Thursday

August 25, 2016
Total # Posts: 977

**chemistry**

If you wanted to standardize an approximately 0.1 M solution of hydrochloric acid by titrating 10.00 mL (delivered from a pipet)with approximately 30mL of sodium hydroxide solution (delivered from a buret), what should be the approximate concentration of the sodium hydroxide ...
*April 22, 2010*

**chemistry**

I am sorry it is in grams.
*April 19, 2010*

**chemistry**

At 1285 degree C the equilibrium constant for the reactin Br2(g) <> 2Br(g) is Keq= 1.04 * 10^-3. A 0.200 L vessel containing an equilibrium mixture of the gases has 0.245 Br2(g) in it. What is the mass of Br(g) in the vessel? Please help, Thanks!!
*April 19, 2010*

**engineering**

I mean in Scientific notation?
*April 17, 2010*

**engineering**

What is the answer to part two??
*April 17, 2010*

**geometry**

find the area of the trapezoid whose diagonals are 30 each and height of 18? I spent 2 hrs and I can't figure it out Pls. help 408-887-2612
*April 16, 2010*

**Pre Calculus**

Establish the identity (cosx/2-sinx/2)^2=1-sin x
*April 15, 2010*

**Pre Calculus**

Establish the identity tanx/2=cscx-cotx
*April 15, 2010*

**calculus II**

(4/9)^(n-.5)
*April 11, 2010*

**math 3**

If Lynn can type a page in p minutes, what piece of the page can she do in 5 minutes?
*April 10, 2010*

**chemistry**

Qcal= CSP * (delta)T
*April 6, 2010*

**math**

A painter needs to cover a triangular region 62 meters by 66 meters by 71 meters. A can of paint covers 70 square meters. How many cans will be needed?
*March 31, 2010*

**chemistry**

What is the equation of the preparation of K3[Al(C2O4)3].3H2O using Al2(SO4)3?
*March 24, 2010*

**Statistics**

T-Test The article “Does Smoking Cessation Lead to Weight Gain?” described an experiment in which 322 subjects, selected at random from those show successfully participated in a program to quit smoking were weighed at the beginning of the program and again one year ...
*March 18, 2010*

**business math**

It's a lot of words, but short questions. I got most of it, but I'm confused on a and c. Help would be greatly appreciated: Theater Seven wants to increase its popularity. They want to determine the best number of newspaper (N), Radio (R), and Television (T) ads to ...
*March 14, 2010*

**chem**

228mL 452mL
*March 14, 2010*

**Chem**

How do I know what N is??
*March 9, 2010*

**Chem**

A sample of gas of mass 2.929 g occupies a volume of 426 mL at 0degree Cel and 1.00 atm pressure. What is the molecular weight of the gas? Thanks!
*March 9, 2010*

**Chem**

Is there an easy way to re-write PV=nRT so that it equates density with molar mass?
*March 8, 2010*

**Calculus**

The manager of a 100 unit apartment complex knows from experience that all units will be occupied if the rent is $500 per month. A market survey suggests that, on average, one additional unit will remain vacant for each $10 increase in rent. What rent should the manager charge...
*March 2, 2010*

**4th grade math**

gfdxtttb avb c6
*February 17, 2010*

**English**

I am asked to describe the "syntax" of a book I am reading. I have looked up several definitions of the word and still do not understand what it means.
*January 24, 2010*

**english**

- Computers - English - Foreign Languages - Health - Home Economics - Math - Music - Physical Education - Science - Social Studies GRADE LEVELS - Preschool - Kindergarten - Elementary School - 1st Grade - 2nd Grade - 3rd Grade - 4th Grade - 5th Grade - 6th Grade - 7th Grade - ...
*January 8, 2010*

**AP Biology**

biology
*January 8, 2010*

**us history**

Get a good knights sleep and then start
*January 8, 2010*

**spanish**

what does these sentence say 1. Rufo/llegar temprano a la clase de matematicas 2. Nico y Gilda/ usar la computadora en la clase de historia
*January 7, 2010*

**biology**

How are sperm and egg cells formed? Describe in general terms what happens during meiosis.
*January 7, 2010*

**MATH ANALYSIS**

its simple, all you do is type it into the calculator
*January 7, 2010*

**9th grade biology**

peeing liquid diraheea contracting chlorea
*January 7, 2010*

** Algebra 1A**

Translate Two dollars plus four cents times the number of minutes in part into a symbolic rule. Use c to represent the total monthly cost and n to represent the total number of long-distance minutes for the month.
*December 2, 2009*

**MAT 116 – Algebra 1A**

A long-distance telephone plan costs $2.00 a month, plus 4 cents per minutes, or part thereof, for any long-distance call made during the month. Write a verbal rule to determine the total monthly cost for your long-distance calls for the month.
*December 2, 2009*

**Math**

12 and 60
*November 30, 2009*

**Trigonometry**

What's the easiest way to remember how to draw the graphs for the common trigonometric functions, like sin cos and tan?
*November 18, 2009*

**math**

Think of it like a right triangle. The distance horizontally is 4 (from -1 to 3). The distance vertically is 6 (from -1 to -7). You know the formula a^2 + b^2 = c^2 with c being the hypotenuse. Therefore, 4^2 + 6^2 = c^2 and c is the distance between the points. 16 + 36 = c^2 ...
*November 18, 2009*

**chemistry**

how to get benzoic acid from a mixture of benzoic acid and salt?
*November 14, 2009*

**Calculus**

A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed of 1.5 m/s, how fast is the length of his shadow on the building decreasing when he is 4 m from the building?
*November 8, 2009*

**Calc**

A plane flying horizontally at an altitude of 1 mi and a speed of 510 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 6 mi away from the station. (Round to the nearest whole number.)
*November 8, 2009*

**Chemistry**

a 22.5g sample of (NH4)2CO3 (ammonium carbonate) contains_____ moles of ammonium ions. A. o.468 b. 0.288 C. 0.234 d. 2.14 e. 3.47
*November 1, 2009*

**finance **

John Keene recently invested $3,500 in a project that is promising to return 10.75 percent per year. The cash flows are expected to be as follows: End of Cash Year Flow 1 $750 2 800 3 ??? 4 950 Note that the 3rd year cash flow is unknown. Assuming the present value of this ...
*October 23, 2009*

**physics**

On a cold winter morning, a child sits on a sled resting on smooth ice. When the 9.10 kg sled is pulled with a horizontal force of 36.0 N, it begins to move with an acceleration of 2.10 m/s^2. The 25.0 kg child accelerates too, but with a smaller acceleration than that of the ...
*October 11, 2009*

**Algebra**

When you're breaking down the square root in the quadratic formula into several parts- say it was the originally the square root of 80 so you break it down to square root of 4 and square root of 20-would the results be added or multiplyed? Because I know when you further ...
*October 5, 2009*

**Algebra**

A winch is used to tow a boat to a dock. The rope is attached to the boat at a point 15 feet below the level of the winch. Find the distance from the boat to the dock when there is 75 feet of rope out. I got 15^2+75^2=X^2. I put a square root around each side so I got 15+75=X^...
*October 5, 2009*

**Algebra**

I'm trying to solve this Pythagorean Theorom problem. x^2+(2x^2)=32^2 which becomes 5x^2=1024 I don't get how the x^2 and the 2x^2 combine to get 5x^2. I think it should be 3x^2. Can you explain? Thanks!
*October 5, 2009*

**8th grade**

Direct Variation: when you have a job that pays an hourly wage, the amount you earn varies directly with the number of hours you work. Suppose you earn $7.10/ hour working at the library.
*October 3, 2009*

**Regression**

anyone?
*September 30, 2009*

**Regression**

HELP Please
*September 30, 2009*

**Regression**

1)Price of COke 2)Price of Pizza 3)Price of Beef 4)Quantity of Beef 5)Income 1) List and explain each of the components of you regression model, both the dependent and independent variables 2) list each of the indepedent variables, and hypothesize the sign of coefficients and ...
*September 30, 2009*

**Regression Analysis**

-Quantity of Beef -Price of Beef -Price of Pizza -Price of Coke -Income What are the independent and dependent variables with regards to independent hypothesize the sign
*September 30, 2009*

**Regression Analysis**

1)Quantity of Beef 2)Price of Beef 3)Price of Pizza 4)Price of Coke 5)Income 1- list and explain each of the components of your regression model, both the dependent variable and the independent variables 2-list each of the independent variables, hypothesize the sign of the ...
*September 30, 2009*

**calculus**

is square root x^4-4-y=0 and x^2+y^2=4 a function
*September 29, 2009*

**senior project**

How can I do a good senior project about obesity in america? what are some things i can do? how can i do community service about it? what are some other ways i can make it unique and different from others? need more ideas please
*September 27, 2009*

**Math**

Hi, I wanted to know how can I donwload "B2K - Badaboom (featuring Fabolous)/Take It To The Floor" file from your site. Where do I click? Thanks.
*September 25, 2009*

**chemistry.**

What is the empirical formula of a hydrocarbon that contains 89,94% by mass?
*September 25, 2009*

**chemistry.**

What is the empirical formula of a hydrocarbon that contains 89,94 by mass?
*September 25, 2009*

**spanish**

how to say todays date in spanish
*September 23, 2009*

**world history**

define... 1- assets 2- intervening 3- haciendas 4- nationalization 5- revolution short answer 1- what political and economic factors helped cause the Mexican Revolution ? 2- Explain how the constitution of 1917 tried to resolve some of the problems that started the revolution...
*September 14, 2009*

**Finance**

You belong to an unusual pension plan because your retirement payments will continue forever (and will go to your descendants after you die). If you will receive $30,000 per year at the end of each year starting 25 years from now, what is the present value of your retirement ...
*September 10, 2009*

**principles of design**

i dont get the principles of design. what are pattern, rhythm, unity, movement, emphasis, contrast, and balence. please help.
*September 9, 2009*

**art**

thank you
*September 9, 2009*

**art**

i don't get the principles of design.i mean, what does pattern, rhythem, unity, movement, emphasis, and contrast REALLY mean? i am a seventh grader seeking answers and EXAMPLES.
*September 9, 2009*

**Science**

Is a Trypanosoma Brucei a Flagellate, Ciliate, Amoeba, or Sprozoan?
*July 11, 2009*

**trig**

Solve for X. Leave answers in logarithmic forms. 3^(2-x) = 2^x Thanks.
*June 16, 2009*

**chemistry help**

NAME A UNIT OF CONCENTRATION COMMONLY USED TO EXPRESS SMALL CONCENTRARTIONS?
*May 18, 2009*

**chemistry**

yes can you just guide me through this one and it will be the last
*May 8, 2009*

**chemistry**

A 900.0 g sample of sea water is found to contain 6.7 x 10-3 g Zn. Express this concentration in parts per million?
*May 8, 2009*

**chemistry**

A sample of 300.0g of drinking wtare is found to cntain 38 mg Pb. What is this concentration in parts per million?
*May 8, 2009*

**pre calc asap**

ok i see now
*May 7, 2009*

**pre calc asap**

what do you mean?
*May 7, 2009*

**pre calc asap**

what is the domain and range of f(x) =x^2
*May 7, 2009*

**chemistry?**

why might we use it??
*May 4, 2009*

**chemistry**

this is something like the answer should be
*May 4, 2009*

**chemistry**

What is a serial dilution and why might you want to use it?
*May 4, 2009*

**algebra need help**

yes thats what I mean
*April 30, 2009*

**algebra need help**

Add. 4m^2yp + 6/m^y
*April 30, 2009*

**algebra**

Add. 4m^2yp + 6/m^y
*April 30, 2009*

**algebra**

Add. 4m^2yp + 6/m^y
*April 30, 2009*

**U.S Constitution**

it sets forth laws, justice, peace and people in the future. The people themseleves like you or I are responsible for it. can you tell me more??
*April 27, 2009*

**U.S Constitution**

Identify each of the responsibilities the Preamble set forth. Who is responsible for them?
*April 27, 2009*

**chemistry help**

Why is hydrogen peroxide very soluble in water?
*April 21, 2009*

**chemistry need help**

Contrast ionic and molecular substances in terms of the types of attractive forces that govern their behavior.
*April 21, 2009*

**Chemistry**

What would the two half reactions be for 2Na+1MgBr2 arrow 2NaBr + Mg? I don't know how to determine this, other than that you separate the elements for the two half reactions. My other question is that when you're translating words and you have an element with Roman ...
*April 19, 2009*

**history**

just take the important things and just talk about it.
*April 17, 2009*

**math6**

840
*April 16, 2009*

**Math**

I think it's D.
*April 16, 2009*

**Math**

I used this equation 7500/120000=150000/x.
*April 16, 2009*

**Math**

i got $9,375.
*April 16, 2009*

**CHEM**

HCOOH + OH- --> COOH- + H20 Kb = [OH-][HCOOH]/[COOH-] = x^2/(0.0714-x) = 5.55 x 10^-11 x=1.99 x 10^-6 pOH = 5.70 pH = 14 - 5.70 = 8.30 ^ Will that also work?
*April 6, 2009*

**CHEM**

Calculate the pH of solution made by combining 75.0 mL of 0.10 M formic acid with 30.0 mL of 0.25 M KOH. (Ka for formic acid, HCOOH, is 1.8 X 10^-4)
*April 6, 2009*

**Chemistry**

Calculate the pH of solution made by combining 75.0 mL of 0.10 M formic acid with 30.0 mL of 0.25 M KOH. (Ka for formic acid, HCOOH, is 1.8 X 10^-4)
*April 6, 2009*

**chemistry**

(NH4)2CO3 = 2NH3 + CO2 + H2O If you have 3.5 moles of Ammonia how much carbon dioxide was also made?
*April 6, 2009*

**calc**

Give 2 positive and 2 negative angles that are coterminal with each angle? 1. 30 degrees 2. 135 degreed 3. -93 degrees
*March 31, 2009*

**calc check these please**

1. positive 360 and 390 negative -330 and -360 2. positive 135 and 720 negative -330 and -390
*March 31, 2009*

**calc**

Give 2 positive and 2 negative angles that are coterminal with each angle? 1. 30 degrees 2. 135 degreed 3. -93 degrees
*March 31, 2009*

**CHemistry**

Kaplan is not acceptable for cheating. This assignment is not hard and it only take 30 minutes if you use your time wisely. So I will not do your work for you.
*March 30, 2009*

**History**

How have the lessons learned from the Holocaust changed the world? What do you think has happened and how we are continually surprised when there are bad people doing evil things in the world.
*March 29, 2009*

**chemistry**

it has to be a final answer
*March 24, 2009*

**chemistry**

1 mol Cu(NO3)2*6H20 X 295.69g Cu(NO3)2*6H20/ mol Cu(N03)2*6H20=___________ gCu(NO3)2*6H20 what does in the blank?
*March 24, 2009*

**chemistry help**

can you help with the others as well?
*March 23, 2009*