Wednesday
July 23, 2014

Posts by Jessica


Total # Posts: 2,604

Chemistry
Classify the possible combinations of signs for a reaction's ∆H and ∆S values by the resulting spontaneity. A) Spontaneous as written at all temperatures. B) Spontaneous in reverse at all temperatures. C) Spontaneous as written above a certain temperature. D) S...

Chemistry
Calculate the pH of 100.0 mL of .0200 M pyruvic acid and .0600 M sodium pyruvate Calculate the pH of 100.0 mL of .0200 M pyruvic acid and 0.0600 M sodium pyruvate with 0.250 millimoles of H3O+ added.

math PLEASE HURRY
there are 24 students in a science class. Mr. Sato will give each pair of students 3 magnets. So far, Mr. Sato has given 9 pairs of students their 3 magnets. homw many more magents does Mr. Sato need so that each pair of students has excatly 3 magnets.

math
a developer wants to enclose a rectangular grassy lot that borders a city street for parking. If the developer has 336 feet of fencing and does not fence the side along the street, what is the largest area that can be enclosed and what are the dimensions that give this maximum...

algebra
I have no clue where to begin on this problem. Can some one help me please. One demographer believes that the population growth of a certain country is best modeled by the function P (t) =15 e^.08t, while a second demographer believes that the population growth of that same co...

Chemistry
Calculate the pH of the following 0.0500 M H3AsO4 and 0.0500 M NaH2AsO4?

Chemistry
Calculate the pH of the following 0.0500 M H3AsO4 and 0.0500 M NaH2AsO4?

chemistry
Calculate the pH of a solution made with 0.0600 M carbonic acid, H2C03 and 0.0300 M NaHCO3.

Chemistry
Calculate the pH of a solution made with 0.240 M H3PO3 and 0.480 M NaH2PO3.

6th grade math
A: 5/100 is exactly 0.05, not less. 0.05 is 5%, not 50% B. 0.7 is exactly 1/7, but 1/7 is not 10%. 10% is 1/10 C. 2/10 is 20%, not 25% and 0.9 is 90%, not 25% D. 0.3 is not 36%, it's 30%. 36/10 is 3.6, not 36%, which is 0.36. None of them seem correct. D':

science
On Apollo missions to the Moon, the command module orbited at an altitude of 150 above the lunar surface. How long did it take for the command module to complete one orbit?

physics
The drawing shows a hydraulic system used with disc brakes. The force vector F is applied perpendicularly to the brake pedal. The pedal rotates about the axis shown in the drawing and causes a force to be applied perpendicularly to the input piston (radius = 9.39 10-3 m) in th...

u.s. court system part 1
answers to penn foster exam-40600900

finance
how long will it take to double my investment with 2500 at 4% annually

Physics
A rocket, 8975 kg, traveling at 1255 m/s East explodes into two pieces. if one piece, 2450 kg, moves at 750.0 m/s due south, what is: the mass of the second piece? the momentum of the second piece? the velocity of the second piece?

statistics
In 2006, the General Social Survey asked, "Do you see yourself as someone that tends to be lazy?" For this question, 20 people said that they definitely did out of 1513 randomly selected people. What is the 95% confidence interval for the proportion of all Americans ...

Physics
A proton, moving in negative y-direction in a magnetic field , experiences a force of magnitude F, acting in the negative x direction. a) What is the direction of the magnetic field producing force? b) Does your answer change if the word proton is replaced by electron? I get a...

Chemistry
What caroxylic acid and alcohol is needed to produce isopentyl propionate?

Word Problem
A developer wants to enclose a rectangular grassy lot that borders a city street for parking. If the developer has 212 feet of fencing and does not fence the side along the street, what is the largest area that can be enclosed?

BEDMAS with decimals
30.8

Physics
An isolated segment of wire of length L=4.50 m carries a current of magnitude i=35.0 A at an angle theta=50.3 degrees with respect to a constant magnetic field with magnitude B= 6.70E-2 T. What is the magnitude of the magnetic force on the wire? a) 2.66 N b) 3.86 c) 5.60 N d) ...

Chemistry
What carboxylic acid and alcohol is needed to produce isobutyl propionate?

Chemistry
What carboxylic acid and alcohol is needed to produce propyl acetate?

Chemistry
What caroxylic acid and alcohol is needed to produce isopentyl propionate?

Physics
Suppose that the magnetic field o fthe Earth were due to a single current moving in a circle of radius 2988 km through the earth’s molten core. The strength of the Earth’s magnetic field on the surface near a magnetic pole is about 6.00E-5 T. About how large a curren...

Physics
1)A wire is carrying a current, i, in the positive y-direction. The wire is located in a uniform magnetic field, B, oriented in such a way that the magnetic force on the wire is maximized. The magnetic force acting on the wire, FB, is in the negative x direction. What is the d...

Physics
Please help me with these choose the best answers since I'm not sure of my answers. A current element produces a magnetic field in the region surrounding it. at any point in space, the magnetic field produced by this current element points in a direction that is a) radial ...

Physics
1)A wire is carrying a current, i, in the positive y-direction. The wire is located in a uniform magnetic field, B, oriented in such a way that the magnetic force on the wire is maximized. The magnetic force acting on the wire, FB, is in the negative x direction. What is the d...

Physics
Please help me with these choose the best answers since I'm not sure of my answers. A current element produces a magnetic field in the region surrounding it. at any point in space, the magnetic field produced by this current element points in a direction that is a) radial ...

Physics
1)A wire is carrying a current, i, in the positive y-direction. The wire is located in a uniform magnetic field, B, oriented in such a way that the magnetic force on the wire is maximized. The magnetic force acting on the wire, FB, is in the negative x direction. What is the d...

Physics
1)A wire is carrying a current, i, in the positive y-direction. The wire is located in a uniform magnetic field, B, oriented in such a way that the magnetic force on the wire is maximized. The magnetic force acting on the wire, FB, is in the negative x direction. What is the d...

Physics
1)A wire is carrying a current, i, in the positive y-direction. The wire is located in a uniform magnetic field, B, oriented in such a way that the magnetic force on the wire is maximized. The magnetic force acting on the wire, FB, is in the negative x direction. What is the d...

Mathematics
Determine the quadratic equation whose solutions are: 3 and -2. Explain your solution

Mathematics
In 11 years, the age of Russel will be half of the square of the age he was 13 years ago. Find his present age. Explain your solution

Physics
Two long parallel wires separated by a distance, d, carry currents in opposite directions. If the left-hand wire carries a current i/2, and the right-hand wires carries a current i, determine where the magnetic field is zero.

geometry
DEFG is an isosceles trapezoid. Find the measure of E.

math
a candy sells chocolate fudge for $4.50 for the first pound and $2.50 for each additional pound. how many pounds could be purchased with $29.00?

physics
At the airport, you pull a 18 kg suitcase across the floor with a strap that is at an angle of 41° above the horizontal. Find the normal force and the tension in the strap, given that the suitcase moves with constant speed and that the coefficient of kinetic friction betwe...

Chemistry Lab
Suppose for the reaction of Cu(NO3)2 + NaOH, you have not added enough sodium hydroxide to precipitate all the copper as copper hydroxide Cu(OH)2. a)How could you tell that not all the copper had precipitated? b)what effect would this have on the final yield?

Calculus
I get 2(sqrt3/2)(1-(3/4)1^(4/3)) But that's not the answer.

Calculus
Find the volume of the solid obtained by rotating the region bounded by y=x^3, y=1, and the y-axis and whose cross-sections perpendicular to the y axis are equilateral triangles. I asked this same question for the y-axis around the x-axis (Thanks for the explanation) but I don...

Calculus
I don't see any error, but webwork just says y= , I can't enter anything besides what y is supposed to be. The slope I took was a method I found in my book but it only says that, how to take the slope, and I don't even know if I had that right. But I cant enter any...

Calculus
Webwork asks me to enter an answer for y=

PLEASE I really need help!!!
I dont know what to do for this problem.

Calculus
Find the equation (in terms of x and y) of the tangent line to the curve r=3sin3(theta) at theta=pi/4. I dont know if I'm taking the right approach for this question but her goes what I did: I found the slope I got (9(-1/2)(sqrt3/2)+3(sqrt3/2)(1/2))/(9(-1/2)(1/2)-3(sqrt3/2...

Calculus
Find the volume of the solid obtained by rotating the region bounded by y=x^3, y=1, and the y-axis and whose cross-sections perpendicular to the y axis are equilateral triangles. I asked this same question for the y-axis around the x-axis (Thanks for the explanation) but I don...

Calculus
Find the volume of the solid obtained by rotating the region bounded by y=x^3, y=1, and the y-axis and whose cross-sections perpendicular to the y axis are equilateral triangles. I asked this same question for the y-axis around the x-axis (Thanks for the explanation) but I don...

Calculus
Find the volume of the solid obtained by rotating the region bounded by y=x^3, y=1, and the y-axis around the x-axis. What I did was: V=ç(0,1)pi(1-x^3)^2 dx v=pi(x^7/7-x^4/2+x) and I evaluated it for one since 0 is just going to be 0. and I got 9pi/14 The answer i...

Calculus
Find the volume of the solid obtained by rotating the region bounded by y=x^3, y=1, and the y-axis around the x-axis. What I did was: V=ç(0,1)pi(1-x^3)^2 dx v=pi(x^7/7-x^4/2+x) and I evaluated it for one since 0 is just going to be 0. and I got 9pi/14 The answer i...

English
I was wondering if you could help me revise this? Questions plague the mind of many readers of why exactly Tessie Hutchinson was stoned in Shirley Jackson’s, “The Lottery”. This gruesome tale tells of an innocent woman stoned in a small village of 300 people. In...

physics
Two blocks with mass m1 = 7.2 and m2 = 7.7 are connected by a massless string over a frictionless and massless pulley. The angle of the incline is equal to 45.0. The kinetic coefficient of friction between m1 and the incline is 0.22. What is the minimum value of the static fri...

English
I am writing this essay about Shirley Jackson's "The lottery" My essay is supposed to be about i think i want to talk about stoning in south africa( how long it lasted, if it still takes place, was it for punishment or for no reason) and the second body paragraph...

English Please help
i have an essay and ive been researching the topic like for freaking ever and i havent been able to fine anything "scholarly" through collins(my college's) libraries searching databases do you know any scholarly websites..?? Like literally ive been researching f...

healthcare
required annually pap smear: government is limiting those who have medicaid only to recevie the pap smear only every 3rd year but those you have private insurance it will cover it annually . what do you think opinions

Chemistry
I got 9.25527 for the pKa then for the Henderson-Hasselbalch equation: 9.00=9.25527+log(.600/acid) 10^(-.25527)=(.600/acid) .5556/.600M=acid acid=.925925...M molarity (.925925)*2.10L= 1.94 moles of NH4Cl 1.94 moles *53.4 grams=104.02g of NH4Cl

Chemistry
How many grams of dry NH4Cl need to be added to 2.10L of a 0.600M solution of ammonia,NH3 , to prepare a buffer solution that has a pH of 9.00? Kb for ammonia is 1.8x10^-5. I just wanted to make sure I dd this write, can you please check my work? Thank you!!!! I found the pKa ...

Geography
Graticules on small scale map represents ________ and ______. Graticules on large scale map represents ________ and ______.

physics
2. A tiger jumps horizontally off of a 1.7 meter tall rock with a velocity of 3.2. How far from the base of the rock does the tiger land?

english
Please tell me the anthropological perspective. Is the culture, the cross-disciplinary discipline etc? Thanks!

Biology
Using Darwin’s Theory of Evolution, describe how Eukaryotic cells could have developed from Prokaryotic cells. What advantages would the Eukaryotic cells have over the Prokaryotic?

chemistry
yes thank you the 1st one was considered strong :)

chemistry
a)H2SO4 b)CuS c)HF d)Zn(NO3)2 Which are strong, weak, or non electrolytes. I was think A was strong B and C were weak and D is non

Chemistry
Find the standard entropy (S^0) of ice at 25K. delta Hfus = 6009 J/mol and Cp of ice = 38 J/molK.

Algebra
The larger of two numbers is 23. if three times the number is 5 more than eight times the smaller, find the smaller number.

Physics
A motorist travelling at 107 km/hr is being chased by a police car at 133 km/hr. If the police car starts from 3.0 km back, how long does it take to catch the motorist? Leave time in hours

Mechanics
When a problem is statically indeterminate, what additional equations do you need to solve?

Physics
i dont get how to get rid of all the t's...

Physics
A hot air balloon is rising at a constant velocity of 13.3 m/s. When the balloon is at a height of 15 m, a heavy object is dropped overboard. IF air resistance on the object is neglected, how long does it take for it to reach the ground?

Physics
You are pulling your little sister on her sled across an icy (frictionless) surface. When you exert a constant horizontal force of 113 N, the sled has an acceleration of 1.3 m/s2 If the sled has a mass of 6.6 kg, what is the mass of your little sister?

Mechanics
What does a polar moment of inertia depend on?

Math
A triangle and trapezoid share a 15 inch base and a height of 10 inches. For what values of b is the area of the trapezoid less than twice the area of the triangle?

biology
what is activation energy?

math stats
you draw from a deck. if you get a red card you win nothing. if you get a spade you win $5. for any club you win $10 plus an extra $20 for the ace of clubs. A. create a probability model for the amount you win. B. Find the expected amount you will win. C. What would you be wil...

Statistics
A bag contains two blue, three purple, four yellow, two red, three green and one orange marbles. What is the conditional probability that, without replacement, the second marble is purple given that the first marble is green?

Statistics
A bag contains two blue, three purple, four yellow, two red, three green and one orange marbles. What is the conditional probability that, without replacement, the second marble is purple given that the first marble is green?

english writing
what does the word class means to you? Why or why not?

Chemistry
A mixture contains only CuCl2 and FeCl3. A 0.7391 g sample of the mixture is completely dissolved in water and treated with silver nitrate. if 86.91 mL of 0.1463 M silver nitrate soultion is needed to precipitate all the chloride as silver chloride, what is the weight percent ...

Chemistry
An aqueous solution with a density of 0.998 g/ml at 20 degrees Celsius is prepared by dissolving 12.8 mL of CH3CH2CH2OH (p=0.803 g/mL) in enough water to make 75.0 mL of solution calculate the percent (w/w), percent (w/v), parts per million, and molality?

Chemistry
The manufacture of ethanol (CH3CH2OH) yields diethyl ether ((C2H5)2O) as a by product. the complete combustion of a 1.005 g sample of the manufactured product yielded 1.963 g of carbon dioxide. what are the weight percents of ethanol and diethyl ether in the sample?

Chemistry
Aluminum metal and Iron(III) oxide react to give aluminum and iron metal. What is the maximum amount of Iron that can be obtained from a reaction mixture containing 2.5 grams of aluminum and 9.5 grams of Iron(III) oxide? What mass of excess reactant remains?

Chemistry
An aqueous solution with a density of 0.998 g/ml at 20 degrees Celsius is prepared by dissolving 12.8 mL of CH3CH2CH2OH (p=0.803 g/mL) in enough water to make 75.0 mL of solution calculate the molarity

History
The monroe doctrine was proclaimed in repose to revolution in____________. southern europe or latin america. I choose latin america

English
how to write a newspaper review?

english
Please tell me which of these two are Implicit statement and implicit premises or conclusions and please tell me the difference, I have quiz on this. Thanks! 1)Hilter rose to power because the Allies had crushed the German economy after workd war one. Therefore if the Allies h...

calculus
Find the slope of the curve at the indicated point. f(x)= abs(x) at a. x=2 b. x=-3 f(x)= abs(x-2) at a. x-1

history
i'm sorry it's suppose to be.... was the proposed capitol philadelphia

history
Before the change to a site on the potomac the was the proposed capitol philadelphia?

Math
The ratio of a rectangle is 3:4, its perimeter is 32in. What are the lengths of the sides?

trig
Find a cofunction with the same value as sin 19 degrees

help please
The pattern of learning that is strongest is called : A.learning modality B.intelligence activity C.learning style D.both a&c I got c what do you think?

help please
A is correct answer or not?

United States Government
Which of the following would NOT be advocated by modern conservatism? a. Free markets b. Small governments c. Laissez-faire economics d. Welfare programs e. Reliance on tradition I would say Reliance on tradition. what say?

Algebra II
I need to write a polynomial in SIMPLEST FORM having roots 2,-2 and 4. I have to gt rid of the parentheses by multiplying everything out.Did I do it correctly? Also, someone said yes yesterday , but I'm wondering if it is suppose to have anything else done to it-it seems ...

algebra II
I need to write a polynomial in SIMPLEST FORM having roots 2,-2 and 4. I have to gt rid of the parentheses by multiplying everything out.Did I do it correctly? Also, someone said yes, but I'm wondering if it suppose to have anything else done to it-it seems way too easy t...

chemistry
analyze and explain the buffer system in buffered aspirin(carboxyic acid)

Algebra II
I need to write a polynomial in SIMPLEST FORM having roots 2,-2 and 4. I have to gt rid of the parentheses by multiplying everything out.Did I do it correctly? Also, someone said yes, but I'm wondering if it suppose to have anything else done to it-it seems way too easy th...

Algebra II-Please recheck
Is that in simplest form or am I suppose to do something else with it? It seems too easy-

Algebra II
the first step should be x^2+2x-2x-4 = x^2-4(I forgot to put the (-4)

Algebra II
I need to write a polynomial in SIMPLEST FORM having roots 2,-2 and 4. I have to gt rid of the parentheses by multiplying everything out.Did I do it correctly? (x-2)(x+2)(x-4)original problem 1.x^2 + 2x-2x=x^2-4) 2. (x^2-4)(x-4) 3. x^3-4x^2-4x+16=0

government
first result was this page XD

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