Popular questions and responses by anon
  1. Chemsitry

    The Ksp of PbBr2 is 6.60× 10^–6. What is the molar solubility of PbBr2 in pure water? What is the molar solubility of PbBr2 in 0.500 M KBr solution? What is the molar solubility of PbBr2 in a 0.500 M Pb(NO3)2 solution?

    asked on March 17, 2013
  2. Calculus

    The acceleration function (in m/s2) and the initial velocity v(0) are given for a particle moving along a line. a(t) = 2t + 2, v(0) = −3, 0 ≤ t ≤ 5 (a) Find the velocity at time t. v(t) = ______ m/s (b) Find the distance traveled during the given

    asked on December 9, 2017
  3. Chemistry

    Classify each of the following as a redox reaction or a non-redox reaction. Zn+CuCl2 -> ZnCl2+Cu HCl+NaOH -> H2O+NaCl 2CO+O2 -> 2CO2 SO3+H2O -> H2SO4

    asked on December 2, 2012
  4. Chemistry

    In which of the following reactions is work done by the system to the surroundings? A) 2CH3OH(l) + 3O2(g) --> 4H2O(l) + 2CO2(g) B) S(s, rhombic) + O2(g) --> SO2(g) C) 2AgNO3(s) --> 2AgNO2(s) + O2(g) D)4Fe(s) + 3O2(g) --> 2Fe2O3(s) My guess is B because

    asked on March 23, 2017
  5. Chemistry

    Which one of the following compounds does not follow the octet rule? a) NF3 b) CF4 c) SF4 d) PH3 e) HCl I know I can eliminate A and B because nitrogen and carbon follow the octet rule. I know I can eliminate E because the total amount of valence electrons

    asked on April 27, 2017
  6. world history

    Which identify key colonial holdings that Allied power nations continued to control after World War I? Select all that apply. Britain in India Russia in Poland United States in Japan France in Vietnam I think its a and c but my text didnt explain it very

    asked on April 18, 2020
  7. Algebra 1 Please help

    A scientist is studying the growth of a particular species of plant. He writes the following equation to show the height of the plant f(n), in cm, after n days: f(n) = 8(1.05)n Part A: When the scientist concluded his study, the height of the plant was

    asked on December 17, 2016
  8. Math

    Susan wants to use blue, yellow, green, and pink paint to decorate her house. She needs 3 times as much blue paint as yellow paint and 1/2 as much yellow paint as green paint. She needs 3 1/4 gallons of pink paint, which is 3/4 of a gallon more than the

    asked on August 19, 2015
  9. world history

    What was the outcome of the attempts to try Ottoman war criminals after the Armenian Genocide? Military officials were convicted and executed, but politicians were acquitted. Although more than 100 were arrested, trials were not held because international

    asked on April 18, 2020
  10. Chemistry

    The boiling point of an aqueous solution is 102.48 °C. What is the freezing point? I know that formula for freezing point is delta Tf = Kf*m but what do I plug in for each?

    asked on January 29, 2013
  11. permutation and combination

    The game of euchre uses only the 9s, 10s, jacks, queens, kings, and aces from a standard deck of cards How many five-card hands have at least two red cards?

    asked on January 23, 2014
  12. Algebra 1

    1.) Which best describes a system of equations that has no solution? A. Consistent, independent B. inconsistent, dependent C. consistent, dependent D. inconsistent** 2.) How many solutions does this system have? 2x+y=3 6x=9-3y A. one B. none C. infinite**

    asked on December 20, 2018
  13. chemistry

    How many moles of HNO3 are present if 0.236mol of Ba(OH)2 was needed to neutralize the acid solution?

    asked on August 6, 2012
  14. Math

    a circle is divided into 9 equal parts. What is the angle measure of two of those parts

    asked on February 9, 2015
  15. chemistry

    A volume of 100mL of 1.00 M HCl solution is titrated with 1.00 M NaOH solution. You added the following quantities of 1.00 M NaOH to the reaction flask. Classify the following conditions based on whether they are before the equivalence point, at the

    asked on August 6, 2012
  16. Chemistry

    A solution is 5.0× 10–5 M in each of these ions: Ag , SO42–, Cl–, CO32– Which precipitate will form? Ag2SO4 (Ksp = 1.12× 10–5) AgCl (Ksp = 1.77× 10–10) Ag2CO3 (Ksp = 8.46× 10–12)

    asked on March 14, 2013
  17. world history

    Where did a massacre of thousands of Armenians occur during the Countercoup of 1909? a. Yerevan b. Istanbul c. Adana d. Gallipoli I know it's not b, i cant seem to figure it out

    asked on August 13, 2019
  18. Chemistry

    On another planet, the isotopes of titanium have the following natural abundances. Isotope 46Ti Abundance 70.900% Mass(amu) 45.95263 Isotope 48Ti Abundance 10.000% Mass(amu) 47.94795 Isotope 50Ti Abundance 19.100% Mass(amu) 49.94479 What is the average

    asked on December 8, 2012
  19. world history

    How did the “stab in the back” myth contribute to the Nazi rise to power? a. The propaganda campaign allowed Nazis to use Jews as scapegoats and create a common enemy. b. The children’s story was used by Nazis to glorify the socialist system that

    asked on August 16, 2019
  20. Algebra 1- Help please

    Belinda wants to invest $1000. The table below shows the value of her investment under two different options for three different years: Number of years 1 2 3 Option 1 (amount in dollars) 1100 1210 1331 Option 2 (amount in dollars) 1100 1200 1300 Part A:

    asked on December 17, 2016
  21. Chemistry

    Given H2(g) + (1/2)O2(g) --> H2O, ∆Hº = -286 kJ/mol, determine the standard enthalpy change for the reaction 2H2O(l) --> 2H2(g) + O2(g). Just checking... should end up with ∆Hº = 572 kJ/mol right??

    asked on March 25, 2017
  22. AP Chem

    A valid Lewis structure of __________ cannot be drawn without violating the octet rule. Answer: BeH2 Why would BeH2 break the octet?

    asked on January 13, 2013
  23. ET3034TUx Solar Energy

    Which of the following processes is used in order to fabricate mono-crystalline silicon? a) The Czochralski process b) Silicon ribbon process c) The float-zone process d) The silicon casting process

    asked on October 29, 2013
  24. Calculus

    The acceleration function (in m/s2) and the initial velocity v(0) are given for a particle moving along a line. a(t) = 2t + 2, v(0) = −3, 0 ≤ t ≤ 5 (a) Find the velocity at time t. v(t) = t^2+2t-3 m/s (b) Find the distance traveled during the given

    asked on December 9, 2017
  25. calculus

    A 5.5 foot tall woman walks at 6ft/s torward a street light that is 16.5 ft above the ground. what is the rate of change of the length of her shadow when she is 14ft from the street light? At what rate is the tip of her shadow moving? How do I get the

    asked on April 14, 2016
  26. math

    The point-slope form of the equation of the line that passes through (–5, –1) and (10, –7) is y plus 7 equals negative StartFraction 2 over 5 EndFraction left-parenthesis x minus 10 right-parenthesis.. What is the standard form of the equation for

    asked on October 14, 2019
  27. physics

    An object is moved from the outdoors, which is at a temperature of 100 ºF, to a room at a temperature of 70 º F. What happens to the object when it’s placed in the room with a lower temperature? a. The object gives off more energy than it absorbs until

    asked on October 5, 2019
  28. physics

    Read the scenario. A car increases its position at a constant velocity for 5 s. Then, it stops for 5 s. Which option provides a true statement about a distance-time graph created to represent this motion? The slope of the graph would be negative and

    asked on September 14, 2019
  29. Calculus AP

    f is a differentiable function on the interval [0, 1] and g(x) = f(2x). The table below gives values of f ′(x). What is the value of g ′(0.1)? x 0.1 0.2 0.3 0.4 0.5 f ′(x) 1 2 3 –4 5 The answers are: 1 2 4 cannot be determined I got 1 please let me

    asked on May 1, 2018
  30. Calculus

    Differentiate the following function from first principles f(x)= 5x/(3-x)

    asked on July 10, 2020
  31. us history

    What was the main effect of the Civil War on the women's movement? A. The women's movement shifted their focus to helping widows of the Civil War. B. The movement was put on hold while women focused on anti-slavery reform and the war effort. C. The

    asked on March 29, 2016
  32. HVAC/R

    Two technicians are discussing the HVAC/R field. Technician A says that industry codes that require certain types of installation practices carry the force of law with them. Technician B says that ANSI is an organization that establishes codes for the

    asked on July 17, 2014
  33. Chemistry

    Which of the following processes is endothermic? a) H2O (g) --> H2O (l) b) 3O2 (g) + 2CH3OH(g) --> 2CO2(g) + 2H2O(g) c) H2O (s) --> H2O (l) d) O2(g) + 2H2(g) --> 2H2O(g) I a guessing b, since energy has to go into the reaction for water to go from a solid

    asked on March 24, 2017
  34. Chemistry

    Calculate the standard free-energy change for the following reaction at 25 C degrees. 2Au^3+(aq)+3Ni(s) 2Au(s)+3Ni^2+(aq) Ni2+(aq) + 2e- -> Ni(s) E=-0.26 Au3+(aq) + 3e- -> Au(s) E=+1.498 G= ? KJ Would it be G=1.758? •Chemistry - DrBob222, Sunday, March

    asked on April 1, 2013
  35. algebra

    An equation, f, has a domain of all whole numbers and has a range of all real numbers. Does the equation represent a function? Explain why or why not.

    asked on July 16, 2020
  36. English

    Choose the word or phrase that best defines the italicized word. "An aged man is but a *paltry* thing,/ A tattered coat upon a stick..." a.inadequate b.invisible c.significant d.unwise

    asked on May 8, 2018
  37. Chemistry

    Which of the following reagents would oxidize Cr to Cr2 , but not Fe to Fe3 ? Ca Co Ca2+ Br2 Co2+ Br- Which of the following reagents would oxidize Cu to Cu2 , but not Cl– to Cl2? Br2 Ca Co2+ Co Br- Ca2+

    asked on March 29, 2013
  38. Chemistry

    (a) Calculate the molarity of a solution that contains 0.175 mol ZnCl2 in exactly 150 mL of solution. (b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid? (c) How many milliliters of 6.00 MNaOH solution are needed to

    asked on October 31, 2011
  39. spanish

    if you greet someone who is your age how do you ask how are you in spanish?

    asked on August 29, 2017
  40. Chemistry

    4.00 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant. A(s) B(g)+C(g) Then, the container volume was doubled

    asked on February 5, 2013
  41. math

    We have p,q,r,s,t and u asnonnegative real numbers. (a) Show that (p^2 + q^2)^2 (r^4 + s^4)(t^4 + u^4) ≥ (prt + qsu)^4. (b) Show that (p^2 + q^2)(r^2 + s^2)(t^2 + u^2) ≥ (prt + qsu)^2. i wanna put it in cauchy-schwarz form, but i can't figure out how

    asked on July 23, 2020
  42. English

    In “Cranes,” why does Song-sam volunteer to escort Tok-chae to Chongdan? A. Song-sam wants to find out why his old friend is on the communists’ side. B. Song-sam wants to talk with his old friend about their childhood. C. Song-sam needs closure on

    asked on April 23, 2020
  43. Math

    Find f. f ''(x) = 20x3 + 12x2 + 10, f(0) = 9, f(1) = 12

    asked on December 4, 2017
  44. Chemistry

    What is the oxidation state of Cr in K2Cr2O4?

    asked on August 19, 2016
  45. Chemistry

    Sort each of the following events based on whether the solubility of the indicated gas will increase, decrease, or stay the same. Each phrase specifies the gas involved and the change in its environment. 1. The temperature is increased 2.the partial

    asked on January 23, 2013
  46. math

    The graph represents a system of inequalities for the scenario where x is the number of confirmed parties on a tour and y is the number of required copies of the itinerary. Which constraint could be part of this system of equations? At least 2 copies are

    asked on November 21, 2019
  47. Chemistry

    The enthalpy of combustion of butane C4H10 is described by the reaction: C4H10(g) + (13/2) O2(g) -> 4CO2(g) + 5H2O(g) ΔH°rxn = –2613 kJ/mol Given the following enthalpies of formation: ΔH°f[CO2(g)] = -393.5 kJ/mol ΔH°f[H2O(g)] = -241.8 kJ/mol

    asked on March 18, 2017
  48. science

    What is the correct order of the steps used in the scientific method? (1) conduct background research (2) formulate a hypothesis (3) pose a question (4) test the hypothesis (5) analyze the data and draw a conclusion (6) communicate the results (1) pose a

    asked on December 16, 2019
  49. Algebra 1- Urgent

    The price of products may increase due to inflation and decrease due to depreciation. Derek is studying the change in the price of two products, A and B, over time. The price f(x), in dollars, of product A after x years is represented by the function

    asked on December 17, 2016
  50. Spanish

    Choose the sentence which correctly says "The king doesn't like to smoke." A. Al rey no le quiere fumar. B. Al rey no le gusta fumar. C. El rey no gusta fumar. D. El rey no quiere fumar.

    asked on March 17, 2011
  51. Chemistry

    Can someone check my answers? What is the oxidation state of each element in K2Cr2O7? K +1 Cr +6 O -2 What is the oxidation state of each element in SO32–? S +4 O -6

    asked on December 2, 2012
  52. Chemistry

    Sodium sulfate is slowly added to a solution containing 0.0500 M Ca^2+ (aq) and 0.0390 M Ag^+ (aq). What will be the concentration of Ca^2+ (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca^2+ (aq) can be separated from the Ag^+ (aq) by

    asked on March 17, 2013
  53. Chemistry

    Consider an amphoteric hydroxide, M(OH)2(s), where M is a generic metal. M(OH)2 (s) M^2+ (aq) + 2OH- (aq) Ksp=4e-16 M(OH)2 (s) + 2OH- (aq) M(OH)4 ^2- (aq) Kf=0.06 Estimate the solubility of M(OH)2 in a solution buffered at pH= 7.0, 10.0, and 14.0 I'm not

    asked on May 9, 2012
  54. world history

    What was the outcome of the 1914 Battle of Tannenberg on the eastern front? A. The battle resulted in a stalemate as both Russian and German armies suffered heavy losses. B. Russia was decisively victorious, capturing more than 50,000 German troops and

    asked on August 12, 2019
  55. Chemistry

    Given ∆Hºrxn = -1670 kJ/mol for 2Al(s) + (3/2)O2(g) --> Al2O3(s), determine ∆Hº for the reaction 2Al2O3(s) --> 4Al(s) + 3O2(g). I flipped Al(s) + (3/2)O2(g) --> Al2O3(s) to Al2O3(s) --> A(g) + (3/2)O2(s) and multiplied the molar values by 2. I ended

    asked on March 25, 2017
  56. Math

    Anita can clean a typical pool in 8 hours. Chao can clean a typical pool in 6 hours. How long should it take Anita and Chao working together to clean a typical pool? I'd like to know how to work out this problem in order to find the answer.

    asked on May 17, 2016
  57. precalulus

    a ship travels 60 miles due east, then adjusts its course northward. after travelling 80 miles in the new direction, the ship is 139 miles from its point of departure. calculate the ship's bearing.

    asked on March 1, 2016
  58. chemistry

    A bag of potato chips contains 575mL of air at 25.0∘C and a pressure of 765mmHg . Assuming the bag does not break, what will be its volume at the top of a mountain where the pressure is 458mmHg and the temperature is 10.0∘C?

    asked on October 31, 2014
  59. chemistry

    Calculate the pH of the resulting solution if 30.0 mL of 0.300 M HCl(aq) is added to (a) 35.0 mL of 0.300 M NaOH(aq). (b) 40.0 mL of 0.350 M NaOH(aq).

    asked on April 10, 2012
  60. physics

    A boy picks up a bowling ball. Which of the following choices correctly describes the interaction between the boy and the bowling ball? a.The boy exerts an upward force on the ball, and the bowling ball exerts a downward force on the boy. Both forces are

    asked on September 27, 2019
  61. Chemistry

    A possible set of quantum numbers for the last electron added to complete an atom of potassium in its ground state is a) n=4, l=0, ml=0, ms= -1/2 b) n=3, l=1, ml=0, ms= -1/2 c) n=4, l=1, ml=0, ms= +1/2 d) n=3, l=1, ml=1, ms= +1/2 e) n=4, l=2, ml=1, ms=

    asked on April 29, 2017
  62. ET3034TUx Solar Energy

    The width of the space charge region at a p-n junction is reduced by applying a voltage bias over the p-n junction. What is the correct statement on both the bias voltage and the p-n junction? a)The voltage is a forward bias and the diffusion of the

    asked on October 16, 2013
  63. Chemistry

    Which of the following compounds has the greatest molar solubility? A) AgBr, Ksp= 5.4 x 10^13 B) Ba3(PO4)2, Ksp = 3.0 x 10^-23 C) Al(OH)3, Ksp = 1.9 x 10^-33 D) MgF2, Ksp = 7.4 x 10^-11 E) Pb(OH)2, Ksp = 1.2 x 10^-15 I know the answer for this problem is

    asked on May 6, 2018
  64. chemistry

    Given these reactions : X(s) + 1/2O2(g) --> XO(s) (Delta)H= -707.7 kj XCO3(s) --> XO(s)+CO2(g) (Delta)H= +381.9kj What is (delta)Hrxm for this reaction? X(s)+1/2 O2(g)+CO2(g) ---> XCO3(s) (Delta)H= ?

    asked on October 28, 2016
  65. Spanish

    1.Choose the correct past participle for the Spanish verb cantar. A. canté B. cantaba C. cantado D. canto C is my answer. 2. Choose the correct past participle for the Spanish verb salir. A. salía B. salió C. salido D. sale C is also my answer. Choose

    asked on March 29, 2011
  66. geometry

    In right triangle ABC, ∠C is a right angle, m∠B=70∘, and AB=13. sin70∘≈0.94 cos70∘≈0.34 tan70∘≈2.75 What is the measurement of BC?

    asked on March 19, 2020
  67. english

    A problem shared in “Balancing Calories to Manage Weight” is that environmental factors promote overconsumption of calories and discourage calorie expenditure. How well does the article present a solution to the problem? a. The article provides a

    asked on October 2, 2019
  68. Chemistry

    To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 16.0 g, and its initial temperature is -11.4 °C. The water resulting from the melted ice reaches the temperature of your skin, 31.0 °C. How much

    asked on December 8, 2012
  69. english

    A question that is asked based on the information in Teach Every Child About Food is “Why do we need to teach our children about food?” How does Jamie Oliver effectively answer this question using persuasion? Teach Every Child About Food a. by stating

    asked on October 2, 2019
  70. Algebra 2

    A function is created to represent the amount of money in your checking account. What restrictions would be made to the domain? -The domain would include all real numbers.* -The domain would only include positive integers. -The domain would only include

    asked on January 12, 2016
  71. Classical Mechanics

    Mary wants to throw a can straight up into the air and then hit it with a second can. She wants the collision to occur at height h=5.0 m above the throw point. In addition, she knows that she needs t1=4.0 s between successive throws. Assuming that she

    asked on September 18, 2013
  72. Math

    which shape has 5 faces 5 vertices and 8 edges? triangular Pyramid** Rectangular pyramid Pentagonal pyramid

    asked on March 17, 2016
  73. Math

    Help, Divide 50 by half, and add 20. I do not understand.

    asked on April 2, 2015
  74. chemistry

    Write an equilibrium expression for each chemical equation involving one or more solid or liquid reactants or products. HCHO2(aq)+H2O(l)⇌H3O+(aq)+CHO−2(aq) Use A for [HCHO2], B for [H2O], C for [H3O+], D for [CHO−2].

    asked on December 3, 2014
  75. Grammar-clauses

    I put the underlined parts of the sentences in parentheses. William Faulkner’s The Sound and the Fury is a novel (that uses the technique of stream of consciousness). independent clause adverbial clause adjectival clause (my answer) noun clause It takes

    asked on December 11, 2012
  76. Earth Science

    Which of the following statements about ozone are true? Select the two correct answers. a. Most ground level ozone is released by vehicles. b. Ozone is helpful for reducing smog levels.*** c. Ozone at ground level is harmful to human health. d. Ozone in

    asked on November 9, 2019
  77. Chemistry

    A 32 W (1 W = 1 J/s) lamp generates violet light at a wavelength of 420 nm. How many photons of this light will the lamp generate in 2.0 s?

    asked on April 9, 2017
  78. Calculus

    Consider the following planes. 5x − 4y + z = 1, 4x + y − 5z = 5 a) Find parametric equations for the line of intersection of the planes. b) Find the angle between the planes

    asked on September 5, 2016
  79. English

    I have a few questions. It was a long assignment and most of the questions were easy but a few I'm nervous about. Short story "The Olympic Swimmer" Who will be the winner bold? Athletes from both far and near Train and strain to be the best. But who will

    asked on December 7, 2015
  80. Chemistry

    What concentration of SO32– is in equilibrium with Ag2SO3(s) and 3.20 × 10-3 M Ag ? The Ksp of Ag2SO3=1.50×10^–14 Is the concentration of SO32- = 4.69*10^-12?

    asked on March 17, 2013
  81. Mathematics

    A is partly constant and partly varies with B. When B =5, A=19 and when B=10, A=34. Find A when B is 7

    asked on June 29, 2020
  82. Chemistry

    Which of the reactions are spontaneous (favorable)? a. 2H2O(g)⟶2H2(g)+O2(g) Δ𝐺=457 kJ/mol b. CH4(g)+2O2(g)⟶CO2(g)+2H2O(l) Δ𝐺=−820 kJ/mol c. 2Mg(s)+O2(g)⟶2MgO(s) Δ𝐺=−1137 kJ/mol d. C(s)+H2O(l)⟶CO(g)+H2(g) Δ𝐺=90.8 kJ/mol e.

    asked on April 29, 2020
  83. Chemistry

    Which statement is always true if ΔU sys is always negative? a) q = w b) +q>–w c) -w> +q d) +w>-q

    asked on March 11, 2017
  84. Physics

    Three dynamics carts have force sensors placed on top of them.(cart 1, with mass of 2.2 kg, has one sensor --> cart 2, with mass of 2.5 kg, has sensors two and then three --> cart 3, with mass of 1.8 kg, has sensors four then five). Each force sensor is

    asked on May 7, 2016
  85. us history

    The idea of "conversion" is best explained as which of the following? A. the process of cultural change brought about by immigration B. the process of changing the frontier into settled communities C. the process of spreading United States territory across

    asked on March 29, 2016
  86. history

    The last part of the Declaration of Independence contains a list of complaints the colonists had against King George. Which of the following best describes an economic complaint the colonists had toward the king? A)He cut off trade. B)He took away colonial

    asked on December 11, 2015

    The region R is bounded by the x-axis, y-axis, x = 3 and y = 1/(sqrt(x+1)) A. Find the area of region R. B. Find the volume of the solid formed when the region R is revolved about the x-axis. C. The solid formed in part B is divided into two solids of

    asked on April 29, 2014
  88. Science (Chemistry)

    A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached

    asked on February 2, 2014
  89. Science

    Female silkworm moths (Bombyx mori) attract males by emitting chemical signals that spread through the air. A male hundreds of meters away can detect these molecules and fly toward their source. The sensory organs responsible for this behavior are the

    asked on July 3, 2013
  90. Spanish

    Give the correct form of the appropriate verb, saber or conocer, which would be used in writing the following sentences in Spanish. 12. C Maria knew everyone. 13. S Because he had already seen the movie, he knew what happened? 14. S The student knows the

    asked on March 23, 2011
  91. Calculus 12th grade (double check my work please)

    1.)Find dy/dx when y= Ln (sinh 2x) my answer >> 2coth 2x. 2.)Find dy/dx when sinh 3y=cos 2x A.-2 sin 2x B.-2 sin 2x / sinh 3y C.-2/3tan (2x/3y) D.-2sin2x / 3 cosh 3yz...>> my answer. 2).Find the derivative of y=cos(x^2) with respect to x. A.-sin (2x) B.-2x

    asked on March 6, 2011
  92. science

    Which choice correctly describes the waves in the electromagnetic spectrum? The bands within the spectrum are made of fluctuating electric and magnetic fields and have the same frequency and wavelength. The bands within the spectrum are made of fluctuating

    asked on April 24, 2020
  93. chemistry

    If you have 500 ml of .15M Formic Acid, what is the pH of this solution? What is the pKa? How many grams of Sodium Formate would you have to add to raise the pH to 3.85? How many grams of HCl would you have to add to lower the new pH by .2 ?

    asked on August 2, 2018
  94. Chemistry

    A metal foil has a threshold frequency of 5.45 x 10^14 Hz. Which color of visible light will not eject electrons from this metal? a) blue b) indigo c) violet d) orange c=(wavelength)(v) 3.0x10^8m/s = (wavelength)(5.45 x 10^14 Hz) 550 nm -> releases green.

    asked on April 9, 2017
  95. Math

    A rectangle is dilated using a scale factor of 6. The image is then dilated using a scale factor of 1/3. What scale factor could you use to dilate the original rectangle to get to the final rectangle. Explain.

    asked on November 17, 2016
  96. math

    Weights of women are normally distributed with mean 143 pounds and standard deviation 29 pounds. If 36 women are randomly selected, what is the probability that their mean weight is between 120 and 160 pounds? Round your answer to two decimal places.

    asked on March 31, 2016
  97. Algebra

    A projectile which is fired from the ground with a velocity of 960 ft/sec, at an angle of 30° above the ground, has a height at time t of h(t)=480t–16t2. Find the time when it hits the ground again.

    asked on February 21, 2016
  98. small business management

    An Internet search for information about franchise businesses will not help you find out A. the number of hours you'll have to put in. B. start-up costs. C. the variety of franchise businesses available. D. support you'll receive from the parent

    asked on July 8, 2015
  99. Physics

    A stone is tied to a string (length = 0.700 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the

    asked on September 25, 2014
  100. Geometry

    In baseball, the length of the path between each pair of consecutive bases is 90 feet. The paths form right angles. How far does the ball need to travel if it is thrown from home plate directly to second base? A. 90 feet B. 127.3 feet C. 135.7 feet D. 180

    asked on March 6, 2014


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