Popular questions and responses by alexis
  1. Chemistry

    Calculate ΔG° for the following reaction at 298 K.? A+B --> 2D ΔH° = 775.0 kJ ΔS°=296.0 J/K C --> D ΔH° = 446.0 kJ ΔS°=-218.0 J/K A+B --> 2C ΔG° = ? kJ I know I am suppose to reverse the (C --> D) and add a coefficient of 2 to both the enthalpy

    asked on April 20, 2014
  2. Chemistry

    In the reaction 2H2S + 3O2 -> 2SO2 +2H2O, the oxidizing agent is 1.oxygen 2.water 3.sulfur dioxide 4.hydrogen sulfide oxygen?

    asked on March 20, 2011
  3. 7th grade math

    Not sure how to solve this: Suppose your school is selling magazine subscriptions. Each subscription cost $20. the company pays the school half of the total sales in dollars. The school must also pay a one-time fee of $18. What is the fewest number of

    asked on October 17, 2014
  4. chemistry

    You add 8.7g of iron to 21.30mL of water and observe that the volume of iron and water together is 22.41mL . Calculate the density of iron.

    asked on February 22, 2015
  5. math

    An urn contains 10 red balls, 6 green balls, 15 orange balls, and 14 blue balls. If one ball is randomly drawn from the urn, what are the odds against the ball being red? State your answer as a ratio using a colon to separate the two numbers.

    asked on November 2, 2017
  6. algebra 1

    1. Which of the following is equivalent to x^5y^2/xy^2 when x not= 0 and y not= 0? a. x^6y^5 b. x^5y c. x^4y d. x^4

    asked on January 18, 2018
  7. Chemistry

    Using a table of standard reduction potentials, determine the best answer to the following questions. a) Which of the following reagents would oxidize Cr to Cr3 , but not Ag to Ag ? Choices: Ca^2+, Br2, Co^2+, Ca, Br^-, or Co. b) Which of the following

    asked on May 4, 2014
  8. fgcu

    More than a decade ago, high levels of lead in the blood put 88% of children at risk. A concerted effort was made to remove lead from the environment. Now, suppose only 12% of children in the United States are at risk of high blood-lead levels. (a) In a

    asked on March 27, 2013
  9. 7th grade math

    Aaron is staying at a hotel that charges $99.95 per night plus tax for a room. A tax of 8% is applied to the room rate, and an additional one-time untaxed fee of $5.00 is charged by the hotel. Which of the following represents Aaron’s total charge, in

    asked on September 8, 2017
  10. Chemistry

    which equation represents an oxidation-reduction reaction? 1.HCl+KOH-->KCl+H2O 2.4HCl+MnO2-->MnCl2+2H2O+Cl2 3.2HCl+CaCO3-->CaCl2+H2O+CO2 4.2HCl+FeS-->FeCl2+H2S

    asked on March 20, 2011
  11. Chemistry

    Hydrogen peroxide can act as either an oxidizing agent or a reducing agent, depending on the species present in solution. Write balanced half-reaction equations for each of the following: (a) H2O2(aq) acting as an oxidizing agent in an acidic solution.

    asked on April 28, 2014
  12. Chemistry

    Predict how the entropy of the substance is affected in the following processes: a) O2 (g,200 kPa, 300k) --> O2 (g, 100, 300k) b)Br2 (l, 1 bar, 25 degree C) --> Br2 (g, 1 bar, 25 degree C) C)Fe (s, 1 bar, 250 degree C)--> Fe(s, 1 bar, 25 degree C) will

    asked on April 20, 2014
  13. Math

    A muffin recipe calls for a ratio of 5 cups of flour to 2 cups of sugar. For each cup of sugar that is used, how many cups of flour are needed?

    asked on March 29, 2017
  14. Chemistry

    If delta H°rxn and delta S°rxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is a)enthalpy driven to the left. b)entropy driven to the right. c)entropy driven to the

    asked on April 20, 2014
  15. Chemistry

    use the data from this table of thermodynamic properties to calculate the maximum amount of work that can be obtained from the combustion of 1.00 moles of ethane, CH3CH3(g), at 25 °C and standard conditions. on the chart is said ethane(C2H6) is -84.0. In

    asked on April 28, 2014
  16. Math (trig)

    The distance from home plate to dead center field in a certain baseball stadium is 409 feet. A baseball diamond is square with a distance from home plate to first plate base 90 feet. How far is it from first base to dead center field? I also need help

    asked on November 23, 2014
  17. Chemistry

    Draw the resonance structures for SeS2 and SiS2. There are 2 for SeS2 and 3 for SiS2. I really need help with this. If it can be explain with words, since pictures would be hard. Thanks!

    asked on December 1, 2010
  18. physics

    Anna applies a force of 19.5 newtons to push a book placed on a table. If the normal force of the book is 51.7 newtons, what is the coefficient of kinetic friction? A) .01 B) .20 C) .38 D) .48

    asked on April 7, 2015
  19. physics

    an arrow is shot at a 30 degree angle with the horizontal. it has a velocity of 49 m/s how high will the arrow go? what horizontal distance will the arrow travel? and how long will the arrow be in the air?

    asked on December 17, 2017
  20. Chemistry

    A 0.170-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co2 ions at equilibrium? Assume the formation constant (Kf) of Co(NH3)62 is 5.0× 1031 M–6. I don't really know how to start. At first I thought about

    asked on April 14, 2014
  21. physics

    A 75.0 kg stunt man jumps from a balcony and falls 28.0 m before colliding with a pile of mattresses. If the mattresses are compressed 0.800 m before he is brought to rest, what is the average force exerted by the mattresses on the stuntman?

    asked on November 11, 2012
  22. Science

    The coinage metals - copper, silver, and gold - are considered to be a chemical family. List three arguments to explain why. Please help!!

    asked on June 1, 2017
  23. Algebra

    A survey was taken of students in math classes to find out how many hours per day students spend on social media. The survey results for the first-, second-, and third-period classes are as follows: First period: 2, 4, 3, 1, 0, 2, 1, 3, 1, 4, 9, 2, 4, 3, 0

    asked on April 18, 2017
  24. Chemistry

    An unsealed 750 mL beaker contains 500 mL of very dense gas at 25.0 degrees C and 1.10 atm. The gas is much denser than the surrounding air, so it does not disperse into the air. (a) At constant pressure, what would the temperature have to reach for the

    asked on March 6, 2017
  25. 7th grade LA

    Can you check the following? 1. I didn't know what time it was so I was very late to class indep = I didn't know what time it was indep = I was very late to class Ans: compound 2. I'll help you if you help me. indep = I'll help you dep = if you help me

    asked on October 15, 2014
  26. AP Physics B

    A 63.6-kg bungee jumper is standing on a tall platform (h0 = 50.6 m). The bungee cord has an unstrained length of L0 = 9.54 m and, when stretched, behaves like an ideal spring with a spring constant of k = 67.8 N/m. The jumper falls from rest, and it is

    asked on November 29, 2012
  27. Science

    Hurricane Katrina, which hit the Gulf Coast of Louisiana and Mississippi on August 29, 2005, had the second lowest ever recorded barometric pressure at 920mb. Convert this pressure to units of atmospheres, and inches of Hg. 1 bar = 0.98692 atm 0.92 bar =

    asked on September 2, 2015
  28. basic english

    The gist of the saying went something like this: If a person wants to get ahead in life, you have to be willing to work for it. Which of the following language conventions is violated in the sentence above? Use of a colon Verb tense Pronoun-antecedent

    asked on May 26, 2015
  29. Geometry

    ABCD is a parallelogram. If AB = 2x - y, CD = 7, BC = x + y , AD = 2 find x and y.

    asked on September 4, 2011
  30. Calculus 2

    A culture of bacteria is growing at the rate of 20e^0.8t cells per day, where t is the number of days since the culture was started. Suppose that the culture began with 50 cells. (a) Find a formula for the total number of cells in the culture after t days.

    asked on September 18, 2016
  31. Hisyory

    How are Aristotle's teachings related to the scientific method used by scientists today?

    asked on May 21, 2016
  32. Science

    Which are reasons to get a claim peer reviewed? Check all that apply. A peer review verifies conclusions. A peer review proves everyone else wrong. A peer review maintains standards of the field. A peer review identifies sources of errors. A peer review

    asked on September 13, 2015
  33. Science

    A hydraulic lift office chair has its seat attached to a piston with an area of 11.2 cm2 . The chair is raised by exerting force on another piston, with an area of 4.12 cm2 . If a person sitting on the chair exerts a downward force of 219 N, what force

    asked on September 29, 2012
  34. Math help plz?

    6. Which inequality matches the graph? The graph is -3 -2 -1 0 1 2 3 4 and there is a red line from 1 to -3 The answer is 3x + 1 _< 4 but idk why? 19. Which inequality matches the graph? -3 -2 -1 0 1 2 3 4 and it has a red line from 2 to 4 the answer is 8p

    asked on December 18, 2015
  35. Chemistry

    Which of the following processes are spontaneous? (Select all that apply.) a. average car prices increasing b. a soft-boiled egg becoming raw c. a satellite falling to Earth d. water decomposing to H2 and O2 at 298 K and 1 atm I thought it would c and

    asked on April 18, 2015
  36. 7th grade math

    Can you check these? 1. Olivia typed 2 pages in 15 minutes. Write an equation relating the number of minutes m to the number of pages typed. How long will it take her to type 10 pages at this rate? Ans: 15/2 = 7.5 = 7.5 * 10 = 75 minutes 2. If the ratio of

    asked on December 6, 2014
  37. Investing ( pease help)

    Maxwell Feed & Seed is considering a project that has the following cash flow data. What is the project's IRR? Note that a project's projected IRR can be less than the WACC (and even negative), in which case it will be rejected. WACC 10.00% Year 0 1 2 3 4

    asked on July 28, 2009
  38. math, I need help please answer quickly!

    A) Estimate 49% of 162 B) Use mental math to calculate 49% of 62

    asked on January 13, 2018
  39. physics

    A 4.00 kg ball traveling North with a momentum of 11.2 kg.m/s collides with a 6.0 kg ball traveling West with a momentum of 18 kg.m/s. The two balls stick together and head off as one. What is the momentum of the combined masses? What is the velocity of

    asked on April 19, 2015
  40. math

    Find the fifth term of a geometric sequence whose fourth term is 8/9 and whose seventh term is 64/243.

    asked on March 16, 2015
  41. physics

    A person walks 4.0 miles east and then makes a 50° turn to the right and walks another 2.0 miles. How far is she from her starting point?

    asked on February 17, 2015
  42. Math Personal Finance

    Assume a 30-month CD purchased for $4000 pays simple interest at an annual rate of 5.5%. How much total interest does it earn? What is the balance at maturity?

    asked on June 8, 2014
  43. physical science

    A 65 kilogram person stands on a diving board 15 meters above the water. figure the GPE. show formula and work

    asked on September 18, 2011
  44. Chemistry

    Zn(s)+Cu2+(aq)-->Zn2+(aq)+Cu(s) which particles must be transferred from one reactant to the other reactant ? 1.ions 2.neutrons 3.protons 4.electrons 4?

    asked on March 20, 2011
  45. calc

    Suppose a curve is traced by the parametric equations x=1sin(t) y=18-3cos^2(t)-4sin(t) At what point (x,y) on this curve is the tangent line horizontal?

    asked on October 30, 2008
  46. accounting

    The accounting records of NuTronics, Inc., include the following information for the year ended December 31, 2011. Dec. 31 Jan. 1 Inventory of materials $ 24,000 $ 20,000 Inventory of work in process 8,000 12,000 Inventory of finished goods 90,000 80,000

    asked on January 22, 2013
  47. Math

    The cost X, in dollars, to produce graphing calculators is given by the function C(x) = 51x + 2000, where x is the number of calculators produced. How many calculators can be produced for $104,000?

    asked on November 16, 2019
  48. Science

    What is the independent or manipulated variable in this experiment

    asked on August 28, 2019

    The sum of nine and a number, x, is three

    asked on September 27, 2017
  50. 8th grade math - 2way tables

    Can you help with this: An 8th grade class wen to to Disney World. Out of the 181 students who went to the park, 68 visited Epcot. There were a total of 127 students who visited magic kingdom and 50 of those also visited epcot. construct a two-way table to

    asked on March 7, 2016
  51. history

    Describe the primary economic activity for each of the three colonial regions: the New England colonies, the Middle colonies, and the Southern colonies. Explain how the geography of each region helped determine its economy. I don't know how to explain it

    asked on October 13, 2015
  52. Consumer math

    A deposit of 4,000 at 9.5% for 270 days

    asked on April 30, 2015
  53. Math

    Sustem of equations. I have to solve the system of equations by graphing and solving. Ther are thirty-three students in the Chess Club. There are five more boys than girls in the club. Write and solve a system of equations to find the number of boys and

    asked on January 29, 2013
  54. geometry

    Triangle ABC is congruent to triangle DEF. If the length of AB is 12 feet and the length of AC is 10 feet. Find the length of DE. can someone please help me on this question please and thank youu :)

    asked on September 3, 2011
  55. Math

    Use the sum or difference identities to find the exact value of each trigonometric function. sec pi/12 Thanks :)

    asked on February 17, 2011
  56. algebra

    $7.80/hour = ______ cents/minute?

    asked on November 28, 2010
  57. Chemistry

    A gas has a density of 1.25 g/L at STP. What is its molecular mass?

    asked on September 2, 2010
  58. math

    The region between the graphs of y=x^2 and y=2x is rotated around the line x=2. how do you find the volume of the object?

    asked on September 29, 2008
  59. Math

    A photographer wants to print a photograph and two smaller copies on a rectangular sheet of paper. The larger photographer and the smaller photographs are in proportion. The larger photograph has a width of 4 inches and a length of 6 inches. Find the

    asked on January 21, 2019
  60. 9th grade algebra (completing square)

    Can you check the following? A1. (2x + 3)^2 = 25 sqrt(2x + 3)^2 = +-sqrt(25) 2x + 3 = +- 5 2x + 3 = 5, 2x + 3 = -5 2x = 2, 2x = -8 x = 1, x = -4 {-4, 1} A2. x^2 + 14x + 45 = 0 x^2 + 14x + __ = -45 + __ x^2 + 14x + 49 = -45 + 49 (x +7)^2 = 4 sqrt(x+7)^2 =

    asked on November 9, 2016
  61. 9th grade algebra (factoring with quadratic)

    Can you check the following problems? 4. x^2 - 10x +25 = 9 x^2 - 10x + (25 -9) = 9 - 9 x^2 - 10x + 16 = 0 (x - 8)(x-2) = 0 x - 8 = 0, x - 2 = 0 x = 8, x = 2 5. x^2 - 6x + 9 = 49 x^2 - 6x + ( 9 - 49) = 49 - 49 x^2 - 6x - 40 = 0 (x -10)(x + 4) = 0 x - 10 =

    asked on November 1, 2016
  62. math

    Greg and Sam ordered a pizza for lunch. Greg ate 34 of the pizza, and Sam ate 18 of the pizza. How much of the whole pizza

    asked on May 10, 2016
  63. Chemistry

    The heat of neutralization of HCl(aq) and NaOH(aq) is -55.90 kJ/mol of water produced. If 50.00 mL of 1.16 M NaOH at 25.15 ºC is added to 25.00 mL of 1.79 M HCl at 26.34 ºC in a plastic-foam cup calorimeter, what willthe solution temperature be

    asked on November 1, 2015
  64. Math - 7th grade

    Can you check/explain the following: 1. If you roll a number cube 66 times, how many times should you expect to roll a 1? a. 9 times b. 11 times c. 8 times d. 10 times Ans. P(1) = favorable outcome/possible outcome = 66/396 , (1 x 66rolls, and 6sides x 66

    asked on May 5, 2015
  65. Analytic Geometry

    The ordinate of a point P is twice the abscissa. This point is equidistant from (-3, 1) and (8,-2). Find the coordinates of P.

    asked on April 22, 2015
  66. 7th grade math

    1. Evan withdrew a total of $160 from an ATM machine over a 4-day period. He withdrew the same amount of money each day. a. Write an expression to represent the total amount that Evan's account changed each day. Ans: 4d b. What integer represents the total

    asked on March 24, 2015
  67. 7th grade math

    Can you check my homework? (wasn't really sure about #4 and #6) 1. Tekell ate 10 pieces of candy in the same time that Mackensay ate 4 pieces. How many pieces will Tekell have eaten when Mackensay eats 6? Ans: 10/x = 4/6 4x = 60 x = 15 pieces of candy 2.

    asked on December 6, 2014
  68. Math

    How can you check the answer to a decimal multiplication problem?

    asked on October 12, 2014
  69. 7th grade math

    Can you check this problem? Jean has 5 different colors of markers: red, blue, green, orange, and purple. Two colors are used to make a sign. How many different combinations are possible? List them. Ans: 10 possible combinations red/blue, red/green,

    asked on September 30, 2014
  70. Pre-Calculus

    Express the complex number in polar form. 5-12i

    asked on March 15, 2014
  71. physics URGENT! HELP

    If an object is thrown in an upward direction from the top of a building 1.60 x 102 ft. high at an initial velocity of 21.82 mi/h, what is its final velocity when it hits the ground? (Disregard wind resistance. Round answer to nearest whole number and do

    asked on November 7, 2012
  72. Chemistry

    human blood contains dissolved carbonc acid in equilibrium with carbon dioxide and water according to the reaction: h2CO3(aq)CO2(aq)+H2O(l) explain why decreasing the concentration of Co2 will ultimately decrease the concentration of H2CO3.

    asked on March 17, 2011
  73. physics

    An alpha particle, the nucleus of a helium atom, is at rest at the origin of a Cartesian coordinate system. A proton is moving with a velocity of v towards the alpha particle from the positive x axis direction. If the proton is initially far enough away to

    asked on September 29, 2008
  74. chemistry

    The isomerization reaction H3CNC(g) H3CCN(g) was found to be first order in H3CNC. At 600 K, the concentration of H3CNC is 75% of its original value after 205 s. (a) What is the rate constant for this isomerization reaction at 600 K? (b) At what time will

    asked on August 6, 2008
  75. math

    Tim has 20 quarters from the car wash how many cents does Tim have?

    asked on April 28, 2020
  76. algebra

    A tennis team has 24 members. There are twice as many girls as boys on the team. How many girls are on the tennis team?

    asked on February 4, 2020
  77. geography

    Which of the following correctly pairs a branch of the U.S. government and its power? A. legislative: interprets laws B. executive: makes laws C. executive: enforces laws D. judicial: enforces laws my answer is b, but can someone check it to make sure?

    asked on October 8, 2019
  78. Spanish 1

    Si a Juan le gusta estudiar, ¿cómo es? A. paciente B. ordenado C. estudioso D. atrevido

    asked on August 19, 2019
  79. Math

    Kevin brought 2 pens and 2 erasers for $1.50. Lynn brought 1 pen and 1 notebook for $1.50. Maria brought 2 notebooks for $2.20. How much did Neal pay for 4 erasers?

    asked on June 14, 2017
  80. 9th grade alegbra - geometric sequence

    Can you explain how to find explicit and recursive formula of geometric sequence given 2 terms? 23. a = -12, a = -6 ratio: -6/-12 = 1/2 explicit: a = ar^(n-1) -6 = a(1/2)^4 -6 = a(0.37) -0.010 = a??? a = -0.010(1/2)^n-1 recursive: a = ar a = -0.010(1/2)

    asked on January 19, 2017
  81. Math

    Hannah and Her Three Brothers equally split the cost of a $379 gift for their parents how much did each sibling pay?

    asked on January 11, 2017
  82. Grade 11 Physics

    Megan and Catrina are at a playground swing set. Catrina pulls Megan back so that the 2.5 m long chain makes a 35 angle with the vertical. She pushes her with a speed of 6.5 m/s and Megan begins to swing forward. a) What is Megan’s fastest speed? b)

    asked on November 16, 2016
  83. math

    What equation is equivalent to 24=ax+4y-10, when solving for y? A: y=7/2-ax/4 B: y=17/2-ax/4 C: y=17- ax/4 D: y=34- ax

    asked on September 18, 2016
  84. Algebra1

    Can you check my answers? 1. Table modeling a linear relationship is shown below. What is the rate of change of nails to birdhouses? 2 birdhouses to 22 nails 3 birdhouses to 33 nails 4 birdhouses to 44 nails 5 birdhouses to 55 nails a. 55 nails per

    asked on September 6, 2016
  85. Math

    Find the coordinates of the point which is 3/5 of the way from (3, 2) to (-3, 5).

    asked on July 7, 2016
  86. reading

    According to the article, the reader can tell that __________.Joshua Haggmark probably believes that the best way to deal with droughts is to have people conserve water.Susan Jordan probably thinks that officials are more worried than they need to be about

    asked on May 16, 2016
  87. Statistics Homework

    Political Contributions: Listed below are contributions (in dollars) made to the two presidential candidates in a recent election. All contributions are from the same zip code as the author, and the data are from the Huffington Post. Do the contributions

    asked on May 10, 2016
  88. SS

    1) Fundamental Constitution of Carolina (what was this and what did it include?) 2) Mayflower Compact (what was this & what type of government did it establish & why was it written?) 3) Slave codes (and why South Carolina had them) Can someone plz help me

    asked on December 17, 2015
  89. Trigonometry

    A cat, sitting on top of a tree, spots a dog and a firefighter, both on flat ground below. From the cat's point of view, the dog is 10m south, at an angle of depression of 65 degrees, and the firefighter is some distance east of the tree, at an angle of

    asked on December 13, 2015
  90. 8th grade algebra

    Can you check my answers? 1. 3√20/√4 = 3√(5)(4)/2 = 3(2)√5/2 = 3√5 2. 4√15/√9 = 4√15/3 3. √12/√16 = √4(3)/4 = 2√3/4 = √3/2 4. √10/√5 = √2 5. √15/√20 = √(5)(3)/√5(4) = √3/2 6. 4√10/√32 = 4√2(5)/√16(2) =

    asked on December 10, 2015
  91. Math

    Naomi and 50 red beads and white beats the number of red beads is one more than six times the number of white bees how many red beans does Naomi have. What does one more than six times the number of white beads mean coming from me Alexis I do not know how

    asked on October 19, 2015
  92. Possessive pronoun english

    Which of the following sentences contains a possessive pronoun? The beautiful red sweater was hers. She and I went to the beach. She’s the one to do the job correctly. It is only right that the trophy belongs to her. is this one A?

    asked on May 26, 2015
  93. Analytic Geometry

    Water spouts from a horizontal pipe 12 meters above the ground. Three meters below the line of the pipe, the water trajectory is at a horizontal distance of 5 meters from the water outlet. How far from the water outlet will the stream of the water hit the

    asked on May 11, 2015
  94. Language Arts

    Why did Miss Suzuki visit Mieko's house

    asked on May 8, 2015
  95. 7th grade math (probability)

    I'm re-posting corrections originally from Wednesday in addition to new ones. Still not sure how to answer #4. 2. Edwin rolls a number cube and then spins a color from a color card (red, yellow, blue, green, white). What is the probability that he will

    asked on May 8, 2015
  96. 7th grade math

    Can you check the folowing problems. 1. 8(10) + 8(4) = 8(14) is an example of which property? A. Distributive property B. Associative property C. Identiy property D. Commutative property Ans:A 2. By Saturday night, 3 inches of rain had fallen in Happy

    asked on April 22, 2015
  97. Analytic Geometry

    Show that the points A(-2, 6), B(5, 3), C(-1, -11) and D(-8, -8) are the vertices of a rectangle.

    asked on April 22, 2015
  98. 7th grade math (probability)

    Can you check these, please? Ten cards numbered 1 through 10 are mixed together and then one card is drawn. Find the probability of each event. Write each answer as a fraction, percent, and decimal. 14. P(less than 5) = 4/10 = 2/5 Ans: 2/5, 40%, 0.4 15.

    asked on March 26, 2015
  99. math

    Alice is 5 feet and has shadow of 4 feet long. how tall is the tree?

    asked on March 24, 2015
  100. Science - 7th grade (repost)

    Can you check my homework? 38. How does natural selection lead to evolution? a. Organisms mutate to adapt to their environment. b. Helpful traits accumulate among surviving members of the species. c. Overproduction provides food for stronger members of the

    asked on March 12, 2015


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