Thursday

March 26, 2015

March 26, 2015

Total # Posts: 958

**chemistry **

The enthalpy of formation of MX is ΔHf° = –493 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 143 kJ/mol. The ionization energy of M is IE = 437 kJ/mol. The electron affinity of X is ΔHEA = –317 kJ/mol. (Refer to the hint). The bond energy of ...
*March 16, 2015*

**chemistry**

OK thank you! I'm gonna ace this test!:)
*March 8, 2015*

**chemistry**

Yes I do know them but I don't get the parts with the parentheses. What do they mean?
*March 8, 2015*

**chemistry**

Write and balance each of the following equations, and then identify each by type. a) copper+chlorine-->copper(ll)chloride b) calcium chlorate--->calcium chloride+oxygen c)lithium+water--->lithium hydroxide+hydrogen d)lead(ll)carbonate--->lead(ll)oxide+carbon ...
*March 8, 2015*

**chemistry**

What do the parentheses mean like for example in lead(ll)oxide, though?
*March 8, 2015*

**chemistry**

Write and balance each of the following equations, and then identify each by type. a) copper+chlorine-->copper(ll)chloride b) calcium chlorate--->calcium chloride+oxygen c)lithium+water--->lithium hydroxide+hydrogen d)lead(ll)carbonate--->lead(ll)oxide+carbon ...
*March 8, 2015*

**Chemistry**

In de Broglie's equation w=wavelength w=h/mv how do i rearrange to solve for mass
*March 8, 2015*

**ELA**

ok thank you
*March 1, 2015*

**ELA**

in the article " Letter From Jackie Robinson on Civil Rights " for short response 1 I cant find what African americans want to recive and the details that support it. and for short response 2 I cant find how president Eisenhower unknowingly crush the spirit of ...
*March 1, 2015*

**algebra**

6(5y-4) 30y-24 -3+2(6z-3+4)
*February 24, 2015*

**science**

What are the transporters of protein in plants?
*February 18, 2015*

**physics**

A snowmobile is originally at the point with position vector 26.1 m at 95.0° counterclockwise from the x axis, moving with velocity 4.25 m/s at 40.0°. It moves with constant acceleration 1.73 m/s2 at 200°. After 5.00 s have elapsed, find the velocity vector, and ...
*February 4, 2015*

**Trigonometry**

point A and B are 100m apart and are of the same as the foot of a building. the angle of elevation of the top of the building from point A an B are 21 degrees and 32 degree respectively. how far is A from the building
*February 4, 2015*

**calculus**

Hello! Just needed help with understanding this specific question. We never really wet over Euler's method so I'm not sure how to go about it. "Use Euler's method in order to solve the initial value problem below. dy/dx = x-3 and y=4 when x=1 Use Euler's ...
*February 3, 2015*

**History**

1)C 2)D
*February 3, 2015*

**History**

In which Sumerian city was the most famous ziggurat located? A. Uruk B. Kish C. Lagash D. Ur
*February 3, 2015*

**Chemistry**

Assuming equal concentrations and complete dissociation, rank these aqueous solutions by their freezing points. CoCl3 K2CO3 KNO3
*January 29, 2015*

**calculus**

I needed help with this graphing calculator assignment; my sister took my calculator so I don't really have anything to work with, unfortunately. The graphing calculators online are really confusing and seem to require payment to work - so i'm pretty desperate. just ...
*January 20, 2015*

**economics**

if you could verify/falsify my answers on these multiple choice questions and possible give me insight on possible correct answers, that would be great. thanks! 1. Which is an acceptable market method of regulating negative externalities? A. Legal action against the source ...
*January 6, 2015*

**Geometry**

Original Statement "If it's a garage sale, then it's a Sunday." Statement 1 "If it's a Sunday, then it's a garage sale." Statement 2 "If it's not a Sunday, then it's not a garage sale." Statement 3 "If it's not a ...
*November 19, 2014*

**Human Geography**

Discuss the origin, diffusion, and impact on the cultural landscape for one of the following: A) folk housing styles in the United States. B) Buddhism in Asia. C) English in South Asia. Anyway I can get help with this? I have an FRQ due thursday and need help answering these.
*November 18, 2014*

**chemistry**

how many moles of no2 remain when 2.5 moles of n205 completely react
*November 3, 2014*

**English **

Read the following passage and identify at least 3 elements of figurative language; explain how each element brings out the theme of the passage. "The Wrong Place" by Susan Michalski Lana woke up, curled in a corner of the seat at the back of the train. She lifted ...
*November 2, 2014*

**Chemistry**

In a constant-pressure calorimetry experiment, a reaction gives off 20.8 kJ of heat. The calorimeter contains 150 g of water, initially at 21.4 degrees Celsius. What is the final temperature of the water? The heat capacity of the calorimeter is negligibly small.
*October 30, 2014*

**AP Chem**

NH3 + CO2 + H2O are introduced into an empty 1.00L vessel at 115 degrees. The initial partial pressure of at .500 atm. Calculate the number of moles of of solid (NH4)2CO3 that is present when equilibrium is established?
*October 28, 2014*

**AP Chem**

(NH4)2CO3 <-> 2NH3 + CO2 + H2O solid (NH4)2CO3 is placed in an evacuated container at 115C. When equilibrium is reached Kp = 1.93x10^-3. Extra NH3 gas is added, when equilibrium is reestablished, the partial pressure of NH3 is four times the partial pressure of H20. What...
*October 28, 2014*

**AP Chem**

solid (NH4)2CO3 is placed in an evacuated container at 115C. When equilibrium is reached the total pressure inside the vessel is 0.473 atm. Some solid remain in the vessel at equilibrium. Calculate Kp.
*October 28, 2014*

**chemistry**

1. A gas cylinder contains 0.722 mL of hydrogen gas at a pressure of 10.6 atm. If the gas is used to fill a balloon at a pressure of 0.960 atm, what is the volume of the filled balloon?
*October 28, 2014*

**Math**

A sixth grader weighs 90 pounds which is 120% of what he weighed in 4 th grade. How much did he weigh in 4th grade? 90x100=9000/120= 75 So he weighed 75lbs is this correct?
*October 5, 2014*

**Math**

In a parking lot 16% of the cars are blue. There are 4 blue cars in the lot. How many cars are not blue? 4x100=400\16= 25 then minus 4 blue cars to get the answer that 21 of the cars are not blue. I know the answer is 21 I'm just not sure if the work is correct?
*October 5, 2014*

**Calculus**

At what point does the normal to y=-5-1x+3x^2 at (1, -3 ) intersect the parabola a second time? Answer: Note: You should enter a cartesian coordinate. The normal line is perpendicular to the tangent line. If two lines are perpendicular their slopes are negative reciprocals -- ...
*September 24, 2014*

**Physics**

Obi-Wan lands his spacecraft on an unknown planet. Visibility is poor, so he isn't able to exactly determine on which planet he has landed. He finds someone on a local communications channel and asks for directions to Earth. "You are already on Earth," is the ...
*September 21, 2014*

**Physics **

The two masses shown in the figure are each initially 1.80 m above the ground, and the massless frictionless pulley is fixed 4.8 m above the ground. (mA = 1.5 kg and mB = 3.4 kg.) What maximum height does the lighter object reach after the system is released? [Hint: First ...
*September 21, 2014*

**math**

1. A grayhound's maximum speed is 39.35 mph how long does it take to run a quarter mile? 2. A human's maximum speed is 27.89 mph how long does it take to run a quarter mile? 3. A giant tortoise's maximum speed is 0.17 mph how long does it take to run a quarter mile...
*September 11, 2014*

**physics**

A rocket rises vertically, from rest, with an acceleration of 3.2 m/s2 until it runs out of fuel at an altitude of 730m . After this point, its acceleration is that of gravity, downward.whats the maximum altitude does the rocket reach?
*September 10, 2014*

**Biochemistry**

If you make up a solution of 100mL of 0.1 M Hepes in the basic form, what will be the pH? pKa = 7.55
*September 8, 2014*

**physics**

Student throws a baseball at a large gong 79 miles away and hears the sound of gong 2.63333 seconds later. The speed of sound in air is 330 miles per second. What was the average speed of baseball on its way to gong ?
*September 3, 2014*

**math**

John and Mary Billings own a condominium with an assessed value of $110,000. If the tax rate is 25 mills per $1.00 of assessed valuation, how much tax do they pay?
*June 24, 2014*

**Statistics**

Who is the king of late night TV? An Internet survey estimates that, when given a choice between David Letterman and Jay Leno, 52% of the population prefers to watch Jay Leno. Suppose that you randomly select three late night TV watchers and ask them which of the two talk show...
*May 22, 2014*

**economics**

Looking for examples on the four production factors within a service environment
*May 20, 2014*

**English**

Which of the following sentences is grammatically correct? a.Only Bill wanted to go to the lake. [Intended meaning: Bill wanted to go to the lake, but no one else did.] b.Bill only hinted that he would help us move. [Intended meaning: Bill hinted but did not, for example, ...
*May 10, 2014*

**Investments**

P4.3 Assuming you purchased a share of stock for $50 one year ago, sold it today for $60, and during the year received three dividend payments totaling $2.70, calculated the following: (a) Income (b) Capital Gain (or loss) (c) Total Return in Dollars (d) Total Return as a ...
*April 24, 2014*

**Chemistry **

What volume in liters of C3H7Cl is produced if 400.0g of C3H8 (propane) reacts with excess chlorine gas according to the equation C3H8+ Cl2 --> C3H7Cl+HCl
*April 15, 2014*

**Math**

Jason Printing has $85,000 to invest. They can invest in Wilder Revenue at 10% compounded semiannually or at Cheapskate Investments at 9.8% compounded monthly. a) Calculate the two APYs and compare them to determine your answer. Make sure to distinguish which APY belongs to ...
*April 13, 2014*

**algebra**

A baseball player hits a ball toward the outfield. The height h of the ball in feet is modeled by h(t) = -16t2 + 22t + 3, where t is the time in seconds. In addition, the function d(t) = 85t models the horizontal distance d traveled by the ball. If no one catches the ball, how...
*April 1, 2014*

**chemistry**

Hg2Cl2 = Hg + HgCl2 Please help me write the two half equations for this.
*March 31, 2014*

**Chemistry**

How many grams of C would be necessary to produce 790. grams of CaCO3 by the sequence of reactions shown below? Step 1: CaO + 3C → CaC2 + CO Step 2: CaC2 + N2 → CaCN2 + C Step 3: CaCN2 + 3H2O → CaCO3 + 2NH3
*March 27, 2014*

**Pre-Calc**

Eliminate the parameter x = abs(t-3) and y = t + 3...how do you undo the absolute value in order to get y=?
*March 2, 2014*

**Math**

Thank you
*February 26, 2014*

**algebra**

Find a slope of a snowboarding beginner hill that decreases 24 feet vertically for every 30 foot horizontal increase
*February 13, 2014*

**Science**

1. A 2. C 3. A 4. C 5. D
*February 3, 2014*

**math**

A model plane is 1/48 the size of the actual plane.if the model plane is 28 inches long how long it's the actual plane
*January 23, 2014*

**World History**

What was the anaconda Plan
*January 20, 2014*

**Writing**

Ok Hack. Thank you. Ill try it and c how it works out. :)
*January 16, 2014*

**Writing**

what is a good opening sentence to a short story? no matter what genre im writing? plz help me. from a girls point of view.
*January 16, 2014*

**Writing?!**

thanks. you guys helped me a lot. i got tons of ideas i hope the story will be fine.
*January 13, 2014*

**Writing?!**

does anyone know good realistic fiction topics and conflicts? i love writing but have a hard time with this genre because everything has to be able to occur in real life. :( im better at fake stuff. So plz plz help me!
*January 13, 2014*

**Novel Help**

Hey, realistic fiction can really occur. Im not a fan either i love to write but not realistic fiction! Maybe a girl ran away when he parents get into a car crash or she decided to commit suicide because she thinks she is alone. Hope it helps! :)
*January 13, 2014*

**history**

Can someone please help me? :) 1. Which of the following best describes the beliefs of Andrew Jackson? (1 point) States’ rights should be exercised over federal law. Federal funds should be kept in a national bank. The nation should have a strong federal government. Force...
*January 7, 2014*

**Science**

I don't understand, which ones did you get wrong?
*January 5, 2014*

**Math**

The distance traveled (in meters) by the Oregon slug can be modeled by the function f(t) = 0.9t, where t is the time in minutes. Find the distance traveled in 27.5 minutes.
*December 18, 2013*

**Physics**

A spring (k=302 N/m) placed vertically on a surface has a 548 g ball placed on top of it. How far must the spring be compressed in order for the ball to be traveling at a speed of 2.8 m/s when it is located 438 cm above its initial position?
*December 15, 2013*

**math**

I do not get how you got 3times as much when they aren't fully simplified.
*December 14, 2013*

**math**

A jar of peanut butter which is 3 inches in diameter and 4 inches high sells for $0.60. At the same rate, what would be the price for a jar that is 6 inches in diameter and 6 inches high?
*December 14, 2013*

**math**

An appliance is on sale at a 30% discount. If the sale prices is $42,000, what was the original price of the appliance?
*December 14, 2013*

**math**

the formula for finding the surface area of a cube is A=6s with 2 at the corner where s is to the lengh of one side of the cube. what is the volume of the cube with side lengh of one half inches?
*December 4, 2013*

**Chemistry**

Determine the molar mass of a compound and its molecular formula if a solution of 1.00 g of the unknown is dissolved in 50 grams of cyclohexane. Cyclohexane freezes at 6.02 oC. The normal freezing point of cyclohexane is 6.50 oC and its kf value is 20.2 oC/m. The percent ...
*December 4, 2013*

**Social Studies**

This is for a Latin class, but as it has nothing to do with the language, it is more of a social studies question. For homework we had to complete a project on the Roman Empire. One part was to find all of the provinces, label them on a map, find the year they became a ...
*December 1, 2013*

**Physics - projectile**

5 seconds
*November 19, 2013*

**physics**

because of deformation, what can kinetic energy be converted into?
*November 18, 2013*

**social studies**

upon what did the success of southeast Asian empires frequently depend ?
*November 18, 2013*

**Please finish this:)**

This homework question was removed due to a copyright claim submitted by the National Network of Digital Schools Management Foundation (NNDS).
*November 17, 2013*

**Math:)**

I'm sorry, the equation that I forgot to put was 100w+10,000=220w+7,000. That's the one @Reiny I forgot to mention. Now how do you do PART 2? Thanks!
*November 17, 2013*

**Math:)**

Can anyone help?
*November 17, 2013*

**Math:)**

This homework question was removed due to a copyright claim submitted by the National Network of Digital Schools Management Foundation (NNDS). Thank you!:)
*November 17, 2013*

**Algebra**

In the logarithmic expression . . . log(base 4) 8 , how does the base 4 become base 2? Here is how it is suppose to be worked out: log(base2)8 / log(base2)4 => log(base2)2^3 / log(base2)2^2 => 3/2
*November 16, 2013*

**Algebra**

How do you find a new salary if you know the amount of a cut/raise and the salary before the cut/raise?
*November 16, 2013*

**Algebra**

Okay, thank you!
*November 15, 2013*

**Algebra**

Can logarithms have negative answers?
*November 15, 2013*

**Math**

the ratio of males to females in a college class is 2:6. If there are 72 students in the class, how many are male?
*November 11, 2013*

**math**

San fran won 21 games and lost 26. what is their ratio of games won to games played?
*November 11, 2013*

**Science**

3. A. Sequence the same gene in both species to compare similarity. 4. C. Vestigal I just did the test myself :P hope this helps to anybody out there!!!
*November 10, 2013*

**Science**

3. A. Sequence the same gene in both species to compare similarity. 4. C. Vestigal
*November 10, 2013*

**Science**

I'm doing this lesson right now and I don't know it either, but I will type down the answer even if your done with it lol. But for other people who need help I guess :P
*November 10, 2013*

**history**

how did George washington successfully lead a new nation? how did john adams successfully lead a new nation? thank you!
*November 6, 2013*

**science help plzzz**

1. A 2. C 3. C 4. C 5. D
*October 29, 2013*

**history**

thank you!!!
*October 29, 2013*

**history**

how were slaves treated in the american south?
*October 29, 2013*

**sicence**

Which example describes a method of relative dating? A. examining historical records to determine when a volcano erupted B. using radioactive isotopes to calculate the age of a rock C. measuring the depth of tree bark D. using fossils to determine the oldest rock layer in a ...
*October 23, 2013*

**Can someone check these answer for me?**

1. A. 2. D 3. B 4. C 5. B
*October 17, 2013*

**Physics**

VERTICAL SPRING A spring of negligible mass, spring constant k = 89 N/m, and natural length l = 1.4 m is hanging vertically. This is shown in the left figure below where the spring is neither stretched nor compressed. In the central figure, a block of mass M = 2 kg is attached...
*October 16, 2013*

**Physics**

Two identical cars (m = 1350 kg) are traveling at the same speed of 28.1 m/s. They are moving in the directions shown in the drawing. What is the magnitude of the total momentum of the two cars?
*October 1, 2013*

**physics**

170dB
*September 18, 2013*

**elementary functions**

f(x)=x(squared)+x-3. compute the difference quotient: (f(x+h)-f(x))/h
*September 17, 2013*

**Physics**

How long does it take T-Rex to reach its food 200m away assuming that he starts from rest and accelerates at 4.00 m/s2?
*September 16, 2013*

**physics**

Sheena can row a boat at 3.13 mi/h in still water. She needs to cross a river that is 1.10 mi wide with a current flowing at 1.75 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. (a) What is her speed with ...
*September 8, 2013*

**math**

factor (m/4 + n/3)(3m/4 - 2n/3) Is this the answer? if not, what did I do wrong? 3m^2/16 + mn/12 - 2n^2/9
*July 5, 2013*

**math**

solve for c: 3/4(2c+3)+3/5(8c-2)=9c
*July 5, 2013*

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