chemistry! URGENT

61,713 results, page 15
  1. math urgent please

    How many league matches were played, write an algebraic expression to denote the number of league matches between the teams, if the number of teams is n.
  2. Calculus(Urgent help)

    f(x)=x^3-3x^2+3x+1 near 2 (at a=2) A. Use Linear approximation to approximate. this underestimate or overestimate? Justify answer. C.Approximate f(2.25) using the linear approximation and compare the answer with the exact value. Thanks.
  3. social studies

    i need help on some questions: 1. How does totalitarian government gain power and maintain power? 2. What kind of freedoms does totalitarian government have? 3. Who is eligible to vote? 4. Who is in control? Who makes the decisions? how does this change if
  4. Econ - urgent please help

    Suppose local govt decides that a tax is the best way to address the inefficiency created by outdoor concerts. Assuming the social cost curve and the private cost curve are parallel to each other, how much does the tax on concerts have to be to achieve the
  5. PHYSICS -urgent

    A bomber in level flight, flying at 92m/s, releases a bomb at a height of 1950m. (a) How long is it before the bomb strikes earth? (19.9s) (b) How far does it travel horizontally? (1832m) (c) What are the horizontal and vertical components of its velocity
  6. Help (URGENT)

    If this is a graph from 1996, someone listed in the 30-34 age group would be in which age group in 2016? (hint: each age group goes up by five years) GRAPH: 30-34 35-39 40-44 45-49 50-54 55-59 60-64 65-69 70-74 75-79 80-84 85+ Can someone pleaseh help me?
  7. chemistry

    I have a chemistry project where I need to make an object move using my knowledge of chemistry. The object os a small ball the size of a large marble. It must be moved using chemistry and NOT physics (ie slope wind etc). I am 15 and in grade 11.
  8. Maths urgent help needed!

    A rectangular tank measures 60cm by 40cm by 30cm. It is half filled with water. Water is added to the tank at a rate of 13litres per minute and drained out at 9litres per minute. Find the volume of water in the tank after 7 minutes.
  9. Math to Ms.Sue (urgent )

    11.   Lorenzo has a checkbook balance of $118.00. He writes two checks, one for $9.00 and one for $84.25. He then deposits $95.00. Finally, he uses his calculator to determine his new balance. Which one of the following series represents the correct
  10. Pre calc 12 urgent help pls!

    Radioisotopes are used to diagnoa various illnesses. Iodine-131 is adminsitred to diagnoaw thyriod gland activity. Original dosage contains 280 MBq of Iodine-131. If. One is lost from body then after 6h, there r 274 MBq. What is half life of I-131 to the
  11. HELP URGENT Phyiics

    What mass (in grams) of steam at 100°C must be mixed with 446 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 65.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, and
  12. calculus (please help. URGENT!)

    A hemispherical tank with a radius of 10m is filled from an input pipe at a rate of 3m^3/min. How fast is the water level rising when the water level is 5m from the bottom of the tank? (hint: the volume of the cap of thickness of h sliced from a sphere of
  13. Math

    Not Urgent But Please Check My Answer: A pencil at a stationery store costs $1, and a pen costs $1.50. Stella spent $21 at the store. She bought a total of 18 items. Which system of equations can be used to find the number of pencils (x) and pens (y) she
  14. physics urgent help !

    if a 3e charge is at the origin and a magnesium nucleus is 3 cm from the originin the x-axis direction.what is the magnitude of the net electrostatic force a Boron nucleus would experience at the point half way between magnesium nucleus and 3e charge on
  15. math(urgent)

    Mary invested $30,000 in two accounts some at 12% per annum and the rest at 8% per annum. Her total interest for one years was $ 3200.How much was invested at each rate ? solution : $3200=P1 (0.12)(1)+ (3000-P1)(0.08)(1) P1= ? P2= 30000-P1 ? HOW to solve
  16. URGENT ANY PhYSIcs teacher help thouroighly pls

    The coefficiant of friction between rubber tires and wet pavement is 0.5. Breaks are alllied to a 750kg car, intitally travelling at 30 m/s and the car skids to a stop. What is the magnitude and direction of the acceleration. Ik the magnitude and i kinda
  17. physics URGENT! HELP

    If an object is thrown in an upward direction from the top of a building 1.60 x 102 ft. high at an initial velocity of 21.82 mi/h, what is its final velocity when it hits the ground? (Disregard wind resistance. Round answer to nearest whole number and do
  18. Urgent math

    how do I do this can any body show me how? An arithmetic sequence begins 4, 9, 14, 19, 24, . . . . (a) Find the common difference d for this sequence. d = (b) Find a formula for the nth term an of the sequence. an = (c) Find the 35th term of the sequence.

    A particle has a mass of 5kg. It is held at a height of 3 metres above the ground. Find: a.Its potential energy b.It’s kinetic energy when is hits the ground c.The speed with which the particle hits the ground
  20. physics. urgent answer please

    Two forces 10 N acting in the direction N 30 east and 15 N acting in the eastern direction, if both forces act at a point, find the magnitude and direction of (a) the resultant force (b) the equilibriant force.
  21. URGENT~MATH For Steve or Reiny

    For questions 5-7, find the solution to the system of equations by using either graphing or substitution. 5)y=6-x and y=x-2 (1point) (2,4) (-4,2) (4,2) no solutions 6)y=2x-1 and y=x+3 (1point) (4,7) (7,4) (-7,-4) no solutions 7) y=4x and y+x=5 (1point)
  22. Microeconomics help please (urgent)

    You go to an auction and set a maximum price of $100 you are willing to bid on an item. However, you are fortunate and purchase it for $50. 1) Does the lower price alter the marginal utility you originally placed on the item? 2) Is your potential total

    1. You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l. 2. You have a sample which consists of 428g sodium

    Consider a case in which a 60 kg diver takes off from a diving board located at a height of 10 m above the water level and enters the water at a horizontal distance of 5 m from the end of the board. If the total time that the diver remains in the air is

    A feature article about a plane crash would be more likely than a hard news article to include ? A)the date, time, and location of the crash. B)a profile of one of the survivors of the crash. C)statistics about other crashes involving the same airline.
  26. English

    Can someone please help me urgent. I need to rewrite theses two sentences and eliminate unethical aspects. The service contract...on the whole...applied to upgrades. 2. All our costs were within fair-use guidelines. 1. Upgrades were applied to the service
  27. physics (urgent)

    onsider the following velocity time graph: (I sent a separate link of the picture as it wouldnt allow me to send it in this box) a)Describe the motion of the object from time t_0 to time_1. b)List two pieces of information (other than speeds or velocities)
  28. Precalculus(URGENT)

    solve the problem 2xcubed-17xsquared+31x+20 given that 5 is a zero of f(x)= 2xcubed-17xsquared+31x+20 you can use lobng division or synthetic division
  29. Maths urgent

    a sum of money is invested for 3 years at a certain rate of interest. had the rate of interest been 1% more, it would have fetched rs 18 more than before. find the sum invested?
  30. Math- urgent

    Harry buys American cheese at the deli. He buys 1/4 pound at the cost of x dollars per pound. If he pays $12.25 for 2.5 pounds of cheese, what is the cost per pound? Please show your work.
  31. Urgent math

    The initial size of a culture of bacteria is 1000. After one hour the bacteria count is 4000. (a) Find a function n(t) = n0ert that models the population after t hours. n(t) = b)Find the population after 1.5 hours. (Round your answer to the nearest whole
  32. Accounting

    At December 31, 2007, before any year-end adjustments, Bollis Company's Prepaid Insurance account had a balance of $2,700. It was determined that $1,500 of the Prepaid Insurance had expired. The adjusted balance for Insurance Expense for the year would

    A submarine was floating on the water. It went under the water at a rate of 0.5m/second for 3 minutes. It then started to rise towards the surface at a rate of 0.7m/second for 1.5 minutes. What is the depth of the submarine? The hint my teacher gave me
  34. Math Urgent help please

    A lamppost casts a shadow of a man who is standing 15 feet away from the lamppost. The shadow is 5 feet long. The angle of elevation from the tip of the shadow to the lamp is 50. To the nearest foot, the lamppost is _____ feet tall. (Points : 2)
  35. Calculus - Urgent!!!

    In case this looks familiar, yes, it is a repost. I really need help. Find the anti-derivitive of f(x)= x^3(x-2)^2. Multiple choice gives me the options: A: 1/6 x^6 - 4/5 X^5 + x^4 + C B: 1/6 x^6 - 4/5 X^5 + 1/4 x^4 + C C: x^6 - X^5 + x^4 + C D: x^5 - 4x^4
  36. Spanish Help?? (URGENT)

    Alright for an Spanish assignment I must make skit that talks about family. And I need to roleplay this skit infront of the class. The problem is that in the skit I must teach the class about family members ands their relationship. I need to do this in a
  37. English/ History-Urgent

    Was there a person in history whose personality changed dramatically in his/ her life? Who was he/ she? I did google search but still had no ideas? Can someone please give a name of person who changed dramatically in history? Any help will be appreciated.
  38. math

    1. The x-intercept of a line is -3. The y-intercept of a line is 6. What is the slope of the line? 2. What is the equation in slope-intercept form of the line described in Exercise 1? can you please explain and answer it?? im having lots of trouble with
  39. Urgent : Electricity and Magnetism

    Two charged spheres are kept at a great distance from each other. Sphere A has charge +20q and sphere B has charge -14q. A neutral conducting sphere, sphere X, is then touched upon the sphere A, then sphere B, and X, repectively, after these q(a),q(b) and
  40. urgent help please i have an exam !!

    A light pole of height 15 meter has a lamp hanging at its top . from a distance 12 meter from the base of the pole , a ball is thrown vertically upwards with velocity 5m/sec . find the rate at which the shadow of the ball on the earth moves away from the
  41. chem urgent!

    Set up a Hess's law cycle, and use the following information to calculate ÄH°f for aqueous nitric acid, HNO3(aq). You will need to use fractional coefficients for some equations. 3 NO2(g) + H2O(l) 2 HNO3(aq) + NO(g) ÄH° = -138.4 kJ 2 NO(g) + O2(g) 2
  42. differential equation urgent !

    Driver A had been leading archrival B for a while by a steady 3 miles. Only 2 miles from the finish, driver A ran out of gas and decelerated thereafter at a propertional to the square of his remaining speed. One mile later, driver A's speed was exactly
  43. Bio-URGENT

    OK i did a lab in which we had to calculate the rate of reaction by observing how much gas was produced by the experiment. to do this we used a ubside down graduated cylinder in a tub of water and placed a gas collection tube between the testube and the
  44. Socials urgent

    I need to know the following for these places: Port Moody, Chinatown, Fort Langley (all in british columbia canada) 1. what the area was intially used for (history in late 1800s) 2. what the area is used for today (popular tourist attraction or activites)
  45. Physics - URGENT

    A water balloon is launched at a speed of 23 m/s and an angle of 36 degrees above the horizontal. The water balloon hits a tall building located 20 m from the launch pad. At what height above the ground level will the water balloon hit the building?
  46. Physics URGENT!!!

    A 4.02 kg steel ball strikes a massive wall at 11.8 m/s at an angle of 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle, as shown in the figure below. If the ball is in contact with the wall for 0.174 s, what is the
  47. algebra URGENT HELP

    form a polynomial whose degree and zeros are given. don't expand a) degree 3,zeros,-2,0,4 b)degree 4,zeros, -2 multiplicity 3,1 multiplicity 1 solutions a)p(x)= x(x+2)(x-4) B)p(x) =(x+2)^3(x-1)
  48. English

    I forgot to add these few more things. They are really urgent. Thank you. 1) I told my collegues about the possibility of carrying out a Comenius project on how to write the screenplay and shoot (make) a film. 2) As a matter of fact, they would rather be
  49. Honors Biology - URGENT!!!

    After a biochemical analysis of the victim's tissues, brilliant biologist/criminal investigator J. C. Mickleberry announced his findings: "Contrary to the conclusions of the police, the victim did not suffocate. The electron carriers in his mitochondria
  50. Urgent CALCULUS

    So, I haven't posted in a while...but now I am stummped! Only question I can't get today! A team of students seeks to make a flag representing their commitment to the earth. They will be using a green triangle inscribed in a yellow semi-circle. Find the
  51. Chem Lab Help- Check Urgent

    Suggest another solvent you might use instead of ether. Explain your choice giving the advantages and disadvantages of your choice. I said: Toluene Advantages are: -the vapor pressure of Toluene is less -the freezing point is much lower -low polarity
  52. Urgent Language Arts

    1) Which of the following sentences from "I know Why the Caged bird sings"contains context clues that help you understand the meaning of the word in italics? "Shame" made me want to hide my face.* She didn't " encourage" familiarity. The dress looks
  53. math help plz really urgent

    1. The formula M=log I/S determines the magnitude of an earthquake, where I is the intensity of the earthquake and S is the intensity of a “standard earthquake.” How many times stronger is an earthquake with a magnitude of 8 than an earthquake with a
  54. URGENT 8th Grade Math

    Write a word phrase for the algebraic expression 3x-7. The difference of three times and number x and seven. The difference of seven and three times a number x. Three times a number x fewer than seven.** The quotient of three times a number x and seven.
  55. L.A. Urgent

    During her time in the secret annex, Anne demonstrates that she is a unique and remarkable young person with many dimensions to her character. In an essay, explain what makes Anne a complex character. Include details from The Diary of Anne Frank, Act I and
  56. music urgent!!!!!!!!!!!!

    i need help with annotating a piece of idian bollywood music is there anyone who can help me? xXx uzi xXX hi hi back can can you help me with my music course work that is left before it is complete??? xXx uzi xXx
  57. physics(urgent help)

    a) Find the magnitude of the electrostatic force between 2 negative charges separated by a distance of 1augustro. b)what is the magnitude of gravit'l force between the negetive charges (electro)? c) determine the ratio of the gravt'l force and
  58. urgent calculus help please

    A 20m long ladder is leaning against a wall. The top of the ladder is sliding down the wall at a constant speed of 2m/s. How quickly is the bottom of the ladder moving away from the wall when the bottom of the ladder is 5m from the wall? Give your answer
  59. algebra URGENT!

    Solve the system using elimination. 2x – 2y = –8 x + 2y = –1 And this one: Solve the system using elimination. 3x – y = 28 3x + y = 14 Pleease help me :(
  60. urgent math

    Paul is standing on a 39 m high building. The angle of elevation to the top of a taller building is 47 degrees and the angle of depression to the bottom of the same building is 36 degrees. What is the height of the taller building to the nearest tenth. 

    a shopkeeper buys an article at a discount of 15% on the printed price. after charging a sales tax of 5% on the printed price, he sells the article at rs.630. find the profit
  62. Science ...Urgent plz

    Describe, compare and contrast INDUCTION and DEDUCTION as methods of science – using examples where appropriate. Identity and solve a problem using both induction and deduction. Where appropriate illustrated why and how one would use experimentation/
  63. Math Urgent

    1. A hexagonal prism 6ft tall with a regular base measuring 9ft on each and an apothegm of length 7.8ft. 2. A prism 2m tall. The base is trapezoid whose parallel sides measure 7m and 3m. The other sides are each 4m. The altitude of the trapezoid measures
  64. Physics - urgent ; test Monday

    Divers entertain tourists in Punta Cana by diving froma cliff 36 meters above water. Determine the landing speed; ignore air resistance and assume the object starts from rest. I'm supposed to be using kinematics formulas. I tried using d=V(i)t+1/2at^2 and
  65. science-urgent(plz help)!!!!

    a hockey stick has a mechanical advantage of 4. if the effort arm(which is the distance between the fulcrum and your pushing hand-effort)is 25cm long, how long is the stick? if your hand is pushing at a speed of 20km/h, how fast will the puck move?
  66. Quick Question #2 (URGENT)

    How would show/ask 'What is your phone number?' in symbols and pictures. Would having a picture of a telephone and the number sign beside it, and write equal sign then question mark demsonstrate this question? Example: phone pic (#)=? If my idea doesn't
  67. Physics urgent help needed!

    Suppose the position of an object is given by ->r(vector) = (3.0t^2*ihat - 6.0t^3*jhat)m. Where t in seconds. Determine its velocity ->v as a function of time t. Determine its acceleration ->a as a function of time t. Determine ->r at time t =
  68. maths

    really urgent plsss help... the digit at the ten's place of a two digit number is four times that in the unit's place. if the digits are reversed, the new number will be 54 less than the original number. find the original number. check your solution.

    Estimate the product of 1 9/10 and 15. Describe your method. Also,estimate the product of 3 7/8 and 25. Describe your method. Please answer and explain.

    Use implicit differentiation to show that a function defined implicitly by sin x + cos y = 2y has a critical point whenever cos x = 0. Then use the first derivative test to classify those critical numbers that lies in the interval (−2, 2) as
  71. Science urgent help

    A scientist observes that termites are fed a certain antibiotic die a starvation after a few days. The scientist also notices that certain protists that live inside the termites guy are affected by the antibiotic in a peculiar way: although the protists
  72. physics(please help...very urgent.....)

    A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance. i have posted the same question earlier
  73. Economics REALLY URGENT!!!!!

    Hi my assignment is due like TODAY. I need three simple criterion to evaluate whether it is good to buy shares in a company. So far I have the profability of shares, the potential for a share to be blue-chip but I am lacking a third. I'm stuck because I
  74. Calculus urgent

    For the intergral of -(x^2)/3 +6 interval [0,3] Rewrite it as a function of n using the right hand endpoint without any summation sign. can anyone help me start this problem out? I noticed somebody else had that post before, perhaps it was you. I am not
  75. Urgent Math

    A large rectangle is divided into 4 non-overlapping smaller rectangles by two lines. One line is parallel to the base, and the other line is parallel to the height. If the areas of three of the small rectangles are 18,24, and 40, compute the only possible
  76. I.Q QUESTION (Urgent)

    Can u help me out on the question below please. Would you rather a crocodile attack you or an alligator? I'd rather have it attack an alligator. Definitely certain crocs are more dangerous.
  77. math- urgent help

    For the following scenario, develop an equation and a set of 5 ordered pairs for equation: 1. the amount a sales person earns is a flat rate plus commission. 2. the volume of fuel in a snowmobiles tank related the distance travelled. 3. the cost of a hotel
  78. Physics

    Urgent. A density bottle weigh 0.25 when empty and 0. 75 when. Filled with water and 0.65N when filled with alcohol calculate the volume of water,the density of alcohol. Take density of water=1000kg/m3 acceleration due to gravity= 10m/s
  79. Math Quadratic Equations . URGENT!!!!

    A toy rocket is launched form a 3m platform, at 8.2m/s. The height of the rocket is modelled by the equation h=-4.9t^2+8.1t+3 where h is the height, in metres, above the ground and t is the time, in seconds. After how many seconds will the rocket rise to a
  80. statistics

    I have done an entire project based on football scores from a certain team over the last 3 years and I'm not sure what information I can get from my answers. Ive done a frequency distribution table, Ogive, Histogram,cumulative frequency table, frequency
  81. VERY URGENT!!!

    Large numbers of people have moved from rural areas to urban areas in Asia, Africa, and Latin America because (1 point) they want to live life at a slower pace. there are often few jobs and a shortage of land to farm in the countryside. conditions in large
  82. maths-urgent

    a metal block of length 4cm ,breadth 3cm and height 2.5 weighs 500g.what is the mass of a block of length 5cm,breadth 4cm made of the same metal.
  83. Science(Urgent)

    1) How much more energy is released in a 5.0 magnitude earthquake than a 4.0 magnitude earthquake. I know that each unit of Richter magnitude equates to roughly a 32-fold energy increase and that the amplitude has a tenfold increase but I am still confused
  84. Math algebra (urgent!) help me! Thanks a lot!! (;

    Mr lol bought x oranges for $30 and sold them at a profit of 5cents per orange. Write down the (i)cost price of an orange. (ii)the selling price of an orange When he had sold all except 20 of the oranges, he found he had received $28. (iii) form an
  85. Urgent english help

    I'm writing an English persuasive essay and I'm wanting to put a quote from a person as the thesis. How would I quote it? Do I quote it then put the name of person in parentheses? Please help me thanks!
  86. math URGENT HELP!!!

    The area of the base of the regular quadrilateral pyramid is 36 cm2 and the area of a lateral face is 48 cm2. Find: Lateral area of the pyramid
  87. math URGENT!!!!

    the midpoints of the sides of a triangle are (1,1),(4,3),and (3,5). find the area of the triangle. please answer and show how u did it step by step please!!!! how do i find area of the smaller triangle?
  88. Biology---Urgent!

    s this the correct way to cite a source using parenthetical documentation in my research paper? After millions of years the deposits end up in rock and sediment where oil is trapped in small places. Natural gas is a gaseous fossil fuel that is versatile
  89. English... Urgent

    Hi this is a mystery problem can you solve this? The best forger of all time was indeed a most brilliant artist and a man respected and sought after in the criminal world. One day he was asked to copy $50 notes but the police searched his premises before
  90. english

    this is a scene of the book Dawn Bosco's on her way to summer camp. She can't wait for the fun to begin, but when her shell mirror and a favorite pin disappear, it's time for the Polka Dot Private Eye to investigate. can you tell haiku poem for this scene

    The Lantern Festival is a unique Chinese cultural tradition that includes aspects such as fancy lanterns, watching the Lion Dance, and eating tangyuan. I wrote this thesis statement at the beginning of a paper I wrote about the Chinese Lantern Festival.
  92. maths(urgent....please...)

    1) A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance. i have posted the same question
  93. Math-Urgent please

    Healthy food Inc sells 50lb bags of grapes to the military for $10 a bag. The fixed costs of this operation are $80,000 while the variable costs of the grapes are $10 per lb. Calculate the profit or loss on 12,000 bags and on 25,000 bags. Can you please
  94. Trig (Last URGENT)

    sin2x+cosx=0 , [-180,180) = 2sinxcosx+cosx=0 = cosx(2sinx+1)=0 cosx=0 x1=cos^-1(0) x1=90 x2=360-90 x2=270 270 doesn't fit in [-180,180) what do I do? Or maybe I did something wrong. sinx=1/2 x1=sin^-1(1/2) x1=30 x2=180-30 x2=150 is this correct? Please and
  95. Chem Uni. Urgent!!!

    Have to find theoretical yield of recrystallization of acetanilide from water. 1 gram of crude product used (85% acetanilide, 14% Sodium chloride and 1% charcoal) I got 0.50 grams of purified product. With percent recovery of : (0.50g/1.00g)* 100% = 50%.
  96. Physics urgent pls!

    A ball is tossed from an upper-storey window of a building.The ball is given an initial velocity of 8 m/s at an angle of 20 degrees below the strikes the ground 3s later .(a) How far horizontally from the base of the building does the ball
  97. Chem URGENT!!

    Which bond is most polar? F-Cl O-P O-S F-F Si-O Which species has the shortest carbon/oxygen bond? carbon monoxide carbon dioxide carbonate anion all carbon/oxygen bonds have same length Plz Help me with this....I need to see if I answered it right I put
  98. math-urgent

    A ball with a mass 0.15kg is thrown upward with an initial velocity 20m/s from the roof of a building 30m high. Neglect air resistance. Find the max height above the ground that the ball reaches. Assuming the ball misses the building find the time that it
  99. maths urgent please

    A vessel is being filled at a variable and the volume of liquid in the vessel at any time t is given by V = A( 1- e^-kt) V a) Show that dV/dt = k(A-V) b) if one quarter of the vessel is filled in 5 minutes, what fraction is filled in the next 5 minutes? c)
  100. Math (Need help Urgent)

    1. Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 . If the path of the