Bridget

Most popular questions and responses by Bridget
1. ap chemistry

Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO2 + O2 yields 2CO2 Delta H for this reaction is -566 kJ/mol run. What is the delta H for CO? 1). +270 kJ/mol 2). -110 kJ/mol 3). +65 kJ/mol 4). -405 kJ/mol 5). -65

2. Chemistry

The cell diagram for the lead-acid cell that is used in automobile and truck batteries is Pb(s) l PbSO4 (s) l H2SO4 (aq) l PbO2(s), PbSO4(s) l Pb (s) where the comma between PbO2 (s) and PbSO4 (s) denotes a heterogeneous mixture of the two solids and the

3. Math

Hey guys! Just asking for some quick help. In ABC , A is a right angle, and B = 45 degrees. What is the length of BC? If the answer is not an integer leave it in simplest radical form. The diagram has 11ft listed as height of the tall side Answers: 11ft 11

4. Chemistry

Given these standard reduction potentials at 25 C 1. Cr3+ + e- ===> Cr2+ E1=-0.407 V 2. Cr2+ + 2e- ===> Cr(s) E2=-0.913 V determine the standard reduction potential at 25C for the half-reaction equation Cr3+ + 3e- ===> Cr(s) E=? When I tried, I got 1.08V

5. Chemistry

I wrote the balanced equation for cream of tartar and baking soda: NaHCO3+KHC4H4O6->KNaC4H4)6+H2CO3 I identified the conjugate acid base pairs: NaHCO3 and H2CO3, KHC4H4O6 and KNaC4H4O6 I wrote a balanced equation for carbon dioxide gas and water:

6. math

a sample consists of the following n =6 scores: 2, 7, 4, 6, 4, and 7 compute the mean and standard deviation for the sample

7. Chemistry

What is the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen? -I found this to be C3H3O and WebAssign says it's right. I need help with part b. If the molar mass of the above compound is 110 grams/mole, what is the

8. Chemistry

Hi, This is a challenge question for my intro chemistry class and I'd really like to do it. Its in 2 parts. 1. Consider a 2790-lb automobile clocked by law-enforcement radar at a speed of 85.5 mph (miles/hour). If the position of the car is known to within

9. Chemistry

Please help me out! Gas law homework! How many liters of HCl (g) at STP can be produced from 5.44 g of Cl2 and excess H2 according to the following equation? H2 (g) + Cl2 (g) --> 2 HCl (g) Thank you so much in advance.

10. chemistry

My teacher went over it really fast and now I'm just really confused about how to do my homework =( Calculate the cell potential for the following reaction as written at 25C, given that [Cr2+] = 0.821 M and [Ni2+] = 0.0190 M. Cr(s) + Ni2+ (aq) Cr2+ (aq) +

11. Math

Suppose there are 400 students in your school class. What class rank is the 20th percentile?

12. clinical chem

How many grams of hydrated MgSO4 ⋅ 5 H20 (M.W.: MgSO4 = 119, H20 = 18) are required to make a 10% solution of MgS04

13. Differential equations in Calculus...plsssss help?

Suppose that represents the temperature of a cup of coffee set out in a room, where T is expressed in degrees Fahrenheit and t in minutes. A physical principle known as Newton’s Law of Cooling tells us that dT/dt = -1/15T+5 15T + 5. a) Supposes that T(0)

14. Chemistry-Acids

Write a balanced chemical equation to show the reaction that occurs when each weak acid reacts with water. (Omit states-of-matter from your answer. Use the lowest possible whole number coefficients.) (b) HCHO2 I've gotten a and c correct, and from that I

15. History

1) Which best describes the difference that divide Maayan and Muhammad? A. Age and interest B. physical barriers C. Culture and politics *** D. Economic status 2) How does Maayan most directly experience the conflict in Israel? A. Through treating victims

16. chemistry

15ml of 0.325M NaOH is delivered into 35ml HOBr solution of unknown concentration.The pH of the final solution is 7.48. Ka for HOBr is 2.0 x 10-9at 25C. Find the number of moles of OBr- and HOBr in the final solution.

17. Chemu

Hi! I need help with my Chem homework. "When acetylene, C2H2, burns, how many liters of O2 at STp are used for every mole of acetylene burned?" (Balanced equation: 2 C2H2 + 5 O2 --> 4 CO2 + 2 H2O)

18. physics

what is the magnitude of the resultant of a 6.0n force acting vertically upward and a 4.0n force acting horizontally

19. science

What is considered the main trunk of the respiratory system? Since this is not my area of expertise, I searched Google under the key words "'respiratory system' main trunk" to get these possible sources: http://en.wikipedia.org/wiki/Respiratory_system

20. physics

A cowboy at a ranch fills a water trough that is 1.5 meters long, 65 cm wide and 45 cm deep. He uses a hose having a diameter of 2 cm, and the water emerges from the hose at 1.5 m/s. How long does it take the cowboy to fill the trough?

21. ap chemistry ! i am so lost

how much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.8 liters against a constant external pressure of 0.0100 atm? answer in units of J

22. math

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?

23. Calculus with Diffrential Equations: Pleease help?

Suppose that represents the temperature of a cup of coffee set out in a room, where T is expressed in degrees Fahrenheit and t in minutes. A physical principle known as Newton’s Law of Cooling tells us that dT/dt = -1/15T+5 15T + 5. a) Supposes that T(0)

24. MATH##\$\$&&^^**

A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed that 33% of them had, or intended to, cheat on examinations. Find the margin of error for the 95% confidence interval.

25. ap chemistry ! i am so lost

how much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.8 liters against a constant external pressure of 0.0100 atm? answer in units of J

26. Calculus

Suppose that represents the temperature of a cup of coffee set out in a room, where T is expressed in degrees Fahrenheit and t in minutes. A physical principle known as Newton’s Law of Cooling tells us that dT/dt = -1/15T+5 15T + 5. a) Supposes that T(0)

27. math

2-2A #2 Rewrite the following using mathematical symbols: a. P is equal to the set containing a, b, c, and d. b. The set consisting of the elements 1 and 2 is a proper subset of {1, 2, 3, 4} c. The set consisting of the elements 0 and 1 is not a subset of

28. Math

Suppose that we wish to seat ten people, 5 men and 5 women, in a row of ten chairs. In how many ways can we seat the people with no restrictions?

29. math

Find the slope of the lines that are (a) parallel lines (b) perpendicular lines to the lines passing through the pair of points (3, 4)(2,-1)

30. MATH

A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following a. What scores fall between –1 and +1 standard deviation? b. What percent of all scores fall between –1 and +1 standard deviation? c. What score falls at +2

31. Statistics

About 13% of the population is left handed. If two people are randomly selected what is the probability that both are left handed?

32. Physics Electric Circuits

3. A 15.0 ohm resistor is connected in series to a 120 V generator and two 10.0 ohm resistors that are connected in parallel to each other. b) What is the current through the 15.0 ohm resistor? c) What is the current through one of the 10.0 ohm resistors?

33. Math

If two fair dice are rolled, what is the probability that a total of five shows?

34. English

In which sentence is an a homonym used correctly? 1. Karen's new dog had flees. 2. If you ask me , there's no hobby like fishing. 3. How many ours do we have to wait. 4. We had chocolate ice cream for desert.

35. Math

to the nearest hundred, what is the greatest whole number that rounds to 2,500? the least whole number?

36. math

Find the slope of the lines that are (a) parallel lines (b) perpendicular lines to the lines passing through the pair of points (3, 4)(2,-1)

37. Chem 112

Calculate the pH of a buffer solution prepared by dissolving 0.12 mole of cyanic acid, HCNO and 0.65 mole of sodium cyanate, NaCNO in enough water to make 1.0 liter of solution. [Ka(HCNO) = 2.0 × 10-4] I know that this question has something to do with

38. Math

Could someone please help me? calculate the volume in cu. ft of a section of drainage pipe that measures 8 feet in lenght and 24 inches in diameter (all measurements has to be in the same units and be careful that you distinguish between diameter and area

39. english

During the storm, Jenna hid in her basement

40. economics

How can you use information about the business cycle when making a decision about a large purchase?

41. Physics

what must be the net force if a 19.9 kg mass accelerates to the left at a rate of 2.2m/s^2?

42. geometry

I had to complete the following solution by filling in the missing statements and reasons. I filled out the statements, but am having trouble wording the last two reasons. Following solution: x-2(3x-4)=18 Statement: x-2(3x-4)=18 Reason: Given Statement:

43. Dma 040

v =1/3ah, solve for h

A women has \$500,000 invested in two rental properties. One yields an annual return of 14% on her investment, and the other returns 9% per year on her investment. Her total annual return from the two investments is \$52,000. How much is invested at each

Beta Company arranges to have Carrier Corporation transport five hundred DVD players from New York to California. Dan is Carrier's driver. Beta will suffer the loss if Carrier fails to deliver the players on time because?

46. math

Samantha was playing a fraction game where she could earn either positive or negative points on each turn.The lowest score she ever recorded was -26 2/3. The highest score was 8 3/4. Which. What expession represents the distance on a number line between

47. Art

Eugene Delacroix's Liberty leading the people commemorated?

48. math

Write equation in Standard Form Ax + By =C (-9, 7)(0, 3)

49. math

Write an equation of the line with the given slope and containing given points. Slope intercept form Slope 4 through (-3, 3)

50. dma040

v=1/3ah solve for h

51. math

what are situation and solution equations? example question is: People in a marching band stand in 8 equal rows. There are 56 people in the band. How many people are in each row?

52. Statistics

Sample salaries (in dollars) of high school teachers are listed. Find the sample mean and standard deviation of the data. 49,632 54,619 58,298 48,250 51,842 50,875 43,219 49,924

53. Chemistry 101

How do I find the mass % of Oxygen in sodium oxide?

Multiply. 1) (3t^2 - 2t - 4) * (5t + 9) Writing. 1) Explain why the product of a quadratic polynomial and a linear polynomial must be a cubic polynomial.

55. Com 220 creative writing

Quoting, Summarizing and paraphrasing sources for sexual assaul base on college dringking

56. algebra/math

i know this is probably a really simple answer and i'm gonna want to hit my head on a wall after i get it, hopefully, but how would i find a unit rate and then simplify it, if possible? like, 3 pages/5 hours? like the directions just say to write as a rate

57. arithmetic

In Jullian's garden, there are 3 rows of carrots, 2 rows of string beans,and 1 row of peas. There are 8 plants in each row. How many plants are there in all?

58. Statistics

According to a national poll conducted in 2010, seventy percent of teens reported having sent or received a text message while driving. Assume that I randomly survey 14 teens and asked them whether or not they have sent or received a text message while

59. statistics

population has mean 53 and standard deviation 12. Calculate the standard deviation of x bar for a random sample of size 12.

60. Math

Determine the equation of g(x) that results from translating the function f(x) = (x + 10)^2 to the right 12 units.

61. math

1.graph equation y=4/5x 2.graph linear equation y=-1 3.find the slope of line -2x - 3y = 5 a. slope is b. slope is undefined?

62. dma040

Police officer to Speedzilla he was speeding at or above 120 miles per hour. Write an inequality to express Speedzilla speed, then show in graph, write in set notation.

63. dma040

Solve for x. 13/14x + 8/7 = 6/7x

64. dma040

Explain which terms are alike 7xy -9x^2 -15xy^2 -14xy

65. math

how can i find the GCF of a pair of numbers ? (ie 11 18, 8 6)

66. math

how to know exponent ?

67. math

Bob is framing a rectangular picture 9 in long and 6 in wide. If the framing material costs \$1.50 per inch, what will be the total cost of the frame?

68. Finance

I am trying to figure out how to compare long-and short-term financingand then describe situations in which each type of financing would be used.

69. Economics

o Which government bodies influence national fiscal policies that potentially affect the housing market? I am thinking the federal reserve but I am really unsure about that answer.

70. vocab

write a sentences for brother's and brothers

71. math

how do i factorise a)9a^2-b^2 b)3x-8y-4xy+6

72. History!!!!!

so i have to write a closing argument paper about the whole thing with the Numberburg trial and I have to write a closing statement acting as a lawyer trying to defend and say the germans should of not been prosicuted so go the opposite and most people

73. Macroeconomics

Since all economies are faced with scarcity, how might nations attempt to minimize the human hardship associated with scarcity? By setting up some system that transfers resources from the haves to the havenots. E.g., issue food stamps, build low-income

74. History!!!

What are several reasons why there is no such thing as a war crime??? The concept is esoteric. In practice, the winner in war gets to decide what it is and who will be punished. Look up esoteric: That definition probably answers your question. This site

75. probability and Stats

How can I find standard error from each of the following: a) a proportion & a sample size? b) mean, standard deviation, and sample size? c) mean & standard deviation? thank you

76. Probability and Stats

A student was totally unprepared for a multiple-choice test and had to absolutely guess the answer to every one of the 100 questions. About what score (percent) would you expect him to earn if there were four possible answers to every question? I'm not

77. english

two balls are juggled so that each ball is in the air for 1.800s, and the second ball is thrown up at the instant the first starts down. Find the height above the throwing hand where the two balls pass eachother, assuming gEarth=9.800m/s^2 I started with

79. science

what is a vector?their structure?

80. Chemistry

A chemical formula shows the types and __blank__ of atoms in the smallest representative unit of a substance.

81. Math

If two dice are rolled, what is the probability that a total is showing more than four

82. Math

If two fair dice are rolled, what is the probability that a total of five shows?

83. life science,maths lit,geography,tourism

is it possible 4 me 2bcum a social worker?

84. math

If A=3x+4 and B=x^2+2 and C=x^2+3x-2, find the following: 1. AC+B 2. (A+B)(B-C) 3. ABC

86. Math

Determine the equation of g(x) that results from translating the function f(x) = x2 + 5 upward 6 units.

87. Math

Determine the equation of g(x) that results from translating the function f(x) = x2 + 5 upward 6 units.

88. Dma 040

V=1/3ah, V=21,h=3, solve

89. Dma 040

V=1/3ah, V=21,h=3, solve

90. Dma 040

V=1/3ah, V=21,h=3, solve

91. Dma 040

Lenth of a rectangle is 7ft longer than twice the width. If the rooms perimeter is 158ft, whay are the rooms dimensions? Width Length

92. dma040

A number subtracted from 13 is the quotient of -34and 2. Find the number

93. math

suppose that you roll a pair of 8-sided dice total of 51 times. what is the probability that you will get a sum of 5 at least 3 times

94. algerabra 1

how do you find the equation for the line containg the side opposite the side containg the first two vertices?

95. algerabra 1

how do you find the equation for the line containg the side opposite the side containg the first two vertices?

96. geometry

Need to find the perimeter in feet... The width is 35ft and 5in The length is 10ft and 3in Need to write the answer in feet... If there is anybody that can point me in the right direction.. I know I have to convert in. into feet.. and 12in= 1 foot

97. Geography

Are there 7 countries in Central America?

98. Math

solve: (square root of 3) sin(theta) + cos(theta) = 1 Thanks! :)

The ultimate goal of all the explorations launched by the Europeans from the fourteenth century onward was