1. 11th grade ..CHEMISTRY

    This is a Quantitative Redox titration. (KMnO4) = 1.8 G.. 500 ML after the experiment we had to record the data of the 3 trials. 1. Trial - VolUme FeSO4 = 10.00 Ml - VOlume KMnO4 11.00 Ml 2. Trial - VolUme FeSO4 = 10.00 ML - VOlume KMnO4 11.15 Ml and we
  2. 7th grade math Ms. Sue please

    13. A baseball bat and 8 baseballs cost $163.25. The bat costs $106.45. What is the cost c of one baseball? (1 point) 163.25 – 8c = 106.45; $33.71 8c + 106.45 = 163.25; $7.10 8c + 163.25 = 106.45; $7.10 8c – 106.45 = 163.25; $33.71 14. Mark weighs 74
  3. Chemistry

    Hydrogen peroxide solution, H2O2(aq), is available with a concentration of 1.667mol/L. When diluted to a concentration of 0.25mol/L, the solution is used as a disinfectant. What volume of water should be added to 100 mL of the concentrated hydrogen
  4. Physics

    A 6090kg space probe mobing nose-first toward Jupiter at 105m/s relative to the Sun, fires its rocket engine ejecting 80 kg of exhaust at a speed of 253 m/s relative to the space probe. What is the final velocity of the probe? I should have gotten 108m/s
  5. Chemistry- Acids and Buffers

    Cyanic Acid is a weak acid HOCN + H2O <--> H3O+ +OCN- ka= 3.5*10^-4 a) if 2.5ml of 0.01 M cyanic acid solution is added to 25.0 ml of a formis acid buffer with ph = 3.70, what is the ratio of [OCN-]/[HOCN] in the resulting solution? b) determine the
  6. calculus

    An automobile computer gives a digital readout of fuel consumption in gallons per hous. During a trip, a passenger recorded the fuel consumption every 5 minutes for a full hour of travel. time: 0 / gal/h: 2.5 time: 5 / gal/h: 2.4 time: 10 / gal/h: 2.3
  7. Chemistry

    What is the pH at the equivalence point when 0.10 M HNO_3 is used to titrate a volume of solution containing 0.30 g of KOH?
  8. Chemisty

    An ideal gas with an initial volume of 96L, temperature of 277K, and 7.3mol is permitted to come to a second state with a volume of 450mL and a temperature of 203C. Show the calculation for the final number of moles of gas in the system.
  9. chemistry

    Energy must be transferred into or out of a system in order to cause phase change.In addition changes in the energy can be directly related to pressure volume changes.If equal moles of each gas is compressed which one would have the largest pressure volume
  10. chemistry

    Energy must be transferred into or out of a system in order to cause phase change.In addition changes in the energy can be directly related to pressure volume changes.If equal moles of each gas is compressed which one would have the largest pressure volume
  11. chemistry

    Energy must be transferred into or out of a system in order to cause phase change.In addition changes in the energy can be directly related to pressure volume changes.If equal moles of each gas is compressed which one would have the largest pressure volume
  12. s.s

    According to legend, the Aztec god of war told them to build their capital where they saw "an eagle perched on a cactus and holding a snake in its beak." This image forms part of what modern nation's flag today? (1 point) ColombiaMexicoPanamaPeru 2. The
  13. Chemistry

    How many grams of ethanol must be added to 500.0 g of water to make a solution that freezes at 0.00 degrees fahrenheit? The molal freezing point depression constant for water is 1.86 degree celsius over moles.
  14. chemistry

    How many grams of ethanol must be added to 500.0 g of water to make a solution that freezes at 0.00 degrees fahrenheit? The molal freezing point depression constant for water is 1.86 degree celsius over moles.
  15. Chemistry

    a sample of helium gas is in a closed system with a movable piston. the volume of the gas sample is changed when both the temperature and the pressure of the sample are increased. the table below shows the initial temperature, pressure, and volume of the
  16. Math

    A circular swimming pool is 4 feet deep and has a diameter of 15 feet. If it takes 7.5 gallons of water to fill one cubic foot, to the nearest whole number, how many gallons are needed to fill this swimming pool.
  17. Math: Linear Programming

    Describe the linear programming situation for this system of inequalities. x≤1 , y ≥0 , 3x+y≤5 infeasible unbounded an optimal solution alternate optimal solutions Describe the linear programming situation for this system of inequalities
  18. Math Word Problem

    A cross section of a nuclear cooling tower is a hyperbola with equation x^2/90^2-y^2/130^2=1. The tower is 450ft tall and the distance from the top of the tower to the center of the hyperbola is half the distance from the base of the tower to the center of
  19. Chemistry

    What other physical properties other than specific heat could be used to identify metals? spectroscopic lines and density to name two others. Melting point, boiling point, solubility in certain solvents are three others.
  20. Physics

    An automobile is traveling 65mph. Its brakes decelerates at 6.0mps. How long will it takes to stop the car?
  21. Physics

    Compute the entropy change of a system consisting of 1kg of ice at 0•C which melts (reversibly) to water at the same temperature. The latent heat of melting is 79.6 Cal/g
  22. PHYSICS!

    0.115 kg of water at 81.0o C is poured into an insulated cup containing 0.220 kg of ice initally at 0o. Calculate the mass of liquid when the system reaches thermal equilibrium.
  23. Business

    Lisa is considering a wireless order-taking system, and she has asked you to do a cost analysis of acquiring it. Consider the following information in your analysis: • The acquisition cost is $35,000 paid at the time of installation. • It reduces the
  24. physics

    two charge 5NC and -2NC are placed at a point (5cm,0,0)and (23cm,0,0)in a region of a space where there is no other electric field.calculate the electrostatic potential energy of this charged system
  25. Science

    What is the principle role of a tower within a cellular system? (1 point) A.to track data usage*** B.to transmit signals C.to pinpoint locations D.to reduce line noise
  26. Social Studies

    The one-child policy of 1979 was a system used to regulate population growth within this country. (1 point) a. India b. Soviet Union c. United States d. China***
  27. Sublimes?

    Question: An unknown compound gave a melting point of 230C. When the molten liquid solidified, the melting point was redetermined and found to be 131C. Give a possible explanation for this discrepancy. My answer: The compound sublimed. How would
  28. Chemistry

    The normal boiling point of ethanol is 78.4°C. When 9.16 g of a soluble nonelectrolyte was dissolved in 100. g of ethanol, the vapor pressure of the solution at that temperature was 7.40 102 Torr. (a) What are the mole fractions of ethanol and solute? (b)
  29. physics

    a car with a mass of 900kg and a car with a mass of 2000kg collide. one car is moved away from the impact point as one mass at 16.0m/s in the direction 24 degrees west of south. what was the initial speed of each car prior to the collision?
  30. Algebra

    Foam fingers sold for $5. Spirit bracelets for $4. You sold 40 more foam fingers than bracelets and earned $965. Write a system of equations to describe this situation. Solve this system using as least 2 different methods. Explain each method.
  31. Chemistry

    When given a chemical reaction, how would I know whether a reaction is endo or exothermic and whether work is done on the system or by the system. Without using any calculations. So I have a couple reactions which I have to use chemical reasoning to to
  32. Business

    Identify the ROI and NPV of the wireless order-taking system. Provide all calculations for the ROI and NPV in the speaker notes. Discuss some of the intangibles Lisa needs to consider and make a recommendation as to whether Lisa should order such a system.
  33. 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 :(
  34. Science

    You have a block of ice with a mass of 6.12 . The volume of the water is 100L and the volume of water when the ice is in the water is 106.66L. I subtracted 100.00 and 106.66 to get 6.66L as the volume of the ice What I'm confused about is how to divide
  35. physics

    A section of an alpne cable-car system has a maximum permissible mass of each car with occupants in 2800kg. The cars riding on a support calbe ar pulled by a second cable attached to each pylon(support tower); assume the cables are straight. What is the
  36. help please(:

    The neighborhood skateboard club is starting a fundraiser in order to buy more skateboards. They have decided to sell logo mugs. The Mugs on Mugs Company offers to supply mugs to the club for $3.75 each plus a $55 process and handling fee. The Punny-Cups
  37. Calculus

    Time (min)0___10___20____30__40____50____60 Temp (F)68_72.64_76.97__80_82.9_85.38__87.5 Use the Trapezoidal Rule to find the best approximation you can for the average temperature in the trailer from 10:00 until 11:00. (10/60)/2 (68 + 2(72.64) + 2(76.97) +
  38. algebra 2

    The number of milligrams of a drug that remains in a patient’s system after t hours is given by the function A(t) = Iert. Jordan was given 350 milligrams of medicine which leaves his bloodstream at a rate of 20%. How much of the medicine remains in his
  39. Astronomy

    In one sentence I need to describe the shapes of the orbits of the planets. The shape must be accounted for in a model of the solar system, and of the solar system formation. My answer would be that the shapes of the orbits are round. Yet this seems to
  40. Physics

    A object-spring system oscillates with an amplitude of 4.0 cm. If the spring constant is 210 N/m and object has a mass of 0.50 kg, determine each of the following values. (a) the mechanical energy of the system J (b) the maximum speed of the object m/s (c)
  41. Physics

    A object-spring system oscillates with an amplitude of 4.0 cm. If the spring constant is 210 N/m and object has a mass of 0.50 kg, determine each of the following values. (a) the mechanical energy of the system (b) the maximum speed of the object (c) the
  42. Chemistry

    Two substances in a glass beaker react chemically and the glass beaker becomes too hot to touch. A. Is this an exothermic or endothermic reaction. It would be exothermic, right? Because energy is released? B. If the two substances are defined as the
  43. world history

    Can you check my answer? Question: What was the political system like in most parts of Africa [Ashanti and Ibo are good examples] Answer: In most parts of Africa the political system had no ruler to control the villagers so the citizens made their own
  44. Health Care Fnancial Accounting

    the local school system asks to submit a proposal to do pre-employment physicalsfor 60 bus drivers. What financial or accounting informaton is needed to submit the proposal? what shall I charge the school system?
  45. Java

    I need help putting the following trace into pseudocode 1 public class testOperators 2 { 3 public static void main(String[] args) 4 { 5 int x; 6 int y = 12 7 double z = 13.0; 8 x = 14 9 System.out.println(“x + y + z = “ + (x + y +z)); 10 x += y; 11
  46. SOLOR SYSTEM

    WHAT IS THE DISTANCE BETWEEN FROM THE SUN AND EARTH TO ALL THE PLANETS http://www.windows.ucar.edu/tour/link=/kids_space/distance.html =) every thing that goes a round the sun is called an ecosystem It's size solor system has 9 planets.
  47. Chemistry

    Substance A has a melting point of -10 degree celcius and a boiling point of 57 degree celcius. Sunstance B has a melting point of -67 degree celius and a boiling point of 15 degree celius. Room temperature is 20 degree celcius. (A) What is the physical
  48. Chemistry

    a 191 g piece of copper is heated to 100 C in a boiling water bath and then dropped into a beaker containing 755 g of water (density =1.00 g/cm3) at 4.0 C. What is the final temperature of the copper and water after thermal equilibrium is reached?
  49. Physics

    Can someone help me solve this? I've tried it a few times, but I keep getting answers that seem off. Like, for example, I'm getting 2.339 for part A, and it just seems completely off. So if you know the right formulas and can walk me through this, I'd
  50. Physics

    In the system shown in the figure, suppose the block has a mass of 2.7kg , the spring has a force constant of 500N/m , and the coefficient of kinetic friction between the block and the floor is 0.18. Find the work done on the block by the spring and by
  51. physics 2 **

    A blacksmith drops a 0.60 kg iron horseshoe into a bucket containing 25 kg of water. (a) If the initial temperature of the horseshoe is 600°C, and the initial temperature of the water is 40°C, what is the equilibrium temperature of the system? Assume no
  52. Physics

    You build a toy model of a water slide. A red 225 g toy car slides down a 40 degree frictionless ramp. At the bottom, just at it exists onto a horizontal part of the slide, it collides with a purple 450 g car at rest. How high should you make the water
  53. Algebra333333!!!

    Choose the ordered pair that is a solution to the system of equations. 3x - y = 9 2x + y = 6 (3,0) (3,-18) (3,-1) (3,1) Once again add the two equations to get 5x = 15 Solve for x and substitute into either equation to find y.
  54. Chemisty

    A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution?
  55. chemistry

    you dissolve 6.55g of potassium nitrate in enough water to make a 250ml solution. if you add 1.25 l of additional water to this solution.what is the molarity of this new solution.
  56. algebra

    what is the solution of the following system {3x + 3y =10 {-9x-9 =-30 Can you show step by step please.
  57. chemistry

    which system is under higher pressure, a column of mercury or a column of water
  58. physics

    Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where horizontal axis is V and each unit is 0.5*10^-3 m^3, V1 = 1.0*10^-3 m^3 and V2 = 4.0*10^-3 m^3. The vertical axis is P(N/m^2); A is (1.0*10^-3,2.6*10^6), B is
  59. physics

    Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where horizontal axis is V and each unit is 0.5*10^-3 m^3, V1 = 1.0*10^-3 m^3 and V2 = 4.0*10^-3 m^3. The vertical axis is P(N/m^2); A is (1.0*10^-3,2.6*10^6), B is
  60. physics

    Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where horizontal axis is V and each unit is 0.5*10^-3 m^3, V1 = 1.0*10^-3 m^3 and V2 = 4.0*10^-3 m^3. The vertical axis is P(N/m^2); A is (1.0*10^-3,2.6*10^6), B is
  61. physics

    A 3000-kg truck needs a propeling steady force of 1400 N to travel at a speed of 40 mpg. What is the MPG for the truck if its engine efficiency is 27%? Heat released from one gallon=136,500,000 J and 1 m= 1609 m.
  62. physics

    Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where horizontal axis is V and each unit is 0.5*10^-3 m^3, V1 = 1.0*10^-3 m^3 and V2 = 4.0*10^-3 m^3. The vertical axis is P(N/m^2); A is (1.0*10^-3,2.6*10^6), B is
  63. physics

    A roller coaster car of mass 400kg starts from rest at point A and passes the point B with a speed of 3m/s.if the distance from A to B along the tracks is 20m,how large is the average friction force retarding the motion of the car
  64. Physics

    Guide me through this plz. A single 1,300 kg cargo train car is rolling along a train track at 2.0 m/s when 400 kg of coal is dropped vertically into it. What is its velocity right afterward? Assume a closed system. (Points : 1) 1.5 m/s 2.0 m/s 6.5 m/s
  65. Physics

    A rocket of 500 kg accelerates away from earth with an engine thrust of 13,500 N. a) what is the weight of the rocket? 4900 N b) how fast did the rocket accelerate? (I know the answer is 17.2 m/s^2 but how did they get that?)
  66. ibnozohr

    A point charge Q1=−2 μC is located at x=0, and a point charge Q2=+8 μC is placed at x=−0.5 m on the x-axis of a cartesian coordinate system.The goal of this problem is to determine the electric field, E⃗ (x)=E(x)xˆ, at various
  67. Math

    Find the exact values for the lengths of the labeled segments a, b and p drawn in green, red, and blue, respectively. Note that r=3 is the radius of the circle, and s=2 is the arc length from the point (3,0) around the circle to the indicated point. (So
  68. Math natural logarithms

    The efficiency e of a gasoline engine as a function of its compression ratio r is given by e =1− r^(1−γ) , where γ is a constant. Find γ for e = 0.55 and r = 7.5
  69. Physics

    You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 56 km/h (35mph ). A new model of mass 1900 kg takes 0.15 s from the time of impact until it is brought
  70. Physics

    You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 51 km/h (32 mph). A new model of mass 1900 kg takes 0.18 s from the time of impact until it is brought
  71. Physics

    You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 56 km/h (35mph ). A new model of mass 1900 kg takes 0.15 s from the time of impact until it is brought
  72. Physics

    You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 56 km/h (35mph ). A new model of mass 1900 kg takes 0.15 s from the time of impact until it is brought
  73. Social Sudies please help

    In South Africa, the President is elected by members of the National Assembly who are elected by the citizens. This means that South Africa has WHICH type of government? A) unitary system Eliminate B) direct democracy C) confederal system D) parliamentary
  74. Physics

    How fast does a rocket need to be going to break free of Earth's gravity? How fast would it have to be going in order to completely leave the solar system? (For the second part of this problem, assume that the Sun is the only mass in the solar system and
  75. math

    Louis Braille devised a system of six raised or not-raised dots to signify a letter of the alphabet. a) How many different letters or characters may be coded in Braille? b) If you wanted to code 94 distinct characters, such as those found on a computer
  76. Physics

    How fast does a rocket need to be going to break free of Earth's gravity? How fast would it have to be going in order to completely leave the solar system? (For the second part of this problem, assume that the Sun is the only mass in the solar system and
  77. chemistry

    calculate the freezing point of an aqueous solution containing 10.50 g of MgBr2 in 200 g of water (MgBr2=184 g, Kf for water =1.80 K kg mol-1)
  78. chem

    a.)How many moles of NaOH are required to prepare 2.00L od 0.380M solution? answer is 0.760 mole of NaOH (mole/l * 2.00L) b.)What will be the molarity of a solution if 3.50 g of KOH are dissolved in water to make 150.0 mL of solution? answer is 0.52 M KOH
  79. algebra 2

    the number of milligrams of a drug that remains in a patient's system after t hours is given by the function a(t)=ie^rt. jordan was given 500 milligrams of medicine which leaves his bloodstream at a rate of 25%. how much of the medicine remains in his
  80. element of chemical engineering

    the specific internal energy of a fluid is 200 cal/g .if the fluid leaves a system at a flow rate of 5 g/min ,at what rate does it transport internal energy out of the system?
  81. scienceheat from burning fuel warms the walls of t

    Heat from burning fuel warms the walls of the firebox section of the furnace in A.a hot heating system B.an evaporation system c. a compressor compartment
  82. Algebra

    40. The graph of the following system yields perpendicular lines. x + 2y = -10 -4y = 2x + 20 (True) 48. The graph of the following system yields parallel lines. x - 2y = 1 y = -3x + 10 (False) Thanks -MC
  83. Science

    What body system does coronary heart disease affect? Also How does this disease affect normal homeostasis of the body system
  84. physics

    an automobile moving at constant velocity of 15m/sec passes a gasoline station. two seconds later another automobile leaves the gasoline station and accelerates at a constant rate of 2m/ sec squared. how soon will the second automobile overtake the first ?
  85. Definition

    In which sentence is the word SPUTTERS used correctly? a.The engine SPUTTERS when it is started in the cold. b.The ball SPUTTERS as it bounces across the court. c.That tree SPUTTERS when it drops its leaves. d.The wave SPUTTERS as it breaks over the beach
  86. Chemistry

    1. Sugar can be dissolved in water because of the presence of bonds between _______ in its molecule. 2. If the maximum amount of a compound that can dissolve in 100 mL of water is 22 g, then a solution of 20 g of that substance in 100 mL of water is said
  87. Chemistry

    1. Sugar can be dissolved in water because of the presence of bonds between _______ in its molecule. 2. If the maximum amount of a compound that can dissolve in 100 mL of water is 22 g, then a solution of 20 g of that substance in 100 mL of water is said
  88. physics

    A tourist purchases a car in England and ships it home to the United States. The car sticker advertised that the car's fuel consumption was at the rate of 40 miles per gallon on the open road. The tourist does not realize that the U.K. gallon differs from
  89. Math help plz check my answers!

    1. Write the ratio in the simplest form. 50:10 25:5 10:2 5:1 1:5 2. Solve the following proportion. r/5= 9/21 r = 9 r = 2.14 r = 11.66 r = 37.8 3. A recipe calls for 3 cups of flour to make 3 dozen cookies. Use the proportion to calculate how much flour is
  90. physics

    hi, reading over momentum notes and i just want to clarify a few things. if i had a system containing a cart that was moving (cart 1) and then a cart that was stationary (cart2)would there be any net external force acting on the system between the initial
  91. Chem

    As a part of a study to see whther just the chloride ion on NaCl accelerates the rusting of iron, a student decided to see whtjer iron rusted in a solution on Na2SO4. The solution was made by dissolving 4.550 g of Na2SO4 in water using 125.0 mL volumetric
  92. Extraction

    Lab..again 0.050g benzoic acid/succinic acid/sodium benzoate. -choose 1 and put 0.050g of that compound into 5ml conical vial -add 2ml methylene chloride and 2ml water -cap vial and shake until all solid is dissolved. -let solution sit until 2 layers are
  93. physics

    A horizontal slingshot consists of two light, identical springs (with spring constants of 23.7 N/m) and a light cup that holds a 1.97-kg stone. Each spring has an equilibrium length of 50 cm. When the springs are in equilibrium, they line up vertically.
  94. Physics

    Electric Field of Two Charges : 15.0 points A point charge is located at x=0, and a point charge is placed at on the -axis of a cartesian coordinate system.The goal of this problem is to determine the electric field, , at various points along the -axis.
  95. physics

    An airplane of mass 1.30 104 kg is moving at 52.0 m/s. The pilot then increases the engine's thrust to 7.00 104 N. The resistive force exerted by air on the airplane has a magnitude of 3.00 104 N.
  96. physics

    a pump fills a tank of capacity 300 m^3 in 5 hours.the tank is situated at a height of 20 m.if the efficiency of the tank is 65%. then calculate the power of the engine which has driven the pump.
  97. I need 2 fix these prob. b4 they get 2me on test!

    A father gives his son a ride by pulling a sled across the rough snow. The father runs across the snow with a constant acceleration while pulling the sled at F = 75.0 N, at 30 deg. above the horizontal. The combined mass the sled and son is 30.0 kg. The
  98. Chem

    What would a titration curve look like for 25 mL of 0.400 M NH3 (aq) with 0.200 M HCl (aq) -find initial pH -find 1/2 equivalence point pH and volume of HCl required to reach this point -find equivalence point pH and volume required to reach this point
  99. physics

    4. A train car with mass m1 = 684 kg is moving to the right with a speed of v1 = 7.2 m/s and collides with a second train car. The two cars latch together during the collision and then move off to the right at vf = 4.4 m/s. b) Now the same two cars are
  100. dynamics

    a motorcycle traffic police starts from rest at point A two seconds after a car speeding at the constant rate of 120 km/h passes point A (where speed limit is 100 km/h only) if the policeman accelerates at the rate of 6 m/s^2 until he reaches the speed of