Popular questions and responses by Lenny
  1. Chemistry

    In the recovery of iron from iron ore, the reduction of the ore is actually accomplished by reactions involving carbon monoxide. Use the following thermochemical equations, Fe2O2(s) + 3CO(g) ---> 2Fe(s) +3CO2(g) ΔH° = -28kJ 3Fe2O2(s) + CO(g) --->

    asked on March 24, 2015
  2. English(work cited page)

    I am trying to cite an article in Rereading America, but it was written by the editors of the book. I am having a hardtime citing it. Also its suppose to be in MLA format.

    asked on April 18, 2009
  3. physics

    A hypodermic needle consists of a plunger of circular cross-section that slides inside a hollow cylindrical syringe. When the plunger is pushed, the contents of the syringe are forced through a hollow needle (also of circular cross section). If a 4.0- N

    asked on April 24, 2012
  4. ph

    An electron is located within an electric field, with a strength of 800N/C. What is the magnitude of the force on the electron?

    asked on February 26, 2017
  5. calc

    Give the starting value a, the growth rate r, and the continuous growth rate k. Round the answer for r to two decimal places Q = 0.414(e^0.885)^t a = ? r = ?% k = ?% I found a to be 0.414 but when finding the percentage for r and k I got stuck.

    asked on October 3, 2014
  6. Math

    A Norman window has the shape of a rectangle surmounted by a semicircle. (Thus, the diameter of the semicircle is equal to the width of the rectangle.) If the perimeter of the window is 30 ft, find the dimensions of the window so that the greatest possible

    asked on November 23, 2013
  7. literature

    In invierno tardio by antonio colinas what is he comparing his spirit to? No es increíble cuanto ven mis ojos: nieva sobre el almendro florido, nieva sobre la nieve. Este invierno mi ánimo es como una primavera temprana, es como un almendro floroido bajo

    asked on January 20, 2015
  8. chem

    2Na(s) + 2H2O(l) ==> 2Na^+(aq) + 2OH^-(aq) + H2(g) What is the the net ionic equation because it doesn't look like their is any spectator ions.

    asked on April 21, 2009
  9. algebra

    Kenny buys mixed nuts at a corner market for per pound. The cost is a function of the number of pounds of nuts bought. What is the graph of the function? Is the function continuous or discrete?

    asked on December 6, 2011
  10. chem

    The molecular formula is: Na(s)+ H2O(l)---->NaOH(aq)+H2(g) This is showing a single displacement reaction.I am not sure how to show the complete ionic equation, this is what I have so far: Na+(s)+ H+ H+O2-(l)---->Na+OH-(aq)+H2+(g) Is this how you show it?

    asked on April 21, 2009
  11. Physics

    A ball (mass of 0.5kg) is suspended on a string that is attached to the ceiling. The ball is charged with an unknown charge q. Determine the magnitude of the charge on the ball if the electric field strength is 2000N/C, and the string forms an angle of θ

    asked on February 26, 2017
  12. Physics

    A ferry-boat is rectangular in shape, with an overall area of 30.0 m2. When the boat is loaded with gravel, it sinks to a depth of 2.8 m in the water. What is the total weight of the boat + gravel? Show your work.

    asked on February 7, 2017
  13. everest

    What will be the total deduction for social security and Medicare taxes on Juanita's next weekly paycheck of $720 if she has already earned $10,800 this year? Social security tax is 6.2% of wages up to $106,800. Medicare tax is 1.45% of all wages.

    asked on June 8, 2014
  14. science

    Which requires more work - running around the block or walking around the block?

    asked on December 2, 2009
  15. ell

    1}why do desert people cover them selves from head to toe? 2}why do some animals stay underground during the day? please write soon thank you

    asked on April 21, 2009
  16. math

    If point P(-3,5) is reflected in the line y=-5, what will be the coordinates of the reflection of point p

    asked on July 22, 2019
  17. Math

    After delivering all of those presents, the elves were ready to eat some cookies. 50% of the cookies were sugar, and the rest were gingerbread. After eating 1,600 cookies, the number of sugar cookies decreased by 20% and the gingerbread cookies decreased

    asked on January 8, 2018
  18. Physics

    Dean is hunting in the Northwest Territory at a location where the earth's magnetic field is 7.0x 10^-5 T. He shoots at a duck decoy by mistake, and the rubber bullet he is using acquires a charge of 2.0 x 10 ^ -12 C as it leaves his gun at 300m/s,

    asked on April 10, 2017
  19. chemestry

    what causes #catrax???.....it an eye diseses which causes a suffering petient blindness for sometimes in which the patient have head pain the blindness occars now i wan know what causes it n how it should be treated??

    asked on March 8, 2017
  20. social studies

    what can be that it's old and it's new at the same time??

    asked on March 8, 2017
  21. Physics

    If you suspend a 90-N rock beneath the surface of ethanol, the tension required to support it is only 60 N. What volume of ethanol (density of 789.2kg/cubic meter) must therefore be displaced? Show your work.

    asked on February 7, 2017
  22. Physics

    Explain in detail how you would find the density of an unknown high-density object if you had only the objects listed below.If you show calculations, make sure you define your variables.Assume all containers are large enough to hold the object.... You

    asked on February 7, 2017
  23. physics

    Mrs. Johnson's kid is trying to drink with a straw that runs through an airtight cork in the top of a bottle of water. Please explain to her kid why he won't get any water.

    asked on February 6, 2017
  24. Math

    Can you show or explain how to do this? Julio uses a scale of 1/8 inch= 1 foot when he paints landscapes. In one painting, a giant sequoia tree is 34.375 inches tall. How tall is the real tree?

    asked on February 6, 2016
  25. Chem

    What simplifying assumptions do we usually make in working problems involving equilibria of salts of polyprotic acids? Why are they usually valid? Answer by selecting all true statements. Are the answers: a,b,d,and f A)If the two ionization constants are

    asked on February 27, 2015
  26. math

    what do they mean by find the sum of 28g +14g and how do I do it

    asked on February 6, 2015
  27. math

    If Will gives Molly $9, he will have the same amount of money as her. If Molly gives Will $9, the ratio of the money she has to the money Will has will be 1 : 2. How much money does Will have in the beginning?

    asked on January 28, 2015
  28. math

    sue had $100 gift card for the candy store. the store had a 15% discount off all retail prices with no sale taxes. there is a $12.00 package fee on each sale. if sue wants to spend exactly $100 including the discount and package fee, what is the greatest

    asked on November 20, 2014
  29. Algebra 2

    An archer releases an arrow from a shoulder height of 1.39 m. When the arrow hits the target 18 m away, it hits point A. When the target is removed, the arrow lands 45 m away. Find the maximum height of the arrow along its parabolic path. My points are

    asked on December 5, 2013
  30. chem

    The min. energy needed to break a C-Br bond is 288000mol^-1. If one has access to laser with 3 output wavelengths 266,1065,800nm, which wavelength(s) can be used to break that bond? I keep getting 417nm for the wavelength (which is none of the outputs) but

    asked on November 24, 2013
  31. Chemistry

    A student was given 100mL of HCL solution in a 250mL beaker and told that the HCL was 0.11M. The student was also given phenolphthalein indicator and 250 ML of 0.1234 M NaOH. The student first filled a buret with NaOH solution. The student then placed an

    asked on November 21, 2013
  32. Math

    Explain what benchmark you would use to estimate the number of people that can ride on a bus.

    asked on September 3, 2013
  33. Algerbra 1

    What is the order of √5 , -0.1, -5/3 , 0.7, √2 from least to greatest? A. 0.7, √2 , -5/3 , √5 , –0.1 B. √5, √2 , 0.7, -5/3 , –0.1 C. -5/3 , –0.1, 0.7, √2 ,√5 D. –0.1, 0.7, √2 , √5, -5/3

    asked on July 23, 2013
  34. Algerbra 1

    What is the simplified form of the expression? -(8d - 3w) A. 8d - 3w B. -8d + 3w C. 8d + 3w D. -8d - 3w

    asked on July 23, 2013
  35. Physical Science

    Because light travels in a straight line and casts a shadow, Isaac Newton hypothesized that light is A. a stream of particles. B. a wave. C. heat.

    asked on June 12, 2013
  36. Physical Science

    Which kind of light is used to carry information through optical fibers? A. fluorescent B. sodium-vapor light C. laser

    asked on June 12, 2013
  37. maths

    identify and describe 3 environmental health hazards that causes ill health

    asked on May 2, 2013
  38. math

    Draw and label line BN. Draw and label point T on it

    asked on September 19, 2012
  39. Physics

    1. A 2.5kg rock is dropped from a 350m cliff. It hits the ground with a speed of 60 m/s. What percent of its mechanical energy was lost to air resistance? -the answer is 48% 2. A motor uses 5500J to lift a 35kg object a vertical distance of 12m. What is

    asked on June 17, 2012
  40. physics-HS

    Just as a car tops a 49 meter high hill with a speed of 77 km/h it runs out of gas and coasts from there, without friction or drag. How high, to the nearest meter, will the car coast up the next hill? plzzz help!

    asked on April 8, 2012
  41. health informatics

    how is emerging technology influencing healthcare? and give an example. all what i know is that they are basiclly new technologies and my example is about tissue engineering but the problem is that i don't know how it influences the healthcare!!! so please

    asked on March 3, 2012
  42. Trig

    The set of solution(s) of 2 cos^2 (θ) - 13 cos(θ) + 6 = 0 that is(are) in the interval (0,π/2) is one of following a. {π/6} b. {π/3} c. {π/4} d. {π/3, π/6} e. {π/6, π/4}

    asked on December 13, 2011
  43. biology!!

    why do Mountain dwellers have higher averages of hemoglobin than people living in coastal areas?

    asked on December 2, 2011
  44. science-biology

    A family member recently found out her child's blood group was AB+ yet hers is O+. i'm suppose to explain this oddity but i don't know how? so please help me!!! thanks

    asked on December 2, 2011
  45. science-biology

    A family member recently found out her child's blood group was AB+ yet hers is O+. i'm suppose to explain this oddity but i don't know how? so please help me!!! thanks

    asked on December 2, 2011
  46. Sociology

    Which sociological perspective holds the view that people create their social worlds through interaction and manipulation of symbols? A. Functionalist B. Conflict C. Interactionist D. Global

    asked on September 4, 2011
  47. Chemistry

    Compare and Contrast the atomic theories proposed by Democritus and John Dalton.

    asked on February 3, 2011
  48. 10th grade

    change 114/8 to a mixed fraction in simplest form

    asked on December 2, 2010
  49. physics

    A student bikes to school by traveling first d_N = 1.10 \rm {miles} north, then d_W = 0.500 \rm {miles} west, and finally d_S = 0.200 \rm {miles} south. If a bird were to start out from the origin (where the student starts) and fly directly (in a straight

    asked on September 21, 2010

    what is the connection between the amount of albedo and energy absorbed?

    asked on February 21, 2010
  51. Physics

    A race car traveling at 44 m/s is accelerated to a velocity of 22 m/s over an 11 s interval. What is the displacement of this time? (Could you show how you got the answer?) Thank you

    asked on February 14, 2010
  52. math

    I want to creat a line graph.My range is 40-140 for my y-axis, I wanted to know can I plot my graph so I start with 40. Imagine this is my graph can I start with 40 and increase with incraments of 5: 0,40,45, 50... If this is not correct then what is the

    asked on May 20, 2009
  53. english( racism)

    I am writing about racism in los angeles, and I have to use newspaper articles. I wanted to show that African earn less money than whites. Also their are more African americans behind prision bars. however, I cannot find anything along these lines. It has

    asked on May 8, 2009
  54. chemistry

    In my chemistry lab we decomposed lead (iv) oxide by heating it and then placing a wooden splint(test the evloved gas) into the mouth of the test tube. The color changed into red lead ( Pb304).Then we reheated the sample again and it turned to PbO. I do

    asked on April 20, 2009
  55. Math

    Simplify. -81^1/4

    asked on April 3, 2009
  56. 12th grade

    A Lesson Before Dying " I had gone to barbershops;I had stood on street corners, and i had gone to many suppers in the quarter.But i had never really listened to what was being said.Then i began to listen, to listen closely to how they taked about their

    asked on December 3, 2008
  57. Math

    150 students sat exams. The following elements were calculated ΣFX = 10200 Σ(x-μ)F = 196348 Determine the number of students whose marks were within 2 standard deviations of the mean score

    asked on October 3, 2008
  58. civics/ minnesota state goverment

    how many state constitutions has MN had?

    asked on May 17, 2008
  59. Science

    Describe briefly a general method that could be used to find the density of a substance. that the question im not quite sure of the answer some help would be nice.... thank you!

    asked on September 6, 2007
  60. History

    What factors motivated King Leopold of Belgium to seek ownership of the Congo region? http://en.wikipedia.org/wiki/L%C3%A9opold_II_of_Belgium Thank you for using the Jiskha Homework Help Forum. Hopefully you have a good history of the Congo. I'm sure we've

    asked on August 19, 2007
  1. Math


    posted on April 23, 2018
  2. MATH

    It’s actually 1.D 2.C 3.A 4.B 5.D On the quick check for connexus.

    posted on March 15, 2018
  3. word problem math


    posted on March 7, 2018


    posted on April 24, 2017
  5. 3rd grade

    c 2 and 5 trump broke the computer

    posted on February 8, 2017
  6. Math

    The other part was triangle ABC. Side A had the number 8, Side B had 10, and Side C has 16.

    posted on February 6, 2016
  7. Math

    What did you do to get 275?

    posted on February 6, 2016
  8. Chemistry

    Correction: 3Fe2O3(s) + CO(g) ---> 2Fe3O4(s)+ CO2(g) ΔH° = -59kJ Is this right? FeO(s) + CO(g) ---> Fe(s) +CO2(g) ΔH° = -28/2 ΔH° = -14

    posted on March 24, 2015
  9. Chemistry

    Is this correct? (x ^ 2) / 2.0 = 5.0 x 10 ^ -2 x = 3.162E-1 = [H +] = [H2PO3-] pH = -log (3.162E-1) = 0.50

    posted on February 28, 2015
  10. Chemistry

    x^1 - 6.25E-3 + 2.0625E-4 = 0 x = {-(-6.25E-3) +/- sqrt[(6,25E-3)^2 - (4*1*2.0625E-4)]}/(2*1) x = -1.089E-2 (Not x) or 1.714E-2 pOH = -log(1.714E-2 = 1.76 pH = 14-1.76 = 12.24

    posted on February 28, 2015
  11. Chemistry

    Is this the right answer? Kb = 1E-14 / 1.6E-12 = 6.26E-3 x^2/-0.033 = 6.26E-3 x = 1.436E-2 pOH= -log(1.436E-2)= 1.84 pH= 14 - 1.84 = 12.16

    posted on February 28, 2015
  12. CHEM UNI

    helper look for my question and help me please

    posted on February 6, 2015
  13. math

    is the answer 151 base 9

    posted on February 6, 2015
  14. math


    posted on February 6, 2015
  15. math

    sorry it was with base 9 in both numbers

    posted on February 6, 2015
  16. literature

    okay thsnks

    posted on January 20, 2015
  17. literature

    is he comparing his spirit to winter or to spring? that is what i am having a hard time finding.

    posted on January 20, 2015
  18. literature

    It is not incredible how much my eyes see It is snowing on the flowery almond tree It is snowing upon the snow. This winter my spirit is like an early spring, it is like a flowering almond tree (check that word floroido because there is no such word!)

    posted on January 20, 2015
  19. physics

    thanks a lot i appreciate it

    posted on April 28, 2012
  20. 4th grade

    It should be groups of not times

    posted on April 10, 2011
  21. chemistry

    no reaction

    posted on April 5, 2011
  22. English(work cited page)

    Is this correct? Colombo, Gary, Robert Cullen, and Bonnie Lisle. “Learning Power.” Rereading America: Cultural Contexts for Critical Thinking and Writing. Ed. Gary Colombo, Robert Cullen, and Bonnie Lisle. 7th ed. Boston: Bedford/St. Martin’s, 2007:

    posted on April 18, 2009
  23. history

    That's what I would go with.

    posted on April 3, 2009