Popular questions and responses by Sophie
  1. Chemistry

    Write the formula for a complex formed between Ni 2+ and NH3, with a coordination number of 5. Write the formula for a complex formed between Ni 2+ and CN–, with a coordination number of 4. I am having trouble with these problem because I don't really

    asked on June 1, 2014
  2. Health

    A _________ is a substance the body needs in order to grow and function properly. A. metabolism B. diet C. nutrient D. calorie I think it is calorie

    asked on September 24, 2018
  3. chemistry

    Where possible, classify these systems as reactant-favored or product-favored at 298 K. If the direction cannot be determined from the information given, classify the reaction as "Insufficient information". a)2A(g) + 3B(g) -->4C(g) delta H = -95kJ b)2A(g)

    asked on April 20, 2014
  4. Chemistry

    Consider a fuel cell that uses the reaction of ethanol with oxygen to produce electricity, CH3CH20H(l)+ 3O2(g)---> 2CO2(g)+3H2O Use thermodynamic data to determine the value of E°cell for this cell at 25 °C. I don't really know where to start. I got the

    asked on May 5, 2014
  5. social studies

    What was unique about priests in Sumerian society? A. They were not allowed to farm. B. They were females chosen from an early age. C. They were the only ones who could communicate with the gods. D. They were responsible for the Sumerian advancements in

    asked on October 8, 2018
  6. english

    17. Identify the choice that correctly completes the sentence: Neither Kurt nor Sue has turned in _______ permission form. their his or her his they're

    asked on April 10, 2015
  7. Math

    In the scale drawing below each side is .38 cm long. Use the scale factor 1cm=6.5m. What is the perimeter of the actual object?

    asked on December 5, 2018
  8. Language Arts

    If there is a SMATTERING of applause at the end of a play, what do you hear? A. just a few people clapping** B. total silence C. half the audience cheering D. everyone clapping loudly

    asked on March 2, 2016
  9. Math

    The price of a calculator is $12.50. The sales tax is 7.5%. How much will you pay for the calculator?

    asked on December 19, 2018
  10. Spanish

    Where did the dominoes originate before spreading throughout the Spanish-speaking world? A. Miami B. México and Cuba C. The United States D. Spain I think the answer is D

    asked on September 25, 2018
  11. Math

    The supply function for a product is 2p-q-10=0, while the the demand function for the same product is (p+10)(q+30) = 7200. Find the market equilibrium point. .. I think q=656.6667 and p= 333.33335 I think D must = S... but I don't know how do do that.

    asked on January 9, 2017
  12. Math

    The graph below models the value of a $20,000 car t years after it was purchased. Which statement best describes why the value of the car is a function of the number of years since it was purchased? A: Each car value, y, is associated with exactly one

    asked on September 11, 2019
  13. Math

    The Smith family drinks 1 4/5 liters of apple juice each day. The apple juice is packed in 2-liter bottles. How many bottles does Mrs. Smith need to buy every week?

    asked on April 10, 2015
  14. Math

    A flowerbed is 3 3/4 meters long and 2 meters wide. Uncle James wants to build a border around the flowerbed. The width of the border is 1/2 meter. The cost of building the border is $20 per square meter. How much does Uncle James have to pay to have the

    asked on April 10, 2015
  15. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Zn2 ] = 0.842 M and [Ni2 ] = 0.0100 M. Standard reduction potentials can be found here. reaction: Zn(s)+Ni^2+(aq)--->Zn^2+(aq)+Ni(s) standard reduction Zn: -.76

    asked on May 4, 2014
  16. algebra

    In a basketball game, a regular basket was worth 2 points and a long-distance basket was worth 3 points. If there were 45 baskets in a game and 96 points total, how many regular baskets r and long-distance baskets l were made? Show the correct system of

    asked on December 21, 2012
  17. Chemistry

    The density of carbon in the form of diamonds is 3.51 g/cm^3. If you have a 40- carat spherical diamond, what is the diameter of the diamond in millimeters? (1 carat=0.200 g)

    asked on March 7, 2013
  18. algebra

    You decide to market your own custom computer software. You must invest $3,255 for computer hardware, and spend $2.90 to buy and package each disk. If each program sells for $13.75, how many copies must you sell to break even?

    asked on December 21, 2012
  19. Social Studies

    Why did settlers in North Carolina begin to move inland over time?

    asked on September 5, 2019
  20. Math

    Puppy A is 3/4 as heavy as puppy B. Puppy C is twice as heavy as puppy A. If the weight of puppy B is 8 pounds, find the weight of puppy C.

    asked on April 10, 2015
  21. Math Data Management

    In how many ways can the 12 members of a volleyball team line up, if the captain and assistsant captain must remain together? Thank you in advance.

    asked on September 21, 2009
  22. physics

    There are four coils of wire being used as electromagnets. They all have the same size and are made up of the same material but have a different number of loops. Which coil will produce a magnetic field with the maximum strength when the same amount of

    asked on April 13, 2009
  23. physics

    a crate is pushed to the top of a frictionless inclined plane 15 m long with a force of 25 N. If the crate weighs 125 N, how high is the inclined plane? 0.5 m 1 m 3 m or 5 m

    asked on February 19, 2011
  24. physics

    A negatively charged balloon sticks to a wooden door. However, an uncharged balloon does not stick to a wooden door. What is the nature of the charge on the wooden door? A. Electrically neutral B. Positively charged C. Conductor D. Lacking protons I am

    asked on April 7, 2009
  25. Physics!!

    A car moving at 16.0 m/s, passes an observer while its horn is pressed. Find the difference between the frequencies of sound heard when the car approaches and when it recedes from the stationary observer. The velocity of sound is 343 m/s and the frequency

    asked on April 4, 2009
  26. Business Math

    If $4000 is deposited at the end of each year in an account that earns 6.2% compounded semiannually, how long will it be before the account contains $120,000?

    asked on January 6, 2017
  27. Math

    Find the ordered pair that represents the vector from A(-4.3,-0.9) to B(-2.8,0.2)? Then find the magnitude of AB. A. (1.5,1.1); 3.46 B. (-7.1, -0.7); 7.13 C. (1.5, 1.1); 1.86 D.(-7.1, -1.1); 7.18 I got C, is this right?

    asked on June 2, 2009
  28. Career. 8th PLZ GIVE ANSWERRS

    1. You need a college degree to enter the military True False 2. Which of the following is an elected office? lawyer police officer paramedic state representative 3. All people in government or public administration are elected. True Flase 4. Inspectors

    asked on September 19, 2018
  29. chemistry, science

    Carbon is also removed from the atmosphere during the process of weathering. carbon dioxide combines with water to form carbonic acid. this reacts with calcium silicate (in rocks) to produce calcium ions, bicarbonate ions and silicon dioxide (silica) the

    asked on November 2, 2009
  30. AP CHEM

    A bar of strontium metal is immersed in a 1.0 M copper(ll) nitrate solution. write the net ionic. I have the molecular formula written out but im not sure how to write the net ionic for this single displacement reaction

    asked on September 18, 2016
  31. math help?!

    If x = 6sinθ, use trigonometric substitution to write square root 36-x^2 as a trigonometric function of θ, where where 0

    asked on July 11, 2016
  32. Chemistry

    separate this redox reaction into its component half-reactions. O2 + 4Cu-->2CuO Oxidation half-reaction: ? Reduction half-reaction: ? I believe that the Oxidation is copper and that reduction is oxygen. So I tried to write it as 4Cu^+ --> 4Cu + 4e^- O2^2-

    asked on April 28, 2014
  33. Social Studies

    Which statements best describe the effects of the War of Regulation? Check all that apply. Regulators succeeded in forcing the government to hold elections. Many Regulators fled to Kentucky and Tennessee.**** The war discouraged other groups from rebelling

    asked on October 3, 2019
  34. physics

    A 5.0-cm real object is placed at a distance of 30.0 cm from a concave mirror of focal length 10.0 cm. Find the location of the image. A. 6 cm B. 10 cm C. 15 cm D. 60 cm Is it B. 10 cm? Which of the following objects can set fire to a piece of paper in the

    asked on April 6, 2009
  35. Physics

    An electromagnetic wave has a wavelength of 6.2 x 10^14 m. What is the frequency of the wave? A. 2.0 x 10^6 Hz B. 4.8 x 10^-7 Hz C. 1.8 x 10^24 Hz D. 5.3 x 10^-22 Hz I got B..? When the currents in two parallel metal conductors are in the same direction,

    asked on April 11, 2009
  36. General Chemistry

    Question 1: In the Balmer-Rydberg equation, what value of m is used to determine the wavelengths of the Balmer series? m=? Question 2: List a possible set of four quantum numbers (n,l,ml,ms) in order, for the highest energy electron in gallium,Ga.

    asked on October 25, 2009
  37. Math

    Four subtracted from 3 times a number is 29. Find the number

    asked on January 29, 2017
  38. Engineering

    A perfect coin should produce heads and tails with equal probability. If we assign the number 0 toheads and the number 1 to tails, then we can mimic such a perfect coin in Matlab. Specifically, we cangenerate N “coin flips” in Matlab by doing x=

    asked on February 17, 2016
  39. Math

    Which of these tables represents a linear function? A: 3,3 4,4 5,6 6,7 B: 3,6*** 4,5 5,4 6,3 C: 3,7 4,6 5,5 6,5 D: 3,2 4,4 5,5 6,6

    asked on September 11, 2019
  40. Physics: true or false

    1. In a gas kept at a constant temperature, all molecules move with the same speed. A. True B. False 2. A hot object has more thermal energy than a similar cold object only because of greater kinetic energy. A. True B. False 3. The thermal energy of the

    asked on April 3, 2009
  41. Physics

    Which of the following statements is true about electric forces? A. Electric forces cause objects to only attract each other. B. Electric forces cause objects to only repel each other. C. Electric forces cause objects to repel or attract each other. D.

    asked on April 7, 2009
  42. physics

    A large 63.0kg board is propped at a 44 degree angle against the edge of a barn door that is 2.5 m wide. How great a horizontal force must a person behind the door exert (at the edge) in order to open it? Assume that the coefficient of friction between the

    asked on May 16, 2012
  43. Math

    Student answers 75​% of the questions on a math exam correctly. If he answers 30 questions​ correctly, how many questions are on the​ exam?

    asked on December 15, 2018
  44. Algebra

    You need to rent a moving truck for two days. Rider Moving Trucks charges $50 per day and $.50 per mile. UMove Trucks charges $45 per day and $0.75 per mile. Write an equation describing each situation. Graph them on the same xy axis. You only need

    asked on February 22, 2017
  45. Chemistry 104 PLEASE HELP ME!!

    Determine the weight of Na2C2O4 which is required to react completely with 20.0ml of 0.02M KMnO4.

    asked on May 5, 2013
  46. ap chemistry

    Which of the following rate laws is possible for the following two-step reaction? 1) NO(g) + NO(g) N2O2(g); FAST 2) N2O2(g) + O2(g) 2NO2(g); SLOW Net: 2NO(g) + O2(g) 2NO2(g); A. k[N2O2][NO] B. k[NO]2 C. k[N2O2][O2] D. k[NO][O2] help!!!!! i don't know how

    asked on March 5, 2018
  47. science

    suppose you are pulling a wagon with the handle at an angle. How can you make your task easier?

    asked on November 15, 2009
  48. physics

    carol and bruno drag a box of mass 58.0 kg along a frictionless floor. Carol pushes the box with a force of 11.4 N at an angle of 40.0 downward from the horizontal. Bruno pulls the box from the other side with a force of 11.0 N at an angle of 40.0 above

    asked on April 3, 2009
  49. physics: true or false

    A concave mirror of focal length 10 cm forms an upright and diminished image of a real object placed at a distance of 5 cm from the mirror. A. True B. False A convex lens is used to obtain an enlarged virtual image. A. True B. False Not too sure on the

    asked on April 6, 2009
  50. math, physics

    A motorboat goes upstream on a river and covers the distance between two towns on the riverbank in 6 hours. It covers this distance downstream in 5 hours. If the speed of the stream is 1.5 km/h, find the speed of the boat in still water. [This problem is

    asked on November 10, 2015
  51. Physics

    Two capacitors are identical, except that one is empty and the other is filled with a dielectric (k = 3.9). The empty capacitor is connected to a 17 -V battery. What must be the potential difference across the plates of the capacitor filled with a

    asked on September 26, 2019
  52. Language Arts

    where do you look up context clues to the meaning of a word

    asked on March 2, 2015
  53. History

    Why do I have to take History in 6th Grade

    asked on October 2, 2019
  54. Social Studies

    "How was the free-trade trial of 1849 a victory for the Metis?" Was it because the 4 Metis offenders were given mercy and it also ended the HBC monopoly?

    asked on January 13, 2013
  55. math

    What is the distance between the parallel planes: ax+by+cz=d1 and ax+by+cz=d2?

    asked on May 22, 2011
  56. Math

    Lily uses 1 3/4 of ribbon to make a knot. She wants to make 9 similar knots for her cousins. How many meters of ribbon does Lily need? Round your answer to the nearest meter.

    asked on April 10, 2015
  57. CHemistry

    Assuming the final concentration of chloride anion after the addition of HCl (precipitation step) was 0.1M, what is the remaining concentration of Ag+ in the solution? (pKsp for AgCl = 9.74)

    asked on October 11, 2014
  58. Physics

    What must be the minimum height of a plane mirror so that a boy of height 162 cm can view himself from head to toe? A. 40.5 cm B. 81 cm C. 162 cm D. 324 cm It would be B. 81 cm?

    asked on April 5, 2009
  59. Social Studies

    The end of the trans-Atlantic slave trade resulted in A. a decrease in money going to African kingdoms.*** B. payment from the Americas to Africa. C. Africa owing money to American slaveholders. D. an increase of European goods in Africa.

    asked on September 19, 2019
  60. AP Chemistry

    The reaction of the molecules to produce ethane is C2H4(g) + H2(g) → C2H6(g). A mechanism for this reaction is shown below: (The figures show how the ethene molecule with two hydrogen molecules attached 'binds' to

    asked on April 1, 2018
  61. social studies

    why did the us want to build a canal across panama 2 how did the us gain control of the panama canal zone 3 how did the people of panama feel about us control of the canal zone why 4 what agreement did the us make with panama in 1977 5 what are the

    asked on November 9, 2009
  62. physics

    a ball is thrown upward from a bridge with a speed of 48 ft/s. It misses the bridge on way down and lands in water 160 ft. below. Find how long the ball rises, how high it goes, how long it is in the air, and its velocity when it strikes the water?

    asked on March 3, 2019
  63. math please hurry

    A secret code must consist of three capital letters followed by a digit. Letters cannot be repeated. How many secret codes are possible? A. 140,400 B. 156,000 C. 175,760 D. 358,800

    asked on May 19, 2013
  64. science

    as you push a lawnmower the horizontal force is 300 N. If you push the mower a distance of 500 m, how much work do you do?

    asked on November 16, 2009
  65. chemistry

    how many grams of copper hydroxide can b prepared from 2.7g of copper (II) nitrate and excess sodium hydroxide?

    asked on March 23, 2010
  66. maths

    How do I draw a 64 degree angle in between a 6cm by 5cm triangle please

    asked on June 12, 2015
  67. Chemistry

    The ph of a solution is 9.55 at 25degree celcius. What is the hydroxide-ion in the solution?

    asked on April 2, 2015
  68. Physics GR12

    A bungee jumper of mass 75kg is stadnding on a platform 53m above a river. The length of the unstretched bungee cord is 11m. The spring costant is 65.6N/m. Calculate the jumper's speed at 19m below the platform on his first fall. [Also, please state which

    asked on December 4, 2013
  69. Physics!!!

    When does a magnetic field induce maximum EMF in a wire moving with a constant velocity? A. When the wire is moved at an angle of 60 degrees to the direction of the magnetic field B. When the wire is moved at right angles to the magnetic field C, When the

    asked on April 12, 2009
  70. math please help?! studying for test!!

    If x = 9tanθ, use trigonometric substitution to write square root 81 + x^2 as a trigonometric function of θ, where -pi/2 < θ < pi/2

    asked on July 11, 2016
  71. Chemistry

    The solubility of benzoic acid in water is 2.56g in 100cm3 at 79 C and 0.29g in 100cm3 at 20 C. What is the minimum volume of water in which 1g of benzoic acid can be dissolved at 79 C? I set up a dimensional analysis but since the question gives 2 sets of

    asked on June 25, 2008
  72. math

    In triangle ABC, a=7.8, b=4.2, c=3.9. Find B a. 15.1° b. 148.7° c. 78.9° d. 16.2 ° It is D, right?

    asked on May 28, 2009
  73. Physics

    The polarity of an electromagnet can be determined using the second right-hand rule. A. True B. False Is it B? Current passing through a conductor is increased from 10 A to 15 A. This decreases the strength of the magnetic field produced by the conductor.

    asked on April 13, 2009
  74. Global Village

    How have humans modified and adapted to the environment in Angola, Africa?

    asked on November 30, 2017
  75. Math

    Find the exact value of the trig function below. cos2Ø if sinØ = 2/5

    asked on March 19, 2017
  76. chemistry please help

    what is wrong with these names?provide the correct name for each. i.2-Dimethylpentane {4] ii.2-Ethylpentane {4} iii.5,5-Dimethyl-3-ethylhexane {4]

    asked on February 11, 2017
  77. English- Medieval Period

    This refers to Sir Gawain and the Green Knight Gawain's actions at the castle reveal that the knight's moral code values: a. strength b. courage c. loyalty d. NONE OF THE ABOVE I put B, I am not sure though.... ???

    asked on April 23, 2009
  78. Physics

    I push a stack of six books (each weighting 4 kg) horizontally across a table to the right with a kinetic coefficient of friction uk = 0.5. I apply a force of 120 N. a) What is the acceleration of the books? b) what is the force of the rightmost book on

    asked on July 11, 2014
  79. spanish 6th grade

    how do you say what is your favorite food in spanish

    asked on November 1, 2010
  80. Math

    Write an equation in slope-intercept form of the line whose parametric equations are: x = (1/2)t +2/3 and y = t - 3/4. a) y = 2x - 7/12 b) y = 2x + 7/12 c) y = -2x - 7/12 d) y = -2x - 25/12 I think it is D.....?

    asked on June 3, 2009
  81. Chemistry

    How many grams of magnesium nitride are formed from 45.1 moles of magnesium?

    asked on April 16, 2013
  82. science

    a libraian lifts a box of books that weighs 93 N a distance of 1.5 m. How much work does he do?

    asked on November 16, 2009
  83. Physics: true or false

    A convex mirror forms a virtual, diminished, and upright image for all real objects regardless of the location of the object. A. True B. False Is it true? A convex mirror of focal length 10 cm forms an upright and magnified image of a real object places at

    asked on April 5, 2009
  84. polarity

    could you put these in order of polarity please: fluorenone, fluorenol and fluorene. Thanks

    asked on January 1, 2008
  85. Geometry

    How do you find the angle of FAC when: D is in the interior of

    asked on October 16, 2006
  86. algebra

    a store buys jeans for $24 each and marks them up 30%. what is the selling price of a pair of jeans?

    asked on August 8, 2013
  87. Physics

    A bullet is fired straight up from a gun with a muzzle velocity of 148 m/s. Neglecting air resistance, what will be its displacement after 6.3 s? The acceleration of gravity is 9.8 m/s2 .

    asked on October 7, 2012
  88. 10th grade math help

    How do you solve? 3-3sinx-2cos^2(x) = 0

    asked on December 13, 2010
  89. Calulus

    Consider the following function. f(t) = 3t2 − 3 (a) Find the average rate of change of the function below over the interval [3, 3.1]. (b) Compare this average rate of change with the instantaneous rates of change at the endpoints of the interval. (at t =

    asked on October 15, 2010
  90. physics

    When does a magnetic field induce maximum EMF in a wire moving with a constant velocity? A. When the wire is moved at an angle of 60 degrees to the direction of the magnetic field B. When the wire is moved at right angles to the magnetic field C, When the

    asked on April 12, 2009

    When a conducting sphere is charged positively, initially the charge is deposited on the left side. However, due to the sphere's conducting nature, the charge spreads uniformly throughout the surface to the sphere. Charge is uniformly distributed because:

    asked on April 8, 2009
  92. Physics help!

    Heat is added to an open container of a liquid. The liquid is brought to its boiling point and half the liquid boils away. Which of the following graphs shows how the temperature changes with this time period? Would the graph be just an ascending line?

    asked on April 3, 2009
  93. algebra

    What is the solution of the system of equations? y = 3x + 7 y = x – 9

    asked on December 21, 2012
  94. Physics!!

    An electromagnetic wave is produced by: A. an accelerating charged particle or changing magnetic fields B. an accelerating uncharged particle and changing magnetic fields C. a stationary charged particle and a magnetic field D. any moving particle and a

    asked on April 12, 2009
  95. Math - Related Rates

    Air is being pumped into a spherical balloon at a rate of 2 cubic meters per minute. At what rate is the radius changing when the volume of the balloon is 36pi cubic meters?

    asked on February 22, 2017
  96. Physics

    A ball is thrown at 15.5 m/s at 42° above the horizontal. Someone located 30 m away along the line3 of the path starts to run just as the ball is thrown. How fast, and in which direction, must the catcher run to catch the ball at the level from which it

    asked on September 26, 2014
  97. Spanish-Please check SraJMcGin

    Hi, I redid some of the answers as suggested yesterday from someone who responded to my post. Could you please see if I did them correctly-Thank you- I made the corrections-someone yesterday redid a question but the questions shouldn't be redone-that's my

    asked on January 5, 2012
  98. science

    The greatest velocity a falling object reaches is called its what?

    asked on May 6, 2010
  99. Physics

    A current-carrying wire is oriented at right angles to a uniform magnetic field. If the length of the wire is 0.50 m and it experiences a force of 0.90 N while carrying a current of 4.0 A, what is the strength of the magnetic field? I did the work and got:

    asked on April 22, 2009
  100. algebra

    At the Wild Thing Zoo, you can rent a motorized cart to tour the grounds for a $4 initial charge and $4 per hour. An equation that represents the total cost y for x hours is y = 4 + 4x. At Safari Zoo, you can rent the same cart for a $3 initial charge and

    asked on December 21, 2012


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