Posts by Confused

Total # Posts: 338

chemistry
What about this question? Calculate the mass (g) of PbSO4 that will dissolve in 2000 mL of 0.0694 M K2SO4 solution. The equation represents the solubility process. PbSO4 (s) Pb2+ (aq) + SO42- (aq) Ksp = 1.7 x 10-8

chemistry
the standard state free energy of hydrolysis of acetyl phosphat is G= -42.3 kJ/mol. Calculate the free energy change for the acetyl phosphate hydrolysis in a solution of 2mM acetate, 2 mM phospate and 3 nM acetyl phospahte.

Chemistry
An enzymatic hydrolysis of fructose was allowed to proceed to equilibrium at 25 degrees C. The original concentration of fructose-1-p was .2 M, but when the system had reached equlibrium the concentration of fructose 1-p was only 6.52 * 10 -5 M. Calculate the equilibrium ...

physics
If there were no air drag, how fast would drops fall from a cloud 2.4 kilometer above the Earth's surface? answer in m/s.

physics
If there were no air drag, how fast would drops fall from a cloud 2.4 kilometer above the Earth's surface? Answer in m/s.

physics
I think it's the wrong answer because I plugged it in and it was still marked wrong.

physics
What is the acceleration of a vehicle that changes its velocity from 120 km/h to a dead stop in 7 s? Answer in km/h·s

Statistics
P(10 on 1st card and 3 on 2nd)

math
find the other endpoint (x,11) of a segment given the endpoint (5,-4) and a distance of 17.

math
find the domain & range of each relation & identify any relations that define functions y=3(x+1)^2-5

physics
Bertrand Russell wrote, "I think we must retain the belief that scientific knowledge is one of the glories of man. I will not maintain that knowledge can never do harm. I think such general propositions can almost always be refuted by well-chosen examples. What I will ...

physics
1. What is a typical drift speed of electrons that make up a current in a typical DC circuit? (zero, less than 1 cm/s, about 10 m/s, or the speed of light) 2. What is the typical drift speed in a typical AC circuit? (zero, less than 1 cm/s, about 10 m/s, or the speed of light)

physics
1. If the voltage impressed across a circuit is constant but the resistance increases by a factor of 15. By what factor does the current change? 2. If the resistance of a circuit remains constant while the voltage across the circuit decreases by a factor of 12, by what factor ...

physics
1. How much does it cost to operate a 75 W lamp continuously for 1 week if the power utility rate is 7/kWh?

physics
1. (a) How far below an initial straight-line path will a projectile fall in eight seconds? (b) Does your answer depend on the angle of launch or on the initial speed of the projectile? the answer is no. but defend it. 2. Why is it important that a satellite be above Earth'...

physics
1. What did Newton conclude about the force that pulls apples to the ground and the force that holds the moon in orbit? 2. What does the very small value of the gravitational constant G (in standard units) tell us about the strength of gravitational forces? 3. We can think of ...

physics
1. If our sun shrank in size to become a black hole, using the gravitational force equation, explain why the Earth's orbit would not be affected. 2. Strictly speaking, you weigh a tiny bit less when you are in the lobby of a massive skyscraper than you do at home. Why is ...

physics
1)A toy train is initially at rest on a track fastened to a bicycle wheel, which is free to rotate. How does the wheel respond when the train moves clockwise? When the train backs up? Does the angular momentum of the wheel-train system change during these maneuvers? How would ...

Finance
How long would it take to accumulate $2,000,000 at a rate of 5% with the starting amount of $1,150,

chemistry
What about this question? Calculate the mass (g) of PbSO4 that will dissolve in 2000 mL of 0.0694 M K2SO4 solution. The equation represents the solubility process. PbSO4 (s) Pb2+ (aq) + SO42- (aq) Ksp = 1.7 x 10-8

chemistry
i'm still lost can you show me step by step please

chemistry
a 10.0mL vinegar sample was completely neutralized by 22.5mL 0.2M NaOH solution. calculate molarity and % of acetic acid in vinegar. please help

chemistry
what does it mean when it says the percentage of the original N2O4 that is dissociated.

chemistry
Kc=5.85x10^-3 at 25 degrees C for the reaction N2O4(g)<-->2NO2(g) fifteen(15.0) grams of N2O4 is confined in a 5.00-L flask at 25 degrees C. Calculate(a) the number of moles of NO2 present at equilibrium and(b) the percentage of the original N2O4 that is dissociated.

help plz
c. progress....the other 3 are complete antonyms

math
In Quadratics Grade Ten:How do you find the coordinates of the vertex? What is the Optimum value mean? What are the zeros of the relation? How do you know if the parbola is Maximum or Minimum?

Physics
Hey drwls, can you go ahead and finish the rest of the equations, please? I'm having much difficulty with the final equation.

Chemistry
ok the answer i got now was 50 degrees celcius

Chemistry
i keep getting 32.3005 for T, if you have worked it out did you use 8.314472 for R, also is -126kj/mol -12600j/mol?

Chemistry
The aquation of tris(1, 10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)3^2+ + 3H3O + 3H2O==> (Fe(H2O)6^2+ + 3 phenH^+ If the activation energy is 126 kJ/mol and frequency factor is 8.62 x 1017 s-1, at what temperature is the rate ...

Chemistry
i don't understand where k1 k2 t1 t2 come from... :(

Physics
doesnt vq = - work ?...signs are important since work = -u, and u = vq

Math for teaching.
I need help finding examples of discrete models used in addition. Can you explain this to me or show me a cite that might help. Thanks

international business
Explain the relation between trade and world output. Describe the broad pattern of international trade. If the nations of the world were to suddenly cut off all trade with one another, what products might you no longer be able to obtain in your country? Choose one other ...

math
complete the table fraction decimal percent 95% .80 3/9 6/8 66 2/3%

New Prague
My son brought home this problem... Make a set of at least 12 numbers that have the following landmarks. minimum: 3 maximum: 9 median: 7 mode: 7 someone please help!

college algebra word problem
Here's the problem I was asked: You are visiting your parents on a farm. They have asked you to design a small rectangular-shaped vegetable garden along an existing wall in their backyard. They wish to surround it with a small fence to protect their plants from animals. ...

maths
im trying to rearrange the following equation for x but getting confused because of the brackets and squares. I understand the process of changing the subject but on more simple equations. Please can you help me. Here's the equation y = 3(x+5)^2

HCA/219
What are some of the challenges to using a managed care approach in mental health care? How does a managed care model of mental health care reduce health care spending?

Math
Sorry, Yes the correct equation is -t^2 + 12t + 54

Math
The Political Noise Problem. The amount of background noise is important to television news reporters. One station developed the formula showing the noise level in decibels (N) as it relates to the time after the speaker stops talking in seconds (t). Use the equation below to ...

Algebra
f(x)=-x^2(x+3)(x-2) What are the x and y intercepts? Thanks!

Algebra
thanks!

Algebra
Find the equation of the ellipse with vertices at (-1,3) and (5,3)and length of minor 4.

physics
Okay, I get it now. Thanks Bob

physics
Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 26.7 N, the weight of each magnet is 6.55 N, and the magnetic force on the lower magnet is 2...

math
A Ferris wheel 28.0m in diameter rotates once every 21.0s. What is the ratio of a person's apparent weight to her real weight at the top? What is the ratio of a person's apparent weight to her real weight at the bottom?

algebra
Graph the line containing the given pair of points and find the slope (1,0) , (-5, -3) -3-0/-5-1 + -3/4 so the slope would be M=-3/4 but how do you graph -3/4? Am I looking at this correctly.

algebra
I get it thank you But I still can't get 2004, and 2008 right could you help?

algebra
what I did was: because of the minus sign 8 becomes -8 34-49 is -15 -8-(34-49) is 7 multiply 5 and 7 so it = 35

6th grade Math
1/12

cultural diversity
Arab describes an ethinicty, like saying someone is hispanic or something. Muslim means that they follow the Islamic religion

Math
M divided by five How would i translate that

English
1- wear waterproof sun screen, cause it is bad for the ocean. 2-use firendly enviroment safe clean prodcts on boats. 3-Be careful of what prodcts you buy at home cause that all will eventaully go back into the ocean. 4-Do not buy coral, cause it is taken from the ocean 5-do ...

Math
iam just trying to show an example for an equation

Math
what does 6x+4= instead of adding you minus?

physics i got link
I saw this picture before I think you posted it or someone on here h t t p : / / w w w . l o w e l l p h y s i c s . o r g / b e t a / T e x t b o o k % 2 0 R e s o u r c e s / C h a p t e r % 2 0 1 1 . % 2 0 R o l l i n g , %2 0 T o r q u e , % 2 0 a n d % 2 0 A n g u l a r...

physics i got link
because if you used that angle then the force of gravity wouldn't be the hypotenuse which it clearly is in the equations fg x = fg sin theta 2 = fg sin 37 fg y = fg cos theta 1 = fg cos 37 I understand components and why you have to resolve into components and that they ...

confused
I guess I just don't get it I understand resolving into components I agree with this fg x = fg sin theta 2 = fg sin 37 fg y = fg cos theta 1 = fg cos 37 i see were that comes from my only concern is if you use the angle that the ramp makes with the surface it sits on as ...

bus
A person was caught with inappropriate use of internet. Can someone tell me if this is right or how to word this

Accounting
The following data represent total personnel expenses for the Palmdale Human Service Agency for past four fiscal years: 20X1 $5,250,000 20X2 $5,500,000 20X3 $6,000,000 20X4 $6,750,000 Forecast personnel expenses for fiscal year 20X5 using moving averages, weighted moving ...

Chemistry
KHP?

CRT205
I am not sure if I should have included 'One can say' in my conclusion. What do you think? If I don't include it then no it doesn't support the conclusion. Why do you think it wouldn't be considered weak?

CRT205
Do you find my answers after the piece of the article to be correct? Do you think my argument is, in fact, and argument? Clearly sheer numbers do not always impress us. It is unlikely, for example, that many Americans *Note: This essay borrows very heavily from “A ...

CRT205
Since it is the very nature of terrorism not only to cause immediate damage but also to strike fear in the hearts of the population under attack, one might say that the terrorists were extraordinarily successful, not just as a result of their own efforts but also in ...

CRT205
Other questions have been asked about the article "Contolling Irrational Fears After 9/11 and Identifying at least two arguments and answering the questions on the syllabus. -I have found two which I think can be used. Will you please let me know if these are proper ...

chemistry
yes i was meaning C. For some reason im still getting the wrong answer probably my math, im going to keep trying it...thanks for your help

chemistry
The final answer is suppose to be in C. So therefore, would I solve the problem in Kelvin then convert back to degrees?

chemistry
Benzene has a heat of vaporization of 30.72kj/mol and a normal boiling point of 80.1 C . At what temperature does benzene boil when the external pressure is 445 ? This is how I am solving this problem, but when I enter the answer it says im wrong. Can someone help with the ...

MATH CHECK
COS[ARCSIN (SIN 3PI/4)] =COS[ARCSIN (SQRT2/2)] =COS [PI/4] = SQRT2/2

Math
A function is a rule, which assigns one and only one range element to each and every domain element? I want to answer that this is true but the word "every" is questionable. am i reading too much into this?

Math Prob
ok for changing the base of a log from 10 to e is there a formula?

math
Thanks! how do u determine that they are both -7 though? Doesn't it have to equal 21? or doesn't that 21 matter?

math
What is The solution set of 2k^2=21k-49 ?

math
what are the modifications and x intercepts of the cubed root of (1-x)-1?

physics
You can't solve for t from that though can you? If you use quadratic equation its a negative sign under the root and you can't take the root of that. I'm confused:S

physics
A box moves down a conveyor belt the is angled at 15 degrees, at a rate of 6m/s. The box then enters a dump off that is 3m below the end of the belt, what is the horizontal distance between the dump off and the belt? I have no idea where to start with this...I know you have x ...

Physics
A box moves down a conveyor belt the is angled at 15 degrees, at a rate of 6m/s. The box then enters a dump off that is 3m below the end of the belt, what is the horizontal distance between the dump off and the belt? I have no idea where to start with this...I know you have x ...

Physics
nvm i got it

Physics
A car is going 20m/s when they see a traffic light 200m ahead turn red. The traffic light is known to stay red for 15s. The driver wants to reach the light as it turns green. It takes them 1s to press the breaks and the car slows down at a constant rate. What is the speed that...

chem.
How many electrons can an orbital hold? I know the answer is 2, but how do you get there? And how do you figure out how many 2p orbitals there are in an atom?

economics
what is supply and demand?

History
Can someone help me find some websites speaking about the social, political, and economic compositions of the Reganomics and how it affected our political climate?

History
Describe the social, economic, and political composition of the decade of corporate greed and how it affected the political climate of the 1980s. Keep in mind that Reagan's tax policies favored some people over others.

IB Algebra
can you help me with my questin though?

Biology (Psychology)
What could you infer/say if a person could distinguish the difference between regular and low fat foods? It's for my science fair project. Like, besdies saying that they have an extraordinary sense of taste... >.> And make it about the individual; not as a group of ...

Chem
Ascorbic acid, H2C6H6O6, is a diprotic acide with a K1= 7.9 E-5 and a K2=1.6E-12. In a .005 M aq solution of ascorbic acid which of the following species is present in the lowest concentration. 1. H2O 2. H3O 3. H2C6H6O6 4. HC6H6O6 5. C6H6O6

Chem
.1 M HCl + .1 M NaCl .1 M HF + .1 M NaF .1 M HBr + .1 M NaBr Which of the above would be considered buffers?

chemistry
Delta H is positive, the reaction is endothermic therefore not spontaneous.

Chemistry
If 2 moles of electrons are required to oxidize 1 mole of unknown, what is the molarity of the unknown solution?? is the molarity reduce to half??

Chemistry
I'm doing an Equivalent Weight and Normality experiment and I got very confused on the discussion questions.[ the unknown is titrated with the KMnO4] 1) In this experiment MnO4- is reduced to Mn2+ by the unknown. What is the equivalent weight of MnO4- for this experiment. ...

accounting
How do I figure out the portion of the company’s total assets that are being financed with debt?

Chemistry
Three samples of an unknown acid are titrated with 0.4901 M NaOH. The average equivalent weight of the acid using the data below is g/equiv ? the mass of unknown for trial 1 is 1.02, trial 2 is 0.522, trial 3 is 0.742 volume of NaOH in trial 1 is 27.72, trial 2 is 14.22, and ...

Chemistry
Three samples of an unknown acid are titrated with 0.4901 M NaOH. The average equivalent weight of the acid using the data below is g/equiv mass of unknown vol NaOH trial 1: 1.02 27.72 trial 2: .522 14.22 trial 3: .742 20.02

chemistry
Three samples of an unknown acid are titrated with 0.4901 M NaOH. The average equivalent weight of the acid using the data below is g/equiv 1 2 3 mass of unknown acid (g) 1.020 0.522 0.742 vol NaOH used (ml) 27.72 14.22 20.02

chemistry
If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration for the standardized base will be (low, high, or unaffected) A drop of NaOH is hanging from the buret tip before the titration of KHP. Once the student begins ...

Sports
When was the most recent work stoppage in major league baseball?

finance *repost*
According to the Value Line Investment Survey, the growth rate in dividends for JCPenney for the previous 10 years has been -10 percent. If investors feel this growth rate will continue, what is the required return for JCPenney stock? Does this number make sense? What are some...

accounting/finance
What does a constant debt-equity ratio mean?

alegra
IF Twenty-five percent of your budget will be used to rent business space and pay for utilities. How do you write an algebraic expression that indicates how much money will be spent on business space and utilities?

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