Most popular questions and responses by Aria
  1. Chemistry

    100 mL of 1.0 M formic acid (HCOOH) is titrated with 1.0 M sodium hydroxide (NaOh). The Approximate pKa is 4 At the pKa, what fraction of the carboxyl group will have been converted to COO-?

    asked on September 27, 2013
  2. Chemistry

    Select the statements that correctly describe buffers.? 1) The pH of a buffer solution does not change significantly when any amount of a strong acid is added. 2) The Ka of a buffer does not change when any amount of an acid is added to the buffer

    asked on September 23, 2013
  3. Math

    Two complementary angles have measures of s and t. If t is less than twice s, which system of linear equations can be used to determine the measure of each angle?

    asked on April 19, 2017
  4. World History

    Which accurately describes the rise of Napoleon Bonaparte’s power to overthrow the French government?

    asked on February 7, 2018
  5. English

    Which of the following is a simple sentence? A. Many are called, but few are chosen B. A penny saved is a penny earned C. Fools rush in where angels fear to tread D. If at first you don’t succeed, try, try again 2. Which of the following is a compound

    asked on October 26, 2017
  6. geometry

    what is the area of a rhombus with a 60 degree angle and sides 5 cm long? (round to the nearest 10th)

    asked on March 29, 2011
  7. Biochemistry

    1. What is the overall charge of the tripeptide below pH 1.0? 2. What is the overall charge of the tripeptide at pH 12? 3. What type of intermolecular attractions could the side chains of the amino acids make with the solvent (water) at pH 7.4? (Note that

    asked on October 5, 2013
  8. Chemistry

    Mole calculations: How much does 2.5 x 10^24 molecules of p2o3 weigh ?

    asked on March 3, 2016
  9. Math

    Decide what values of the variable cannot possibly be solutions for each equation. Do not solve. 2x/x+1 + 3/5x+5=0

    asked on November 8, 2016
  10. Chemistry - Half-life

    Phosphene decomposes to phosphorus and hydrogen in a first order mechanism. 4PH3(g) --> P4(g) + 6H2(g) This reaction's half-life is 35.0 s at 680 degrees C. If you had 520 mmHg of phosphene in an 8.00-L flask, how long does it take for the pressure in the

    asked on April 25, 2012
  11. Science

    If don't mind could you check my answers for environmental science 1.The interdisciplinary study of humanity’s relationship with other organisms and the non-living physical environment is termed: a) ecology b) sociology c) political science d) risk

    asked on October 2, 2017
  12. Science 8

    How are Newton’s second and third laws of motion important to your everyday life? Please help me! I've looked everywhere and I can't seem to find an answer.

    asked on October 8, 2014
  13. Geometry Math

    In designing a circular flower bed where the diameter of the circle is 13 feet​ long, a gardener decides it would look best to space the flowers 7 inches apart. How many flowers will be needed around the outside of the flower​ bed? (I've tried finding

    asked on December 4, 2017
  14. Statistics

    Two of the biggest soft drink rivals, Pepsi and Coke, are very concerned about their market shares. The pie chart that follows claims that PepsiCo's share of the beverage market is 25%. Assume that this proportion will be close to the probability that a

    asked on February 28, 2014
  15. computer

    The field names in a database are also known as A. category or column heading ** B. The name of a row C. Individual cells in a database D. Records Am I right..?

    asked on December 1, 2015
  16. Math

    A new fence is constructed on three sides of a housing block with area 240 m2. The fourth side facing the road is left open. If 52 m of fencing is used, what are the dimensions of the block?

    asked on March 29, 2015
  17. Social Studies

    12. What is one cost that victory in the cold war brought to the united states?

    asked on May 17, 2017
  18. math

    Cohen has consistently averaged 120 yd. of horizontal distance with his 7-iron over the last two years playing golf. His ball flight typically reaches a maximum height of 24 yd. (Hint: A rough sketch will help you) a.) Create a function in vertex form that

    asked on June 5, 2012
  19. Math

    In 7 days, Mario cooked 98 pounds of spaghetti. Each day after the rst, he cooked 2 more pounds than he cooked than the day before. What is the difference between the average (arithmetic mean) number of pounds of spaghetti he cooked per day and the median

    asked on July 28, 2017
  20. Chemistry

    The rock in a particular iron ore deposit contains 84 % Fe2O3 by mass. How many kilograms of the rock must be processed to obtain 1100 kg of iron?

    asked on March 31, 2016
  21. maths

    10 men can build a house in 6 months. How long would it take 3 men?

    asked on September 21, 2018
  22. Science plz help

    Describe how community residents and authorities can prepare for an earthquake and its aftermath. Review earthquake advice from the USGS, the American Red Cross, and other agencies. If you live in an area that is susceptible to earthquakes, include

    asked on November 30, 2015
  23. chemistry

    Propionic acid has a ka of 1.3x10^(-5), 50.0ml of a buffer solution having a pH of 4.65 is to be prepared using a 0.20 M solutions of propionic acid and sodium propionate. How many ml of each of these solutions must be mixed? Thanks in Advanced !

    asked on April 16, 2014
  24. Chemistry

    Consider the generic reaction between reactants A and B: 3A+4B→2C How many moles of B will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.)

    asked on April 29, 2016
  25. Math

    Aubrey can run at a pace of 6 miles per hour. Running at the same rate, how many miles can she run in 90 minutes?

    asked on July 31, 2017
  26. Statistics

    A sample of 50 values produced the following summary statistics: Q1 = 10, Q2 = 14.6, Q3 = 16.7 and x = 15.3. Based on this information, the left and right ends of the box in a box and whisker plot are, respectively, a. 10 and 14.6 b. 14.6 and 16.7 c. 10

    asked on October 10, 2012
  27. Physics

    A missile is fired with a launch velocity of 15000 ft/s at a target 1200 miles away. At what angle must it be fired to hit the target? how long after it is fired will the target be hit?

    asked on September 24, 2016
  28. Science help

    The length of a football field is 100 yards. When you compare geologic time (4.6 billion years) to the length of a football field, you will find that each yard on the field will equal 46 million years, and each 10-yard section will equal 460 million years.

    asked on November 4, 2015
  29. Programming

    The question is: You have recently been employed by a company that specialises in application development. Your first project is to help them design an application using Python that will help shoppers determine which products to buy at the supermarket and

    asked on July 23, 2019
  30. Math

    If current trends of burning fossil fuels and deforestation continue, then future amounts of atmospheric carbon dioxide in parts per million (ppm) will increase exponentially. In the year of 1990, there was 353 ppm. A)In the year of 2000, there was 375 ppm

    asked on March 31, 2017
  31. Science

    How can erosion and deposits form a plain?

    asked on September 16, 2019
  32. Statistics

    The number of traffic accidents per day on a certain section of highway is thought to be Poisson distributed with a mean equal 2.19. Based on this, how many traffic accidents should be expected during a week long period? a. 15.33 b. 10.95 c. approximately

    asked on October 10, 2012
  33. Math

    Find the coefficient of x^4y^3 in the expansion of (x+2y)^7

    asked on June 2, 2017
  34. 6th grade history

    Where did the mound builders live???

    asked on May 19, 2012
  35. Physics

    A 0.22 calibre rifle shoots a bullet of mass 1.8 g with a muzzle velocity of 500 m/s. If the barrel is 25 cm long, what is the average force exerted on the bullet while it is in the barrel?

    asked on June 22, 2012
  36. math

    Oceanographers use a quantity known as shoreline development to describe and categorize bodies of water. Shoreline development, D, measures how closely a body of water resembles a circle. Its formula is: where L is the shoreline length and A is the area of

    asked on February 5, 2017
  37. Chemistry

    A sample of propane, C3H8, contains 10.0 moles of carbon atoms. How many total moles of atoms does the sample contain? Express the total number of moles of carbon and hydrogen numerically.

    asked on March 30, 2016
  38. chemisrty

    A solid acid is dissolved in enough water to make 200 ml of a solution. 40.0ml of the solution is titrated to a phenolphthalein en point with an NaOH solution. The neutralized solution and the remainder of the acid solution are then mixed and the PH of the

    asked on April 16, 2014
  39. Math

    Two consecutive integers are squared. The sum of these squares of these squares is 545. What are the integers?

    asked on June 5, 2012
  40. English

    The climax of “Rikki-tiki-tavi” occurs when

    asked on September 9, 2019
  41. Statistics

    Let X be a binomial random variable with n = 100 and p = 0.2. Find approximations to these probabilities. (Round your answers to four decimal places.) P(17 < X < 28) I get the answer as 0.7059 but it is wrong. I can't seem to figure this out... Help please

    asked on February 27, 2014
  42. Math

    Dividing complex numbers 7-13i/2i

    asked on October 8, 2016
  43. Math

    During an epidemic, the number of people who have never had the disease and who are not immune (they are susceptible) decreases exponentially according to the function where t is time in days. f(t)=15,000e^-.05t Determine how long it will take for the

    asked on March 28, 2017
  44. English

    Identify the novel's point of view and discuss the effect of any significant shifts in the narrative voice. In other words, when does the protagonist's point of view change within the novel and why is it important. Novel is called The Awakening by kate

    asked on September 2, 2017
  45. Math

    An open-topped box is constructed from a piece of cardboard with a length 2 cm longer than its width. A 6 cm square is cut from each corner and the flaps turned up from the sides of the box. If the volume of the box is 4050 cm3 , find the dimensions of the

    asked on March 24, 2015
  46. Math

    Decide what values of the variable cannot possibly be solutions for each equation. Do not solve. 2/x+3 - 5/x-1= -5/x^2+2x-3

    asked on November 8, 2016
  47. Environmental science

    Assume the biomass of the organism at the bottom of the trophic is 5,000 lbs. predict the approximate mass of each of the remaining levels, explain why the mass is changing.

    asked on September 24, 2017
  48. Check answers

    Environmental science Explain why the energy pyramind levels change in size? There is not enough energy to support the organisms that are higher up in the energy pyramid because too much energy gets lost. What is the ultimate source of energy for most food

    asked on September 13, 2017
  49. Math

    Find the vertex H(x)= -3x^2+24x-46

    asked on January 8, 2017
  50. Math

    A bridge over a river is supported by an arch. The function that describes the arch us h(x) = -0.0274x^2 + 1.34033x, where h(x) is the height, in metres, of the arch above the water at any distance, x, in metres, from one end of the bridge. Could a sail

    asked on June 5, 2012
  51. Physics question

    A box of mass 25kg is sitting on a horizontal plane and has a normal force pointing down of 31N, and the coeff of kinetic and static friction between the box and floor are .22 and .38, respectively. What is the min horizontal force F needed to make the box

    asked on October 2, 2017
  52. chemistry

    Bicine is an amino acid, but not a building block of proteins. Rather, it is a reagent commonly used in the biochemistry laboratory. Bicine contains two ionizable groups: tertiary amine (pKa 8.3) and carboxyl (pKa 2.3) a. For each of the ionizable groups

    asked on September 23, 2016
  53. English

    The scarlet letter "dark and abundant hair, so glossy that it threw off the sunshine with a gleam" "her beauty shone out, and made a halo of the misfortune and ignominy in which she was enveloped." Fine at least 2 phrases that describe the physical nature

    asked on December 1, 2016
  54. Math

    The square root of 1 less than twice a number is equal to 2 less than the number.Find the number.

    asked on November 9, 2016
  55. 6 grade math

    Erin buys a bag of peanuts that weighs of 3/4 of a pound. Later that week, the bag is 2/3 full. How much does the bag of peanuts weigh now?

    asked on August 27, 2015
  56. Chemistry

    If you mix 20.0 mL of 1.00 x 10-4 mol/L NaCl with 20.0 mL of 2.00 x 10-6 mol/L AgNO3 will a precipitate form ? If it does it will be AgCl, which has a Ksp of 1.80 x 10-10. i'm not quite sure how to figure this out...

    asked on February 21, 2012
  57. algebra

    how do you find the square root of any number with long division and not a calculator? I don't like calculator readings. They are not always easy to figure out, plus math principles can't be learned with a calculator.

    asked on April 16, 2011
  58. geometry

    what is the area of a rhombus with a 60 degree angle and sides 5 cm long? (round to the nearest 10th)

    asked on March 29, 2011
  59. Math

    Arithmetic sequence: For a8 and an for the sequence: -3,-7,-11 My answer a8=33

    asked on May 15, 2017
  60. chemistry

    Balance each of the following redox equations using the half-reaction method. HI(s) + H2SO4 (aq) --> H2S(g) + I2 (s) My only question about this equation do I know how many electrons I need to put on both sides? Other than that I know how to do

    asked on February 25, 2012
  61. history

    Evaluate the effectiveness of nixon's solution. was it successful? how do you determine this?

    asked on May 12, 2016
  62. English

    Take a position that explains if, and to what degree, modern American culture is an outgrowth of the philosophies of the Founding Fathers. I agree that American culture is an outgrowth of the philosphies of the founding fathers. I have one reason and that

    asked on February 27, 2017
  63. World history

    What were the effects of cultural diffusion on ancient Africa empires ? Is it because the three main kingdoms maintained vast trading networks across Sahara desert and into the the Middle East and North Africa

    asked on June 8, 2016
  64. Poem

    She was a Phantom of delight When first she gleamed upon my sight; A lovely Apparition, sent To be a moment's ornament; Her eyes as stars of Twilight fair; [5] Like Twilight's, too, her dusky hair; But all things else about her drawn From May-time and the

    asked on May 2, 2011
  65. algebra

    Problem Two: 5/9 + (2/9)x = 25/7 + (6/7)x – 2/3 Multiply figures inside parentheses 5/9 + (1 x 2/9x) = 25/7 + (1 x 6/7x) – 2/3 Collect like signs 5/9 + 2/9(6/7x) = 25/7 + (-2/3) Multiply like signs 2 x 6 9 7 Reduce like numbers 2 x 2 = 4x 3 7 21x

    asked on April 28, 2011
  66. Algebra

    I was given this problem to solve and no matter what order I multiply the variables I don't get the right answer. 27xy, when x=12.7 and y=100.4 the answer is 34,427.16 I cannot figure out the way to achieve this answer. I find problems with variable fairly

    asked on April 15, 2011
  67. Anatomy

    What consequence would an over abundance of acetylcholine have both overall and at the molecular level of the muscle?

    asked on February 22, 2017
  68. chemistry

    You discovered a new diprotic acid, which you have named edmontonic acid. You want to characterize the pKa’s of edmontonic acid, so you perform a titration experiment. Your data are summarized in the table below. Your titration sample contains 150 mmol

    asked on September 23, 2016
  69. World history

    How did Ghana, Mali, and Songhai get so advanced ?

    asked on December 17, 2015
  70. Calculus

    Differentiate x^2y^3+x^3y^4=11 implicitly to find dy/dx.

    asked on June 5, 2012
  71. Chemistry

    Explain, using collision theory, the effect of decreasing temperature on the rate of a chemical reaction. Explain, using collision theory, the effect of increasing concentration on the rate of a chemical reaction. Explain, using collision theory, the

    asked on February 21, 2012
  72. Algebra

    Could anybody help me with these two problems, or at least the 1st one? Thank you very much. „« The measure of the third angle of a triangle is 38 degrees more than the second angle. The measure of the first angle is two less than twice the second

    asked on May 16, 2011
  73. Math

    A certain type of bacteria is growing at an exponential rate that can be modeled by the equation y=ae^kt, where t represents the number of hours. There are 300 bacteria initially, and 1500 bacteria 5 hours later. Find the rate of growth, k, of the

    asked on June 4, 2017
  74. Math

    Geometric series: Finite and infinite n=5 a1=243 r=2/3 i=1 This is the equation 243(2/3)^i My answer is 633 n=infinity sign a1=5 r=-1/4 i=1 The equation 5(-1/4)^i-1 I think its undefined

    asked on June 1, 2017
  75. Math

    Arithmetic sequences Find a8 and an for the sequence: -3, -7,-11

    asked on June 1, 2017
  76. English

    Express how the device below and structure helps acheive the purpose of chapter 4. The book is called Narrative Of The Life Of Fredrick Douglass. I just need to write a paragraph. given: brutality of slavery device: diction and structure All i know is for

    asked on January 29, 2017
  77. English

    Chapter 2 of the scarlet letter What does this tell you about the puritan people? "there appeared, in the first place, like a black shadow emerging into the sunshine, the grim and grisly presence of the town-beadle, with a sword by his side and his staff

    asked on December 4, 2016
  78. Math

    If 4

    asked on November 3, 2016
  79. chemistry

    In a titration of malic acid, what is the pH after: a. 0.75 molar equivalents of NaOH have been added? 1 b. 1.30 molar equivalents of NaOH have been added?

    asked on September 23, 2016
  80. Social Studies

    What did Frederick Douglass, and Andrew Jackson say about their hopes for the future of the United States? How did they each work to help change the United States? How did they each react to key events happening in the United States? Were there any key

    asked on May 16, 2016
  81. Math

    What angle in the first quadrant could you reference to help you find sine and cosine of each of the following angles ? 330 120 113 203

    asked on April 12, 2016
  82. Chemistry

    Using the reaction and the E∘ given below 2Co^3+(aq)+2Cl^−(aq)→2Co^2+(aq)+Cl2(g) E∘=0.46 V what is the cell potential at 25 ∘C if the concentration are [Co^3+]= 0.565M , [Co^2+]= 0.554M , and [Cl^−]= 0.838M and the pressure of Cl2 is PCl2=

    asked on June 21, 2013
  83. algebra

    I have a question about exponents of rational expressions. I have two answers for one problem. One was written on a university mathlab and the other from a calculator. (3a^3/2)*(-7a^1/5) = -21a^17/10 (3a^3/2)*(-7a^1/5) = -21^a4/10 Can you tell me which is

    asked on August 5, 2011
  84. physics

    How much heat does it take to warm up a 300g glass of water by 30 degrees C? (what is the formula for the specific heat of water?)

    asked on March 21, 2011
  85. Algebra 2

    Part A: For what real values of c is x^2 + 16x + c the square of a binomial? If you find more than one, then list your values separated by commas. Part B: For what real values of a is x^2 + ax + 25 the square of a binomial? If you find more than one, then

    asked on October 7, 2017
  86. Science

    Say you had a pond that initial had 30 fish. There was 3 fisherman collecting at least 2 fish to feed their family, They fish for 3 seasons ? At the end of the day you would double the fish whatever you had left. $5 a fish What happened to amount of food

    asked on September 17, 2017
  87. Math

    A certain type of bacteria is growing at an exponential rate that can be modeled by the equation y=ae^kt, where t represents the number of hours. There are 300 bacteria initially, and 1500 bacteria 5 hours later. How many bacteria will be present at time

    asked on June 6, 2017
  88. Math

    Shania bought a new computer for 1,550 from computer 'r' us. If the value of the computer depreciates at a rate of 5.35%per year, when will the value of the computer reach 825 ?

    asked on March 31, 2017
  89. Chemistry

    The efficacy of certain drugs is affected by pH. Many drugs are absorbed into the blood through cells lining the stomach or the small intestine by direct diffusion across the plasma membrane. Since the interior of the plasma membrane is hydrophobic,

    asked on September 23, 2016
  90. Social Studies

    Which of the plans is best for the nation? In what ways is the plan best for African Americans? In what ways is the plan best for former Confederates? In what ways is the plan best for the nation’s future? Explain why the other two plans would not work.

    asked on May 16, 2016
  91. World history

    How did Ghana, Mali, and Songhai get so advanced? The main export was gold, which made each kingdom wealthy and strong, and provided them with the conditions necessary for cultural and intellectual achievement. Is this the answer??

    asked on December 17, 2015
  92. Algebra 2

    The cows at the evaleen dairy produce enough milk to fill a 4800 gallon tanker truck each day. The milk is then hauled to processing plant where it is put into smaller storage containers and then used to fill gallon jugs that are delivered to local stores.

    asked on October 25, 2015
  93. Physics

    I don't really know where to start on the problem. Would I use V = k(q/r)? But what would I do afterwards. Much explanation on how to go about the problem is much appreciated. Thank you. 1) Three point charges are arranged at the corner of a square of side

    asked on February 8, 2015
  94. Calculus

    Hello, I really need help on these two homework problem. >< In problem #1, I believe it is related to the exponential functions and their derivatives Calculus II? So, surely there should be a ln in the solution as well? I would like a step by

    asked on January 31, 2015
  95. Algebra

    I am stumped by these two LCM questions for some reason. Find The LCM for #1 2(R-7) and 14(R-7) #2 (1+4r), (1-16r^2), and (1-4r) It seems like #1 is already at the LCM and #2 would be (1+4r)(1-4r) Am I even vaguely correct? Thanks for your help.

    asked on August 2, 2011
  96. Algebra

    If the profit equation for the monthly sales of tile sets is P = -x^2 + 56x - 300, how do I find the number of tiles that yeilds the most profit. x=number of tile sets. The amount of money for costs each month is set at $300. I saw an answer as 28 tile

    asked on July 20, 2011
  97. vocabulary

    what is self delusion? the definitions online are very confusing..Can someone explain it to me in simpler terms. Also would depression be a form of self delusion?

    asked on May 2, 2011
  98. EPI

    I need help finding a principle of economics. The principal is people choose. The text is called "Why we're still fighting the civil war " by David Von Drehle. Time Magazine has the article. My answer is "Abraham Lincoln said that a single issue dividing

    asked on September 12, 2017
  99. Math

    If 2x=5, 3y=4, and 4z=3, what is the value of 24xyz ?

    asked on August 1, 2017
  100. Math

    If the following function was transformed to g(x-2)+3, find g(2)

    asked on June 6, 2017


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