Friday

October 28, 2016
Total # Posts: 2,446

**chemistry**

What is the maximum amount of ethanol (in grams) that can be produced when 1.0 kg of ethylene (C2H4) and 0.014 kg of steam are placed into the reaction vessel? Ethanol (C2H5OH) is synthesized for industrial use by the following reaction, carried out at very high pressure. C2H4...

*November 1, 2011*

**chemistry**

Use Equation 7.1 and assuming that core electrons contribute 1.00 and valence electrons contribute nothing to the screening constant, S, calculate Zeff} for these two ions. Express your answers as integers. Enter your answers numerically separated by a comma. Equation 7.1: ...

*October 31, 2011*

**College Chemistry**

One mole of H2O(g) at 1.00 atm and 100.°C occupies a volume of 30.6 L. When one mole of H2O(g) is condensed to one mole of H2O(l) at 1.00 atm and 100.°C, 40.66 kJ of heat is released. If the density of H2O(l) at this temperature and pressure is 0.996 g/cm3, calculate &...

*October 31, 2011*

**College Chemistry**

As a system increases in volume, it absorbs 52.5 J of energy in the form of heat from the surroundings. The piston is working against a pressure of 0.500 atm. The final volume of the system is 58.0 L. What was the initial volume of the system if the internal energy of the ...

*October 31, 2011*

**College Chemistry**

Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 50. cm3. If the combustion of this mixture releases 955 J of energy, to what volume will the gases expand against a constant pressure of 675 torr if all the energy of combustion is...

*October 31, 2011*

**Chemistry**

Use Equation 7.1 and assuming that core electrons contribute 1.00 and valence electrons contribute nothing to the screening constant, S, calculate Zeff} for these two ions. Express your answers as integers. Enter your answers numerically separated by a comma. Equation 7.1: ...

*October 31, 2011*

**Physics**

At the beginning of a new school term, a student moves a box of books by attaching a rope to the box and pulling with a force of F = 84.4 N at an angle of 64degrees. The acceleration of gravity is 9.8 m/s/s. The box of books has a mass of 14 kg and the coefficient of kinetic ...

*October 30, 2011*

**Education 301**

I need to complete an assignment for edu 301 and I am completely lost. Can anyone help me get started? Create a flowchart, in which you create an organizational structure for the education system for the federal, state, district, and school levels. I have researched flowcharts...

*October 29, 2011*

**Chemistry**

Bond angles will be 90, 120, and 180 due to the seesaw shape created by the lone pair of electrons.

*October 28, 2011*

**science**

frontier ethic.

*October 28, 2011*

**PHYSICS PLEASE HELP !!!!!**

A roller coaster cart with a mass of 13 kg travels around two frictionless, circular loops. It just barely makes it around the top of the first circular loop which has a radius of 24 meters. It then travels around the other loop with a radius of 14 meters. What is the normal ...

*October 27, 2011*

**PHYSICS PLEASE HELP !!!!!**

A mass of 6 kg is tied to a 2 meter long rope and is swung in a vertical circle. At the bottom of the circle, the mass is moving at a speed of 16 m/s. What is the tension, in Newtons, in the rope after the mass has traveled to a point exactly halfway between the top and bottom...

*October 27, 2011*

**PHYSICS PLEASE HELP !!!!!**

An object with a mass of 13 kg slides 5 meters across a horizontal surface with a coefficient of kinetic friction of 0.38. For the duration of the slide an external force, F1, acts on the mass in the positive y direction while another force, F2, has a magnitude of 67 Newtons ...

*October 27, 2011*

**PHYSICS PLEASE HELP !!!!!**

An object with a mass of 3.7 kg slides in the positive x direction across a horizontal surface with a coefficient of kinetic friction of 0.24. During its slide a force of 364 Newtons acts on it in the positive x direction while a force of 44 Newtons acts on it in the negative ...

*October 27, 2011*

**PHYSICS PLEASE HELP !!!!!**

On some planet with a radius of 8,553 km and a mass of 5.55 x 1024 kg the planet is spinning so fast such that anything at the equator will fly off of the planet. What is the planet's period (length of a day on the planet) in hours? Please help me solve !

*October 27, 2011*

**Natural science**

What might happen to earth if the temperature in the atmosphere rises by 5degrees and if the water in the ocean gets colder?

*October 26, 2011*

**algebra**

twenty times the cost of a record, increased by eighty-nine cents

*October 26, 2011*

**PHYSICS PLEASE HELP !!!!!**

A mass of 30 kg lies on a horizontal surface with a coefficient of static friction of 0.72 and a coefficient of kinetic friction of 0.31. If a force of 25.1 Newtons is applied parallel to the surface (+x direction if you prefer), what is the magnitude of the acceleration of ...

*October 25, 2011*

**PHYSICS HELP PLEASE !!!!!**

A mass of 17 kg lies on a horizontal surface with a coefficient of static friction of 0.54 and a coefficient of kinetic friction of 0.22. If a force, F, is applied parallel to the surface (+x direction if you prefer), what is the magnitude that F needs to be to begin to move ...

*October 25, 2011*

**PHYSICS HELP PLEASE !!!!!**

A 21 kg object is placed on an incline with friction. The incline is raised slowly from zero degrees and at 60.71 degrees, the object begins to slide down the incline. What is the coefficient of static friction? Be as accurate as possible with your answer and be sure to enter ...

*October 25, 2011*

**PHYSICS HELP PLEASE !!!!!**

A 21 kg object is placed on an incline with friction. The incline is raised slowly from zero degrees and at 60.71 degrees, the object begins to slide down the incline. What is the coefficient of static friction? Be as accurate as possible with your answer and be sure to enter ...

*October 25, 2011*

**medical billing and coding**

you are a medical office manager who wants to make the cofing process easier for employees to understand. to facilitate better understnading of this process, respond to the following: come up with buzzwords or slogans that would best describe the three CPT code categories. ...

*October 25, 2011*

**PHYSICS HELP PLEASE !!!!!**

A mass of m1 = 12 kg is placed on an incline with an inclination angle of 50 degrees, a coefficient of kinetic friction of 0.16, and a coefficient of static friction of 0.89. m1 is tied to a rope which runs parallel to the incline and runs over a pulley to a hanging mass of m2...

*October 21, 2011*

**Physics.**

A mass of m1 = 12 kg is placed on an incline with an inclination angle of 50 degrees, a coefficient of kinetic friction of 0.16, and a coefficient of static friction of 0.89. m1 is tied to a rope which runs parallel to the incline and runs over a pulley to a hanging mass of m2...

*October 21, 2011*

**Physics.. please help!!!!!**

That is not right drwls

*October 20, 2011*

**physics**

A 0.82 kg physics book with dimensions of 32.4 cm by 20.1 cm is on a table. What force does the book apply to the table? Answer in units of N

*October 20, 2011*

**physics**

Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 74 kg student to accelerate downward at 9.8 m/s2, determine the upward acceleration of the Earth during the student’s fall. Answer in units of m/s2

*October 20, 2011*

**physics**

A 53.5 N object is in free fall. What is the magnitude of the net force which acts on the object? Answer in units of N What is the magnitude of the net force when the object encounters 15.4 N of air resistance? Answer in units of N What is the magnitude of the net force when ...

*October 20, 2011*

**physics**

A certain spring stretches 4.6 cm when it supports a mass of 0.55 kg . If the elastic limit is not reached, how far will it stretch when it supports amass of 8 kg ? Answer in units of cm

*October 20, 2011*

**algebra**

The length of the base of an isosceles triangle is one fourth the length of one of its legs. If the perimeter of the triangle is 16 inches, what is the length of the base?

*October 16, 2011*

**chemistry**

Acetylene gas, c2h2, burns in oxygen to produce carbon dioxide and water. If 61.4 g of co2 are produced when 22.7g c2h2 react with sufficient oxygen, what is the percent yield for the reaction?

*October 14, 2011*

**CHEmistry**

The balanced reaction equation for combustion of Mg is: 2 Mg + O2 --> 2 MgO. In the reaction vessel you have 1.0 moles of Mg and 0.30 moles of O2. What is the limiting reactant? How many moles of MgO can you possibley make?

*October 9, 2011*

**math**

Bethany has 40 apples. Write a subtraction story about the apples that would require regrouping. Then write the answer in a complete sentence.

*October 4, 2011*

**physics**

A stone falls from a cliff. It lands on the ground below the cliff after 4.2 seconds. The height of the cliff can be calculated to be what?

*October 4, 2011*

**physics**

In the equation y squaared minus 1/4 g squared t cubed, y is the displacement, t is the time, and g is the gravitational acceleration. The right hand side of the equation has units of?

*October 4, 2011*

**physics**

a rectangular barge with a flat bottom, has an area at the bottom of 4m squared. the weight of the barge plus its cargo is 5,000 newtons. what is the mass of the barge + cargo in kilograms?

*October 4, 2011*

**economics**

An increase in personal income tax rates will cause a(n)

*October 3, 2011*

**Pre-Calculus**

A rectangle is bounded by the x-axis and the semicircle y = √36 – x2, as shown in the figure below. Write the area A of the rectangle as a function of x, and determine the domain of the area function. A = all real numbers except x = 36 all real numbers except x = 6 ...

*October 2, 2011*

**Math- Probability**

in a recent year, 281 of the 290,789,000 people in the U.S. were struck by lightning. estimate the probability that a randomly selected person in the U.S would be struck by lightning this year.

*October 2, 2011*

**CHEM**

Calculate G° for each reaction using G°f values. MnO2(s) + 2 CO(g) Mn(s) + 2 CO2(g)

*September 29, 2011*

**Chemistry**

Calculate G° for each reaction using G°f values. MnO2(s) + 2 CO(g) Mn(s) + 2 CO2(g)

*September 29, 2011*

**physics**

A plane flying horizontally at a constant velocity drops a bomb on a cave from a height of 500 m. At the moment the bomb hits the ground, the plane is A.) 250 meters beyond the cave B.) Directly over the cave C.) 250 meters from the cave D.) Some other wild guess

*September 28, 2011*

**Social Study**

What kind of qualities does virgina colony have

*September 28, 2011*

**Algebra**

determine whether the ordered pair (1,10) is on the graph of the following equation Y=√x + 9

*September 24, 2011*

**Algebra**

find the intercepts and graph the equation by plotting points. Y=2-2x^2

*September 24, 2011*

**Computer Science**

Suppose that a String variable str has already been defined and holds some String. In the box provided below, write a statement that changes str to all lower case characters, and then copies the result back to str.

*September 22, 2011*

**cultural diversity**

so what is the answer

*September 20, 2011*

**spelling**

verbs, the telling part or what is happening part of a sentance

*September 20, 2011*

**writing( short story)**

can u give me another example in my writing?

*September 18, 2011*

**writing( short story)**

Can you proofread? I need some figurative language. The word limit is 750-1500 words. “Don’t go in that room,” screamed Kayla and her best friend Rebecca at the top of their lungs while watching the movie, “Martha's End.” Kayla’s mother, Tina...

*September 18, 2011*

**Algebra**

Let A(4,3) B(5,8) and C(3,10) be three points in a coordinate plane. Find the coordinates of a point D such that the points ABC and D form a parallelogram with (a)AB as one of the diagonals (b)AC as one of the diagonals (c)BC as one of the diagonals

*September 18, 2011*

**Algebra**

Find X such that the point (X, 8) is 13 units from (7, -4)

*September 18, 2011*

**Algebra**

Identify the triangle PQR as isosceles ( two sides equal length) equilateral (three sides of equal length) a right triangle, or a scalene triangle (three sides of different length)

*September 18, 2011*

**Algebra**

Find distance between the two points and the midpoint of the line segment joining them (-1,1)and (-3,-2)

*September 18, 2011*

**Science**

balance equation for lead(II) nitrate and sulfuric acid a) coefficients should be in terms of lowest whole numbers. represent substances in solutions as ions if the substances are extensively ionized

*September 18, 2011*

**math**

The diagram is 4 toothpicks each to from 3 boxes.

*September 18, 2011*

**math**

Take away 1 toothpick, move some others, and leave 1. I don't get it.

*September 18, 2011*

**Algebra**

The markup over dealer's cost of a new car ranges from 18% to 24%. If the sticker price is $14000 over what range will the dealer's cost vary?

*September 18, 2011*

**Com/155**

How do I come up with a good topic sentence to explain how the purpose, audience,tone, and content impact academic writing?

*September 16, 2011*

**Chemistry**

Simplify the following expressions. 15. 5 (5w-4w)/10 17. 6a X 5b^2/3a^3 20. (4f + 13g) (2w)

*September 12, 2011*

**Phyics - Astronomy**

You are standing at a latitude of 35 degrees South. Star x is currently at an azimuth of 45 degrees and an altitude of 50 degrees. What is the azimuth and altitude coordinates of Star X 3 hours later? I don't know how to do this. If anyone knows how to calculate this ...

*September 11, 2011*

**Math**

3,109 is the appropriate answer

*September 7, 2011*

**Physics **

a novice pilot sets a plane's controls, thinking the plane will fly at 2.5X10^2 km/h to the north. if the wind blows at 75 km/h toward the southeast, what is the planes's resultant velocity?

*September 5, 2011*

**english**

I'm doing a project that I must compare a book I've read to 1 or 2 songs. I've read the Alex Cross series by James Patterson(Cat&Mouse) and thought that Tupac would be a good comparison but I'm having trouble with what song(s) would work.

*September 4, 2011*

**Physics**

I have it graphed out, and I got the displacement in km, but I can't quite get the direction and the average velocity

*September 4, 2011*

**Physics**

Peggy drives from Cornwall to Atkins Glen in 35 min. Cornwall is 73.4 km from Illium in a direction 24° west of south. Atkins Glen is 25.1 km from Illium in a direction 13° south of west. Use Illium as your origin. (a) Draw the initial and final position vectors. (Do ...

*September 4, 2011*

**government**

none of them really helped :/

*September 2, 2011*

**government**

what is the congress doing to reduce the national deficit in the next few months?

*September 2, 2011*

**government**

what does reducing the national deficit even mean ?

*September 2, 2011*

**government **

help peopleeeeeeeeeeeeeee

*August 31, 2011*

**government **

this link just opens google it doesn't open the link u ment

*August 31, 2011*

**government **

information about the Congressional committee that will be working on reducing the national deficit in the next few months

*August 31, 2011*

**Calculus**

A parcel delivery service will deliver a package only if the length plus girth (distance around) does not exceed 84 in. What are the radius, length and volume of the largest cylindrical package that may be sent using this service?

*August 27, 2011*

**Calculus**

A man 5.50 ft tall approaches a street light 18.0 ft above the ground at a rate of 4.0 ft/s. at what rate is the end of the man's shadow moving when he is 9.0 ft from the base of the light?

*August 27, 2011*

**Chemistry **

bobpursley just to let you know I already know that number 1,2,3,4,6,8,12,15,and 18 right. I took the test and it tells me what ones I got right and what one I got wrong. So maybe it is you who successfully missed them all.... Not to be mean but I do know some things...

*August 26, 2011*

**Chemistry **

Can somebody check my answers 1. If a small piece of sodium is dropped into water, it begins to react, forming hydrogen gas and sodium hydroxide. In the equation, 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g), the sodium hydroxide that is formed is a A. compound in solution. ...

*August 26, 2011*

**Chemistry **

Can somebody check my answers? I Failed this test one time already. I do not want to fail it again. 1. When a pair of electrons is shared between two atoms, a covalent bond is said to have formed. Most often, the pair is formed A. by excess valence electrons. B. as one atom ...

*August 26, 2011*

**physical science**

A lever is used to lift a heavy load. When a 50 N force pushes one end of the lever down 1.2m the load rises .2m. Show the weight of the load is 300N ADVANTAGE of lever is input/output = 1.2/.2 = 6 W=FD W=50N*6 (b/c of advantage) = 300N

*August 17, 2011*

**algebra**

Input:1,2,3,4,5 output:3,5,9,17,33 what is the rule?

*August 16, 2011*

**algebra**

the diagonal of a rectangular room is 13ft long. one wall measures 7ft longer than the adjacent wall. what are the dimensions of the room

*August 2, 2011*

**chemistry**

A 20 gram piece of metal is added to a sample of 100 grams of water inside a calorimeter. If the metal is at a temperature of 125° Celsius and the water is at 20° Celsius, which of the following best describes what will occur inside the calorimeter?

*July 29, 2011*

**SCHOOL**

SOLVE USING ADDITION AND MULTIPLICATION PRINCIPLE 6X-7<-25

*July 24, 2011*

**algebra 2**

If y varies inversely as x, and y = 12 when x = 6, what is K, the variation constant?

*July 23, 2011*

**statistics**

Assume that 90% of the general population is right-handed. Suppose that 100 students are randomly selected. what is the probability that 84% or more is right handed

*July 14, 2011*

**business communications**

I believe it is A.

*July 14, 2011*

**physics**

Two charged dust particles exert a force of 5.3 x 10^-2 N on each other. What will be the force if they are moved so they are only one-ninth as far apart?

*July 13, 2011*

**American Gov**

Thank you D was correct :)

*July 13, 2011*

**American Gov**

The highest priority for most members of congress: A)ensuring that the constitutional system of checks and balances works properly. B)supporting his or her party's legislative platform C)getting reelected D)gaining a reputation among other members of congress as an ...

*July 13, 2011*

**American Gov**

Awesome thanks!

*July 13, 2011*

**American Gov**

The major function of Congress: A)is to check the president B)is to inform the people C)is to enact legislation D)is to check the Supreme Court Is C the correct answer?

*July 13, 2011*

**American Government**

Question about American party organizations: A. are about to die out B. Are more powerful today than any time in history C. are still, important but their role in campaigns is secondary to that of candidates D. are unimportant in the political system today Is this answer ...

*July 11, 2011*

**World History**

Ok So I redid them and got the following answers. 1. B 2. C 3. D 4. A 5. B 6. C 7. ? 8. ? 9. ? 10. B 11. C 12. D 13. A 14. C 15. A 16. C 17. B 18. D 19. D 20. A I can't seem to find the answers for 7,8,and 9....

*July 10, 2011*

**World History**

Thank You. I will look over the other answers and try to correct them.

*July 10, 2011*

**World History**

1. Among early hunting and gathering peoples, the commonly occurring mark that looks like a "P" is thought to stand for a A. favored animal B. woman. C. powerful male leader. (my answer) D. symbol for a calendar. 2. Charles Darwin supported the theory that ...

*July 10, 2011*

**Algebra 2**

Factor x^3-5x^2-50x/x^4+10x^3

*July 4, 2011*

**Algebra 2**

Simplify: 1/xy + 1/yz + 1/xz

*July 4, 2011*

**math**

A basketball player has a 40% shooting average from the free-throw line. If she takes two free throws, estimate the probability that she will make both of them. Use the following list of digits which was taken from a table of random numbers. Let the digits 0-3 represent a made...

*June 25, 2011*

**Chemistry**

Please help me with the following question: Consider the following ion; XF2-2 What is the oxidation number assigned to element “X”? Show your work I'm having trouble writing the steps.

*June 17, 2011*

**math**

In 2000,the population of Arizona was 5 million and growing continuously at a rate of 3.1% per year. Write a function f that models Arizona's population in millions x years after 2000.

*June 16, 2011*

**physics**

A man leaves his front door, walks 440 m east and 380 m north, stopping at the edge of a cliff. He then takes a penny from his pocket and drops it from the cliff, which is 20 m high. What is the magnitude of the displacement (in meters) of the penny?

*June 14, 2011*