Tuesday

February 21, 2017
Total # Posts: 1,652

**Chemistry**

I have the molecular formula C4H4O4. and I know that there is 2 ionisable H ions but I don't know where to go from there.

*June 16, 2015*

**Chemistry**

Item 1 Maleic acid is a carbon-hydrogen-oxygen compound used in dyeing and finishing fabrics and as a preservative of oils and fats. •In a combustion analysis, a 1.054-g sample of maleic acid yields 1.599 g of CO2 and 0.327 g of H2O. •When 0.609 g of maleic acid is ...

*June 16, 2015*

**Chemistry**

What is the pH change of a 0.220M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.155M with no change in volume?

*June 16, 2015*

**Math**

I do not understand

*June 6, 2015*

**physics**

Two metallic spheres, each with a mass of 0.46 g are suspended as pendulums by light strings from a common point. They are given the same electric charge, and the two come to equilibrium when each string is at an angle of 5.2° with the vertical. If the string is 21.0 cm ...

*May 18, 2015*

**ART**

Thank you!

*May 7, 2015*

**ART**

HEllo i need help on mixing colors because at school i don't have enough of the needed colors. So plz tell me how to mix and get : Orange Green Yellow BROWN! (For the big tree im drawing) And purple thank you and answer ASAP plz!

*May 7, 2015*

**College Chemistry**

Thank you so much

*May 6, 2015*

**College Chemistry**

Calculate the unknown of Ag+ if the potential of the following concentration cell is 300 mV at 25.0 C. Ag|Ag+(unknown)||Ag+(0.100M)|Ag I think I have to use Nernst Equation of Ecell=E0-.0592/nlogQ And at 25C is at 298K so i don't have to change anything. I am not sure if i...

*May 6, 2015*

**Math**

Is 2^9 * 3^12 * 5^6 * 7^3 a perfect cube? How do you know by just looking at it?

*April 29, 2015*

**Social Studies**

How would the Philippine government respond to an insurgency? A. the government would try to work with their members. B. the government would want to support it. C. the government would ignore it. D. the government would fight it fiercely. D?

*April 21, 2015*

**Algebra**

kyle drops a ball from a height of 15 feet above the ground. The function h = -16 f2 +15 gives the height h of the ball (in feet) after t seconds. Graph the function to determine at about what time the ball hits the ground

*April 21, 2015*

**chemisty**

A cylinder with a moving piston expands from an initial volume of 0.350L against an external pressure of 2.70atm . The expansion does 251J of work on the surroundings. What is the final volume of the cylinder?

*April 20, 2015*

**MicroEconomics**

A firm currently uses 50,000 workers to produce 120,000 units of output per day. The daily wage per worker is $100, and the price of the firm's output is $48. The cost of other variable inputs is $400,000 per day. (Note: Assume that output is constant at the level of 120,...

*April 19, 2015*

**chemistry**

2 HI + Li2S2O4 ¨ H2S2O4 + 2 LiI this is what I got and it says I'm wrong? I don't understand why

*April 14, 2015*

**chemistry**

Write a molecular equation for the gas-evolution reaction that occurs when you mix aqueous hydrobromic acid and aqueous potassium sulfide.

*April 14, 2015*

**chemistry**

Write a balanced equation for the reaction between perchloric acid and lithium carbonate.

*April 14, 2015*

**linear algebra-urgent**

could you explain how you got 55/25

*April 8, 2015*

**linear algebra-urgent**

1)let w=[3;4] and u=[1;2] a) find the projection p of u onto w. I found this to be p=[1.32;1.76] b) find a scalar k for which the vector kp has a norm that is equal to one. k=? d)find a vector that is orthogonal to span{w} s=? how do I do this

*April 8, 2015*

**history**

Can you edit my editorial for grammar punctuation, spelling etc? Samantha Witkowski CHC 2D Mrs. Buyers April, 4, 2015 Aboriginal Opinion Editorial On going years of mistreatment to Aboriginals have been heavily weighed and debated amongst the Canadian government. This ...

*April 3, 2015*

**chemistry**

Hello! I am struggling a bit with this problem A gas sample occupies 51.6 L at a pressure of 0.841 atm and 39.6 ºC. What is the amount of gas (mol) in this sample?

*April 3, 2015*

**chemistry**

How many molecules (not moles) of NH3 are produced from 3.55×10−4g of H2?

*April 2, 2015*

**chemistry**

How many grams of sucrose (C12H22O11) are in 2.50L of 0.710M sucrose solution?

*April 1, 2015*

**Chemistry**

Write a balanced equation for the combustion of gaseous ethylene (C2H4), an important natural plant hormone, in which it combines with gaseous oxygen to form gaseous carbon dioxide and gaseous water

*March 31, 2015*

**algebra**

A gold ribbon is to be placed around the outside of each rectangle of the frame. Write a polynomial expression to represent the amount of ribbon needed.

*March 31, 2015*

**itzel**

i think she means simplify. If so, it would be 4/11

*March 30, 2015*

**calc**

Suppose the derivative of a function f is f '(x) = (x + 2)^4(x − 3)^7(x − 4)^6. On what interval is f increasing? (Enter your answer in interval notation.)

*March 30, 2015*

**Criminal Justice**

Is it c? Sorry these are hard

*March 22, 2015*

**Criminal Justice**

16. Conviction rates for indigent defendants and those with their own lawyers were about the same in Federal and State courts. About __________% of Federal defendants and __________% of the defendants in the most populous counties were found guilty regardless of the type of ...

*March 22, 2015*

**Criminal Justice**

I think it is A ? Would that be correct?

*March 22, 2015*

**Criminal Justice**

15. Which of the following is not an example of an ethical dilemma a defense attorney may face? A) the prosecutor's winning record. B) client perjury. C) defense receipt of physical evidence. D) a confession in confidence.

*March 22, 2015*

**Criminal Justice**

. In 1215 the __________ was signed. Its article 39 provided a basis for modern juries. A) European Charter B) Charter of Liberties C) Articles of Confederation D) Magna Carta

*March 22, 2015*

**Criminal Justice**

Thanks!

*March 22, 2015*

**Criminal Justice**

D ? Is this correct?

*March 22, 2015*

**Criminal Justice**

. The __________ who conquered England in 1066 used procedures that set the stage for modern juries. A) Romans B) Greeks C) Huns D) Normans

*March 22, 2015*

**Criminal Justice**

. The __________ was the first governing document in the United States. A) U.S. Constitution B) second Constitution of Congress C) Twelve Tables D) Articles of Confederation

*March 22, 2015*

**maths**

express 40% of right angle into radian measure. express two third of straight angle into radian. express sum of angles of a quadrilateral intoradian.

*March 17, 2015*

**language arts**

Why are you guys lying? You're making other people fail. The answer is A, not C. If you took the test and it's wrong then stop spreading the wrong answer along to everyone else. That's extremely happy immature.

*March 11, 2015*

**physics**

A system of 1216 particles, each of which is either an electron or a proton, has a net charge of -5.920×10-17 C. A)How many electrons are in this system (exactly)? B)What is the mass of this system (to three significant digits)?

*March 10, 2015*

**physics**

A charge q1 is inside a spherical surface (although not necessarily at the exact center of the sphere). A second charge q2 sits just outside the surface. Choose whether the following statements are true or false. T/F The total electric flux through the spherical surface ...

*March 6, 2015*

**Biology Ms sue**

1.which of the following is a renewable resource? (A.wind) B.fossil fuels C.minerals D.land 2.The goal of -----is to use cells and tissues to treat human illnesses or injuries. A.clone (B.therapeutic cloning) C.reproductive D.gene therapy

*March 4, 2015*

**Biology**

1.Which of the following is a renewable resource? A.wind B.fossil fuel C.minerals (D.land) 2.The goal of -------is to use cells and tissues to treat human illnesses or injuries. A.clone therapy B.therapeutic cloning (C.reproductive cloning ) D.gene therapy

*March 4, 2015*

**Writing Skills Part 4**

2.which of the following would most likely be an entry in a topic outline? A.Toys can be gender - neutral. *B.Toys children love C.Quality toys should require some imagination D.It's possible for toys to be both educational and entertaining. Thank you for your help Write a...

*March 2, 2015*

**Writing Skills Part 4**

1.When creating a writing plan,which of the following should come first? *A.Material that will capture the reader's interest B.The first section of the body of the essay C.A brief summary of the conclusion 2.Which two things must be accomplished by the introduction if the ...

*March 2, 2015*

**Writing Skills Part 3**

1.Under the Library of Congress system,where would you begin to research for books on the legal system of Greece? A.E B.k C.U [ D.G] 2. You've located three books on a topic you're researching for an essay.The first thing you should do in determining if any of these ...

*March 2, 2015*

**Writing Skills Part 3**

1.Under the Library of Congress system,where would you begin to search for books on the legal system of Greece? A.E B.k C.U [D.G] 2.If a source is reasonable,we know A.The information offered up-to-date,factual detailed,and precise. [B.We can trust and believe author.] C.the ...

*March 1, 2015*

**physics**

A radio station, broadcasting at 89.1 MHz on the FM dial, has two transmission towers d = 40.0 m away from each other, producing signals that are completely in phase. An avid fan of this station is listening to it on her portable radio while jogging directly toward one of the ...

*February 27, 2015*

**Math**

Find the volume of the solid that is obtained when the region bounded by the curves x=9-y^2, x=y^2+1 and y=0 is rotated about the line y=-2. (the upper shape above the x-axis)

*February 22, 2015*

**chemistry**

A student is performing an experiment to find the density of water. She obtains a 100ml beaker, which weighs 53.257 grams, and she fills it with 60 mL of water. The temperature of the water is 25.5 degrees celsius (room temperature). Again the student takes the weight of the ...

*February 16, 2015*

**physics**

Galileo's first telescope used a convex objective lens with a focal length f = 1.65 m and a concave eyepiece. When this telescope is focused on an infinitely distant object, and produces an infinitely distant image, its angular magnification is +3.11. What is the focal ...

*February 14, 2015*

**Science**

wheres the freakin answers alexis

*February 12, 2015*

**Chemistry**

The temperature of an object increases by 44.9 °C when it absorbs 3871 J of heat. Calculate the heat capacity of the object.

*February 3, 2015*

**Chemistry**

Your computer monitor has a width of 14.56 inches and a height of 10.92 inches. What is the area of the monitor display in square meters?

*February 2, 2015*

**Chemistry**

What is the mass, in grams, of a pure iron cube that has a volume of 4.30 cm3?

*February 2, 2015*

**math**

plese help

*January 19, 2015*

**math**

Every night when Samantha came home from work she put any change she had in her pockets into a jar. One day she wanted to know how much change she had in her jar. She noticed that she had two more nickels than twice the number of dimes, and eight fewer quarters than twice the ...

*January 19, 2015*

**Health**

help help

*January 13, 2015*

**Algebra2**

When using the Vertical motion model, where does the leading coefficient -16 come from? When will it not be -16 and how will you know? I'm just trying to understand the Model.

*January 3, 2015*

**Sixth Grade Math**

what happens to the value expression 20 + a as a increases

*December 14, 2014*

**calculous (Series)**

-2.02 - 2.11 - 2.2 - ... -4 Find the sum of the series

*December 12, 2014*

**Physics**

A ladder of mass M and length 6 m rests against a frictionless wall at an angle of 50 degrees to the horizontal. The coefficient of static friction between the ladder and the floor is 0.5. What is the maximum distance along the ladder a person of mass 11M can climb before the ...

*December 11, 2014*

**Math**

Find the critical points and the interval on which the given function is increasing or decreasing, and apply the First Derivative Test to each critical point f(x)= (7/4)x^4+(28/3)x^3+(-63/2)x^2-252x critical points in increasing order: c1=? min or max? c2=? min or max? c3=? ...

*December 10, 2014*

**Math (Word Problem into formula)**

A chemist is studying the properties of a bronze alloy (mixture) of copper and tin. She begins with 6 kg of an alloy that is one sixth tin. Keeping the amount of copper constant, she adds small amounts of tin to the alloy. Letting x be the total amount of tin added, define c(x...

*December 8, 2014*

**Chemistry**

To 1.0 ml of 1.5%NaCl, water is added to a final volume of 100ml. What is the molarity NaCl of this final solution? 1.5g/100ml I do not know where to go from here?

*November 30, 2014*

**math**

On May 22, 1960, a powerful earthquake took place in Chile. It had a magnitude of 9.5. How much energy did this earthquake release?

*November 20, 2014*

**Math**

If a hen lays 225 days a year, how many eggs can you eat in a day?

*November 19, 2014*

**Math Help!**

k=70

*November 19, 2014*

**chemistry**

10.0 mL of a Cu2+ solution of unknown concentration was placed in a 250 mL Erlenmeyer flask. An excess of KI solution was added. Indicator was added and the solution was diluted with H2O to a total volume of 75 mL. The solution was titrated with 0.20 M Na2S2O3. The equivalence...

*November 19, 2014*

**Or**

or would it be 9(sin theta - 5/9) i believe i did the work wrong

*November 14, 2014*

**Follow up work.. I am unsure if it is the right**

I know i would bring the 5 over to the other side so it would look like x = 9sin theta - 5 would I distribute the 9 to the sin and the -5? So x = 9(sin theta - 45) just confused on how to get to cos 2 theta

*November 14, 2014*

**Math**

A bag contains 6 red balls, 5 green balls and 4 yellow balls. How many balls must you take out to be sure that you have at least 3 balls of each color? I literally have no idea for this question. Should I just put 15(take all of them out to be sure?) or is there some kind on ...

*November 13, 2014*

**UNION UNIVERSITY**

Find the Z score for the weights of Middle school boys which are approximately Normal, mean = 130 lbs, Standard Deviation = 7, if Johnny weighs 148 lbs, What's his Z score?

*November 12, 2014*

**Physics**

NASA, when it sends probes to other planets, uses what is known as a gravitational slingshot. This is when a probe uses the gravitational potential energy a planet to gain kinetic energy. Even though the probe and the planet are not physically colliding, one can treat this ...

*November 11, 2014*

**Physics**

A block of mass 0.45 kg can slide over a frictionless horizontal surface. It is attached to a spring whose stiffness constant is k = 18 N/m. The block is pulled 38 cm and let go. a)What is its maximum speed? b)What is its speed when the extension is 30 cm? c)At what position ...

*November 5, 2014*

**grammar**

them

*October 22, 2014*

**global studies**

Like many absolute monarchs before him, Peter the Great strengthened his own power by limiting the power of Russian

*October 5, 2014*

**Chemistry 104**

A student has 10.0mL of phosphate solution that contains 1.0M PO4{3-}.The Student reacts this with excess ammonium & magnesium under basic conditions to produce 2.2034g of struvite. Calculate the % yield.

*October 2, 2014*

**Math**

Each letter in this addition problem stands for a different digit, but every letter stands for the same digit everywhere it appears. For example, all of the C's stand for the same digit. Reconstruct the problem to find the value of SCENE. CUTS +CUTS ------ SCENE

*October 1, 2014*

**Math**

Logan saves $5.50 in dimes and quarters over a week. He has 20 more dimes than quarters. Find the number of dimes and quarters he saves. How do I solve the problem algebraically?

*September 23, 2014*

**chemistry**

Can someone please explain to me how to find the energy released? Given the overall reaction that takes place when hydrogen is burned in a young star, how much energy in MeV is released per He nucleus formed? masses: 1-H atom= 1.007amu 4-He atom= 4.002 amu positron = 5.485e-4 ...

*September 19, 2014*

**Pre-Calculus**

it says webpage not found

*September 19, 2014*

**Chemistry**

244pm

*September 14, 2014*

**Algebra 3-4**

The first stage of a rocket burns 28 s longer than the second stage. If the total burn time for both stages is 152 s, how long does each stage burn? Describe how you found your answer. I was originally thinking to divide 152 by 2 then add 28, but I realized that wouldn't ...

*September 12, 2014*

**Physics**

An object has a initial velocity of 10 m/s in the positive x direction. Under a constant acceleration it stops after undergoing a displacement of 148.3 m in the positive x direction. Because it is still under the same acceleration it then travels back in the negative in the x ...

*September 3, 2014*

**Math, Calculus**

0.00695

*September 2, 2014*

**Math**

Why does Zara have a good driving record?

*September 1, 2014*

**math**

Yooyoullylyl

*August 20, 2014*

**algebra**

is 3.27 a rational or irrational number

*August 6, 2014*

**college statistics**

The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees (n = 474) and their starting salaries. The study collected current and beginning salary data for each of the 474 employees and the researcher conducted a ...

*July 20, 2014*

**science**

A runner whose mass is 49 kg accelerates from a stop to a speed of 6 m/s in 3 seconds. (A good sprinter can run 100 meters in about 10 seconds, with an average speed of 10 m/s.) (a) What is the average horizontal component of the force that the ground exerts on the runner'...

*July 17, 2014*

**physics**

An object with mass 110 kg moved in outer space. When it was at location < 11, -35, -7 > its speed was 17.5 m/s. A single constant force < 230, 420, -230 > N acted on the object while the object moved to location < 16, -41, -13 > m. What is the speed of the ...

*July 5, 2014*

**math**

Mike's number is 2000 more than Jerry's which is 400 less than Barry's. Larry's number is 1500 more than Sam's, which is 443. Sam's number is 60 less than Barry's. WHat is each boy's number?

*June 17, 2014*

**math**

Mike's number is 2000 more than Jerry's which is 400 less than Barry's. Larry's number is 1500 more than Sam's, which is 443. Sam's number is 60 less than Barry's.

*June 17, 2014*

**algebra**

A pet boarding facility wants to build two adjacent pens of equal size. They are using the length of the dog kennel as one side of the two pens. They have 324 feet of fencing to build the pens. What width should he make the pens to maximize the total area of the pens?

*May 31, 2014*

**Math**

When rolling a standard number cube twice, what is the probability of rolling two even numbers? I'm pretty sure the answer is 1/4, but the solutions says that this is wrong.

*May 24, 2014*

**statistics**

A pop-music record firm wants the distribution of lengths of cuts on its record to have an average of 129 seconds and a standard deviation of 10 seconds so that disc jockeys will have plenty of time for commercials within each 5-minute period. The population times for cuts is ...

*May 17, 2014*

**Statistics**

A brewery's filling machine is adjusted to fill bottles with a mean of 33.8 oz. of ale and a variance of 0.005. Periodically, a bottle is checked and the amount of ale noted. (b) Let's say you buy 93 bottles of this ale for a party. How many bottles would you expect to...

*May 12, 2014*

**Calculus**

1. If y′= x(1+ y) and y > -1 , then y= A) y=sinx B) y=3x^2+C << C) y=Ce^1/2x^2-1 D) y=1/2e^x^2+C E) y=Csq(x+3) 2. If dy/dx = x cos x^2 and y = −3 when x = 0, when x = π, y = ___. A) -3.215 B) √2 << C) 1.647 D) 6 E) 3π 3. Suppose an ...

*May 9, 2014*

**Calculus**

1) yy'-e^x= 0, and y=4 when x=0 means that: A)y=x-lnx^2+4 B)y^2=4x^2+3 C)y=-2x+1/2x^3 D)y^2=2e^x+14 E)1/2ln|x^2+4|+6 2) The rate of change of P with respect to t is directly proportional to (10-t) and inversely proportional to the cube root of P. The differential equation ...

*May 9, 2014*

**Calculus**

Which of the following is a separable, first-order differential equation? A) dy/dx= x+y/2x B) dy/dx=x+y/x-y C) dy/dx=sinx << D) dy/dx=xy/x+y E) dy/dx= 2lnxy 2) The differential equation dy/dx=y/x^2 has a solution given by: A) y=C sqrt(x^2+4) B)y=C e^-1/x C)-1/2ex^2+C D) ...

*May 8, 2014*