Most popular questions and responses by Katie
  1. SS Check Answers

    1. What value in American identity is most fundamental to the U.S. political system? A. indivual rights B. social conformity C. national security D. freedom from rule 2. Why was the Voting Rights Act of 1965 necessary A. Each citezen must be ruled by the

    asked on November 2, 2016
  2. chemistry

    Write the balanced chemical equation for each of these reactions. Include phases. When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms. However, when additional aqueous hydroxide is added the

    asked on February 13, 2012
  3. Math

    Find the volume of the rectangular prism. A- 23in^3 B- 297in^3 C- 318in^3 D- 159in^3 Please help and the numbers H- 3 l- 9 w-11

    asked on January 24, 2018
  4. Physics

    You want to use a rope to pull a 12-kg box of books up a plane inclined 30∘ above the horizontal. The coefficient of kinetic friction is 0.29. The rope pulls parallel to the incline. What force do you need to exert on the rope if you want to pull the box

    asked on September 30, 2014
  5. chemistry

    Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant. For example, the residual pressure in a can is 1.36 atm when it is

    asked on December 6, 2009
  6. Chemistry

    a) How many moles of atoms are in 7.00 g of 13C? Answer "0.538" mol 13C b) Based on your answer in Part A, calculate the number of atoms in this amount of 13C? Answer "3.24×10^23" 13C atom c) Based on your answer in Part B, how many electrons are in this

    asked on August 25, 2018
  7. chemistry

    Calculate the standard free-energy change for the following reaction at 25 °C. 2Au^3+(aq) + 3Ni(s) -->2Au(s) + 3Ni^2+(aq)

    asked on February 29, 2012
  8. physics

    a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s?

    asked on March 30, 2014
  9. chemistry

    What is the pH of a 2.8 M solution of HClO4?

    asked on January 22, 2012
  10. chemistry

    At 25 °C only 0.0580 mol of the generic salt AB3 is soluble in 1.00 L of water. What is the Ksp of the salt at 25 °C?

    asked on February 13, 2012
  11. Chemistry

    The FDA recommends that women who are pregnant avoid eating more than three 6.00-oz servings of bluefish per month because of the relatively high mercury levels in that type of fish. If bluefish contains 0.341 ppm of mercury (that is, 0.341 oz of mercury

    asked on February 1, 2014
  12. chemistry

    The rate constant for this first-order reaction is 0.320 s–1 at 400 °C. A--> Products How long (in seconds) would it take for the concentration of A to decrease from 0.830 M to 0.220 M?

    asked on March 23, 2012
  13. Chemistry

    Which of the following set of quantum numbers (ordered n, ℓ, mℓ, ms) are possible for an electron in an atom? Check all that apply. -4, 3, 1, 1/2 2, 1, -2, 1/2 4, 2, 1, -1/2 4, 2, -1, -1/2 2, 4, 1, -1/2 5, 3, -3, 1/2 5, 3, 4, 1/2 3, 2, 0, -2

    asked on October 11, 2018
  14. Chemistry

    A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of m = 1.90 fg (where a femtogram, fg, is 10−15g) and is swimming at a velocity of v = 2.00 μm/s , with an uncertainty in the velocity of 3.00 % . E. coli

    asked on October 18, 2018
  15. Help? Math

    Use equal intervals to make a frequency table for the average number of movies per person. You do not need to show tally marks. Country Average Number of Movies Turkey 0.5 Japan 1.2 UK 1.3 Finland 1.3 Austria 1.5 Germany 1.8 Spain 2.2 Sweden 2.2 Denmark

    asked on April 4, 2013
  16. Physics

    A small wooden block with mass 0.800kg is suspended from the lower end of a light cord that is 1.52m long. The block is initially at rest. A bullet with mass 0.0126kg is fired at the block with a horizontal velocity v0. The bullet strikes the block and

    asked on March 12, 2015
  17. physics

    A 120 N child is in a swing that is attached to ropes 2.20 m long. Find the gravitational potential energy of the child-Earth system relative to the child's lowest position at the following times. (a) when the ropes are horizontal (b) when the ropes make a

    asked on October 18, 2010
  18. math

    What is the period, in seconds, of a simple pendulum of length 3 meters? Use the gravitational constant g = 9.8 m/s2 and round your answer to two decimal places Please help! A step by step would with the answer would be helpful!

    asked on June 9, 2014
  19. college physics

    tennis ball rolls off the edge of a tabletop 0.900m above the floor and strikes the floor at a point 1.60m horizontally from the edge of the table. A: Find the time of flight of the ball B: Find the magnitude of the initial velocity of the ball. C: Find

    asked on September 22, 2014
  20. physics

    modern oil tankers weigh more than a half-million tons and have lengths of up to one-fourth mile. Such massive ships require a distance of 5.0 km (about 3.0 mi) and a time of 20 min to come to a stop from a top speed of 30 km/h. What is the magnitude of a

    asked on March 30, 2014
  21. College Chemistry

    Calculate the ratio of NaF to HF required to create a buffer with pH=3.95. Also, can you please explain in a nutshell the whole concept of buffers? Thanks!

    asked on March 23, 2010
  22. chemistry

    How many outer-shell d electrons are there in each of the following transition-metal ions? Re(III) Sc(III) Ru(IV) Hg(II)

    asked on March 30, 2012
  23. Math

    Use equal intervals to make a frequency table for the average number of movies per person. You do not need to show tally marks. Country Average Number of Movies Turkey 0.5 Japan 1.2 UK 1.3 Finland 1.3 Austria 1.5 Germany 1.8 Spain 2.2 Sweden 2.2 Denmark

    asked on April 4, 2013
  24. chemistry

    Which of the following will be more soluble in an acidic solution than in pure water? AgBr Be(OH)2 RbClO4 CaCO3 PbSO4

    asked on February 13, 2012
  25. chemistry

    Rank these species by their ability to act as an oxidizing agent. Na^+ I2 Cr^3+ F2 Put best oxidizing agent first and continue to have best reducing agent last.

    asked on February 29, 2012
  26. Calculus

    An energy drink container in the shape of a right circular cylinder must have a volume of 12 fluid ounces (1 fluid ounce is approximately 1.80469 cubic inches). The cost per square inch of constructing the top and bottom is twice the cost of constructing

    asked on April 10, 2016
  27. Physics

    An Alaskan rescue plane traveling 36 m/s drops a package of emergency rations from a height of 137 m to a stranded party of explorers.Where does the package strike the ground relative to the point directly below where it was released

    asked on November 3, 2011
  28. Math

    you have four $1 bills, two $5 bills, five $10 bills, and five $ 20 bills in your wallet. You select a bill at random. Without replacing the bill, you choose a second bill. What is P($1, then$ 10)?

    asked on April 22, 2015
  29. language arts

    Which of the following passages from Johnny tremain is most useful in helping you determine what type of ruler general gage is? Select all that apply A. Sam Adams was so happy his hands shook worse then ever B. He was not brilliant but he was no tyrant C.

    asked on December 18, 2014
  30. chemistry

    Construct the octahedral crystal-field splitting diagram for the metal in each species. Cr4+ Mn(H2O)6^2+

    asked on March 30, 2012
  31. chemistry

    The reaction described by this equation O3(g) + NO(g) -- O2(g) + NO2(g) has the following rate law at 310 K. rate of reaction = 3.0x10^6 M^-1 s^-1)[O3][NO] Given that [O3]=2.0× 10–4 M and [NO]=2.0× 10–5 M at t=0, calculate the rate of the reaction at

    asked on March 23, 2012
  32. Math

    The bases on a baseball diamond are 27.4m apart. The pitcher pitches,and the batter hits a fly ball straight up 15m. What is the maximum angle of elevation of the ball to the nearest degree, as seen by the pitcher if he is standing at the center of the

    asked on November 28, 2016
  33. physics

    a student drops an object out the window of the top floor of a high-rise dormitory a) neglecting air resistance, how fast is the object traveling when it strikes the ground at the end of 3.0 s? express the speed in mi/h for a familiar comparison, b) how

    asked on March 30, 2014
  34. Math

    A spinner has 4 equal sections: red, white, blue, and green. john spins the spinner and tosses a coin. which shows the sample space for spinning the spinner and tossing the coin? I have a chart but I cant figure out how to get into this question.

    asked on March 12, 2019
  35. SS Check Work

    Asha lives in a nation that has a legislature and a prime minister. Citizens in her country vote in elections to elect their legislative representatives. Then parliament appoints the prime minister. 1. Does Asha's nation have a limited or an unlimited

    asked on November 2, 2016
  36. Math

    What do you get when you cross a porcupine with a gopher?

    asked on April 15, 2008
  37. science

    If Faraday hd used a more powerful battery in his experiments with electromagnetic induction, what affect would this have had on his galvanometer's measurements of current when the battery was fully connected? explain your reasoning. Thanks again!

    asked on May 16, 2016
  38. chemistry

    Give the chemical formula for trans-dichlorobis(ethylenediamine)platinum(IV). Use (en) as the symbol for ethylenediamine.

    asked on March 30, 2012
  39. Physics

    The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a total distance of 10.0 cm, what is its maximum speed when the engine is running at 3 000 rpm? The answer is 15.7 m/s but I don't

    asked on July 9, 2010
  40. Science

    A 10.0kg animal is running at a rate of 3.0m/s what is the kinetic energy of the animal?

    asked on January 11, 2019
  41. MATH

    a pile of bricks has 85 bricks in the bottom row, 79 bricks in the second row, 73 in the third row, and so on until there is only 1 brick in the top row. how many bricks are in the 12th row? how many rows are there in all?

    asked on October 31, 2011
  42. chemistry

    A solution of NaOH(aq) contains 6.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

    asked on January 22, 2012
  43. college Physics

    A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby

    asked on January 29, 2010
  44. Statistics

    A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizzas. The owner of the store has determined that home delivery will be successful if the average time spent on the deliveries does not exceed 30 minutes. The

    asked on November 8, 2013
  45. physics

    A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.3 later. If the speed of sound is 340 , how high is the cliff?

    asked on September 17, 2010
  46. Trigonometry

    If sin(x) = 4cos(x), then what is (sin(x))*(cos (x))?

    asked on April 4, 2016
  47. Advanced Physics

    If wind blows at a speed of 30 m/s over the roof of your house, what is the pressure diference on your roof between the air inside and the air outside? What net force does this produce on a roof having an area of 175 m^2? 1.3 kg/m^3 is the density of air.

    asked on December 5, 2010
  48. Physics

    How long will it take a charged 80-ìF capacitor to lose 20 percent of its initial energy when it is allowed to discharge through a 45 ohm resistor?

    asked on May 22, 2011
  49. Physics

    Determine the magnitude of the gravitational force Mars would exert on man if he was on the surface of Mars. The mass of the man is 69.0kg . The mass of the Mars is 6.42×1023kg and its radius is 3396 km.

    asked on January 12, 2015
  50. chemistry

    Which of these ions have five d electrons in the outermost d subshell? Mn2+ Fe2+ Re2+ Y2+ Tc2+ Zn2+ Ru2+

    asked on March 30, 2012
  51. Chemistry

    A solution contains 0.133 g of dissolved Lead. How many moles of soduim chloride must be added to the solution to completly precipitate all of the disolved lead? What mass of sodium chloride must be added?

    asked on May 14, 2011
  52. math

    Write an equation with a variable on both sides of the equal sign that has infinitely many solutions. Solve the equation and explain why it has an infinite number of solutions. I have no idea?

    asked on December 17, 2015
  53. Chemistry

    Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 14.5g . 1.) What minimum mass of H2SO4 would you need? 2.)What mass of H2

    asked on March 29, 2015
  54. Chemistry

    Suppose 3.50g of zinc bromide is dissolved in 300.mL of a 65.0mM aqueous solution of potassium carbonate. Calculate the final molarity of bromide anion in the solution. You can assume the volume of the solution doesn't change when the zinc bromide is

    asked on December 17, 2018
  55. chemistry

    Which of these ions have one d electron in the outmost d subshell? Zn2+ Fe2+ y2+ Cd2+ Sc2+ Hg2+ Tc2+

    asked on March 30, 2012

    Asha lives in a nation that has a legislature and a prime minister. Citizens in her country vote in elections to elect their legislative representatives. Then parliament appoints the prime minister. 1. Does Asha's nation have a limited or an unlimited

    asked on November 2, 2016
  57. World History

    Which option most accurately describes the settlements of Protestant French Huguenots in the New World? huguenots settlements in present-day Caribbean, Florida, and South Carolina were destroyed by the Spanish until they finally settled in present-day

    asked on May 29, 2018
  58. anatomy

    In the body, lever systems involve the interaction of __1__, which provide the force, and __2__, which provide the lever arms. The force is exerted where __3__. The site at which movement occurs in each case is the intervening __4__, which acts as a

    asked on November 22, 2011
  59. world history

    What was the relationship between trade and the spread of the Phoenician alphabet?

    asked on September 15, 2008
  60. Physics

    Update: Planets are not uniform inside. Normally, they are densest at the center and have decreasing density outward toward the surface. Model a spherically symmetric planet, with the same radius as the earth, as having a density that decreases linearly

    asked on April 30, 2015
  61. Chemistry

    Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 16.2 g of ethane is mixed with 19. g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round

    asked on April 10, 2015
  62. Algebra

    The yearly per capita consumption of whole milk in the United States reached a peak of 40 gallons in 1945, at the end of World War II. By 1970 consumption was only 27.4 gallons per person. It has been steadily decreasing since 1970 at a rate of about 3.9%

    asked on April 9, 2017
  63. Calc

    A 100 inch piece of wire is divided into 2 pieces and each piece is bent into a square. How should this be done in order of minimize the sum of the areas of the 2 squares? a) express the sum of the areas of the squares in terms of the lengths of x and y of

    asked on November 16, 2010

    Sally Sue, an enthusiastic physics student enjoyed the opportunity to collect data from standing waves in a spring. She and her partner help the ends of their spring 4.00 meters apart. There are 5 nodes in the standing wave produced. Sally moved her hand

    asked on April 19, 2011
  65. Calculus

    Two trucks start from the same point. One truck travels due east at a rate of 50 mph and the other trucks travels due north at a rate of 60 mph. At what rate is the distance between the two vehicles increasing 1 1/2 hours later? I think the answer is 55

    asked on February 6, 2011
  66. College Chem II

    Determine the [H3O+] of a 0.160M solution of benzoic acid.

    asked on March 7, 2010
  67. chemistry

    A galvanic cell consists of an electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode composed of silver in a 1.0 M silver ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 °C.

    asked on February 27, 2012
  68. Algebra

    A rectangular playground is to be fenced off and divided in two by another fence parallel to one side of the playground. 440 feet of fencing is used. Find the dimensions of the playground that maximize the total enclosed area. Remember to reduce any

    asked on February 28, 2016
  69. Physics

    A small block is attached to an ideal spring and is moving in SHM on a horizontal, frictionless surface. When the amplitude of the motion is 0.090m , it takes the block 2.68s to travel from x= 0.090m to x= -0.090m . If the amplitude is doubled, to 0.180m ,

    asked on April 26, 2015
  70. Chemistry

    An office heater puts out 2070 Btus (British thermal units) of energy in the form of heat per hour. Given that 1 Btu = 1.055 kJ, how many megajoules of energy in the form of heat can be produced per year (365 days) by the heater (assume continuous

    asked on February 1, 2014
  71. science

    Circle the term that does not belong in each of the following groupings. 1. HC1 secretion Acetyicholine Histamine Secretin Gastrin 2. Gastric emptying Slowed by fats Enterogastric reflex Solid foods 3. Cephalic phase Reflex phase Intestinal phase

    asked on January 29, 2012
  72. chemistry

    what are the chemical formula for sodium tetrachloroplatinate(II) and tris(ethylenediamine)cobalt(III) bromide

    asked on March 30, 2012
  73. chemistry

    1- A compound is 87.5% nitrogen and 12.5% hydrogen. The molecular weight of the compound is 32 g/mol. Describe the molecule referencing shape, and inter-molecular forces. 2- Gaseous butadiene, C4H6 , reacts with hydrogen gas in the presence of a platinum

    asked on January 6, 2014
  74. chemistry

    Copper(I) ions in aqueous solution react with NH3(aq) according to Cu+(aq) + 2NH3(aq) -->Cu(NH3)2^+ Kf = 6.3x10^10 Calculate the solubility (in g·L–1) of CuBr(s) (Ksp = 6.3× 10–9) in 0.41 M NH3(aq).

    asked on February 13, 2012
  75. Math

    I don't want the answer. I just need the first couple of steps to help me solve. Please. A coin tossed. If heads appears, a spinner that can land on any number from 1 to 4 is spun. If tails appears, a second coin is tossed instead of spinning the spinner.

    asked on March 8, 2019
  76. Trig

    How do I solve the following? sec 3 theta/2 = 2 on the interval 0

    asked on March 14, 2010
  77. math

    Three students from grades 10,11 and 12 were elected to the student council. Grade 10: Tom(T), Sally(s) and Bill(B) Grade 11: Jerry(J),Anne(A)and Connie(C) Grade 12: Dan(D), Martha(M) and Gwen(G) A three member committee is to be formed with one person

    asked on January 30, 2009
  78. Math 9

    2 extension ladders are leaning at the same angle against a vertical wall. The 3 meter ladder reaches 2.4 meters up the wall. How much farther up the wall does the 8 meter ladder reach?

    asked on April 19, 2011
  79. Accounting

    The Account Cycle Bob night opened "The general's favorite Fishing Hole" The fishing camp is open from April through September and attracts many famous college basketball coaches during the off-season. Guests typically register for one week, arriving on

    asked on June 5, 2008
  80. Chem 2

    Propane (C3H8) burns in oxygen to produce carbon dioxide and water vapor. The balance equation for this reaction is C3H8 + 5O2 ----> 4H20 + 3CO2. What volume of carbon dioxide id produced when 2.8 L of oxygen are consumed? Here are the steps for solving

    asked on April 27, 2007
  81. Physics

    What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1000g at a radius arm of 15.0cm?

    asked on June 8, 2010
  82. General Chemistry

    A certain protein was found to have 0.855% zinc by mass. Determine the minimum molecular mass of the protein. How do I go about solving this?

    asked on September 19, 2010
  83. Precalculus

    Let C be a circle that passes through the origin. Show that we can find real numbers s and t such that C is the graph of r = 2s*cos(theta + t) I think that I could start by writing it like R^2=(x-h)^2+(y-k)^2 where R is the radius of the circle, but I

    asked on April 18, 2016
  84. chemistry

    At 25 °C, the equilibrium partial pressures for the following reaction were found to be PA = 6.30 atm, PB = 7.20 atm, PC = 6.40 atm, and PD = 9.10 atm. 2A(g) + 2B(g)-->C(g) + 3D(g) What is the standard change in Gibbs free energy of this reaction at 25

    asked on February 17, 2012
  85. Math

    190 students like the program 135 students think the program is unnecessary 220 students plan on running for student government next year. If a circle graph were made from this data, what would the measure of the central angle be for the group that likes

    asked on April 1, 2013
  86. Algebra 1

    the temperature at noon in los angeles on a summer day was 88 degrees fahrenheit. during the day, the temperature varies from this by as much as 7.5 degrees fahrenheit. write and solve an absolute-value inequality to find the range of possible temperature

    asked on September 11, 2014
  87. chem

    classify each of the following as a lewis acid or base: Cl- BeCl2 B(CH3)3 P(Ch3)3 Cl- is an acid right? i'm not sure i understand this concept very well. :[ and i tried looking at my notes already.

    asked on March 28, 2010
  88. Chemistry

    Mercury and bormine react with each other to produce mercury(II)bromide: Hg + Br2 -> HgBr2 a) What mass of HgBr2 can be produced from the reactiion 10g HG and 9g Br2? [the part that really confuses me] What mass of which reagent is left unreacted? b) What

    asked on October 17, 2010
  89. language Arts

    In the excerpt from Barrio Boy, what makes Ernesto similar to several of his classmates?

    asked on January 25, 2016
  90. literature

    In the Merchant of Venice, What is Shylock’s initial reaction to Launcelot’s leaving his service? I googled it many times, but I couldn't find the answer! Thanks!

    asked on September 22, 2016
  91. Calculus

    A street light is hung 18 ft. above street level. A 6-foot tall man standing directly under the light walks away at a rate of 3 ft/sec. How fast is the tip of the man's shadow moving? I know I would've to set up a proportion. 18 / 6 = x + y / y x =

    asked on February 6, 2011
  92. chemistry

    A galvanic cell consists of an electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode composed of silver in a 1.0 M silver ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 °C.

    asked on February 27, 2012
  93. Math

    Which of the following options results in a graph that shows exponential growth A.f(x)= 0.4(3)^x B.f(x)= 3(0.5)^x C.f(x)= 0.8(0.9)^x D.f(x)= 0.9(5)^-x

    asked on November 4, 2015
  94. Economics

    A $90,000 investment is made. Over a 5 year period, a return of $30,000 occurs at the end of the first year. Each successive year yields a return that is $3,000 less than the previous year's return. If money is worth 5 percent, use a gradient series factor

    asked on February 23, 2013
  95. Physics Number 3 (Online w/ no teacher)

    Many people mistakenly believe that the astronauts that orbit the Earth are “above gravity.” Calculate g for space-shuttle territory, 200 kilometers above the Earth’s surface. Earths’ mass is 6 X 10 to the 24th and its radius is 6.38 X 10 to the

    asked on October 27, 2008
  96. language arts

    The young woman Lavinia Lyte sat at last and murmured to herself then to Johnny: "I must talk to toy, Jonathan Lyte tremain" Which of the following best explains why Johnny is so surprised by Lavinia Lyte's statement in this passage? a. Lavinia seems

    asked on January 6, 2015
  97. college algebra

    driving along a crowded freeway you notice that it takes a time to go from one mile marker to the next. when you increase your speed by 8.4 mi/hr the time to go one mile decreased by 14 seconds. What was your original speed?

    asked on February 21, 2013
  98. science

    can you inscramble these letters to make 2 words first word 12 letters, 2nd word 5 letters ietnnrncuinvtohte Thank you for using the Jiskha Homework Help Forum again. I answered the first one I saw, which was just before this one!

    asked on April 19, 2007
  99. Calculus

    A particle moves along line segments from the origin to the points (3, 0, 0), (3, 3, 1), (0, 3, 1), and back to the origin under the influence of the force field F(x, y, z) = z2i + 5xyj + 4y2k. I have tried multiple times to solve this problem but the

    asked on December 8, 2014
  100. algebra

    The mean on a Advanced Algebra test was 78 with a standard deviation of 8. If the test scores are normal distributed, find the interval about the mean that contains 99.7% of the scores. Use the empirical rule.

    asked on January 28, 2015


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