Wendy

1. Chemistry

Nitroglycerin C3H5(NO3)2 is a common explosive which decomposes according to the equation. 4C3H5(NO3)2 - 12CO2 + 10H2O + O2 +6N2 ΔH= -5.720*10^3 KJ. Calculate the heat for the decomposition for the 10.6g of the Nitroglycerin.
2. Chemistry

Given that 4NH3+5O2-4NO+6H2O ΔH= -906kJ. What is the Enthalpy change for NO +3/2H2O - NH3 +5/2 O2
3. Science

Ascorbic C3H7O4COOH,also known as VitaminC, is an essential Vitamin for all mammals. Among mammals, only humans, monkeys and guinea pigs cannot synthesis it in their bodies LA for ascorbic acid is 7.9*10^-5. Calculate [H3O+] and pH in a 0.110M solution of
4. Science

Find out the energy of emitted photon when an electron in Li2+ ion returns to its ground state from n=2 level.
5. Chemistry

Some plants require acidic soils for healthy growth. Which of the following could be added to soil around such plants to increase the acidity of the soil? 1.iron(ii)sulphate 2. sodium sulphate 3.aluminum sulphate 4.iron(iii)sulphate 5.caesium sulphate.
6. Chemistry

Calculate hydroxyl ion concentration, ph and the percent hydrolysis for 0.1M solution of sodium cyanide (hints know for cyanide ion is 2.5*10^-5).
7. Chemistry

Determine the vapour pressure lowering at 25 degree Celsius of 1.25molality sucrose solution assume the solution behaves ideally (sucrose is C12H22O11). The vapour pressure of pure water at 25 degrees Celsius is 23.8torr ( hint 50.0g of sucrose was used).
8. Chemistry

The density of a 15.00% by mass aqeous solution of acetic acid is 1.0181g/mL What(i)the molarity (ii)molality (iii) the mole fraction of each component?
9. Chemistry

What must be a concentration of benzoate ion in a 0.55M benzoic acid solution so that the ph is 5.00?
10. stats

Assume that​ women's heights are normally distributed with a mean given by mu equals 63.4 in​, and a standard deviation given by sigma equals 1.8 in. Complete parts a and b. a. If 1 woman is randomly​ selected, find the probability that her height is
11. Chemistry

How much heat is required to warm 122g of water by 23.0°C? Specific heat is 4.184 J/g° C. Please show work:(((
12. I love math science

Label all the part of speech in the sentence
13. math

Naya has a number riddle for you to solve: The number has two digits, it is less than 40, you say it when you count by fives and the sum of the digits is 25.
14. Math

Betty decides to support local artists by hanging their artwork in her shop. When decorating the coffee shop, Betty comes across the following formula for placing pictures on her walls: 1/3 |a-12|+ 2/3|a|where a equals the number of pictures that she would
15. algebra

Betty is in the process of opening her own business – a coffee shop in downtown Fargo, North Dakota. With the Grand Opening a month away, she runs the numbers involved in her upfront expenses: \$5,400 for local advertising, \$2,700 for the security deposit
16. chemistry

WHAT IS THE RATIO OF THE NUMBER OF MOLECULES IN 71 GRAMS OF CHLORINE TO THE NUMBER OF MOLECULES IN 2 GRAMS OF HYDROGEN
17. chemistry

1,2 of carbon combined with 0,1 grams of hydrogen to form a compound . a.FIND THE EMPIRICAL FORMULA OF A COMPOUND b.ITS Mr WAS FOUND TO BE 78 ,FIND THE MOLECULAR FORMULA
18. stats

Suppose we had two families, where Family A included 5 children and Family B included only 1 child. If we randomly chose a child from the families, what is the probability that the child came from Family A?
19. math

The Gallup Poll uses a procedure called random digit dialing, which creates phone numbers based on a list of all area codes in America in conjunction with the associated number of residential households in each area code. Give a possible reason the Gallup
20. Calculus

Thank you - (Enter your answers using interval notation. If an answer does not exist, enter DNE.) y = 4x + [5/sin x], (−π, π) concave upward (x,y)- concave downward (x,y)-
21. Health

Blood also passes through the small intestine and liver during which type of circulation pulmonary renal portal*** cardiac
22. Pre-cal

Solving the principle values of x of the equation 4cos^2x-3=0
23. Life science, Life science and History

I want to be a doctor (immunologist) I'm not sure about the last subject should it be history or Geography
24. helpppp

Write an equation of the line passing through (3,21)and (-4,-35) in the form of A x + B y = C. Where A, B and C are real numbers
25. algebra

A national home improvement store's revenue y (in millions of dollars) during the years from 1996 to 2007 is given by the equation y=15x+55 where x is the number of years after 1996. a)Use the equation above or a graph of the equation to complete the
26. Algebra. NEED HELP ASAP PLEASE

The fourth month this year, you have \$368 saved. At the twelfth month this year, you have saved \$504. What is your savings rate?

A city is considering building a commuter train. The steepest section of track has a fall of 72.8 feet for a horizontal distance of 280 feet. What is the grade of this section of track? The downgrade of this section of track as a reduced fraction is?
28. math

A is 100m away from headquarters. B is 8m away from headquarters. A runs twice as fast as B. How far away from headquarters will B be when A arrives at headquarters. I drew a number line and did a jump of 16 for A and a jump of 8 for B. This brings A to
29. Algebra/Math

The difference of two numbers is 29. If five times the smaller number is twice the larger, the result will be one. What is the larger number ? Please help.. I need an answer in 10 days. Thank you, much appreciations.
30. algebra

A 74-foot length of wire is to be cut into 2 pieces, so that the longer piece is four feet longer than six times the shorter piece. Find the length of each piece.
31. algebra

A local salesman receives a base salary of \$900 monthly. He also receives a commission of 7% on all sales over \$1000. How much would he have to sell in a month if he needed to have a monthly income of \$2900?
32. Math

Sheryl gets paid time and a half for working overtime at her job. Last week she worked 47 hours and her paycheck was \$375.78. What is her normal hourly rate? Please help with figuring what formula I need to get the answer. Thanks
33. math

Alvin can go upstream at a rate of 6 miles per hour and downstream at a rate of 12 miles per hour. One day while Alvin was on the river, he received a call telling him he needs to turn around and come home. So he turned around and went back to his starting
34. math

We are planning a reception for our daughter. The hall that we are renting charges a \$70 cleanup fee. In addition to the cleanup fee, they charge \$28 per guest for food and drinks. If we have \$1,800.00 available, what is the maximum number of guest we can
35. Math/Physics

I am unsure of what exactly I am looking for in this problem... One of the highlights of the Calaveras Fair, besides the bullfrog jumping contest, is the watermelon seed spitting contest. The seed spitting is being done in the direction of s ⃗=5i ⃗+j
36. geometry

hat is the area of a regular octagon with a side length of 5 meters and a distance from the center to a vertex of 6.5 meters?

Lisa rowed her boat for two miles downstream. The trip took her 20 minutes. She then turned around and rowed back the two miles. It took her one hour to row back upstream. a. At what rate of speed did Lisa row downstream? b. At what rate of speed did Lisa
38. Math

Lisa rowed her boat for two miles downstream. The trip took her 20 minutes. She then turned around and rowed back the two miles. It took her one hour to row back upstream. a. At what rate of speed did Lisa row downstream? b. At what rate of speed did Lisa
39. Math

Below are the dimensions of an assortment of rectangles. Which rectangle has dimensions that are similar to a rectangle that has a dimension 2 times 5? Assume that all the units are identical. 5 times 8 6 times 9 4 times 10 1 times 10 8 times 20 10 times 4
40. Math

Lisa rowed her boat for two miles downstream. The trip took her 20 minutes. She then turned around and rowed back the two miles. It took her one hour to row back upstream. a. At what rate of speed did Lisa row downstream? b. At what rate of speed did Lisa
41. Math

Jacob stands 4.5 feet tall and casts a 2.7 foot shadow. A. Using this relationship, determine how tall Jacob's house is if the house's shadow measures 19.2 feet. Assume the triangles are similar. B. Explain the concept of indirect measurement and how it is
42. Math

Ernesto drew a map of his school. He used a scale of 1 inch: 50 feet. What distance in inches on Ernesto's map should represent the 625 feet between the cafeteria and the science lab?
43. Math

If you are making a model of your bedroom, which would be an appropriate scale: 1 inch = 2 feet, or 1 inch = 12 feet? Explain. Please help me
44. Math

Explain how you could use a map to estimate the actual distance between Miami, Florida, and Atlanta, Georgia.
45. math

If you are making a model of your bedroom, which would be an appropriate scale: 1 inch = 2 feet, or 1 inch = 12 feet? Explain.
46. Math

If the number in the numerator of a unit rate is 1, what does this indicate about the equivalent unit rates? give an example
47. Math

Wendell is making punch for a party. the recipe he is using says to mix 4 cups pineapple juice, 8 cups orange juice, and 12 cups lemon-lime soda in order to make 18 servings of punch. a. How many cups of punch does the recipe make? b. if Wendell makes 108
48. Math

Karl's scores on the first five science tests are shown in the table. Test 1 Test 2 Test 3 Test 4 Test 5 85 84 90 95 88 Part A. Write am inequality that represents how to find the score he must receive on the sixth test to have an average score of more
49. Math

You score 15,16,17,14, and 19 points out of 20 possible points on five tests. what must you score on the sixth test to have of at least 16 points?
50. math

What is 4x-12?
51. Math

Which of the following situations corresponds to the equation below? 1/3x + 8 = 18 2/3 Keneda is packing some suitcases to take on a cruise. The cruise line allows each guest to bring up to three pieces of luggage with a limit on total weight. So far, she
52. math

Silas took 15 bags of glass to the recycling center on Monday. He took 6 bags of plastic to the recycling center on Tuesday. Which equation could be used to find x, the total number of bags of glass and plastic Silas took to the recycling center? A. x - 15
53. Calculus

The following rational function describes concentration in blood of a certain medicine taken once depending on time, find: A) the horizontal or oblique asymptote B) the vertical asymptote, if any C) describe their meanings f(x)=x/x^2-100
54. Math

Mr. Lee invested some money. Lost 4% in a stock and gained 3.2% in a bond. Overall he lost 11.2\$. If he invested the amount in the stock to the bond vice versa, then he wouldve gained \$3.2, how much is in the bond and how much is in the stock? I am so
55. English

Another question regarding the poem Annabel Lee. Can you check my response for me and help me elaborate on the rhythm explanation please; 1. What is the overall tone of the poem? How does the rhythm of the poem affect the tone? my ans: The tone of the poem
56. English

I am stuck on these two questions(can you check #1 one over for me?)! For the poem Annabel Lee; 1. What romanticized explanation does the speaker give for the death of his love, Annabel Lee? He tells us that angels from heaven were jealous of their love
57. English

I am "applying"(practicing writing resumes in english) for a leadership position at a local non profit and I am writing my cover letter, expressing why I want to serve as a president or marketing director. Though this is my first time taking on an exec

Wouldn't a "administrative assistant I" be considered a non-exempt employee? Non-exempt employees are covered by overtime provisions of the FSLA act and must be paid overtime for all hours worked over 40.

Wouldnt a "Administrative Assistant I" be considered as a non-exempt job??
60. French Grammar

Can someone please check these 4 sentences? a. La bibliothèque à New York est plus grande que la bibliothèque à Paris. b. Les résidences des New York sont plus moderns que les résidences de Paris. c. Le campus de New York est moins intéressant que
61. math

building A is 180 feet shorter than building B. The total height of the two building is1480 feet. find the length of each building
62. Chemistry

I posted this question earlier but the person that answered did not include how to find the moles of the problem When 80.0 mL of HCl is added to 80.0 mL of NH3OH, the temperature increases 2.5 celsius. Assuming the final solution has the same specific heat
63. Chemistry

When 80.0 mL of HCl is added to 80.0 mL of NH3OH, the temperature increases 2.5 celsius. Assuming the final solution has the same specific heat capacity as liquid water, the heat produced in the reaction between two solutions is: I don't know how to find
64. Chemistry

When 80.0 mL of HCl is added to 80.0 mL of NH3OH, the temperature increases 2.5 celsius. Assuming the final solution has the same specific heat capacity as liquid water, the heat produced in the reaction between two solutions is: I don't get how to find
65. chemistry

What will be the final temperature of 650 g of water initially at 5.5°C if it is heated by burning 7.5 g of carbon to carbon dioxide. The molar heat of reaction is -393.5 kJ/mol. I do not understand how to do this question
66. chemistry

How many moles of H2S would we expect to be formed by reaction if 3.50 moles of HNO3 reacted completely?
67. Math

1. The ratio of the number of dimes to the number of pennies in a purse is 3 to 4. If 3 pennies are taken out of the purse, the number of dimes and the number of pennies in the purse will be equal. How many dimes are in the purse? (Answer key says 9- and
68. chemistry

What physical property of water and HCl allows us to separate them from the zinc chlorine compound produced in the reaction?
69. chemistry

what is shorthanded configuration of Mg and Cl
70. Math

Hello! Can you check my answers for these questions? Thank you in advance (= 1. The following ordered pairs give the scores on two consecutive 15-point quizzes for a class of 18 students. (7, 13), (9, 7), (14, 14), (15, 15), (10, 15), (9, 7), (14, 11),
71. Math \ Algebra

Hello! Can you check my answers for these questions? Thank you in advance (= 1. The following ordered pairs give the scores on two consecutive 15-point quizzes for a class of 18 students. (7, 13), (9, 7), (14, 14), (15, 15), (10, 15), (9, 7), (14, 11),
72. Math( Attn: Reiny)

1. A rental business charges \$12 per canoe and averages 36 rentals a day. For every 50-cent increase in rental price, it will lose two rentals a day. What price would yield the maximun revenue? I was told the answer by Reiny, but I couldn't get the right
73. Math

1. If the point (-3,30) is on the graph y=(x-1)^2+14, where will the point be on y=(x-8)^2-6? I don't understand what this is asking and how I can find this. 2. A rental business charges \$12 per canoe and averages 36 rentals a day. For every 50-cent
74. Physics

A rabbit runs in a straight line with a velocity of +1.3 m/s for a period of time, rests for 11 s, and then runs again along the same line at +0.65 m/s for an unknown amount of time. The rabbit travels a total distance of 1080 m, and its average speed is
75. Math

The sum of multiples of 6 between 6 & 999? I got 83166, but my answer key says 82665.. Is my answer wrong? I used the term formula to find 166 terms multiples of 6, and then the sum formula to get 83166.
76. English

I have an essay and my topic is "our views of the past change as we mature". So I am stuck on what pieces of evidence I should write about. I am thinking of writing a narrative, and I want my "mature view" to be that the world doesn't evolve around me
77. Math

Which decimal value is equivalent to 7/11? _ __ _ A. 0.63 B. 0.63 C. 0.675 D. 0.7 "B" is what I chose.
78. Chemistry

Adding helium to a balloon increased its volume from 360.9 mL to 3.532 L. If the final number of moles of helium in the balloon is 22.3 mol, what was the initial number of moles of helium in the balloon? Assume the balloon contained only helium initially.
79. Chem

A flexible container at an initial volume of 5.12 L contains 7.51 mol of gas. More gas is then added to the container until it reaches a final volume of 18.3 L. Assuming the pressure and temperature of the gas remain constant, calculate the number of moles
80. Chem

If 66.5 mol of an ideal gas is at 5.97 atm and 335 K, what is the volume of the gas?
81. physics

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials’ boat pulls up next to the spy’s boat, both boats reach the edge of a 4.5m waterfall. The spy’s speed is 16 m/s and the officials’
82. physics 1

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials' boat pulls up next to the spy's boat, both boats reach the edge of a 4.5m waterfall. The spy's speed is 16m/s and the official's speed is
83. Language arts

Write about a time when you had a change of heart!!! The way you could help is by giving me some examples.
84. Physics

Bill kicks a rock off the top of his apartment building. It strikes a window across the street 15m away. The acceleration of gravity is 9.8 m/s^2. If the window is 13m below the position where Bill contacted the rock, how long was it in the air?
85. chemistry

3Cl2 +6KOH->KClO3 +5KCl =3H2O write a conversion factor that could be used to convert between moles od potassium hydroxide and moles of potassium chlorate
86. PHYSICS

What magnitude is not possible when a vector of magnitude 3 is added to a vector of magnitude 4?
87. Physics

what are vector quantities?
88. PHYSICS

A person walks 10.4 degrees north of east for 4.19 km. Another person walks due north, then due east to arrive at the same location. How far would this person walk due east? Answer in units of km
89. PHYSICS

A person walks 10.4 degrees north of east for 4.19km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? Answer in units of km.
90. Physics

A person walks 10.4 degrees north of east for 4.19 km. Another person walks due north, then due east to arrive at the same location. How far would this person walk due east? Answer in units of km
91. Physics

A person walks 10.4 degrees north of east for 4.19km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? Answer in units of km.
92. physics

which of acceleration age speed temperature and velocity are vector quantities
93. physics

A vector representing 170 N is oriented at 30 degrees with the horizontal. What is the magnitude of the vertical component? Answer in units of N,
94. Physics

A vector representing 170 N is oriented at 30 degrees with the horizontal. What is the magnitude of its horizontal component? Answer in units of N.
95. AP Physics 1

A cat climbs 8m directly up a tree. What is the horizontal component of the cat's displacement? Answer in units of m.
96. statistics

The tread life a certain brand of tires is known to be normally distributed with a mean of 60,000 miles and a standard deviation of 5,000 miles. The company wishes to set the warranty so that only 4% of the tires will need to be replaced. What should the

Two toy ducks attached to each other by a string, are being pulled by a child. The front duck is m1= 5.0 kg and the back duck is m2= 2.0 kg. The happy guy pulls them with a force of 10 N and friction exists. The toys are moving with constant velocity. A)
98. science

How to manipulate the formulas of momentum, fore, acceleration