Popular questions and responses by Julia
  1. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.875 M and [Ni2 ] = 0.0100 M. I keep on getting the answer .42 which is incorrect. Thank you so much in advance!

    asked on April 23, 2017
  2. math

    A wooden artifact from an ancient tomb contains 70% of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years. Round your answer to the nearest whole number.)

    asked on November 6, 2015
  3. Chemistry

    Calculate the value of Kp for the equation C(s)+CO2(g)2CO(g) Kp=? given that at a certain temperature C(s)+2H2O(g)CO2(g)+2H2(g) Kp1=3.33 H2(g)+CO2(g)H2O(g)+CO(g) Kp2=.733 Please show detailed steps.

    asked on February 7, 2013
  4. CHEM

    can you show me the formula for this problem. calculate the grams of NaOH present in 9.0 ml of a 8.0 (m/v) NaOH solution. thank you

    asked on March 25, 2014
  5. math

    Nine less than the quotient of two and a number xxx

    asked on August 24, 2018
  6. Mathematics

    Marco purchased a large box of comic books for $300. He gave 15 of the comic books to his brother and then sold the rest on the internet for $330, making a profit of $1.50 on each one. How many comic books were in the box? What was the original price of

    asked on August 11, 2020
  7. Math

    Write the equation of the function that passes through the points (0,0) and (4, 8/9 (fraction) ); has the x-axis as a horizontal asymptote; and has 2 vertical asymptotes x=3 and x= -3. Show calculations. I’m genuinely confused on how to do this question

    asked on August 11, 2020
  8. chemistry

    Calculate the concentration in % (m/m) of a solution containing 20.5 g of LiF dissolved in 340.0 g of H2O. a.1.14% (m/m) b.5.69% (m/m) c.6.03% (m/m) d.6.42% (m/m)

    asked on March 23, 2014
  9. math

    Tierra, Nico, and Alex had $865 altogether. Tierra spent 2/5 of her money. Nico spent $40,and Alex spent twice as much as Tierra. If the three had the same amount of money left, how much money did alex have in the begging?

    asked on February 24, 2011
  10. Mathematics

    Hi I need help with this question someone please. Danny walks 4 km to her stop, and then rides 9 km to school. On average, the bus is 90 km/h faster than Danny's average walking speed. If the entire trip takes 50 minutes, how fast does Rachael walk?

    asked on August 11, 2020
  11. Physics

    A 250N force is applied at an angle of 32 degrees above the horizontal to a 96kg box causing it to slide along a floor. The coefficient of friction between the box and the floor is 0.18. What is the magnitude of the net force on the box? The answer is 67N,

    asked on March 10, 2013
  12. math

    what is the reciprocal of 3 5/7

    asked on November 10, 2012
  13. science

    The modern atomic model includes electrons orbiting the nucleus. Which of the following parts of Dalton's atomic model was disproved by the discovery of the electron? - Atoms are tiny particles. - Atoms cannot be divided into smaller parts . - Atoms have

    asked on September 23, 2015
  14. chemistry

    In which of the following pairs of ionic compounds are both members of the pair soluble in water? a.AgNO3 and AgCl b.LiOH and Li2SO4 c.PbSO4 and BaCO3 d.NH4I and Sn3(PO4)2

    asked on March 23, 2014
  15. chem

    AgNO3+NaOH-->AgOH+NaNO3 give me molecular , total ionic and net ionic???"

    asked on November 9, 2010
  16. math

    A culture starts with 8300 bacteria. After one hour the count is 10,000. (a) Find a function that models the number of bacteria n(t) after t hours. (Round your r value to three decimal places.)

    asked on November 6, 2015
  17. Physics

    1. A 2.5 kg mass at rest on a horizontal surface is acted upon by an applied horizontal force of 150 N. A frictional force of 100 N acts on the mass. How much work is done on the mass after 5 m? I got 250 J but I'm not sure if that's correct. 2. A mass of

    asked on June 17, 2020
  18. Chemistry

    When HCl(aq) is exactly neutralized by NaOH(aq), the hydrogen ion concentration in the resulting mixture is a. always equal than the concentration of the hydroxide ions b.sometimes greater and sometimes less than the concentration of the hydroxide ion c.

    asked on April 20, 2010
  19. Plants

    The closest relatives of the familiar pine and spruce trees are ________. elms, maples, aspens hornworts, liverworts, mosses gnetophytes, cycads, ginkgoes ferns, horsetails, lycophytes, club mosses

    asked on September 22, 2009
  20. Physics

    A rock is projected from the edge of the top of a building with an initial velocity of 19.6 m/s at an angle of 31 degrees above the horizontal. The rock strikes the ground a horizontal distance of 77 m from the base of the building. The acceleration of

    asked on November 1, 2011
  21. Physics

    A trap door, of length and width 1.65 m, is held open at an angle of 65.0 degrees with respect to the floor. A rope is attached to the raised edge of the door and fastened to the wall behind the door in such a position that the rope pulls perpendicularly

    asked on April 27, 2011
  22. Physics

    Three point charges are arranged along the x axis: q1 = −4.43 nC at x1 = 199 mm, q2 = 2.33 nC at x2 = -302 mm, and a positive charge q3 at the origin. What is the value of q3 if the net force on this point charge has magnitude 4.50 µL?

    asked on February 16, 2008
  23. Chemistry

    need to calculate percent yield of MgNH4PO4 . 6H2O obtained in my experiment using 10-52-10 plant food label as a guide to determine the theoretical yield of MgNH4PO4 . 6H2O. My calculations so far: air dry weight of MgNH4PO4 . 6H2O = 2.30 g Grams of

    asked on May 27, 2011
  24. math

    At Frugal Foods a loaf of bread cost about $1 in 1980. In 2013, the loaf of bread cost $2.50. 1.A ratio is a comparison of two amounts by division. What is the ratio of the cost of a loaf of bread in 2013 to the cost in 1980? *$2.50/1 2.Assuming the price

    asked on May 13, 2015
  25. calculus

    The volume of a cube is increased from 729 cubic centimetres to 849.285 cubic centimetres. Use differentials to determine: a) by approximately how many centimetres the side length of the cube increases ? B) by approximately how many square centimetres does

    asked on October 12, 2014
  26. chem

    well it saids: A 1.50L rubber balloon is filled with carbon dioxide gas at a temperature of 0.00C and a pressure of 1.00 atm. the density of the carbon dioxide gas under these conditions is 1.98g/L. a)at 50.0C the balloon ha a vlomue of 1.78L. Calculate

    asked on November 14, 2010
  27. chem

    in the following total ionic equation, which ions are spectator ions? Cu2+ (aq) + 2NO3-(aq)+2Na+(aq)+S2-(aq)--->CuS(s)+2NO3-(aq)+2Na+(aq)

    asked on November 9, 2010
  28. Calculus

    A 10 foot ladder leans against a 20 foot wall. Someone begins pushing the base of the ladder toward the wall at the rate of one foot per second. How quickly is the top of the ladder moving up the wall after 2 seconds?

    asked on May 6, 2010
  29. physics

    A car is driven 125km west and 65km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?

    asked on October 20, 2008
  30. math

    Christie pilots her plane for 360 mi against a headwind in 33 hrs. The flight would take 22 hrs and 15 mins with a tailwind of the same speed. Find the headwind and the speed of the plane in still air.

    asked on October 16, 2016
  31. calculus

    Use l'hopital's Rule to evaluate lim x in 0 of (4x(cos 6x-1 )) / sin 3x-3x

    asked on November 8, 2014
  32. chemistry

    How many moles of carbon, hydrogen, and oxygen are present in a 100g sample of ascorbic acid?

    asked on October 4, 2011
  33. Geometry

    I need to find surface area of triangular prism-dimension of base is 9.9 by 6.2 distance between bases is 14.6 choices are: 436.278 466.97 332.94 253.46 Thank you

    asked on May 3, 2010
  34. Physics

    A battery of e.m.f. 6.0 V, and internal resistance 1.0 ohms is connected to a resistor and drives a current of 125 mA through it. What is the resistance of the resistor? Thank you!!

    asked on March 3, 2019
  35. math

    2.If a sledgehammer that weighs 18 newtons on Earth will weigh about 4 newtons on the planet Namar, then your weight on Namar would be about ___ times your weight on Earth. A. 0.25 B. 4 C. 0.5 D. Not enough information

    asked on May 14, 2015
  36. math

    You are putting a brick walkway along two sides of a rectangular garden that measures 6 meters by 15 meters. The path will run the length of the garden, turn the corner, and run along the width. You only have enough brick to cover 46 square meters. How

    asked on February 4, 2014
  37. Math 6th Grade Level

    A baker bought 680,000 oz. of flour and packed the flour into 200 bags of equal size. He used some flour and had 100 bags left. He decided to repack the remaining flour bags into bags of 5,000 oz. bags. How many bags of flour did he have in the end?

    asked on June 19, 2013
  38. chemistry

    How many moles of SO2 are required to make 125 mol CS2 How many moles of carbon monoxide form at the same time that 0.255 mol CS2 forms? THANK YOU

    asked on March 31, 2010
  39. science

    At Frugal Foods a loaf of bread cost about $1 in 1980. In 2013, the loaf of bread cost $2.50 1. A ratio is a comparison of two amounts by division. What is the ratio of the cost of a loaf of bread in 2013 to the cost in 1980? 2. Assuming the price of

    asked on October 9, 2019
  40. Chemistry

    2NO(g) + O2 (g) --> 2NO2 How many grams of NO are required to react fully with 5.00 mol of O2? I do not understand any of this please help

    asked on October 4, 2016
  41. Trig

    the angle of elevation to the sun is 65 degrees. A building casts a shadow 16m long. What is the height of the building to the nearest meter?

    asked on November 17, 2014
  42. finance

    Mrs. Kay who is 24 years old plans to retire at the age of 60. Mrs. Kay would like to be able to withdraw $120,000 per year from her retirement account for 40 years after retirement beginning a year after her retirement. She already has $15,000 in her

    asked on April 17, 2013
  43. physics

    A particle starts from the origin at t = 0 with an initial velocity of 5.5 m/s along the positive x axis.If the acceleration is (-2.8i + 4.1jm/s^2, determine (a)the velocity and (b)position of the particle at the moment it reaches its maximum x coordinate.

    asked on October 16, 2011
  44. Chemistry

    Use the following information to identify element A and come pound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of 659.452 g after it has been filled with nitrogen gas at a pressure of 790. torr and a

    asked on March 29, 2007
  45. Chemistry

    In a reaction Mg(s) + 2HCl(aq) → H2(g) + MgCl2(aq), 6.00 g of Mg was present at 0.00 min. After 3.00 min, 4.50 g of Mg remained. Express the average rate as mol of Mg consumed per minute. I was taught how to use molarity but this question does not tell

    asked on April 30, 2017
  46. physics

    In a cathode-ray tube, electrons are projected horizontally at 1.0×10^6 m/s and travel a horizontal distance 11.5 cm across the tube. How long are the electrons in flight? Express your answer to two significant figures and include the appropriate units.

    asked on January 27, 2016
  47. physics

    A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?

    asked on February 10, 2014
  48. Statistics

    Is is possible for the regression equation to have none of the actual (observed) data points located on the regression line?

    asked on December 2, 2012
  49. Physics

    A cylindrical 7.00-kg reel with a radius of 0.60 m and a frictionless axle, starts from rest and speeds up uniformly as a 3.00-kg bucket falls into a well, making a light rope unwind from the reel (Fig. P8.36). The bucket starts from rest and falls for

    asked on April 11, 2012
  50. physics

    Three identical uniform meter sticks are placed on the floor. The first stick lies along the y axis from y = 0.470 m to y = 1.47 m. The second stick lies along the x axis from x = 0.320 m to x = 1.32 m. The third stick is positioned so that one end is on

    asked on March 26, 2012
  51. calculus

    Find the sum of the series 2 + 9/2! + 27/3! + 81/4! . . .

    asked on August 8, 2011
  52. chem

    at 50.0C the balloon ha a vlomue of 1.78L. Calculate the carbon dioxide density at this temperature.

    asked on November 14, 2010
  53. chem

    for a combination reaction, it was calculated that 7.59g of A would exactly react with 4.88g of B. these amounts were reacted, and 9.04g of product was isolated. what was the percentage yield of reaction??

    asked on November 10, 2010
  54. chem

    suppose you had an unknown solution that contained either dissolved NaOH, NaCl< or NaNO3. you add 4 drops of AgNO3 solution to 4drops of the unknown solution and observed that no solid formed. What can be concluded the unknown solution? why?

    asked on November 9, 2010

    A 9.5-kg monkey is hanging by one arm from a branch and is swinging on a vertical circle. As an approximation, assume a radial distance of 80 cm between the branch and the point where the monkey's mass is located. As the monkey swings through the lowest

    asked on October 5, 2010

    A jet flying at 135 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, and the mass of the jet is 1.82*10^5 kg. Calculate the magnitude of the necessary lifting force.

    asked on October 5, 2010
  57. physics

    An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? a) That there is no reaction force-the net force on the object is zero, so the

    asked on November 23, 2009
  58. Economics

    1) The long run growth rate of the economy is consistent with: a.An outward expansion the economy's production possibilities frontier. b.A rightward shift in the aggregate demand curve. c.An inward expansion the economy's production possibilities frontier.

    asked on September 1, 2009
  59. physics!! plz answer me!

    A 0.15 kg baseball moving at +26 m/s is slowed to a stop by a catcher who exerts a constant force of -390 N. How long does it take this force to stop the ball? How far does the ball travel before stopping? plz plz plz help!!

    asked on December 10, 2007
  60. physics

    A 20 kg child on roller skates, initially at rest, rolls 4 m down an incline at an angle of 30 degrees with the horizontal. If there is no friction between incline and skates, what is the kenetic energy of the child at the bottom of the incline? (g= 9.81

    asked on December 5, 2007
  61. Chemistry

    I posted this question on Thursday April 12 and received some help..but need more.. thanks Use the following information to identify element A and come pound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass

    asked on April 16, 2007
  62. Chemistry

    I posted this question a bit ago and received some help..but need more.. thanks Use the following information to identify element A and come pound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of 659.452

    asked on April 12, 2007
  63. math

    the sum of my digits is 15 the product of my digits is 56 I am even my tens place is smaller than my ones place

    asked on June 27, 2020
  64. calculus

    the velocity of a particle moving along the x-axis at any time t>=0 is given by v(t)=cos(pi t)-t(7-2pi) find the acceleration at any time t

    asked on January 12, 2020
  65. Biology

    What is the difference between plant and animal cell division besides Cytokinesis

    asked on December 15, 2019
  66. Journalism

    Where should you include the source attribution for information you have quoted in a article? A) in the lead paragraph of the article B) After the first sentence of quoted material from the source C) At the end of all the material quoted from the source D)

    asked on August 29, 2018
  67. AP Physics

    You're driving down the highway late one night at 18 m/s when a deer steps onto the road 42 m in front of you. Your reaction time before stepping on the brakes is 0.50 s , and the maximum deceleration of your car is 10 m/s2 . A.)How much distance is

    asked on March 29, 2018
  68. chemistry

    I think it is a trick question as I can not balance this equation . Balance this equation Na(CO3)2+H2SO4=NA(SO4)2+H2O+CO2

    asked on November 14, 2017
  69. math

    Georgetown and Franklin are 9.7 in apart on a map that has a scale of 1.1 in : 15 mi. How far apart are the real cities?

    asked on January 31, 2017
  70. Chemistry

    How much heat (in kilojoules) is required to warm 11.0 g of ice, initially at -14.0 ∘C, to steam at 112 ∘C? The heat capacity of ice is 2.09 Jg−1∘C−1 and that of steam is 2.01 Jg−1∘C−1.

    asked on January 30, 2017
  71. Physics

    A 55.0 kg diver steps off a diving board and drops straight down into the water. The water provides an upward average net force 1480 N. If the diver comes to rest 5.6 m below the water's surface, what is the total distance between the diving board and the

    asked on December 5, 2016
  72. Chemistry

    If a solution containing 107.68 g of mercury(II) perchlorate is allowed to react completely with a solution containing 17.796 g of sodium sulfide, how many grams of solid precipitate will be formed?

    asked on October 11, 2016
  73. Chemistry

    B2O3(s) + 3C(s) + 3Cl2 (g) ---> 2 BCl3(g) + 3CO(g) How many moles of chlorine are used up in a reaction that produced 0.35 kg of BCl3 I do not understand please help

    asked on October 4, 2016
  74. Math

    David wants to build a pen for his goat. He wants the area of the pen to be 48 square feet. If the length and width of the pen are whole numbers, which of the following could be the perimeter of the pen? - p = 26 ft - p = 28 ft - p = 30 ft - p = 36 ft

    asked on March 15, 2016
  75. physics

    A batter hits a ball, causing it to leave the bat at 135 m/s and at an angle of 18.3 degrees from the horizontal. If the baseball field is level, and ignoring the height at which the batter hits the ball, how far (horizontally, in meters) away from the

    asked on January 27, 2016
  76. southwest

    5650 is compounded semiannually at 18% for 16 years

    asked on November 11, 2015
  77. physics

    A rock is dropped from a tree of height 22 m into a lake (depth 4.0 m) below. After entering the water, the rock floats gently down through the water at a constant speed of 1.4 m/s to the bottom of the lake. What is the total elapsed time?

    asked on October 4, 2015
  78. Math

    Geddy has a pool with a volume of 25.0m^3. It costs $2.35 per cubic foot (ft^3) to clean. How much will it cost to clean the pool?

    asked on September 22, 2015
  79. chem

    For the reaction: N2+3H2 2NH3 1.000 mol N2 and 1.000 mol H2 are placed in a 1.000 L container and allowed to establish equilibrium. When equilibrium is established the [N2] =0.921M. Calculate the equilibrium concentrations of hydrogen and ammonia.

    asked on April 19, 2015
  80. Chemistry

    I have to use the given concentration of 7.03 micromoles/liters to determine the concentration for the following dilutions. 1. mL stock solution-2 mL distilled water-8 2. mL stock solution-4 mL distilled water-6 3. mL stock solution-6 mL distilled water-4

    asked on February 24, 2015
  81. English

    Identify the simple sentences in the following paragraph. I know the first and third sentences are simple. The air show announcer hushed. He had been squawking all day, and now he quit. The crowd stilled. Even the children watched dumbstruck as the slow,

    asked on February 18, 2015
  82. Chemistry

    the titration of an ascorbic acid requires 18.5 mL of .0105 M KIO3. how many mmol of ascorbic acid were in this sample?

    asked on February 4, 2015
  83. physics

    An electron travels 2.7 m in 6.37 × 10−8 s. How fast is it traveling?

    asked on September 30, 2014
  84. Math

    A hair product company sells three types of hair products for $30, $20, and $10 per unit. In one year, the total revenue for the three products was $800,000, which corresponded to the sale of 40,000 units. The company sold half as many units of the $30

    asked on June 17, 2014
  85. Chemistry

    Explain why methyl red would be a good indicator for a titration of 0.25M NaOH with .025M HNO3, but a poor choice for use in a titration of 0.25M NaOH with 0.25M HCN. I'm pretty sure the first step is to find the pH of the two titrations (and then compare

    asked on May 17, 2014
  86. Math

    There are three hundred students at Mackenzie Middle School in Brain City. If 57% of the students are female, what is the ratio of female students to male students? Answer in lowest terms

    asked on January 1, 2014
  87. Physics

    A train is moving parallel and adjacent to a highway with a constant speed of 27 m/s. Ini- tially a car is 60 m behind the train, traveling in the same direction as the train at 41 m/s and accelerating at 5 m/s2. What is the speed of the car just as it

    asked on October 16, 2013
  88. Algebra 1

    One long-distance telephone company offers a plan such that the first 20 minutes costs $.99 and each additional minute costs $.09. Solve an inequality to find the maximum amount of full minutes you can talk for $5.00. At first I got: 5 is greater than or

    asked on October 14, 2013
  89. physics

    The Easy Bake Oven is a common toy for young children who want to emulate the process of cooking. Suppose this oven is plugged into a 120 V electrical outlet and "cooks" the food by using a 144 ohm resistor light bulb that converts electrical energy to

    asked on May 30, 2013
  90. chemistry

    What is the specific heat of an unknown substance if a 2.31 g sample releases 12.5 cal as its temperature changes from 24.9°C to 20.7°C? Please explain ans show steps.

    asked on April 16, 2013
  91. chemistry

    please help and explain. At a certain temperature, Keq = 10.5 for the equilibrium below. CO(g) + 2 H2(g) equilibrium reaction arrow CH3OH(g) Calculate the following concentrations. (b) [H2] in an equilibrium mixture containing 1.01 mol/L CO and 0.335 mol/L

    asked on March 11, 2013
  92. algebra I

    how do I solve for 16x^2+56x-120

    asked on March 6, 2013
  93. physics

    The launching speed of a certain projectile is 3.0 times the speed it has at its maximum height. Calculate the elevation angle at launching

    asked on February 8, 2013
  94. math

    when a cross tile is placed on a number plane the centre number is the average of al the numbers covered. Explain why

    asked on April 16, 2012
  95. physics

    A student argues that as a satellite orbits the earth in a circular path, it moves with a constant velocity and therefore has no acceleration. The professor claims that the student is wrong since the satellite must have a centripetal acceleration as it

    asked on February 8, 2012
  96. Chemistry

    a coffee cup calorimeter normally consists of two nested styrofoam cups with a lid. a coffee cup calorimeter of this type contains 125.0 g of water at 20.00 degrees C. A 120.0 g sample of copper metal is heated to 98.0 degrees C by putting it into a beaker

    asked on November 30, 2011
  97. Chemistry

    IS THIS RIGHT? Experiments were performed with four metals and solutions of their ions: A-A^+, B-B^2+, C-C^2+, D-D^2+. The results of the experiments were: D^+2 + C ---> No reaction B^+2 + C---> B + C^+2 A^+ + B ---> A + B^+2 a.) Write the equation for

    asked on November 7, 2011
  98. solid mechanics 1

    a load p is supported by a steel pin that has been inserted in a short wooden member hanging from the ceiling. the ultimate strength of the wood used is 60 MPa in tension and 7.5 MPa in shear, while the ultimate strength of the steel is 145 MPa in shear.

    asked on October 7, 2011
  99. English

    1.What figure of speech is this? I think it is personification "Death stands above me, whispering low I know not what into my ear." simile litotes personification metonymy synecdoche 2.What figure of speech is this:The fog comes on little cat feet This one

    asked on September 20, 2011
  100. Chemistry

    How many kilojoules of heat energy are needed to change 49.6 g of ice at 15 degrees celsius to water at 58 degrees celsius? I am having trouble figuring out how to solve this.

    asked on February 22, 2011


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