Most popular questions and responses by sydney
  1. chemistry

    A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution before the addition of any KOH. The Kb of NH3 is 1.8 × 10-5. I thought that I would need a second volume to find the moles of NH3?

    asked on November 6, 2014
  2. statistics

    In a carnival game, a player spins a wheel that stops with the pointer on one (and only one) of three colors. The likelihood of the pointer landing on each color is as follows: 65 percent BLUE, 22 percent RED, and 13 percent GREEN. Note: Your answers

    asked on March 31, 2013
  3. Chemistry

    You are in a mountain range with atmospheric air pressure of 520 , and you wish to boil some eggs. What is the approximate boiling point of the water at this air pressure? Express your answer as an integer and include the appropriate units.

    asked on October 4, 2012
  4. algebra 1

    How many solutions does this system have-2x+y=3 6x=9-3y A. one B. none C. infinite D. two A??

    asked on December 3, 2017
  5. Physics

    A bathysphere used for deep sea exploration has a radius of 1.50 m and a mass of 1.20 × 104 kg. In order to dive, the sphere takes on mass in the form of sea water. a) Determine the mass the bathysphere must take on so that it can descend at a constant

    asked on November 21, 2010
  6. Language Arts

    Could you please help me with these answers, I'm having serious trouble with this. What is the prepositional phrase in this sentence? Late last night there was a loud knock at the door. A. Late last night B. there was C. a loud knock D. at the door What is

    asked on May 9, 2016
  7. Language Arts HELP!!!

    What is the most likely reason that more of the characters in the giver do not act heroically? A. children are taught at an early age that heroes are not welcome in their community. B. IN a community where everything is the same, there is no need for a

    asked on May 19, 2016
  8. Physics... HELP

    A toy car runs off the edge of a table that is 1.225 meters high. If the car lands 0.400 meters from of the table, a. How long does it take for the car to fall? b. What is the horizontal velocity of the car?

    asked on December 12, 2013
  9. L O

    Six suggestions on how to address the examples of the human rights violations

    asked on April 15, 2019
  10. Calculus

    You have just opened a new nightclub, Russ' Techno Pitstop, but are unsure of how high to set the cover charge (entrance fee). One week you charged $9 per guest and averaged 165 guests per night. The next week you charged $10 per guest and averaged 150

    asked on August 29, 2013
  11. Math

    Dori claims that 3.52 is not a rational number because it is not written as a ratio of integers. Is she correct? Explain why or why not.

    asked on September 22, 2016
  12. Physics

    A 90 m long train begins uniform acceleration from rest. The front of the train has a speed of 21 m/s when it passes a railway worker who is standing 184 m from where the front of the train started. What will be the speed of the last car as it passes the

    asked on September 13, 2011
  13. Chemistry

    How mush CaCl2, in grams, is needed to make 2.0 L of a 3.5M solution? g CaCl2 = (2.0L) *( 3.5 mol Cl-/1L) * (1mol CaCl2/ 2mol Cl-) *( 110.98 g CaCl2/ 1 mol CaCl2) = 5.549 g CaCl2 i don't think i did any of this right

    asked on June 23, 2015
  14. Physics

    Suppose two boxes on a frictionless table are connected by a heavy cord of mass 1.0 kg. Calculate the acceleration (magnitude) of each box and the tension (magnitude) at each end of the cored, using the free-body diagrams shown in Figure 4-53. Assume FP =

    asked on October 13, 2011

    A student determined the calorimeter constant of the calorimeter. The student added 50.00 mL of cold water to 50.00 mK of heated , distilled water in a styrofoam cup. The initial temp of the cold water was 21,00C and the hot water, 29.15C. The maximum temp

    asked on March 3, 2010

    A radio signal travels at 3 x 10^8 meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of 3.54 x 10^7?

    asked on April 11, 2016
  17. Chemistry

    A 100 mL sample of 0.10M HCl is mixed with 50mL of 0.10M NH3 (Kb=1.8x10^-5). What is the resulting pH?

    asked on April 12, 2012
  18. english

    consider what you have learned about American history during the period 1860 to the early 1900s. how do the stories in unit 4 reflect what was going on in the country then?

    asked on January 9, 2014
  19. Chemistry

    A 100 mL sample of 0.10M HCl is mixed with 50mL of 0.10M NH3 (Kb=1.8x10^-5). What is the resulting pH?

    asked on April 12, 2012
  20. Social studies

    How has the US economy changed over the past 50 years? I know it used to be mainly farming and manufacturing but now we have expanded on this with medical research technology, and education but I need help expanding this answer

    asked on October 9, 2014
  21. Logarithm

    The rate of auto thefts triples every 6 months. (a) Determine, to two decimal places, the base b for an exponential model y = Ab^t of the rate of auto thefts as a function of time in months. b = (b) Find the doubling time to the nearest tenth of a month.

    asked on September 3, 2013
  22. Chemistry

    A solution is prepared by adding 50ml of 0.050M HCl to 150 ml of 0.10M HNO3. Calculate pH

    asked on May 6, 2019
  23. Science

    A Fisherman in a row boat notices that one wave crest passes his fishing line ever 5 seconds. He estimates the distance between the crests to be 1.5 meters and that the crests of the waves are about .5 meters above the troughs. Using this data, determining

    asked on March 22, 2012
  24. Chemistry

    How many valence electrons are in carbon tetrachloride?

    asked on July 15, 2009
  25. Art HELP PLEASE!! part 2

    Artists make shapes in the backgroud smaller than shapes in the foreground to communicate their distances from the viewer. How else might a landscape artist show shapes in the background to depict their distances from the viewer? A. show shapes with

    asked on April 11, 2016
  26. French - Excerise on Passe Compose

    Here is another writing prompt which basically focuses on the Passe Compose. Using the irregular verbs --Avoir, Etre. Here are the instructions: You are spending six months in Paris studying at a specific language school. Write your French teacher a letter

    asked on April 14, 2011
  27. Geometry

    Given that ABC XYZ, mA = 40, and mC = 55, find mY.

    asked on October 19, 2011
  28. Language Arts

    In which sentence is a pronoun used as a direct object? A. The stars of the play were Pablo and me. B. My dad gave me his old watch. C. Nan invited my sister and I to her party. D. Ask me no more questions, please

    asked on February 20, 2016
  29. Alg/Trig

    If h= -16t^2 + 112t represents the height of a​ rocket, in​ feet, t seconds after it was​ fired, when will the rocket hit the​ ground? (Hint: The rocket is on the ground when h equals=​0).

    asked on February 5, 2017
  30. Math-SineLaw

    Fire lookout towers are used to locate fires so they can be put out as soon as possible. These towers often work in networks and if two towers can see a fire at the same time, they can determine the location of the fire vey accurately. A.) Two forest

    asked on June 5, 2016
  31. Ap US History

    Why would former slaves and Radical Republicans describe the state of affairs following the Compromise of 1877 as “worse than slavery”? Support, refute, or modify this claim using historical evidence. i just need help starting this paper and i also

    asked on January 31, 2016
  32. English check

    Which principal part of the verb to teach appears in this sentence. Then she taught me how to cultivate rich and healthy soil and helped me identify which types of plants are best for the environment in my yard. past past participle present present

    asked on October 5, 2014
  33. Physics

    A shell is fired from the ground with an initial speed of 1.68 103 m/s at an initial angle of 37° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range. m (b) Find the amount of time the shell is in motion. s

    asked on October 5, 2011
  34. pre-cal

    I have 2 sets of coordinates (1, 410) and (12, 788) and need to calculate the rate of change over time using y=ae^bt. Since I don't have a coordinate at 0, I can't figure out how to calculate my starting value, or a, to solve this.

    asked on December 19, 2018
  35. Language Arts

    Identify the indirect object in the following sentence. Mom needs to give us money before we leave. A. mom B. us C. we D. leave I think it' C, am I right?

    asked on March 15, 2016
  36. Chemistry

    what is the molarity of a solution of the strong base Ca(OH)2 in a solution that has a pH of 10.80?

    asked on April 12, 2012
  37. Algebra 1

    HELP ME!!! write each polynomial in standard form 1. 4r + 3 - 9r^2 +7r 2. 10x^2+8-6x-10x^2 Simplify each polynomial. Write each in standard form. HINT: Watch for the operation! Add? Subtract? Or Multiply? 3. (2v^3-v+8)+(-v^3+v-3) 4.

    asked on April 30, 2019
  38. Language Arts

    what is the meter of line 27? "one by one towns pass by" A. stressed, unstressed, stressed, unstressed, stressed, unstressed, stressed b. unstressed, stressed, unstressed, stressed, unstressed, stressed, unstressed c. unstressed, unstressed, stressed,

    asked on March 15, 2016
  39. Math 141

    A pair of fair 6-sided dice is rolled. What is the probability that a 3 is rolled if it is known that the sum of the numbers landing uppermost is less than or equal to 6?

    asked on April 8, 2015
  40. Chemistry

    What happens when you dissolve CO2 (g) into NaOH (aq). (explain using net ionic equation)

    asked on March 23, 2019
  41. Rate based Calculus Question help

    Electricity is consumed between the hours of midnight (t = 0) and 6 a.m. (t = 6). Selected values of the rate of consumption are shown in the table below, with t measured in hours past midnight, and R(t) measured in KW per hour. Use 4 trapezoids to

    asked on July 16, 2018
  42. Physics

    Determine the total resistance of each of the following parallel circuits. A. A parallel circuit with a 20-ohm resistor and a 10-ohm resistor. B. A parallel circuit with two 20-ohm resistors and a 10-ohm resistor. C. A parallel circuit with a 15-ohm light

    asked on April 6, 2018
  43. Math- Discrete Functions

    Mary would like to save $10 000 at the end of 5 years for a future down payment on a car. How much should she deposit at the end of each week in a savings account that pays 1.2%/a, compounded monthly, to meet her goal?

    asked on August 25, 2017
  44. physics

    A diver of mass 68.9 kg stands at the end of a diving board of mass 24.5 kg and length L = 3.29 m. The diving board is supported at two locations, labeled A and B on the diagram. A and B are separated by a distance d = 0.74 m. Observe normal sign

    asked on January 19, 2011
  45. Physics

    Two children are playing on two trampolines. The first child can bounce 1.6 times higher than the second child. The initial speed up of the second child is 5.2 m/s. (a) Find the maximum height the second child reaches. (b) What is the initial speed of the

    asked on September 14, 2011
  46. Cylinder Height

    A cylinder has surface area of 402 cm2. The height is three times greater than the radius. What is the height of the cylinder?

    asked on January 19, 2011
  47. chemistry

    Will you please help me write this equation in net ionic form. I2(s)+Na2S2O3(aq)-->Na2S2O4(aq) +NaI(aq)

    asked on August 25, 2015
  48. Social Studies

    Why is diplomacy a key part of U.S. foreign policy? Because it helps prevent wars and helps countries settle issues and work together I really don't know

    asked on October 9, 2014
  49. chem:ionic equations

    write below the complete ionic equation for the reaction of magnesium phosphate with lead(II)nitrate. Include which ions will be aqueous and which compound will precipitate. I understand how to balance the equation, but the example they give me is

    asked on November 27, 2007
  50. Chemistry

    Calculate the heat released when 64.5g of steam at 119 C is converted to water at 36 C. Assume the specific heat is 4.184 J/g*C for water, the specific heat of steam is 1.99J/g*C, and the heat of vaporization is 40.79 kJ/mol for water.

    asked on June 17, 2011
  51. Chemistry

    Consider this reaction: Fe3O4(s)+4CO(g) --> 4CO2(g)+3Fe(s). If you begin with 0.03820 moles of iron oxide and 0.120 moles of carbon monoxide, how many grams of iron can be formed? Indicate which reactant is the limiting reactant. 0.03820 x 3/1= 0.1146

    asked on May 29, 2017
  52. poetry

    what's the significance of the poet's structure and style choice in the poem Dover Beach?

    asked on October 23, 2016
  53. Chemistry

    An aqueous solution that 2.00 M in AgNO3 is slowly added from a buret to an aqueous solution that is 1.00×10−2 M in Cl− and 0.260 M in I−. When the second ion begins to precipitate, what is the remaining concentration of the first ion? I know that

    asked on June 5, 2016
  54. physics. HELP

    Phil jumps off a high-diving platform with a horizontal velocity if 2.8 m/s and lands in the water 2.6 seconds later. a. How high is the platform b. How far out from where he jumped does he land?

    asked on December 12, 2013
  55. Math (Algebra)

    3 robots go out to lunch. They decide to share the $11.91 bill evenly. How much does each robot pay? Equation: 3x = 11.91 #1. What does x represent? #2. Solve for x. #3. Answer the question.

    asked on May 6, 2013
  56. Chemistry

    Can you please help me write the oxidation and reduction half reactions represented in each of these redox equations, and help me write the half reactions in net ionic form if they occur in aqueous solution. 1) PbO(s) + NH3(g) --> N2(g) + H2O(l) + Pb(s) 2)

    asked on August 24, 2015
  57. physics

    An athlete executing a long jump, leaves the ground at a 30 degree angle with the ground and travels 8.90 meters horizontally in 1.1 seconds. What was the takeoff speed of the athlete along the diagonal?

    asked on December 16, 2013
  58. physics

    A dart player throws a dart horizontally at a speed of of 12.4 m/s. The dart hits the board 0.32 meters below the height from which it was thrown. How far away is the player from the board?

    asked on December 12, 2013
  59. Math

    An airplane is flying 100 km north and 185 km west of an airport. It is flying at a height of 7 km A) what is the straight long distance to the airport? B) what is the angle of elevation of the airplane, from the point of view of the airport?

    asked on June 15, 2016
  60. College Physics

    Col. John Stapp led the U.S. Air Force Aero Medical Laboratory's research into the effects of higher accelerations. On Stapp's final sled run, the sled reached a speed of 284.4 m/s (632 mi/h) and then stopped with the aid of water brakes in 1.4 s. Stapp

    asked on October 6, 2014
  61. physics

    An ethernet cable is 3.95 m long and has a mass of 0.190 kg. A transverse pulse is produced by plucking one end of the taut cable. The pulse makes four trips down and back along the cable in 0.820 s. What is the tension in the cable?

    asked on February 20, 2013
  62. algebra

    Mary drove from Amity to Belleville at a speed of 50 mi/h. On the way back, she drove at 60 mi/h. The total trip took 4(2/5)h of driving time. Find the distance between there two cities

    asked on December 19, 2011
  63. Chemistry

    What happens to the mass of a beaker of water with a teaspoon of sugar in it measured on a balance pan compared to a teaspoon of sugar and a beaker of water separated on a balance pan? does the mass increase, decrease or stay the same? and why?

    asked on January 18, 2011
  64. physics

    The x component of a certain vector is -86.0 units and the y component is +75.0 units. The magnitude of the vector is 114 m. What is the angle between the direction of the vector and the positive direction of x? Use the convention that positive angles are

    asked on October 24, 2010
  65. Chemistry

    Can you please explain to me how you would regulate the pressure to favor the products in the this equilibrium system. MgCO3(s)-->

    asked on August 11, 2015
  66. physics

    A uniform ladder of mass m and length L leans at an angle θ against a frictionless wall. If the coefficient of static friction between the ladder and the ground is 0.43, what is the minimum angle at which the ladder will not slip? Do i use the equation

    asked on January 17, 2011
  67. physics

    A ship maneuvers to within 2500m of an island's 1800m high mountain peak and fires a projectile at an enemy ship 610m on the other side of the peak. If the ship shoots the projectile with an initial velocity of 250m/s at an angle of 75 degrees. how close

    asked on October 8, 2010
  68. Math/Algebra

    The function T(x)=0.25(x-4400)+440 represents the tax bill T of a single person whose adjusted gross income is x dollars for income between ​$4400 and ​$17,600 inclusive. ​(a) What is the implied domain of the linear​ function? ​(b) What is a

    asked on March 5, 2017
  69. FRENCH

    1. Quelles corvées est-ce que tu dois faire chez toi? Je dois faire la vaiselle, passer l'aspirateur, et sort la poubelle chez moi. 2. Quelles corvées est-ce que tu n'aimes pas du tout faire? Les corvées je n'aime pas du tout faire sont: changer mes

    asked on May 31, 2011
  70. Chemistry

    At what temperature will 1.05 g of argon gas exert a pressure of 1.03 atm in a 5.21 L container?

    asked on May 20, 2019
  71. Algebra

    HELP ME IM DESPERATE! write this polynomial in standard form 10x^2+8-6x-10x^2 Simplify each polynomial. Write each in standard form. HINT: Watch for the operation! Add? Subtract? Or Multiply? 3. (2v^3-v+8)+(-v^3+v-3)

    asked on May 8, 2019
  72. Geography

    conduct research to examine the sphere of influence of an organisation that renders a service in a community,hospital,a local high school

    asked on July 25, 2011
  73. Math

    Use the addition property​ and/or the multiplication properties to find a and b. If -4

    asked on March 11, 2017
  74. Algebra

    Sally can paint a room in 4 hours while it takes Steve 7 hours to paint the same room. How long would it take them to paint the room if they worked​ together?

    asked on February 22, 2017
  75. AP US History

    Adams was an accomplished patriot who was instrumental in establishing the United States and its government. However, many people believed that the Adams administration was a setback, and that his presidency did more harm than good to the new nation. Was

    asked on October 22, 2015
  76. math

    greg exchanged 200 canadian dollars for 1/5 fewer u.s dollars. after spending 3/4 of the u.s dollars, how many did he have left?

    asked on January 26, 2011
  77. Physics

    The general relationship of oscillation T of a mass m suspended on a spring is T=2(pie)square root of m/k, where k is the spring constant. how would i change this equation into a straight line equation to graph?

    asked on January 25, 2010
  78. science

    cells are the basic units of structure and function in living organisims ture or false

    asked on May 17, 2008
  79. Chemistry

    A 0.400 gram sample of a substance contains 0.141 g of potassium, 0.115 g of sulfur, and 0.144 g of oxygen. What is the empirical formula for this compound?

    asked on May 20, 2019
  80. Algebra 2

    Pls help me!! I need the answers to these few questions I just cant figure them out and I have to turn them in asap Simplify each polynomial. Write each in standard form. HINT: Watch for the operation! Add? Subtract? Or Multiply? 8. 4m(2m+9m^2-6) 9.

    asked on May 13, 2019
  81. physics. HELP

    An athlete executing a long jump, leaves the ground at a 30 degree angle with the ground and travels 8.90 meters horizontally in 1.1 seconds. What was the takeoff speed of the athlete along the diagonal?

    asked on December 16, 2013
  82. math

    If a prism was filled with 43 cubes with half unit side lengths. what is the volume of the prism in cubic units?

    asked on April 22, 2013
  83. Chemistry

    Aluminum and oxygen are mixed together to yield aluminum oxide. If 3.17 g of Al are used, how many g of product can be made? Al+ O2 yields Al2O3

    asked on May 20, 2019
  84. AP Calculus

    Can someone check my answers: 1) Use geometry to evaluate 6 int 2 (x) dx where f(x) = { |x|, -2

    asked on July 16, 2018
  85. math

    Mr. Rozario bought some numbers of apples and oranges in a ratio of 2:3. He gave away 2/3 of the apes to his sister and 23 oranges to his brother. The ratio of the number of apples to the number of oranges that he has now is 3:2. How many apple did he buy?

    asked on September 5, 2016
  86. math

    suppose x is a uniform random variable with c=40 and d=70. find the standard deviation of x

    asked on February 25, 2014
  87. Math - Advanced Functions

    the function f(x)=-0.005x^2+0.8x+12 models the relationship between a certain vehicle's speed and a fuel economy, where f(x) is the fuel economy in kilometres per litre and x is the speed of the vehicle in kilometres per hour. Determine the rate of change

    asked on September 30, 2013
  88. Physics, URGENT!!!

    We consider tobacco virus diffusing along a 0.47 m long tube filled with water. The cross-sectional area of the tube is unknown. The diffusion coefficient is found in Table 10.5, p. 319 in the textbook. A total amount of virus of 2.6 x 10-16 kg is

    asked on November 29, 2010
  89. Algebra

    In a basketball game, Sam scored 34 pts, consisting only of 3 point shots and 2 point shots. He made a total of 15 shots. How many shots of each type did he make?

    asked on December 5, 2016
  90. APUSH

    Hi this is my essay prompt for APUSH. I am a little confused about this prompt. I don't really know where to start. Also I'm not sure what my 3 body paragraphs should be about. If you could help me with this it would be great. Thank you Sydney Why would

    asked on January 26, 2016
  91. Physics

    a dense plastic toy mass of 1.2kg is floating just beneath the surface of a pond. What is the bouyant force?

    asked on March 12, 2011
  92. Algebra 1

    HELP ME Simplify each polynomial Write in standard form (Hint: watch for the operations, add, sub , multiply) (6s^4+7s^2+7)+(8s^4-11s^2+9s) (4h^3+3h+1)-(-5h^3+6h-2) (8z^3-3z^2-7)-(z^3-z^2+9) 5k(3-4k) 4m(2m+9m^2-6) q(11+8q-2q^2 ) (x-2)(x+4) (6g+7)(3g-8)

    asked on May 9, 2019
  93. college algebra

    A support pole for an ancient structure is found to have one-fifth of the carbon-14 of a modern, living tree. How long ago did the tree used to make the support pole die? Give your answer to the nearest whole number.

    asked on September 17, 2018
  94. Algebra 2

    Please HELP ME Simplify each polynomial Write in standard form (Hint: watch for the operations, add, sub , multiply) (6s^4+7s^2+7)+(8s^4-11s^2+9s) (4h^3+3h+1)-(-5h^3+6h-2) (8z^3-3z^2-7)-(z^3-z^2+9) I just need the answers to these these few problems I just

    asked on May 10, 2019
  95. Algebra

    a small plane can fly 1575 miles in 7 hrs in a tailwind. On the return in a headwind, the same trip takes 9 hrs. find the speed in still air (no wind). Then the speed in wind.

    asked on December 9, 2016
  96. algebra

    A clock has a minute hand that is 14 feet long and an hour hand that is 9 feet long. What is the average speed (in mph) of the tip of the minute hand no idea how to solve this... please help :)

    asked on February 4, 2016
  97. Chemistry

    Can you please explain to me how you would regulate the pressure to favor the products in the this equilibrium system. MgCO3(s)-->

    asked on August 11, 2015
  98. Math

    Peter has money in two savings accounts. One rate is 9% and the other is 11%. If he has $400 more in the 11% account and the total interest is $117, how much is invested in each savings account?

    asked on November 26, 2014
  99. algebra

    A rectangular parcel of land is 70 ft longer than it is wide. Each diagonal between opposite corners is 130 ft. What are the dimensions of the parcel? The answer is 50 ft by 120 ft, but I don't know how to find the answer

    asked on December 19, 2011
  100. Physics

    A person driving her car at 54 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 30 m away from the near side of the intersection. The intersection is

    asked on September 11, 2011


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