Tuesday

February 21, 2017
Total # Posts: 318

**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

*May 13, 2010*

**chemistry**

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

*April 26, 2010*

**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

*April 26, 2010*

**chemistry**

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

*April 14, 2010*

**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.

*April 14, 2010*

**help plz**

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

*April 14, 2010*

**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?

*March 26, 2010*

**Physics**

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

*March 4, 2010*

**Chemistry**

ok the answer i got now was 50 degrees celcius

*March 2, 2010*

**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?

*March 2, 2010*

**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 ...

*March 2, 2010*

**Chemistry**

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

*March 1, 2010*

**Physics**

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

*February 24, 2010*

**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

*February 15, 2010*

**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 ...

*January 16, 2010*

**math**

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

*December 15, 2009*

**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!

*December 15, 2009*

**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. ...

*December 2, 2009*

**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

*November 19, 2009*

**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?

*November 15, 2009*

**Math**

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

*November 3, 2009*

**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 ...

*November 3, 2009*

**Algebra**

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

*October 12, 2009*

**Algebra**

thanks!

*October 5, 2009*

**Algebra**

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

*October 5, 2009*

**physics**

Okay, I get it now. Thanks Bob

*October 5, 2009*

**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...

*October 5, 2009*

**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?

*October 2, 2009*

**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.

*September 12, 2009*

**algebra**

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

*September 12, 2009*

**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

*September 12, 2009*

**cultural diversity**

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

*August 27, 2009*

**Math**

M divided by five How would i translate that

*August 27, 2009*

**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 ...

*August 27, 2009*

**Math**

iam just trying to show an example for an equation

*August 24, 2009*

**Math**

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

*August 24, 2009*

**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...

*August 10, 2009*

**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 ...

*August 10, 2009*

**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 ...

*August 10, 2009*

**bus**

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

*June 18, 2009*

**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 ...

*May 21, 2009*

**Chemistry**

KHP?

*March 3, 2009*

**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?

*February 8, 2009*

**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 ...

*February 8, 2009*

**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 ...

*February 8, 2009*

**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 ...

*February 8, 2009*

**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

*January 24, 2009*

**chemistry**

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

*January 24, 2009*

**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 ...

*January 24, 2009*

**MATH CHECK**

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

*December 11, 2008*

**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?

*December 11, 2008*

**Math Prob**

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

*December 11, 2008*

**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?

*December 5, 2008*

**math**

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

*December 5, 2008*

**math**

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

*November 3, 2008*

**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

*October 28, 2008*

**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 ...

*October 28, 2008*

**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 ...

*October 28, 2008*

**Physics**

nvm i got it

*October 7, 2008*

**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...

*October 7, 2008*

**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?

*October 1, 2008*

**economics**

what is supply and demand?

*September 1, 2008*

**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?

*August 3, 2008*

**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.

*August 3, 2008*

**IB Algebra**

can you help me with my questin though?

*May 7, 2008*

**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 ...

*May 4, 2008*

**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

*April 22, 2008*

**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?

*April 22, 2008*

**chemistry**

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

*April 22, 2008*

**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??

*April 6, 2008*

**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. ...

*April 6, 2008*

**accounting**

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

*April 4, 2008*

**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 ...

*April 2, 2008*

**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

*April 2, 2008*

**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

*April 1, 2008*

**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 ...

*April 1, 2008*

**Sports**

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

*March 27, 2008*

**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...

*March 14, 2008*

**accounting/finance**

What does a constant debt-equity ratio mean?

*February 4, 2008*

**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?

*February 1, 2008*

**math**

If in a problem it states 1.8 million how do I write that out in number form? Is it just 1.8 multiplied by a million to get 18,00,000

*January 27, 2008*

**writing analysis paper**

I have an analysis paper due on a poem. I have a few ?'s. Is the plot the same as the setting of the poem? when doing an outline what do I put under the plot? The plot is number I, but what do I list as A. B. etc? Do I put the location, the time of day? Don't know what...

*October 21, 2007*

**English II**

Ok, I see now. Thank you!

*October 16, 2007*

**English II**

I understand why they are wrong, I just can't like figure out the rule.

*October 16, 2007*

**English II**

I see how it can be different from, but there are like 2 other sentences with different from

*October 16, 2007*

**English II**

Ok, I have the write answer which is C.. But why would it be right? The diff between C,D= semicolon

*October 16, 2007*

**English II**

Correction: B= than jumping instead of from jumping

*October 16, 2007*

**English II**

I need to determine a rule as to why the answer is C. A.) Jumping off of a balance beam is different from jumping off a trampoline; each jump requires a unique skill. B.) Jumping off a balance beam is different from jumping off a trampoline; each jump requires a unique skill. ...

*October 16, 2007*

**Advanced Math I**

How do you go about solving this problem? x(a/4+1)y(c+3/2) /(x2)by-c+1 I am so confused about this. I don't get it! Please help.

*September 8, 2007*

**Human Resource Management**

"Create a diagram in PowerPoint® or Word mapping job opportunities starting from, or advancing to, the position focused on in your final project." For the diagram, I chose the tree diagram template in PowerPoint. My position is "Web Design." I have been...

*August 15, 2007*

**Spanish**

Add a prepositional phrase to clarify either to whom an item(s) belongs. Cual es su problemas? (ella) Thank you for using the Jiskha Homework Help Forum. Don't be confused! A prepositional phrase is often used to clarify "su" because it could mean "hers, his...

*June 24, 2007*

**algebra**

A principal of $5000 was invested in a savings account for 4 years. If the interest earned for the period was $400, what was the interest rate? i know this is 1.5 % or at least I think it is but how do i write it out? Use the equation I=Prt, where I=interest earned, P=...

*May 30, 2007*

**math/algebra**

find the slope of any line perpendicular to the line through points (6,7) and (5,8). a)-1 b)1 c)0 d)undefined y2-y1/x2-x1 = slope So...(8-7)/5-6) = 1/-1 = -1 The slope perpendicular to that would be the negative reciprocal of -1, which is 1. Therefore, the slope is 1.

*May 26, 2007*

**math/algebra1a**

write the equation of the line which has y-intercept (0,5) and is perpendicular to the line with equation y=-3x +1 a) y=-3x + 5 b) y= 1/3x + 5 c) y= 3x + 5 d) y= -1/3x + 5 The slope of the 2nd equation is -3...because the equation of a line is y=mx+b, where "m" is ...

*May 26, 2007*

**math/algebra1a**

write the equation of the line with x-intercept (-7, 0) na d undefined slope. a) y= -7 b) x= -7 c) y= -7x d) x= 0 The answer is b. This is because an undefined slope is m/0. So, its just a vertical line. Since x=-7, that's the line.

*May 26, 2007*

**math/algebra1a**

Write the equation of the line passing through (-3, -5)and (3,0). (a)y= -6/5x - 5/2 (b)y= 5/6x - 5/2 (c)y= 5/6 x + 2/5 (d)y= -6/5x + 2/5 You have to get the slope of the line using equation y2-y1/x2-x1. [0-(-5)]/[3-(-3)] = 5/6 Now that you have the slope, you have to solve for...

*May 26, 2007*

**algebra**

Given g(x) = –2x – 1, find g(3a). G(3a)=-2(3a)-1 = -6a-1 = -5 is this right or do I just stop at -6a-1 Just stop at -6a-1 Matt Also, let me add this. If you have -6-1 (without the "a") that would be -7. Not -5. But -6a-1 is the correct answer for this ...

*May 25, 2007*

**algebra**

Given f(x) = 2x - 5, find f(-3a). okay were does the a come in here? do I just write -3a in place of x as i did before?

*May 24, 2007*

**algebra**

Given f(x) = 5x2 – 3x + 1, find f(–2). so would this be 5(-2*-2) -3(-2)+1 answer being 15 not correct (I assume looking at your substitution that the first term is 5x^2 or 5x²) f(x) = 5x^2 – 3x + 1 f(-2) = 5(-2)^2 - 3(-2) + 1 =5(4) + 6 + 1 =27

*May 24, 2007*

**algebra**

f(x)=2x+5, find f(3) would this be worked out liek this 2(3)+5=11 Your answer is correct but improve your mathematical form and write is this way: f(x)= 2x+5 f(3)= 2(3)+5 = 11

*May 24, 2007*