Saturday

April 25, 2015

April 25, 2015

Total # Posts: 994

**Chemistry**

Write the equilibrium constant expression, K, for each of the following reactions. Where appropriate, designate the K as Ksp. 2H2(g) + O2(g)<-->2H2O(g) 2Hg(l) + Cl2(g) <-->Hg2Cl2(s)
*November 14, 2011*

**Trig**

I have these sum and product property problems and I just want to make sure my work is right. Write equations expressing 1. cos 37degrees cos99degrees as a sum Answer: sin136+(-62) 2. sin4+sin7 as a product Answer: 2sin5.5 sin-1.5 3. cos 8x - cos 2x as a product Answer -...
*November 13, 2011*

**trig**

I have these sum and product property problems and I just want to make sure my work is right. Write equations expressing 1. cos 37degrees cos99degrees as a sum Answer: sin136+(-62) 2. sin4+sin7 as a product Answer: 2sin5.5 sin-1.5 3. cos 8x - cos 2x as a product Answer -2sin5x...
*November 11, 2011*

**Algebra**

7.5+y<13
*November 9, 2011*

**Algebra**

7.5+y<13
*November 9, 2011*

**Mathematics**

If a piece of wood is 5 cm longer than a second piece, and 3/4 of the second piece is equal to 3/5 of the first, what is the length of the second piece? Explain your workings
*November 9, 2011*

**Chemistry**

Calculate the solubility of AgCl in the following solution: 100mL of .004 M CaCl2
*November 7, 2011*

**Chemistry**

(Qualitative Analysis) I know this is vague, but if i had a solution of unknown cations that appear light purple, what could be the possible list of cations in the solution? I thought Mn, Ag, Cu after doing my own tests, but i am uncertain. Just on a visual analysis though, ...
*November 7, 2011*

**Chem 152**

if x moles of PbCl2(s) dissolve in 1.00L of water, how many moles of Pb2+(aq) are produced? how many Cl- produced?
*November 3, 2011*

**Science **

Technology has been used for centuries to study the ocean. Trace the history of one piece of technology. What do you think is the most important technology to study the ocean? And why do you think so?
*November 3, 2011*

**Math**

How does knowing 26=30 - 4 help you find 7+26?
*November 2, 2011*

**English**

Is "sinecure" used correctly in this sentence: He studied hard throughout college to get a sinecure job.
*October 30, 2011*

**English**

Is "impinge" used correctly in this sentence: Studying Latin every day impinged her grades in both Latin and English.
*October 30, 2011*

**English**

thanks
*October 30, 2011*

**English**

Does this sentence use "Reverberate" correctly?: The sound of thunder kept reverberated in his head.
*October 30, 2011*

**English**

Is anarchy used correctly in this sentence? : As so as the teacher step out of the class room to copys some paper the class was in a state of anarchy.
*October 27, 2011*

**math**

500x93x35+9999999999x99999999=
*October 27, 2011*

**chemistry**

(Re-posting because no one was answering chemistry questions) if you have 100mL of 0.1M acetic acid (ka = 1.8x10(-5)what is the pH after 10mL NaOH is added? I came up with an answer of 2.895, but i'm not sure if its right.
*October 27, 2011*

**Chemistry**

if you have 100mL of 0.1M acetic acid (ka = 1.8x10(-5)what is the pH after 10mL NaOH is added? I came up with an answer of 2.895, but i'm not sure if its right.
*October 26, 2011*

**Chemistry**

Ok, moving on from my last question, you have 100mL of 0.10M acetic acid with ka = 1.8x10(-5) and add 50mL (0.10M) NaOH.
*October 25, 2011*

**Maths**

This is saying that Kelly's sister is 1/2 the height of 144cm. 144/2=72cm So her sister is 72cm. if you want to convert this to inches, one inch equals 2.54cm.
*October 25, 2011*

**Chemistry**

Calculate the pH of a 100mL solution of 0.10M acetic acid ka=1.8x10(-5) i calculated the pH to be 2.87 from the square root of (1.8x10(-5) * 0.1, the negative log gives me the pH. The next question wants you to calculate the pH with 50mL HCl added. I found the pH to be 2.78 by...
*October 25, 2011*

**nath**

1/10 plus 1/10 gives you 2/10 or 1/5
*October 25, 2011*

**statistics**

The first answer is still correct based on trend so i would go with that
*October 20, 2011*

**statistics**

though if you're going off of the mean (average) week 4 would get 55 customers oddly enough the median (middle number) is 55 as well. There is no mode (most common number) to calc. average, 30+55+80=165/3=55
*October 20, 2011*

**Chemistry**

so i had to calculate the pH of a 100ml solution of .10M acetic acid (ka=1.8x10(-5) I came out to 2.87. But then, they want the pH if 50ml HCL is added. So i thought...Ka = x2/.15M, therefore the square root of .15M x 1.8x10(-5) = .00164(concentration). So -log(.00164) = 2.78...
*October 20, 2011*

**earth**

circumference of a cirle = pi x diameter. pi = 3.1415926535 (or just use pi button on calculator) Diameter = 2 x radius radius = 6380 (+620) or 7000km now you have all the info you need, plug in the numbers
*October 20, 2011*

**Chemistry Help!!**

I believe the elements with 8 electrons should be the noble gasses. Argon, Krypton,...etc.
*October 20, 2011*

**Chemistry**

Consider a 0.80M solution of HCN. The Ka of HCN is 6.2x10-10. What are the major species in solution? Calculate the pH of this solution. ----------------------------------- Ok, so i took a break, came back, and finished the problem. I have an x value of 2.23x10-5. I took the ...
*October 18, 2011*

**Chemistry**

Consider a 0.80M solution of HCN. The Ka of HCN is 6.2x10-10. What are the major species in solution? Calculate the pH of this solution.
*October 18, 2011*

**Chemistry**

What happens to the hydroxide ion concentration in aqueous solutions when we increase the hydrogen ion concentration by adding an acid? Would it be good enough to answer by stating that the OH- ion concentration decreases, lowering the pH?
*October 18, 2011*

**Chemistry**

So if i want to write the conjugate base for NH3, NH3 <--> NH2 + H(+)
*October 17, 2011*

**Chemistry**

Doing some practice problems, these are a couple of my answers. Are these written correctly? Write the conjugate acid: a)HPO4(2-) Answer: HPO4(2-) + H(+) --> H2PO4(-) b)NO2(-) Answer: NO2(-)+ H(+) --> HNO2
*October 17, 2011*

**5th grade math**

17 in the 10th
*October 12, 2011*

**impact math**

explain how you could find a decimal equivalent to 9/20
*October 12, 2011*

**Chemistry**

Consider 2 separate solutions, one of a weak acid HA and one of HCL. Assume that you started with 10 molecules of each. Draw a picture of what each solution looks like at equilibrium. Ok to my very limited knowledge on this subject so far, a weak acid at equilibrium should ...
*October 11, 2011*

**Social studies**

Can you please list so reason why the Reformation of the 16th century was a religious movement?
*October 10, 2011*

**algebra**

The actual room has an area of 166ft2 and one of the sides, s, measures 13ft. Side s corresponds to side m of your model and m = 2ft. In order for your model to have the same proportions as the actual room, what is the required area of your model room?
*October 9, 2011*

**Technology**

Can you give three examples of bad print media advertisement? Can you give me the link for the bad advertisement?
*October 9, 2011*

**calculus**

express u(t)=Tant/1+Tant in F of G
*October 4, 2011*

**business**

A loan of face value $30,000,000 is issued in bonds each face value $300. The bonds will be repaid with a bonus of 20%. 1/5th of the total capital will be repaid each year, the first payment being at the end of the 10th year. Coupons on the outstanding bonds are 7% p.a. paid ...
*September 29, 2011*

**pls help solving 4th math**

1. Explain why you would use front end estimation. Gie an example of one time you might use it. 2. Explain in words how to add 234+467. Make sure to explain regrouping, if necessary. Thanks for your help!
*September 28, 2011*

**4th grade Math Help**

1. explain why you would use front end estimation. Give an example of one time you might use it? 2. Explain in words how to add 352 + 958. Make sure to explain regrouping, if necessary? Please help! Thank you in advance.
*September 28, 2011*

**4th grade social study**

Please HELP! what is the relative location of virginia? Thanks.
*September 25, 2011*

**Algebraic Physics**

Hi, I'm having trouble with a particular homework problem. A rifle has muzzle velocity 450 m/s. If you're 53.0 m from a target the same height as the rifle, at what angle above the horizontal should you aim in order to hit the target? All help would be appreciated
*September 21, 2011*

**Physics**

Hi, I'm having trouble with a particular homework problem. A rifle has muzzle velocity 450 m/s. If you're 53.0 m from a target the same height as the rifle, at what angle above the horizontal should you aim in order to hit the target? All help would be appreciated
*September 21, 2011*

**chemistry**

thank you
*September 19, 2011*

**chemistry**

A 1.00 mol sample of N2O4 (g) is placed in a 10.0 L vessel and allowed to reach equilibrium accourding to the equation N2O4(g) <----> 2NO2(g) K = .0004 Calculate the equilibrium concentrations of N2O4(g) and NO2(g)
*September 19, 2011*

**math**

making bracelets 3 strands 4 colors how many combinations are there
*September 19, 2011*

**Chemistry**

7500cm 60sec 60min 24hr ---- x ---- x ---- x ---- 1sec 1min 1hr 1day Multiply across and divide by the bottom.
*September 19, 2011*

**4th grade Math Help**

Samuel has 1,482 baseball cards in his collecion. Maria gave Samuel 126 cards. How many cards does he have now? Explain what computation method you used and why. Please Help! Thanks Kevin
*September 19, 2011*

**Calculus**

Use the definition of continuity and properties of limits to show that the function is continues at given a. f(x)=x^2+sqrt(7-x) a=4
*September 12, 2011*

**Maths**

If f(x)=2x-3 find yhe average gradient between x=-1 and x=-2
*September 8, 2011*

**geometry**

if home is located at (5, 8) and your destination is at (29, 40), what is the midpoint of your trip?
*September 7, 2011*

**math**

3.2.1=6
*September 1, 2011*

**Chemistry**

Ok, so in my gen chem 1 class, the teacher showed us that ethanol would not dissolve a sugar cube while water dissolves a sugar cube easily. No explanation was given, she just told us we would find out in gen chem 2. Here i am in gen chem 2, and the same thing is shown to us ...
*August 31, 2011*

**CHEMISTRY!**

Specifications for lactated Ringer's solution, which is used for intravenous (IV) injections, are as follows for each 100mL of solution: 285-315 mg NA+ 14.1 - 17.3 mg K+ 4.9 - 6.0 mg Ca2+ 368 - 408 mg Cl 231 - 261 mg lactate, C3H5O3 How would you make this solution if you ...
*August 30, 2011*

**math**

Area equals length times width. A square has equal length sides so the answer is a number times itself that comes out to 400. 20 x 20 = 400. The length of each side is 20cm.
*August 30, 2011*

**algebra**

write out a number line from negative ten to positive ten, then you can have a visual reference to go by. Here is the order: -5,-7/8,-5/6, 6, 8. (least to greatest) fyi... -7/8 = -0.875 -5/6 = -0.833
*August 30, 2011*

**physics**

the speed of light is 300,000,000 meters per second. 4x10 to the 8th is 400,000,000 meters. distance divided by the speed of light gives you the answer, 400 million divided by 300 million equals 1.33, therefor it would take 1.33 seconds for the signal to get to the moon.
*August 30, 2011*

**Chemistry**

Specifications for lactated Ringer's solution, which is used for intravenous (IV) injections, are as follows for each 100mL of solution: 285-315 mg NA+ 14.1 - 17.3 mg K+ 4.9 - 6.0 mg Ca2+ 368 - 408 mg Cl 231 - 261 mg lactate, C3H5O3 How would you make this solution if you ...
*August 30, 2011*

**physics**

Unless i'm missing something, you have everything set up already. The total volume is 206 cm3, so if the flow rate fills 15.5 cm3 per second, it would take 13.29 seconds to fill the container. 206/15.5.
*August 29, 2011*

**science**

so in other words, it took 1.5 hours to travel 150 km. Therefore, if you want velocity in km/hr it is 100 kilometers per hour.
*August 29, 2011*

**Calculating Averages?**

just throwing out a number because i'm bored: 55.8741 was what i got. I'm no chemist, but i wanted to take a shot at it and now i'm curious how close the real answer is to mine.
*August 29, 2011*

**Algebra 2**

A country's population in 1991 was 15 million. In 2001 it was 16 million. Estimate the population in 2005 using exponential growth formula. Round your answer to the nearest million.
*July 29, 2011*

**PHYSICS**

A 54.0-cm diameter disk rotates with a constant angular acceleration of 2.0 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. Find the ...
*July 13, 2011*

**Algebra II**

f(x)=1/(x+2)
*July 3, 2011*

**Algebra II**

Find x-intercepts y= x²-2 is it (-√2,0) (√2,0)?
*July 3, 2011*

**Algebra II**

solve using quadratic formula p²+5p-5=0
*July 3, 2011*

**spanish**

Su novio la mas increible?
*June 29, 2011*

**science**

What hypotheses could you test to help resolve the debate that famines are caused more by human actions (or inactions) than by environmental forces?
*June 25, 2011*

**math**

What's the force on a mans knees weighing 235 lbs falling from 8' landing on his feet on hard dirt be?
*June 17, 2011*

**precalc**

A is accumulated amount investing after p principal for t years at and interest rate of r compounded anually k is times per year. P=$1500, r= 7%, t=6 P=1500, r=7%,t=5,k=4 P=$1250, r=5.4%,t=6
*June 12, 2011*

**pre calculous**

use the properties of logarithms to write the expression as a sum or difference of logarithms or multiples of logarithms. show your work ln x^2/y^3 Assuming x,y AND z are positive use properties of logariths to write the expression as a single logarithm logx+log y 1/3logx 4 ...
*June 12, 2011*

**Chemistry**

What is the definition of Gay-Lussac's law?
*May 18, 2011*

**Chemistry**

What is the definition of Combined Gas Law? I can't find it in my book anywhere.
*May 18, 2011*

**lit**

is it c
*May 17, 2011*

**Claret Maths**

represent 555 in base 5
*May 15, 2011*

**English**

Identify the comma that separates the subject from the verb with a comma below All students who attend Madison High School, should do so without the feeling that they will be subject to harassment or threats based on their clothing. It is their right to feel safe and secure ...
*May 15, 2011*

**physics**

ah man. i've got this too. for anyone that can help, the fact that the electron moves at close to the speed of light and thus Einstein's theory of special relativity will effect any lengths (based on the reference point) has to be taken into account. i think. maybe not...
*May 1, 2011*

**chemistery **

how many grams of O2 will it take to Oxidize 88 grams of C3H8 to CO and H2O
*April 29, 2011*

**Law**

looking to ascertain what the liquid volume of 5 gallons of acetic anhydride is in pounds.
*April 25, 2011*

**JAVASCRIPT**

Start button won't work for a scolling marquee. Below is the javascript code. window.onload = defineMarquee; var timeID; var marqueeTxt = new Array; var marqueeOff = true; function defineMarquee() { var topValue = 0; var allElems = document.getElementsByTagName("*&...
*April 21, 2011*

**ap us history**

i wasnt asking for an answer, i was asking for a critique of the question i wrote for my project
*April 10, 2011*

**ap us history**

criticize my ap us history dbq question that i made for a project During the 1960s, the united states moved from indirect into direct involvement in the vietnam war in order to stop the spread of communism. In light of the following documents and your knowledge of the time ...
*April 10, 2011*

**Buisness Law**

What is the function of a negotiable instrument? Describe the essential elements of a negotiable instrument.
*April 7, 2011*

**math**

t=sin(2*t^3) get the t
*April 6, 2011*

**Managerial Accounting**

Determining and interpreting flexible budget variances Use the standard price and cost data supplied in problem 15-18. Assume that Holligan actually produced and sold 31,000 books. The actual sales price and costs incurred follow. Actual price and variable costs: Sales price $...
*April 5, 2011*

**chemistry**

Helps a bunch thank you.
*April 1, 2011*

**chemistry**

How do you find the moler mass of a compound like H2O?
*April 1, 2011*

**math**

What is the volume of a cylinder with radius 8km and height 7km?
*March 30, 2011*

**physics **

A 63-kg ice-skater glides with a speed of 10 m/s toward a 14-kg sled at rest on the ice. The ice-skater reaches the sled and holds on to it. The ice-skater and the sled then continue sliding in the same direction in which the ice-skater was originally skating. What is the ...
*March 30, 2011*

**math**

14 x 6 / 28
*March 25, 2011*

**IT/210**

I don't know how to upload the text book
*March 23, 2011*

**IT/210**

Assignment: Chapter 5 Programming Problems · Complete Programming Problems 1 and 2. · Provide the analysis, pseudocode and test cases using the template submitted in Week 6 only (no diagrams are required). Chapter 5 Programming Problem Maximum Points Analysis 20 ...
*March 23, 2011*

**Physics**

Two balls, each with a mass of 0.819 kg, exert a gravitational force of 8.76 × 10^−11 N on each other. How far apart are the balls? The value of the universal gravitational constant is 6.673 × 10−11 Nm2/kg2. Answer in units of m.
*March 16, 2011*

**science**

what is an independent variable
*March 6, 2011*

**Chemistry**

The oxidation state for solid iron is 0 True False
*March 5, 2011*

**Physics**

While watching ocean waves at the dock of the bay, Otis notices that 13 waves pass beneath him in 26 seconds. He also notices that the crests of successive waves exactly coincide with the posts that are 5 meters apart. What are the period, frequency, wavelength, and speed of ...
*February 28, 2011*