Friday

February 27, 2015

February 27, 2015

Total # Posts: 1,729

**Chemistry**

What is the [S^-2] in a saturated solution (.1 M) of H2S, in which the pH had been adjusted to 5.00 by the addition of NaOH? For H2S, Ka1= 1.1X10^-7 and Ka2=1.0X10^-14
*February 13, 2011*

**Chemistry**

if u add if you add 2.0 ml of 10.0 M HCl to 500 ml of a .10 M NH3, what is the pH of the resulting solution? for NH3, kb=1.8X10^-5
*February 13, 2011*

**ap chem**

.004
*February 13, 2011*

**Chemisrty**

what is the molality of a 0.075m of ethyl alcohol in water at 25 degrees celcius. Assume the density of the solution at such low concentration is equal to that of water at 25 degrees celcius, 0.997g/ml
*February 13, 2011*

**Math**

f(x)=-x
*February 13, 2011*

**business**

Research the VISA website. After reviewing of all the documents you can find on the web and in libraries, write a 3-page response to the following questions
*February 13, 2011*

**calculus, limits, l'hopital**

Thanks. I made a really stupid error. You've been very helpful in answering my calc questions. I really appreciate it.
*February 13, 2011*

**calculus, limits, l'hopital**

Find the limit as x->0 of (2-2cos(x))/(sin(5x)) Mathematically I got 2/5, but on the graph it appears to be 0.
*February 13, 2011*

**math**

is that 9 times q times t times 9 times p times t?
*February 13, 2011*

**math**

i dont get scale draings how do you work it out?
*February 13, 2011*

**Minds at work**

A person that has a sevre overreation to an intense emotion might be experiencing a a. galvanic skin response b. sympathetic rebound c. suppressed emotion d. parasympathetic rebound if you relearn a song that you heard as a child, your savings score for relearning the song ...
*February 11, 2011*

**Teacher's Aide: Helping Abused Children**

I don't mean to be mean on this end but that is a very rude thing to ask anyone. 1st off i'm newly married, 6 months pregnant, and this is not the only thing that i'm going to school for. i actually have a 91% in my class and this is the only test that i've had...
*February 11, 2011*

**Teacher's Aide: Helping Abused Children**

i for got to post my answers: 1) B 2) D 3) A 4) A 5) C 6) B 7) D 8) A 9) C 10)C
*February 11, 2011*

**Teacher's Aide: Helping Abused Children**

1. The Stubborn Child Law enacted by Massachusetts in 1646 permitted parents to A. use corporal punishment when children disobeyed them. B. keep children out of school if they were needed for family work purposes. C. institutionalize a child born with a physical or mental ...
*February 11, 2011*

**algebra**

Let x = the salary of the husband. So Lien earned x+1700. Lien's salary + her husband's = 42100 x + 1700 + x = 42100 2x + 1700 = 42100 2x = 40400 x = 20200 Lien's husband earned $20200, and Lien earned 1700 + 20200 = $23900.
*February 10, 2011*

**Math**

What are the directions? It's not clear what to do.
*February 10, 2011*

**calculus**

Set the denominator equal to zero and solve for x. 3x-14 = 0 3x=14 x=14/3 This is the x-coordinate of the vertical asymptote.
*February 10, 2011*

**math 5th grade**

First I would choose a number divisible by 9 to use as an example. I chose 81. If 8/9 of the customers ordered coffee, that's 8/9*81 = 72 customers. If reg coffee was ordered three times as much as flavored, then you want to set it up like this: 3x + x = 72 4x = 72 x = 18 ...
*February 10, 2011*

**Math**

It depends a little on what math class you're in how they want you to solve this. But basically, this function is a parabola and you need to find the vertex. x=-b/(2a), where a=-0.5, and b=12 x=-12/(2*-0.5)=12, this is the x coordinate of the vertex and also the number of ...
*February 10, 2011*

**math**

First subtract 45-27 = 18 Then subtract 5-8 = -3. Next multiply 3 by -3 = -9 then divide 18 by -9 = -2 finally, the absolute value of -2 = 2.
*February 9, 2011*

**Repost- Calculus; someone please help**

Yes it is the right equation. Good job!
*February 9, 2011*

**calculus, limits, l'hopital**

Here's what's weird: I graphed the equation and from the left the function approaches 1 as x approaches zero, and from the right it approaches e^3. Doesn't that mean the limit does not exist? The question, however, is multiple choice, with choices of infinity, 0, 3...
*February 9, 2011*

**calculus, limits, l'hopital**

Thank you so much! I didn't think to remove the 6x. So helpful, thank you!!
*February 9, 2011*

**calculus, limits, l'hopital**

Using l'hopital's rule, find the limit as x approaches zero of (e^(6/x)-6x)^(X/2) I know l'hopital's rule, but this is seeming to be nightmare. I just don't seem to get anywhere. I mistyped the first time I posted this question.
*February 9, 2011*

**advanced funtions**

Similarities: Domain and Range the same. Same end behavior, you could say "as x approaches infinity or negative infinity". Differences: They don't have the same reflection characteristics because an x^4 function can have non-symmetrical bumps in it. They're ...
*February 9, 2011*

**calculus, limits, l'hopital**

Using l'hopital's rule, find the limit as x approaches infinity of (e^(6/x)-6x)^(X/2) I know l'hopital's rule, but this is seeming to be nightmare. I just don't seem to get anywhere.
*February 9, 2011*

**math**

6.4-y = 6 and 2/5 convert 6 and 2/5 to decimal... 2/5=.4 6.4 - y = 6.4 subtract 6.4 from both sides -y = 0 divide both sides by -1 y = 0
*February 9, 2011*

**Math**

1.24*10^-3 = .00124
*February 9, 2011*

**algebra word problems**

294/14=21 L=6*21=126
*February 9, 2011*

**8th grade math**

935*1.4 mil = P*4.5 mil (mult 935 by 1.4) 1309 mil = P*4.5 mil (divide both sides by 4.5) 290.8888888888888=P So P = $290.89
*February 9, 2011*

**I need an answer--molecular/electron geometry**

THanks so much
*February 8, 2011*

**I need an answer--molecular/electron geometry**

Can anyone help me out with the differences between electron geometry and molecular geometry for SCl6? I think the molecular geometry is octahedral, but I'm not so sure for the electron geometry. Thanks :) *My earlier post wasn't answered, so I'd appreciate some ...
*February 8, 2011*

**math**

put it into simple form?
*February 8, 2011*

**Equivalent. Fraction**

What is 6/12 in a equivalent fraction
*February 8, 2011*

**Algebra**

56/21?
*February 8, 2011*

**Molecular and Electron geometry**

Can anyone help me out with the differences between electron geometry and molecular geometry for SCl6? I think the molecular geometry is octahedral, but I'm not so sure for the electron geometry. Thanks :) *My earlier post wasn't answered, so I'd appreciate some ...
*February 8, 2011*

**math**

if a figure has 48 square units as it's area and 38 units as it's perimeter what would the figure look like?
*February 8, 2011*

**english**

diction?
*February 7, 2011*

**Molecular and Electron geometry**

Can anyone help me out with the differences between electron geometry and molecular geometry for SCl6? I think the molecular geometry is octahedral, but I'm not so sure for the electron geometry. Thanks :)
*February 7, 2011*

**REPORT CARD QUESTION**

Congrats
*February 7, 2011*

**science**

The formula for frequency is: frequency = 1 / T, where T = Period. That is e.g. "cycles per second". The formula for time is: T (Period) = 1 / frequency. Note: T = Period and t = Time
*February 6, 2011*

**SCl6 is used in....?**

Thank you very much
*February 6, 2011*

**SCl6 is used in....?**

But elements compose compounds. So a compound, say SCl6, cannot create silicon dioxide. . . . I'm now thoroughly confused.
*February 6, 2011*

**SCl6 is used in....?**

But isn't SCl6 a compound within itself?
*February 6, 2011*

**SCl6 is used in....?**

Does anyone know what SCl6 is used in? Note: I don't mean SF6. *Sulfur Hexachloride* Thank you :)
*February 6, 2011*

**SCl6, Sulfur Hexachloride**

Very helpful, thank you!
*February 4, 2011*

**SCl6, Sulfur Hexachloride**

I have a project on Sulfur Hexachloride, or SCl6, but I can't find any info on it! Any help?
*February 4, 2011*

**Chemistry**

I have a project on Sulfur Hexachloride, or SCl6, but I can't find any info on it! Any help?
*February 4, 2011*

**Chemistry**

your dumb
*February 1, 2011*

**Chemistry**

When ice melts, it absorbs 0.33 per gram.How much ice is required to cool a 12.0 drink from 72 to 37, if the heat capacity of the drink is 4.18 ? (Assume that the heat transfer is 100 efficient.)
*February 1, 2011*

**physics**

A tennis ball is shot vertically upward from the surface of an atmosphere-free planet with an initial speed of 20.0 m/s. One second later, the ball has an instantaneous velocity in the upward direction of 15.0 m/s. What is the magnitude of the acceleration due to gravity on ...
*February 1, 2011*

**physics**

Explain why the occupants in a running car observe objects on the roadside as though they are running backwards.
*January 27, 2011*

**public relation**

what has the result of what the artist Chris Brown led for the public to say or view him?
*January 26, 2011*

**technology**

does that mean the hard drive size or this Double-layer DVD±RW/CD-RW or something
*January 26, 2011*

**technology**

what does Hard Disk-FDD/HDD mean?
*January 26, 2011*

**Geometry**

In Triangle SUM, if SU = 10 cm and UM = 15 cm then MS must be less than how many centimeters? 10 15 20 25...... Am I right?
*January 25, 2011*

**english**

like you might avoid paying your bill in order to purchase something you want
*January 23, 2011*

**english**

What effect does lacking personal responsibility have on materialism?
*January 23, 2011*

**geometry**

Find the perimeter of an isosceles trapezoid with base lengths of 10 and 18 and height of 8.
*January 20, 2011*

**geometry**

Find the perimeter of an isosceles trapezoid with base lengths of 10 and 18 and height of 8.
*January 20, 2011*

**chemistry**

A catalytic converter combines 2.55 g CO with excess O2.What mass of CO2 forms?
*January 20, 2011*

**algebra**

11T over 28 - T over 4=1
*January 19, 2011*

**math**

4x27= partial products: product:
*January 10, 2011*

**physics/chemistry**

(a) An ideal gas occupies a volume of 1.0 cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container. i got that right to be 2.5e19 molecules (b) If the pressure of the 1.0 cm3 volume is reduced to 1.0 10-11 Pa (an extremely good vacuum...
*January 3, 2011*

**physics/chemistry**

oh, ok. that makes sense. Thanks!
*January 3, 2011*

**physics/chemistry**

i am getting .15 and .24 and i keep getting it wrong. i dont know what im doing wrong.
*January 3, 2011*

**physics/chemistry**

A rigid tank contains 0.40 moles of oxygen (O2). Determine the mass (in kg) of oxygen that must be withdrawn from the tank to lower the pressure of the gas from 37 atm to 23 atm. Assume that the volume of the tank and the temperature of the oxygen are constant during this ...
*January 3, 2011*

**physics**

An object weighing 325 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 250 N. Immersed in oil, the object weighs 275 N. (a) Find the density of the object. (b) Find the density of the oil.
*December 19, 2010*

**calculus**

Find all the critical numbers for the function f(x) = cube root of 9-x^2. help please?!
*December 17, 2010*

**helping abused children**

here let me help you: The Stubborn Child Law enacted by Massachusetts in 1646 permitted parents to A. use corporal punishment when children disobeyed them. B. keep children out of school if they were needed for family work purposes. C. institutionalize a child born with a ...
*December 16, 2010*

**Principles of finace**

How do you find use the annual net profit with the payables and inventory costs to determine the total annual cost a firm would need to achieve the industry level of operational efficiency?
*December 14, 2010*

**chem**

the ionization energy for atomic hydrogen is 1.31x10^6 J/mol. what is the ionization energy for He^+
*December 14, 2010*

**physics**

A container is filled to a depth of 15.0 cm with water. On top of the water floats a 27.0 cm thick layer of oil with specific gravity 0.800. What is the absolute pressure at the bottom of the container.
*December 14, 2010*

**math**

the sum of two decimal numbers is 3.9. their difference is 0.9, and their poduct is 3.6 what are these two numbers?
*December 14, 2010*

**childhood obesity**

what are some question you can ask to a child that is overweight?
*December 8, 2010*

**Organic Chemistry**

I just finished an organic chemistry lab experiment on separating and analyzing an unknown acid/neutral compound mixture using extraction, recrystallization, TLC, melting point analysis, and IR spectrum. In the instructions, "Obtain an IR spectrum for each of your ...
*December 6, 2010*

**Chemistry**

Use average bond energies to calculate delta Hrxn for C(s)+2H2O(g)-->2H2(g)+CO2(g)
*December 5, 2010*

**english**

like what are some specefic ideas as to what he did to improve them
*December 4, 2010*

**english**

question How would you think a writer would hope to see themselves as a writer in the future? What should they still need to learn to strenghten it to make it better?
*December 4, 2010*

**English 101**

uncanny- to be too strange marvelous- extremely good or great
*December 4, 2010*

**Chemistry Kinetics**

well i guess I need the negative sense it's the reactant -d[H2 + I2]/dt = k[H2]^x[I2]^y is this correct?
*December 1, 2010*

**Chemistry Kinetics**

If I had the equation H2 + I2 --> 2HI could I write the rate of reaction as d[H2 + I2]/dt = k[H2]^x[I2]^y were x is the order of reaction with respect to x and y is just the order of reaction with respect to y thanks
*December 1, 2010*

**math**

why the formula for the area of a trapezoid this A=1/2 x h x(a+b)
*December 1, 2010*

**Pre-Calcs**

Amount after time t A (t) = yobt Where: yo = starting amount b = growth constant (percent remaining) t = number of time units In the 1978 the population of blue whale in the southern hemisphere was thought to number 5000. Since whaling has been outlawed, and an abundant food ...
*December 1, 2010*

**physics**

A 7.2 cm tall cylinder floats in water with its axis perpendicular to the surface. The length of the cylinder above water is 1.4 cm. What is the cylinder's mass density?
*November 30, 2010*

**physics**

What is the apparent weight of a 36 kg block of aluminum (density 2700 kg/m3) completely submerged in a fluid with density 1300 kg/m3?
*November 30, 2010*

**physics**

A single conservative force F = (7.0x - 11)i N, where x is in meters, acts on a particle moving along an x axis. The potential energy U associated with this force is assigned a value of 29 J at x = 0. (a) What is the maximum positive potential energy? At what (b) negative ...
*November 29, 2010*

**physics**

A stone with a weight of 5.38 N is launched vertically from ground level with an initial speed of 25.0 m/s, and the air drag on it is 0.269 N throughout the flight. What are (a) the maximum height reached by the stone and (b) its speed just before it hits the ground
*November 29, 2010*

**chemistry**

Find the pH of a buffer that consists of 1.6 M sodium phenolate (C6H5ONa) and 1.0M phenol (C6H5OH). (pKa of phenol=10.00)
*November 29, 2010*

**Math**

can you explain how you figures out Heather's portion of the bill
*November 29, 2010*

**chem**

What is the volume of 325 mL of a sample of gas at 51.0°C and 710. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.
*November 29, 2010*

**chem**

What is the volume of 325 mL of a sample of gas at 51.0°C and 710. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.
*November 29, 2010*

**chemistry**

NH4NO3(s) H2O(g) + N2(g) + O2(g) Consider the unbalanced equation above. What will be the total volume of gas produced at 720. mm Hg and 570.0°C when 2.50 g of NH4NO3 completely decomposes? Use molar masses with at least as many significant figures as the data given.
*November 29, 2010*

**chemistry**

How many kilojoules of heat is required to completely covert 60.0 grams of water at 32.0° C to steam at 100°C? For water: s = 4.179 J/g °C Hfusion = 6.01 kJ/mol Hvap = 40.7 kJ/mol
*November 29, 2010*

**chemistry**

How many kilojoules of heat is required to completely covert 60.0 grams of water at 32.0° C to steam at 100°C? For water: s = 4.179 J/g °C Hfusion = 6.01 kJ/mol Hvap = 40.7 kJ/mol
*November 29, 2010*

**spanish**

Direct- and indirect-object pronouns combined 8-16 Dos amigas hablan. Completa las oraciones. MARÍA: Juanita, ¿quién ______ mandó las flores? JUANITA: Alejandro ____, ____ mandó. MARÍA: ¿Vas a mostrar ____ a tus papás? ...
*November 29, 2010*

**math**

6+7_<__7+6
*November 22, 2010*

**math**

fill in the correct symbol. < = > 6+7 __ 7+6
*November 22, 2010*

**1st grade**

how iam going to fix this sentence. i go to scott elementary school
*November 22, 2010*

**physical science**

how much power is used to lift a 100-n bucket a distance of 10-m in 12 seconds
*November 21, 2010*

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