Wednesday

July 27, 2016
Total # Posts: 2,415

**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*

**Physics **

A child sits on the edge of a spinning merry-go-round that has a radius of 1.5 m. The childs speed is 2 m/s. What is the Child's acceleration?
*June 14, 2011*

**chemistry**

How many mL of a 4.7 M HNO3(aq) solution are required to make 500 mL of a solution with pH=2.10
*June 12, 2011*

**math**

18. A farmer planted a field of BT 123 corn and wants to estimate the yield in terms of bushel per acres. He counts 22 ears in 1/100 of acres. He determines that each ear has 700 kernels on average. He also knows that a bushel contains about 90,000 kernels on average. What is ...
*June 10, 2011*

**english**

Also another sentence was Bart, Mike, and Jim went bowling. I thought the simple subject might be Bart, Mike and Jim...but not sure
*June 10, 2011*

**english**

I have Justin and Sara, tree, she, Our, and time....hope at leasst some are correct
*June 10, 2011*

**english**

What would be the simple subject of the following sentences? Justin and Sara like to go hiking in the Rocky Mountains? This is the strangest looking tree I've ever seen! While hiding her anger as well as she could, Cindy handed the gift back to Bill. Our favorite campsite ...
*June 10, 2011*

**math**

katie makes 70% of her shots from the free throw line . can you determine how many consecutive free throws she must make in order to increase her precent. explain
*June 8, 2011*

**College physics**

The weight of the airplane is 5.54*10^4
*June 6, 2011*

**College physics**

An airplane is cruising along in a horizontal level flight at a constant velocity, heading due west. (a) If the weight of the plane is 5.54 104 N, what is the net force on the plane? (b) With what force does the air push upward on the plane?
*June 6, 2011*

**trig**

please help. show step by step how to solve h(x)=2 cot(x/2) Identify period identify x-intercepts identify asymptotes
*June 5, 2011*

**businesscommunication**

A. Background information, negative elements, main idea(s), goodwill ending, benefits.
*June 4, 2011*

**Good Reads? 6th and 7th grade**

Walk two Moons Absolutely Normal Chaos Hunger Games Series the grimm leagacy Dork Diaries
*May 24, 2011*

**chemistry**

Characteristic metallic properties similar in character to sodium (couldn’t be broken down further).
*May 21, 2011*

**trig**

Use a graph of the cosecant function to find the value of theta for which csc theta equals 1.
*May 17, 2011*

**Chemistry**

6/4 = 21.3/x solve for x.
*May 16, 2011*

**algebra**

10w+55=15w+20 -10w -10w 55=5w+20 -20 -20 35=5w /5 /5 7=w
*May 16, 2011*

**math**

sin a= 46/65
*May 11, 2011*

**Tips**

thanks
*May 11, 2011*

**Tips**

What are some tips for writing a book?
*May 11, 2011*

**Writing**

Thanks.
*May 11, 2011*

**Writing**

How do you mark thoughts in writing?
*May 11, 2011*

**MATH**

Can you give an example?
*May 10, 2011*

**College Algebra**

Change 2x^2-5x=25 to standard form. Then find the solution set.
*May 5, 2011*

**precalculus**

A Ferris wheel has a radius of 35 feet, and is rotating at 5 revolutions per minute. Find the linear speed, in feet per minute, of a seat on the Ferris wheel.
*May 4, 2011*

**Chemistry--Solids**

Silicon carbide forms which type of solid? molecular network ion-ion metallic THANKS!
*May 4, 2011*

**Chemistry!!!**

Calculate the density of a certain gas if its pressure is 0.725 atm, its molar mass is 48.22 g/mol, and the temperature of the has is 24.0 degrees Celsius
*May 3, 2011*

**calculus**

use substitution to find the indefinite integral (x^3+3x)(x^4+6x^2+8)^9dx
*May 2, 2011*

**math**

next three terms 1,5,13,29
*May 2, 2011*

**chemistry**

500 grams of water at 0 degrees C was heated to a boiling in a large pot. how much energy was needed? what was the temperature change and Heat energy
*May 2, 2011*

**Chemistry**

If 16.5 g of oxygen gas is required to inflate a balloon to a certain Volume at 26.5 degrees Celcius, what mass of oxygen gas is required to inflate the same balloon to the same volume and pressure at 10.0 degrees Celcius?
*May 2, 2011*