# Alexis

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

2. ## 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.

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

4. ## 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

5. ## 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

6. ## 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.

7. ## Chemistry

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

8. ## 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

9. ## 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

10. ## 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

11. ## 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

12. ## 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?

13. ## 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

14. ## 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

15. ## 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?

16. ## 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.

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

18. ## 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

19. ## math

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

20. ## 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

21. ## 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

22. ## Chemistry

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

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

24. ## Science

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

25. ## 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

26. ## 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?

27. ## 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

28. ## 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

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

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.

31. ## Hisyory

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

32. ## 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

33. ## 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

34. ## 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

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

36. ## Pre-Calculus

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

37. ## Geometry

ABCD is a parallelogram. Find x and y using the following information: AB = 5x - 2y DC = 4 AD = y BC = 5 - x

38. ## 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 :)

How do I answer this......Write three ways to find 3x2x4.

40. ## algebra

\$7.80/hour = ______ cents/minute?

41. ## algebra

Find two numbers a and b whose sum a + b is 2 and whose difference a − b is -4?

42. ## Science

What is the independent or manipulated variable in this experiment

43. ## 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

44. ## 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 =

45. ## 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

46. ## Language Arts

Why did Miss Suzuki visit Mieko's house

47. ## Consumer math

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

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,

49. ## Pre-Calculus

Write the polar equation in rectangular form... r=5sintheta

50. ## chemistry

A student mixed 75.0 mL of water containing 0.75 mol HCl at 25�C with 75.0 mL of water containing 0.75 mol of NaOH at 25�C in a foam cup calorimeter. The temperature of the resulting solution increased to 35�C. How much heat in kilojoules was

51. ## Algebra

What is the 20th term in the following arithmetic sequence? 1/2, 1, 3/2, 2

52. ## Math

What is the equation for the parabola with vertex (0, 0) and focus (5, 0)

53. ## 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?

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)

55. ## 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

56. ## 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

57. ## sentence fluency english

Which of the following options best demonstrates sentence fluency? The two boys went to the store to buy some milk with their mother and her boyfriend, who had a broken foot after supper. The two boys went to the store to buy some milk after supper with

58. ## 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

59. ## chemistry

the vapor pressure of carbon sulfide is 355.6 torr at 25 degrees Celsius. what is the vapor pressure of a solution prepared by dissolving 12.52 g naphthalene (C10H8, 128.2 g/mol) in 125.0 mL CS2 liquid (76.14 g/mol, 1.261 g/mL)? Assume the solution obeys

60. ## 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?

Can you check the following? 10. A store pays \$10 for a bracelet, and the markup is 115%. A customer will also pay 5 1/2% sales tax. What will be the total cost of the bracelet to nearest cent? t = 1.15 x 10 t = \$11.5 (markup price) t = \$10 + 11.5 t =

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.

63. ## Math Personal Finance

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

64. ## 6th grade Lang Arts

Can you check my homework, please? Identify each pronoun as personal, reflexive, demonstrative, indefinite or interogative. 1. These are Elberta peaches, which are very popular in the United States. Ans: these = indefinite 2. Nobody really knows where the

65. ## Pre Calculus

Find each product or quotient. Express the result in rectangular form. 2(cosπ/6+isinπ/6) X 4(cos2π/3 +i2π/3)

66. ## MATH

A STUDENT COUNCIL COMMITTEE IS MADE UP OF 4 BOYS AND 5 GIRLS.IF 2 COMMITTEE MEMBERS ARE CHOSEN AT RANDOM TO ATTEND A CONFERENCE,WHAT IS THE PROBABILITY THAT BOTH MEMBERS WILL BE BOYS?

67. ## MATH

ESTIMATION. WHICH IS THE BEST ESTIMATE FOR THE AREA OF A SQUARE WITH SIDES EQUAL TO 4 1/8 INCHES?

68. ## 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

69. ## 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

70. ## Math-Ellipses

What is the equation of the ellipse with co-vertices (0, 2), (0, -2) and vertices (3, 0), (-3, 0)

71. ## physical science

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

72. ## Geometry

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

73. ## 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!

74. ## math

I have more ones than tens. The value of me tens digit is 80. What number am I?

75. ## german

du hast durchfall??

76. ## 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?

77. ## Biology

How does the interaction between a carrier protein and the substance it transports resemble the interaction between an enzyme and its substrate? Use the Fit model on this.

78. ## 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?

79. ## Math

Sara estimated 23 x 43 using 20 x 40. Sam estimated 23 x 43 using 25 x 40. Whose method will give an estimate closer to the exact answer? Tell how you decided.

80. ## 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?

81. ## Algebra

A project can be completed by n workers in t days. If 56 workers need 7 days to finish the project, find the value of k - I found k. K=392 Final step - Hence, express n in terms of t. WHAT DO I DO HERE?

82. ## Math

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

83. ## math algebra

Problem Page Brian rented a truck for one day. There was a base fee of \$15.99 , and there was an additional charge of 93 cents for each mile driven. Brian had to pay \$259.65 when he returned the truck. For how many miles did he drive the truck?

84. ## Physics

Robert constructs the apparatus shown and slides a block down a slope that is without friction until the block reaches the section, L, of length 1.85 m, which begins at height h2 = 2.0 m on a ramp of angle 30.0°. In that section, the coefficient of

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 =

86. ## Math

What is 10 times as much as 700 will be 7,000

Evaluate the following expression given the function. function: h(x)=12/x problem: h(x) = -2 solution: -2 = 12/x. 1/12 * -2 = 12/x *1/12 (mulitply both sides by 1/12 to get x by itself. -2/12 = 1/x -1/6 = 1/x (simplified -2/12) I don't think this is right.

88. ## SS

How did the Mexican-American War ignite a conflict over slavery between the North and the South?

89. ## 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

90. ## 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

91. ## math

whats the last two digits of 5 to the 347 power

92. ## 8th grade math - Variations

Can you check the following, please? 1. Two minutes after a skydiver opens his parachute, he has descended 1900 feet. After 5 minutes, he descended 4750 feet. If distance varies directly with the time, at what rate is skydiver descending? Ans: to find unit

93. ## Math

It takes Beth 15 minutes to walk to school, 1/2 mile away. What is her walking pace?

94. ## 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

95. ## 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

96. ## Maths

How would you work out when this function turns and goes in a different direction? (like a turning point for a parabola): s=0.2t(t-5.1)(t-9.1)

97. ## 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 =

98. ## 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?