# Posts by KEVIN

Total # Posts: 1,295

**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.

**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.

**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...

**nath**

1/10 plus 1/10 gives you 2/10 or 1/5

**statistics**

The first answer is still correct based on trend so i would go with that

**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

**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...

**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

**Chemistry Help!!**

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

**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 ...

**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.

**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?

**Chemistry**

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

**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

**5th grade math**

17 in the 10th

**impact math**

explain how you could find a decimal equivalent to 9/20

**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 ...

**Social studies**

Can you please list so reason why the Reformation of the 16th century was a religious movement?

**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?

**Technology**

Can you give three examples of bad print media advertisement? Can you give me the link for the bad advertisement?

**calculus**

express u(t)=Tant/1+Tant in F of G

**College Math**

how to do sets

**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 ...

**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!

**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.

**4th grade social study**

Please HELP! what is the relative location of virginia? Thanks.

**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

**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

**chemistry**

thank you

**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)

**math**

making bracelets 3 strands 4 colors how many combinations are there

**Chemistry**

7500cm 60sec 60min 24hr ---- x ---- x ---- x ---- 1sec 1min 1hr 1day Multiply across and divide by the bottom.

**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

**Science**

Acnsrl spgei

**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

**Maths**

If f(x)=2x-3 find yhe average gradient between x=-1 and x=-2

**geometry**

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

**math**

3.2.1=6

**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 ...

**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 ...

**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.

**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

**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.

**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 ...

**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.

**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.

**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.

**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.

**Calculus**

20

**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 ...

**Economis**

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

**Economis**

Vf hhhh x bbr foto N hhhh xbx db f df

**Algebra II**

f(x)=1/(x+2)

**Algebra II**

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

**Algebra II**

solve using quadratic formula p²+5p-5=0

**spanish**

Su novio la mas increible?

**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?

**math**

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

**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

**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 ...

**Chemistry**

What is the definition of Gay-Lussac's law?

**Chemistry**

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

**lit**

is it c

**Claret Maths**

represent 555 in base 5

**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 ...

**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...

**chemistery**

how many grams of O2 will it take to Oxidize 88 grams of C3H8 to CO and H2O

**Law**

looking to ascertain what the liquid volume of 5 gallons of acetic anhydride is in pounds.

**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("*&...

**ap us history**

i wasn't asking for an answer, i was asking for a critique of the question i wrote for my project

**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 ...

**Buisness Law**

What is the function of a negotiable instrument? Describe the essential elements of a negotiable instrument.

**math**

t=sin(2*t^3) get the t

**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 $...

**chemistry**

Helps a bunch thank you.

**chemistry**

How do you find the moler mass of a compound like H2O?

**math**

What is the volume of a cylinder with radius 8km and height 7km?

**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 ...

**math**

14 x 6 / 28

**IT/210**

I don't know how to upload the text book

**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 ...

**Physics**

All the same.

**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.

**science**

what is an independent variable

**Chemistry**

The oxidation state for solid iron is 0 True False

**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 ...

**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?

**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.

**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 ...

**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.

**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

**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?

**programming in c**

write a program to compute in centimeters of a steel rod

**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 ...

**math**

816 357 492

**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?

**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

**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.

**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.

**Probation**

Write a 750- to 1,000-word paper in APA format in which you assess the effectiveness of probation. In your paper you must address the following: •Define probation as a sentence. •Explain the probation process. •Explain your findings within each researched item ...