# Posts by megan

Total # Posts: 1,180

**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.

**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?

**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...

**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.

**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?

**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?

**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?

**math models**

33.4

**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 -- ...

**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 ...

**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 ...

**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...

**Science - Please Check My Answers**

on number one i got D i believe D is correct because i know C is wrong and everyone i have talked to has said D for the first one

**physics**

d1/t1

**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?

**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

**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 ?

**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?

**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...

**economics**

Looking for examples on the four production factors within a service environment

**Social Studies**

Thanks @PsyDAG your right

**social studies**

Thanks @me and @:) you guys are right.!!!!!

**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, ...

**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 ...

**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

**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 ...

**English**

Correct answer is B. conclude 10 minutes earlier than scheduled.

**Science - Check my answers**

Thanks AroaEdits!!!!

**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...

**chemistry**

Hg2Cl2 = Hg + HgCl2 Please help me write the two half equations for this.

**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

**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=?

**Math**

Thank you

**SCIENCE HELP ASAP! :)**

Here is the answer trust me these are right i just tok the quiz C B C A C A B A B A Please trust these answers they are 100% right!!!

**algebra**

Find a slope of a snowboarding beginner hill that decreases 24 feet vertically for every 30 foot horizontal increase

**Science**

1. A 2. C 3. A 4. C 5. D

**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

**science help plzzz**

Thanks ms.sue

**Science**

D B B B 100% TRUST ME

**World History**

What was the anaconda Plan

**science help plzzz**

THE ANSWERS ARE B D C C A just like LOVE said

**Writing**

Ok Hack. Thank you. Ill try it and c how it works out. :)

**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.

**Science**

thanks crystal

**Writing?!**

thanks. you guys helped me a lot. i got tons of ideas i hope the story will be fine.

**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!

**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! :)

**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...

**please help me!! with this science!!!!!**

1. C 2. B 3. B 4. 1 & 2 5. C 6. A 7. D 8. D 9. B 10. C 11. D 12. A 13. D 14. C 15. B 16. A 17. C 18. False

**please help me!! with this science!!!!!**

HERE ARE THE CORECT ANSWERS TRUST ME PLZZZZ1. C 2. B 3. B 4. 1 & 2 5. C 6. A 7. D 8. D 9. B 10. C 11. D 12. A 13. D 14. C 15. B 16. A 17. C 18. False

**please help me!! with this science!!!!!**

I got 100% plz trust me 1.) B 2.) C 3.) C 4.) C 5.) B

**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.

**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?

**math**

I do not get how you got 3times as much when they aren't fully simplified.

**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?

**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?

**Chemistry**

Ni(OH)2

**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?

**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 ...

**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 ...

**Physics - projectile**

5 seconds

**physics**

because of deformation, what can kinetic energy be converted into?

**social studies**

upon what did the success of southeast Asian empires frequently depend ?

**Please finish this:)**

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

**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!

**Math:)**

Can anyone help?

**Math:)**

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

**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

**Algebra**

How do you find a new salary if you know the amount of a cut/raise and the salary before the cut/raise?

**Algebra**

Okay, thank you!

**Algebra**

Can logarithms have negative answers?

**Math**

18?

**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?

**math**

San fran won 21 games and lost 26. what is their ratio of games won to games played?

**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!!!

**Science**

3. A. Sequence the same gene in both species to compare similarity. 4. C. Vestigal

**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

**history**

how did George washington successfully lead a new nation? how did john adams successfully lead a new nation? thank you!

**science help plzzz**

1. A 2. C 3. C 4. C 5. D

**history**

thank you!!!

**history**

how were slaves treated in the american south?

**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 ...

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

1. A. 2. D 3. B 4. C 5. B

**Chemistry**

30

**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...

**Social Studies**

THANKS

**science**

9.8m/ss

**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?

**physics**

170dB

**elementary functions**

f(x)=x(squared)+x-3. compute the difference quotient: (f(x+h)-f(x))/h

**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?

**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 ...

**Chemistry- Please Help!!**

K=[fe3+][OH-]^3

**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

**math**

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

**math**

a ship leaves a port at 6 am traveling due east at 12mph. another ship leaves a port 11 am traveling due north at 15 mph. how far apart are they at 11pm to the nearest tenth mile?

**math**

When I went kite flying the other day, I let out an entire roll of string (400 feet). If when the string pulled tight formed a 40 degree angle with the ground, about how high was the kite?

**math**

Two metal alloys, containing 26% copper and 54% copper are to be mixed together to get 210 oz that is 30% copper. How much of each should be used?