Sunday
February 7, 2016

# Posts by Kevin

Total # Posts: 1,088

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

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
October 9, 2011

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

College Math
how to do sets
October 2, 2011

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

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

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

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

Economis
How would you illustrate the impact of each of the following events on a production possibilities curve for factory goods and farm goods
July 10, 2011

Economis
Vf hhhh x bbr foto N hhhh xbx db f df
July 10, 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
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

Physics
A nichrome wire has a radius of 0.50 mm and a resistivity of 1.5 ´ 10‑6 W‑m. What is the resistance per unit length of this wire?
February 23, 2011

Chemistry
In general, the orders (exponents) in a rate law can turn out to be positive or negative rational numbers, so -1 is a possibility.
February 23, 2011

economics
Which of the following is given as a reason for nations NOT to engage in free trade? A) Free trade gives consumers access to goods they might not otherwise be able to consume B) Tariffs are a good source of revenue for a nation C) Trade is shown to promote peace among nations ...
February 18, 2011

Physics
Two objects attract each other gravitationally with a force of 2.3×10−10 when they are 0.21 apart. Their total mass is 4.50 . Find their individual masses.
February 14, 2011

statistics
I need to prove this σ(hat)^2(x,y) = (1/n) Σ (Xi - X (bar) ) Yi using σ(hat)^2(x,y)= (1/n) Σ (Xi - X(bar)) (Yi-Y(bar)) and X(bar)= (1/n) Σ Xi σ(hat)^2 (x,y) is the estimator of covariance
February 13, 2011

physics
A block of mass m is dropped from the fourth floor of an office building and hits the sidewalk below at speed v. From what floor should the mass be dropped to double that impact speed?
February 11, 2011

programming in c
write a program to compute in centimeters of a steel rod
February 4, 2011

physics
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 118-kg laser sensor that measures the thickness of the ice (see the drawing). The helicopter and the sensor both move only in the horizontal direction and have a horizontal acceleration of ...
February 4, 2011

math
816 357 492
February 1, 2011

Physics
A 2.0 kg ball and a 3.5 kg ball are connected by a 2.0 m long rigid, massless rod. The rod and balls are rotating clockwise about its center of gravity at 21 rpm . What torque will bring the balls to a halt in 6.0s?
January 31, 2011

economics
How would you illustrate the impact of each of the following events on a production possibilities curve for factory goods and farm goods? (a) the computer is invented (b) 1 million farm workers remain unemployed for six months (c) a drought
January 31, 2011

physics
If an impulse of 60 Ns is required to stop and object, list in your log three force and time combinations that can stop an object.
January 30, 2011

Chemistry
How much energy (in kilojoules) is released when 12.8 g of steam at 130.0 C is condensed to give liquid water at 73.5 C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K*Mol)for the liquid and 33.6 J/(K*Mol) for the vapor.
January 24, 2011

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