Alexandra

Most popular questions and responses by Alexandra
  1. Geometry

    You are planning to use a ceramic tile design in your new bathroom. The tiles are blue-and-white equilateral triangles. You decide to arrange the blue tiles in a hexagonal shape as shown. If the side of each tile measures 7 centimeters, what will be the

    asked on April 10, 2012
  2. ap chem

    calculate the lattice enthalpy of potassium fluoride from the following data: enthalpy of formation of K(g): +89 kJ · mol−1 first ionization energy of K(g): +418 kJ · mol−1 enthalpy of formation of F(g): +79 kJ · mol−1 electron affinity of F(g):

    asked on July 13, 2010
  3. chem

    write the correct net ionic equation and identify spectator ions when CoSO4 and BaCL2 mix

    asked on September 29, 2013
  4. chem

    The reaction: 2C2H2+5O2->5O2->4CO2+2H2O is performed by mixing 175 grams of C2H2 and 175 grams of O2 to produce 127 grams of CO2 1)Limiting reagent 2)Theretical yeield of CO2 3)Percent yield of CO2

    asked on September 29, 2013
  5. Physics

    If the puck strikes the goalie's pads and stops in a distance of 4.14 cm, what average force is exerted on the pads? Answer in units of N. This is part three of three parts. 1st Part: A player strikes a hockey puck giving it a velocity of 39.486 m/s. The

    asked on November 25, 2012
  6. Physical Science

    Which of the following is a single replacement? a. KOH + HCl --> KCl + H2O b. 2Na + 2H2O --> H2 + 2NaOH c. 2C2H6 + 7O2 --> 4CO2 + 6H2O d. H2O + CO2 --> H2CO3 Any help would be appreciated, thank you in advance!

    asked on October 11, 2013
  7. Chemistry Please help

    A bottle of 12.0 M hydrochloric acid has only 35.7 mL left in it. What will the HCl concentration be if the solution is diluted to 250.0 mL?

    asked on September 29, 2013
  8. Physical Science

    C(s) + H2O(g) + Heat CO(g) + H2(g) 17. How would you adjust the temperature to increase the amount of product? 18. Does the removal of hydrogen gas as it is produced shift the reaction to the left or the right? My last two questions on my homework that I

    asked on October 11, 2013
  9. Physics

    A 10.2 kg weather rocket generates a thrust of 200N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 500N/m, is anchored to the ground. a) Initially before the engine is ignited,

    asked on November 25, 2010
  10. geometry

    Point C is the center of the circle. Arc AB measures 5x + 2. Angle ACB measures 3x + 14. Find the value of x.

    asked on October 27, 2011
  11. Chemistryy

    what mass of silver nitrate (AgNO3) is required to prepare 400 grams of a 3.50% solution of AgNO3? Options: 1. 0.00875 g 2. 114.28 g 3. 1400 g 4. 14 g

    asked on July 13, 2010
  12. Math

    9. Find the product. –14(8) = ? (1 point) –112 112 –108 –116 10. What is the product of –7 and –12? (1 point) –84 84 –74 74 11. Find the quotient. 36 ÷ (–3) = ? (1 point) 13 –13 –12 12 12. What is the quotient of –24 and 8? (1

    asked on May 8, 2019
  13. Chemistry

    We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true

    asked on October 14, 2015
  14. English

    1. What is the best summary of lines 1–16? (1 point) Alice cannot reach the doorknobs. Alice keeps shrinking until she is very tiny. She talks about being smaller than furniture in the room. She throws the Rabbit’s gloves and fan on the floor. When she

    asked on May 21, 2019
  15. Physics

    A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 180 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle? Okay so this is my work for this problem. please help If I did something

    asked on September 13, 2014
  16. Physics

    Your projectile launching system is partially jammed. It can only launch objects with an initial vertical velocity of 42.0 m/s, though the horizontal component of the velocity can vary. You need your projectile to land 211 m from its launch point. What

    asked on September 13, 2014
  17. Chemistry

    If 10.0 grams of sodium bicarbonate reacts with 50.0mL of 2M acetic acid, what is the limiting reactant? what reactant is in excess, and by how much? What volume of carbon dioxide gas would form?

    asked on March 10, 2011
  18. Math

    Consider the quotient, f(x)/x-h What is the remainder of this quotient? My answer- f(x-h)

    asked on May 31, 2019
  19. Financial math

    A couple wants to lend money using the house value as a cover. The lender will lend them 70% of the value of the house. The couple bought the house 12 years ago for $ 79,000. The house is financed by a deposit of 20% and a mortgage loan at 30 years and 12%

    asked on May 10, 2019
  20. physics

    A 20-N horizontal force pushes an object along a rough floor so that the object moves with a constant velocity of 7.0 m/s. How much power does this force deliver to the object?

    asked on August 29, 2012
  21. Chemistry

    In the study of biochemical processes, a common buffering agent is the weak base trishydroxymethylaminomethane, often abbreviated as Tris. At 25 C, Tris has a pKb of 5.91. The hydrochloride can be abbreviated as Tris HCl. What volume of 10.0 M NaOH is

    asked on November 14, 2010
  22. physics

    When a 2.60-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.30 cm. (a) What is the force constant of the spring? (b) If the 2.60-kg object is removed, how far will the spring stretch if a 1.30-kg

    asked on April 21, 2010
  23. math

    The data set below shows the number of players on each softball team in a tournament: 9 12 8 7 7 21 11 9 8 7 10 7 10 11 Which of the following statements is true based on the data set?

    asked on May 31, 2017
  24. MATH

    Fabio said that there are 3 times as many people on a basketball team as on a tennis team. Is he correct? Explain why or why not.

    asked on October 17, 2013
  25. scientist

    Which is the best reason for the smaller number of drone bees compared to the number of worker bees in a beehive?

    asked on August 27, 2011
  26. Math

    If the hypotenuse of a triangle is 15 yds, and one leg is 12 yds, what is the length of the other leg? Also how do you find the answer

    asked on November 21, 2018
  27. Science

    Assume you can heat water with perfect insulation (all the heat from combustion of ethanol is transferred to water). What is the volume of ethanol required to heat 100 mL of water by 10 degrees C? (You will need to look up density of ethanol, specific heat

    asked on March 21, 2013
  28. Chemistry

    Xe(g) + F2(g) ----uv light---> Xe F2(s) XeF2(g) + 2F2(g) ---catalyst---> XeF6(s) XeF6(s) + H2O(l) ------> Xe O3(s) + 6HF(g) Looking at these three reactions respond the following: a) For each 0.0250 grams of xenon hexaflouride that reacts, what mass of

    asked on January 22, 2012
  29. Chemistry

    A gas storage tank has a volume of 3.5*10^5 m^3 when the temperature is 27 degrees celcius and the pressure is 101 kPa. What is the new volume of the tank if the temperature drops to -10 degrees celcius and the pressure drops to 95 kPa?

    asked on February 23, 2010
  30. World History

    How did Renaissance thinkers think the individual was defined? Explain how this idea can be compared with the value of an individual in ancient Roman and medieval European societies. Any help with this question would be greatly appreciated. Please and

    asked on September 11, 2013
  31. Algebra

    How long will it take $7,000 invested at 5.5% compounded daily to grow to $14,000? Round your answer to the nearest tenth of a year.

    asked on December 2, 2009
  32. Physics

    A large pot is placed on a stove and 1.2 kg of water at 14°C is added to the pot. The temperature of the water is raised evenly to 100°C just before it starts to boil. (a) What amount of heat is absorbed by the water in reaching 100°C? (b) The water

    asked on October 27, 2014
  33. Chemistry

    How many moles of acetic acid are there in 25 mL container?

    asked on March 10, 2011
  34. Physics

    On Earth a fit astronaut without a space suit and life support pack can leap straight up and leave the ground with an initial vertical velocity of about v1y = 2.4 m/s and rise to a height of about h = 0.24 m above the point where he first loses contact

    asked on September 17, 2014
  35. Physics

    (c) On Earth a fit astronaut without a space suit and life support pack can leap straight up and leave the ground with an initial vertical velocity of about v1y = 2.4 m/s and rise to a height of about h = 0.24 m above the point where he first loses contact

    asked on September 17, 2014
  36. Algebra

    A candy cane 30 cm high has a circumference of 3 cm. The red “ribbon” makes exactly 4 complete turns round the candy cane while its two ends touch the cane's top and bottom. How long is the ribbon in cm? It doesn't make any sense to me. Can somebody

    asked on February 1, 2011
  37. college alg help!

    cannot figure a way to do this problem: An investment of $98,000 was made by a business club. The investment was split into three parts and lasted for one year. The first part of the investment earned 8% interest, the second 6%, and third 9%. The total

    asked on November 18, 2010
  38. Science

    In a fetal pig, what are the 4 lobes of the brain and their functions?

    asked on February 21, 2014
  39. physics

    A 16.0-N weight slides down a rough inclined plane that makes an angle of 28.0° with the horizontal. The weight, which started from rest, gains a speed of 15.0 m/s after sliding 150 m. How much work is done against friction?

    asked on August 29, 2012
  40. Physics

    A juggler throws a ball with an initial horizontal velocity of +1.1 m/s and an initial vertical velocity of +5.7 m/s. What is its acceleration at the top of its flight path? Make sure to consider the sign when responding. Consider the upward direction as

    asked on September 13, 2014
  41. calculus (gr 12)

    The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3 , where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c)

    asked on April 16, 2013
  42. Physics

    A juggler throws a ball with an initial horizontal velocity of +1.1 m/s and an initial vertical velocity of +5.7 m/s. What is its acceleration at the top of its flight path? Make sure to consider the sign when responding. Consider the upward direction as

    asked on September 13, 2014
  43. math

    A plane flying with a constant speed of 14 km/min passes over a ground radar station at an altitude of 7 km and climbs at an angle of 35 degrees. At what rate, in km/min, is the distance from the plane to the radar station increasing 5 minutes later?

    asked on May 24, 2011
  44. Chemistry

    Write the formula of the corresponding acid that contains this anion. Express your answer as a chemical formula. The arsenite ion has the formula AsO33−.

    asked on February 21, 2017
  45. earth science

    Traditionally,how have different fields of earth science been studied?

    asked on November 29, 2007
  46. health

    List sources of internal pressure and external pressure

    asked on June 2, 2016
  47. Calculus

    Does my answer look correct? Find the derivative. 11, y= (e^3-e)(e+5)/6e my work: ((6e)(4e^3 + 15e^2 - 2e - 5) - (6)(e^4 + 5e^3 - e^2 - 5e))/ (6e)^2 Multiplied/divided everything through My answer: (10e^2 + 30e - 3)/ 18 I cant follow your work: I assume e

    asked on December 19, 2006
  48. Math

    What is 3/5 of 25?

    asked on December 14, 2016
  49. AP Chemistry

    If a saturated solution of Potassium Chlorate at 80 degrees celsius cools to room temperature (25 degrees celsius), how many grams of crystals form?

    asked on December 31, 2014
  50. Physics

    A circular pond of radius 12 m has a layer of ice 0.25 m thick. On a spring day, the temperature of the water below the ice is 4.0°C and the temperature of the air above is 11°C. What is the rate of heat transfer through the ice, in kW?

    asked on October 27, 2014
  51. Science (Balanced/Unbalanced Forces)

    "Toy Car A" is propelled by elastic force. The other forces acting on the car are gravity (pulling the car down) and friction force (between the car and the floor). What UNBALANCED forces are acting on the car? "Toy Car B" is propelled by air resistance.

    asked on December 19, 2013
  52. physics

    An object of mass 5 kg is dropped from a certain height. Just before it strikes the ground it has a kinetic energy of 1250 J. From what height was the object dropped? Ignore air resistance and use g = 10 m/s2.

    asked on August 29, 2012
  53. math

    To solve for the following proportion, you could use equivalent ratios, divide out the known ratio, or use cross products. Choose one of these methods to solve for t. Show your work and explain why you chose that method. 18/5 = 4/t

    asked on June 6, 2011
  54. physics

    A 20.0kg mass is placed a the top of a 3.5m long, 15degree ramp. When released from rest, the mass accelerates down the ramp. The frictional force acting on the mass is 11.0 N. What is the velocity of the mass at the bottom of the ramp.

    asked on December 9, 2009
  55. earth science

    how are scientist approaching the study of Earth today?

    asked on November 29, 2007
  56. Physics Help

    A circular pond of radius 12 m has a layer of ice 0.25 m thick. On a spring day, the temperature of the water below the ice is 4.0°C and the temperature of the air above is 11°C. What is the rate of heat transfer through the ice, in kW?

    asked on October 28, 2014
  57. Chemistry

    So I do know how to work out letter a) but I'm still very confused with parts b and c. Appreciate the help! 2FeN(s) + 3H2(g) --> 2Fe(s) + 2NH3(g) Suppose that the reaction is carried out at 300C and 3.00 atm. 1.00 grams of iron (III) nitride reacts. a)What

    asked on January 22, 2012
  58. Calculus

    I don't understand how to answer this problem: The base of a solid is bounded by y=x+1 and y= x^2-1. Find the volume of the solid if the cross section is perpendicular to the x axis are equilateral triangles.

    asked on April 17, 2011
  59. Math

    How can i make nine equations with the numbers 2, 7 and one other number to equal 8. The first equation should have one as the other number, then two and so on up to 9. I can only use a number once for each expression. I can use arithmetic symbols,

    asked on April 10, 2007
  60. Spanish

    If I wanted to say "My brother was born", could I write "Mi hermano fue nacido"? Yes, but "mi hermano nacio'" is more frequently used Thank you for using the Jiskha Homework Help Forum. Trust drwls. The correct way is to say "mi hermano nació" and be sure

    asked on December 18, 2006
  61. Math

    What is the probability of winning the jackpot if you play the Florida lotto? What is the probability of winning that jackpot if you play Mega Millions? What is the probability of winning the jackpot if you play Powerball?

    asked on March 31, 2016
  62. science

    in this experiment, 3 sets of plants were grown. one set had no light, one set had some light, one set had full sun. each set was given the same amount of water, the same temperature, the same soil and it was the same plant and same pot. in 21 days this is

    asked on October 8, 2015
  63. Physics

    Two girls decide to jump off a diving board. Katherine steps off the diving board. Anna runs straight off the diving board so that her initial velocity is solely horizontal. They both leave the diving board at the same time. Which one lands in the water

    asked on September 13, 2014
  64. Physical Science

    24. What happens when a solution of nitric acid (HNO3) is added to a solution of potassium hydroxide (KOH)? What are the products? 25. Which of the following compounds can react with H2SO4 to form a salt: NaCl, Ca(OH)2, HF, AlCl3, H2O, Mg(OH)2? Name the

    asked on October 15, 2013
  65. Algebra 1

    A vending machine had to be programmed to accept any combination of nickels, dimes, and quarters that totals 40 cents. How many different combinations are possible?

    asked on October 7, 2013
  66. Calculus

    The base of a solid is bounded by y=2sqrtx, y=2 and x=4. Find the volume of solid if cross sections perpendicular to y=2 are semicircles

    asked on April 17, 2011
  67. 6th grade

    Can you simplify 9 over 16?

    asked on October 26, 2010
  68. college physics

    Let's say that you find a slope of 6.671×10-14 for square plates of width 11.5 cm. What do you get for the value of the permittivity of free space?

    asked on January 24, 2010
  69. Language Arts

    Risk is to chance as forthought is to?

    asked on December 8, 2009
  70. French

    meobdailfr.... its french what is the unscrambled...

    asked on September 26, 2009
  71. physical Science

    I'm having a lot of trouble writing my lab report it's on Density of common Solids and I'm so confused. PLEASE HELP!

    asked on September 28, 2008
  72. science

    What happends when the semi major axis is longer?

    asked on January 28, 2008
  73. history

    Why was it smart for European colonial powers to wield power in their newly-acquired colonies through indirect rule? Can you draw parallelisms with previous dominant civilizations?

    asked on June 16, 2017
  74. Physics

    Calculate the momentum of a bullet moving with a velocity of 1000m/s ,if it has a mass of 0.01kg

    asked on December 13, 2015
  75. Algebra 1

    I've tried so hard on this and I'm completely hopeless, can somebody help me out? Please it would mean a lot. Task 1 find the rate of change for each table, equation, or graph. How did you find the rate of change? Task 1 A. X 2 4 6 Y 10 20 30 Rate of

    asked on December 20, 2014
  76. Science (Help, please!)

    "Toy Car A" is propelled by elastic force. The other forces acting on the car are gravity (pulling the car down) and friction force (between the car and the floor). What UNBALANCED forces are acting on the car? "Toy Car B" is propelled by air resistance.

    asked on December 19, 2013
  77. chem

    how many mL of .135M Sr(OH)2 are needed to neutralize 35ml of .157M HCL I know the answer came out to 20.4 ml My only question is how do I convert HCL to Sr(OH)2

    asked on September 29, 2013
  78. Algebra 1

    The manager of a shopping mall was asked to rope off a rectangular section of the parking lot for an automobile show. The area roped off was 250 ft by 300 ft. Post were to be placed every 25 ft around the lot. How many posts were needed? The one question I

    asked on September 9, 2013
  79. algebra

    The Environmental Protection Agency set a standard of 50 parts per billion of lead in drinking water. A new standard was set that safe water contains less than 15 parts per billion. a) write each of these rates as fractions using positive powers of ten. b)

    asked on August 26, 2013
  80. Grade 12 Calculus

    State the absolute maximum value and the absolute minimum value of each function, if the function is defined on the interval shown. {I CANNOT POST THE GRAPH SO CAN SOMEONE EMAll ME AT miss.a.parker at hot mail(. com) SO I CAN EMAIL IT TO THEM SO YOU CAN

    asked on April 15, 2013
  81. statistics

    . A certain researcher thinks that the proportion of women who say that female bosses are harshly critical is greater than the proportion of men. In a random sample of 200 women, 27% said that female bosses are harshly critical. In a random sample of 220

    asked on November 28, 2012
  82. Chemistry

    If the concentration of a reactant is decreased, will the speed of the reaction increase or decrease? Explain. I understand that if the concentration of a reactant is INCREASED, the frequency of coliision increases, making the rate of reaction increase.

    asked on January 31, 2012
  83. Desert

    How are deflation hollows made? Could you also give me some more pictures of hoodoos (the landforms)?

    asked on October 29, 2011
  84. math

    A green purse costs $11, which is 11 times as much as a red tie costs. How much does the red tie cost?

    asked on October 7, 2011
  85. Math/3rd grade

    If you forget the product of 9 and 9, what can you do to figure it out?

    asked on January 13, 2011
  86. 6th grade

    how do you do rate of change?

    asked on December 8, 2010
  87. chemistry

    how many joules are formed when 3 moles oh CH4(g) react?

    asked on March 21, 2010
  88. math

    The quotient of two numbers is 8. The sum of the same two numbers is 72. What is the two numbers

    asked on February 10, 2010
  89. Biology

    The adaptations of land-dwelling organisms forgetting oxygen show a trade-off of two needs. What are they?

    asked on November 24, 2009
  90. College Applications

    Where can i find out what format to type my Background Information that entails Activities I have been in, the awards I have received from them, and past jobs that i have had? Thankyou.

    asked on January 22, 2009
  91. Math

    Find the domain and range y=x^2-3x+8. Explain how you found the domain and range.

    asked on November 1, 2007
  92. chemistry

    At ph of 12 what charged groups would be present on glycine I said a NH2 and coo- Answered with some reluctance above.

    asked on March 17, 2007
  93. social studies

    1. la salle had conflics with which of the following groups of american indiands? hasinai caddo apache karankawa my answer is d 2. what happened when the spanish found the french colony they engaged the french settlers in warfare and killed many of them

    asked on September 22, 2018
  94. Chemistry

    Initially a 1 L vessel contains 10 moles of NO2 and 6 moles of O2. At equilibrium, the vessel contains 8.8 moles of NO2. Determine Kc. Please help

    asked on May 9, 2017
  95. Math

    A ramp has been rise of 1.5 m for every 12 m of run. What is the slope of the ramp?

    asked on February 27, 2017
  96. bio

    The human egg cell above is magnified using a 10´ ocular lens and a 40´ high power objective lens. (a) Calculate the overall magnification. (b) If the field of view at high-power magnification is 400 mm, calculate the size of the field of view when the

    asked on January 7, 2017
  97. math

    in this experiment, 3 sets of plants were grown. one set had no light, one set had some light, one set had full sun. each set was given the same amount of water, the same temperature, the same soil and it was the same plant and same pot. in 21 days this is

    asked on October 8, 2015
  98. College Algebra

    Find all real numbers x satisfying the equation: 2^x + 3^x - 4^x + 6^x - 9^x = 1. Please help me. I really don't know what to do.

    asked on January 26, 2015
  99. Math, Please Help! I don't understand!

    I need help because I don't understand how to solve this equation. 37. x/a - 1 = y/b for x So... does it mean solve for x? 39. V = 1/3 * pi * radius^2 * h for h So... does it mean solve for h? As you can see, I am really confused. Please help.

    asked on November 4, 2014
  100. data management

    The stay at a hotel on Spring Break is normally distributed with a mean of 7 days and a standard deviation of 2 days. If 8000 people visited this hotel on Spring Break... a) If a visitor stays 6 days what is the corresponding z-score? b) How many visitors

    asked on June 11, 2014

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