 full what is the total volume of the glass?

    asked on January 29, 2020
  90. Math

    I am in even 3 digit number I am less than 200 but more than 190 my son is 18 what is my number

    asked on August 27, 2019
  91. math

    7 1/2-1 9/10 what is the difference? PLZ Help!!!!!

    asked on November 2, 2018
  92. physics

    If you pull one end of the rope 1.4 downward with a 46- force, find the height you can lift a 170- load.

    asked on October 9, 2018
  93. Math please help me quickly

    1/4 divided by 3/8 and I'm so confused because I know it's division but the answers are A.1/3 B.2/3 C.3/4 D.3/8 and I just need help

    asked on September 25, 2018
  94. Physics

    An airplane traveling at 200 mph in a direction of 40 degrees north of east encounters a wind blowing east at 50.0 mph. Find the velocity of the plane measured from the ground.

    asked on September 26, 2017
  95. college chemistry

    How many grams of NaCN are needed to react with 50.0 g of MgCl2?

    asked on February 18, 2017
  96. Statistics

    A VP of manufacturing claims that more than 3% of items produced using a certain assembly line are defective. A random sample of 400 items is selected. At the 10% level of significance, which of the following would be part of the standardized decision

    asked on October 25, 2016
  97. laney college

    The following questions are based on the “Mt. Dome, California,” quadrangle (Figure 33-2 found on page 228 of the Laboratory Manual; enlarged to scale 1:48,000; contour interval 40 feet) and the stereogram of the same

    asked on March 23, 2016
  98. English assignment

    I need to make a thesis statement about racism based on my two books. The two books that I chose to do was: secret life of bees and black like me. I am having trouble making a thesis. I'll give you all the information about the racism in these two books.

    asked on January 13, 2016
  99. Chemistry

    when potassium in water are combined they produced 4000.0 kJ of heat along with potassium hydroxide and hydrogen gas. how much energy would be produced if you dumped a 1.00 kg chunk of potassium into a swimming pool? s this reaction what is the enthalpy

    asked on October 19, 2015
  100. physics

    PLEASE HELP! When Babe Ruth hit a homer over the 10 m -high right-field fence 80 m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.2 m above the ground and its path initially made a 39 ∘

    asked on September 8, 2015


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