# 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

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

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

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.

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.

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

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

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

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

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

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.

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

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?

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

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

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

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!

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

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?

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

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?

22. ## Science

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

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

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

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

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

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 =

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

29. ## Geometry

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

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. ## 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

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

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

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

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

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

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

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

40. ## math

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

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?

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?

43. ## physical science

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

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?

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?

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

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?

48. ## Science

What is the independent or manipulated variable in this experiment

49. ## ALGEBRA

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

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

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

52. ## Consumer math

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

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

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 :)

55. ## Math

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

56. ## algebra

\$7.80/hour = ______ cents/minute?

57. ## Chemistry

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

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?

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

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 =

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 =

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

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

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

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.

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

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.

68. ## Math

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

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,

70. ## Pre-Calculus

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

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

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.

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

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

75. ## math

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

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?

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?

78. ## Spanish 1

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

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?

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)

81. ## Math

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

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)

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

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

85. ## Math

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

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

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

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

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

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) =

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

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?

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

94. ## Language Arts

Why did Miss Suzuki visit Mieko's house

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

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

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.

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.