Thursday

September 18, 2014

September 18, 2014

Total # Posts: 350

**chemistry**

The reaction described by the equation Zn + Hg2Cl2 <--> 2Hg +Zn+2 + 2Cl is run on electrochemical cell. The E^0 of the cell at 25 degrees C is 1.03V. In the same cell, [Cl-]=.10 M and [Zn+2] is unknown, and the measured cell voltage is 1.21V. Compute the value of [Zn+2] ...
*April 12, 2012*

**Chemistry 1201**

An unknown compound contains only carbon, hydrogen, and oxygen (C?H?O?). Combustion of 6.50 of this compound produced 9.53 g of carbon dioxide and 3.90 g of water. 1) How many moles of Carbon? 2) How many moles of Hydrogen?
*March 28, 2012*

**adding fractions**

what does one half plus one third equal?
*March 18, 2012*

**CALCULUS**

I'm currently on the same question after spending over 2 hours on it... What did you get?
*March 12, 2012*

**Chemistry**

consider the following reaction: 2CH3OH(g) yields 2CH4(g) + O2(g) change in enthalpy= 252.8kJ How many kilojoules of heat are released when 38.4 g of CH_4 g) reacts completely with O2 (g) to form CH3OH (g) at constant pressure?
*March 5, 2012*

**geometry**

how long is a stage that is 6 meters wide with an area of 48 sq meters?
*March 5, 2012*

**geom/trig**

i believe that you set it up like cos(x)= a/h a= 11 feet h= 40 feet then you take the inverse cos of 11/40
*March 5, 2012*

**Chemistry**

yes all of these parts are derived from the same problem How many kilojoules of heat are released when 38.4 g of CH4 (g) reacts completely with O2 (g) to form CH3OH (g) at constant pressure?
*March 5, 2012*

**Chemistry**

For a given sample of CH3OH, the enthalpy change during the reaction is 82.6 kJ. How many grams of methane gas are produced?
*March 5, 2012*

**Chemistry**

consider the following reaction: 2CH3OH(g) yields 2CH4(g) + O2(g) change in enthalpy= 252.8kJ Calculate the amount of heat transferred when 26.0 g of {\rm CH_3OH} (g) is decomposed by this reaction at constant pressure.
*March 5, 2012*

**CHEMISTRY**

which of the following represent a buffer system? A.) NaOH and NaBr B.) HF and NaF C.) HC2H3O2 and C12H22O11 D.) HCl and KOH
*March 3, 2012*

**CHEMISTRY**

write the conjugate acid for the following: A.) NO3- = B.) HPO4^2- = C.) Br- = D.) S2- =
*March 3, 2012*

**chemistry**

write the conjugate base for the following: A.) HCN= B.) HPO4^2- = C.) NH4+ = D.) HC2H3O2=
*March 3, 2012*

**Physics**

A satellite has a mass of 6000 kg and is in a circular orbit 3.30 105 m above the surface of a planet. The period of the orbit is two hours. The radius of the planet is 4.20 106 m. What is the true weight of the satellite when it is at rest on the planet's surface? I know ...
*March 2, 2012*

**Physics**

If a shoe is dropped from a height of 40m, what is its speed after falling for two seconds?
*February 29, 2012*

**math**

Two fractions have the same denominator. Which is the greater fraction: the fraction with the greater numerator or the lesser numerator?
*February 21, 2012*

**Math**

just do 120 divided by 20 the answer you get will be the number of hours it took him.
*February 20, 2012*

**science**

i need to find a website that has a picture of hafnium lamp filaments
*February 20, 2012*

**science**

on what website can i find info on things made of the element hafnium:a picture,how it's made, and why it is made with hafnium.
*February 19, 2012*

**SCIENCE**

pretend that the pattern is 1212312123. you would label it 12123.
*February 16, 2012*

**College Physics**

On planet Z, the standard unit of length is the foose. Ann the Astronaut is 5.90 feet tall on earth. She lands on planet Z and is measured to be 94 foosi tall. Her partner Rachael is 88 foosi tall. How tall is Rachael on Earth?
*February 4, 2012*

**Physics**

An astronaut of mass 70 kg carries an empty oxygen tank of mass 14 kg. He throws the tank away from himself with a speed of 3 m/s. With what velocity does the astronaut start to move through space?
*January 15, 2012*

**math**

if a hexagon has two right angles, what is the sum of the measures of the remaining angles?
*January 12, 2012*

**algebra**

A bag contains 4 orange marbles, 11 blue marbles and 1 yellow marble. What is the probability of drawing a blue followed by another blue without replacement? Not sure what to do?
*December 11, 2011*

**calculus**

F(x)=e^(-3x/2) Let R be the region between the graph of f and the x-axis on the interval 0 to 1 . Find the volume V of the solid of revolution generated by revolving R about the x-axis. Give both exact (symbolic) and approximate (numeric) answers.
*November 28, 2011*

**english **

what is the adverb in the sentence They are always late for ballgames. is it always
*November 17, 2011*

**English**

A good writer makes events in a story occur plausibly. The action should be consistent with the characters; if the author forces them into uncharacteristic behavior in order to advance the plot, the story will seem artificial. In "Thank You, M'am, " by Langston ...
*November 9, 2011*

**Science (Chemistry)**

I'm not sure how to do a couple of problems on my chemistry worksheet. Can you please help me? You dissolve 0.00902 g of naOH in enough water to make 1000 mL. What is the Ph of this soultion. What is the molarity, pH, and pOH of 5.00 of naOH in 750.0 mL of soultion. I know...
*November 6, 2011*

**Math**

Robert gave one-half of his marbles to Dean. Then he gave two-thirds of the remaining ones to Mark. If he ended up with 10, how many did he have when he stsrted?
*November 2, 2011*

**Physics**

A crow is flying horizontally with a constant speed of 2.50 m/s when it releases a clam from its beak. The clam lands on the rocky beach 2.20 s later. Consider the moment just before the clam lands. (Neglect air resistance.) A) What is its horizontal component of velocity? B) ...
*October 24, 2011*

**Physics**

In Denver, children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target on the ground. Suppose that the tower height is h = 9.80 m, and that the bulls-eye is a horizontal distance of d = 3.2 m from the launch point. If the pumpkin...
*October 24, 2011*

**math**

What i think is Samuel because he gets 6 DVDs and he's only paying a little bit more
*October 19, 2011*

**Math**

If you jog for half an hour everyday for nine days. Write an improper fraction that shows the total number of hours you jogged.
*October 13, 2011*

**Math**

If you jog for half an hour everyday for nine days. Write an improper fraction that shows the total number of hours you jogged.
*October 13, 2011*

**Math**

If you jog for half an hour everyday for nine days. Write an improper fraction that shows the total number of hours you jogged.
*October 12, 2011*

**chemistry**

N2 (g) + 3H2 (g) → 2NH3 (g)ΔH = -92.6 Calculate ΔH (in kJ) for the decomposition of 30.5 g NH3 (g) into N2 (g) and H2 (g)
*October 12, 2011*

**Science**

I tried but I cant find it.:O
*October 12, 2011*

**Science**

Which of the following quickly changes the land when gravity pulls loose rocks and soil down the side of a hill? A)a volcanic eruption B) an earthquake C) a fault D) a landslide
*October 12, 2011*

**Pre-Algebra**

Make a table with all the whole number pairs of length and width values that give an area of 24 square meters.
*October 3, 2011*

**math**

graph the points in each group and connect each point with the next point using straight line segments. Do not connect the last point in one group with the first point in the next group.
*September 25, 2011*

**Physics**

On an inclined plane, the Fn is only = to the y component of the Fg or vice versa.
*July 14, 2011*

**science**

a piece of wood that measures 3.0 cm by 4.0 cm by 5.0 cm has a mass of 90.og. what is the density of the wood? would the piece of wood float in water? remember the density of water is 1.00g/ml
*June 21, 2011*

**Science**

i have to do a research project on dolphins
*May 24, 2011*

**4th grade math**

you add two
*May 19, 2011*

**geometry**

The radius of a circle is 6cm and the arc measurement is 120 degrees, what is the length of the chord connecting the radii of the arc?
*May 6, 2011*

**English 102**

I think your kind of young to be asking about that kind of stuff
*April 29, 2011*

**Math**

Estimate to the nearest integer. Square root of -55
*April 28, 2011*

**calculus**

I posted one before but this is another one of those problems that i need help with! I don't know how to approach this one at all! Please help use the definition of the derivative to find f'(x) when f(x)= (4/x^2)+(2/5*x)
*April 24, 2011*

**calculus**

:( please help?
*April 24, 2011*

**calculus**

sorry! the numerator is 2+x and the denominator is x^3
*April 24, 2011*

**calculus**

I am learning derivatives and I despise having to use the definition of the derivative. Please check my answer for this particular one! it is different from the one I get by differentiating. The question: f(x) = 2+x / x^3 my answer: -6x^2-2x^2
*April 24, 2011*

**math**

Brown checked out 4 books and 1 videotape at the library. He returned them all 7 days late the library charges late fees at $3.00 per week for a video and $0.15 per day for a book. Write an expression that represents browns change if he paid his late fees with a $10 bill?
*April 17, 2011*

**science**

why are dog fleas more successful parasitesthen bacteria that cause deadly diseases?
*April 13, 2011*

**math**

Mary's group of close friends are going to fifth grade in September. All are going to Belleview Elementary and their homerooms will be room 12, 14, or 16. All of her friends but 4 are going o room 12, all but 4 are going to room 14, and all but 4 are going to room 16. Not ...
*April 10, 2011*

**math**

MathMate attempted to help but did not show how the problem is answered. It only confused the problem. Could someone else please help? Thanks. The denominator of a fraction is 4 more than the numerator. If both the denominator and the numerator are increased by 1, the ...
*March 26, 2011*

**math**

The denominator of a fraction is 4 more than the numerator. If both the denominator and the numerator are increased by 1, the resulting fraction equals 1/2. What is the original fraction? **Need to show all work** Thanks for the help.
*March 26, 2011*

**chemistry**

How many milliliters of 3.0 M hydrochloric acid are i required to prepare 500 milliliter of 1.0 M Hydrochloric solution
*March 15, 2011*

**Math**

plot 7 on the x axis
*March 15, 2011*

**math**

Please help my equivalent fraction. I am greater than 1/5 and less than 1/2. My denominator is between 2 and 4. What fraction am I? Thanks for the help..
*March 9, 2011*

**chemistry**

A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?
*March 3, 2011*

**chemistry**

A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?
*March 3, 2011*

**chemistry**

A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?
*March 3, 2011*

**ipc**

how much power is used to move a 25 kg mass 8 meters in 15 seconds
*February 28, 2011*

**Math**

90/65=.7222*5=3.6111+5=8.6111 8.1 feet
*February 27, 2011*

**ap chem**

ok, i'm given: Ethylene Glycol C2H6O2 is the main ingredient in antifreeze. density of pure EG: 1.132 g/mL Anti-freeze is 32% by volume EG I have to find: Volume of Eg in 1 L Mass of Eg in 1 L & the Volume of "solvent" in 1 L Can someone help me? and give me some...
*February 27, 2011*

**ap chem**

ok, so i have to find the mass of the HNO3 in 1 L and the mass of the H2O in 1 L. I'm given: HNO3 solution 1.42 g/mL 16M I'm really terrible at this stuff and it should be easy, but I have no idea where to start.
*February 25, 2011*

**ap chem**

ok, sweet. i had most of that set up right. so the mass of HNO3 = 1008 g & the mass of H2O = 412 g?
*February 25, 2011*

**ap chem**

ok, so i have to find the mass of the HNO3 in 1 L and the mass of the H2O in 1 L. I'm given: HNO3 solution 1.42 g/mL 16M I'm really terrible at this stuff and it should be easy, but I have no idea where to start.
*February 25, 2011*

**ap chem**

would you multiply the 93.37 and the 1.071 then? is 100g correct?
*February 24, 2011*

**ap chem**

would it be 89.28 g?
*February 24, 2011*

**ap chem**

I'm supposed to find the mass of NaCl in 1 L & the mass of H20 in 1 L. I'm given NaCl solution. 1% by mass. The Density is 1.071 g/mL. I know the answer for NaCl is 10.71 g, but I don't know where to start to get to this. Could you lead me in the right direction?
*February 24, 2011*

**essay writing**

same here... yall should rethink your answer
*February 3, 2011*

**spelling 2nd grade**

give me a senec with prehistoric
*January 23, 2011*

**geometry**

the area of the first triangle is 22 sq feet. if the scale factor of two similar traingles if 3, what is the area of that second triangle>?
*January 18, 2011*

**Science**

very urgent!!!!!!!!! plzz plzz answer or attempt!
*January 18, 2011*

**Science**

8. The balanced equation P4 (s) + 6H2 (g) --> 4PH3 tells us that 2 mol H2 a. reacts with 1 mol 4 b. produces 4 mol PH3 c. cannot react with phosphorus d. produces 2 mol PH3 e. reacts with 2 mol P4 idk y i cant seem to get the answer from the choices above?
*January 18, 2011*

**math**

1 1/12 = 13/12 =2-13/12 = 24/12-13/12 =11/12 of a cake left over.
*January 18, 2011*

**chemistry**

Yupp, Calcium Hydroxide. Ca is the cation --> calcium OH is the polyatomic anion--> hydroxide (: Hope it helped!
*January 18, 2011*

**algebra**

(6y+1)(6y-1)
*January 18, 2011*

**Chem 11**

4.21
*January 18, 2011*

**Geometry**

Right triangle
*January 18, 2011*

**Visual Basic - Computer Science**

Public Class Form1 Public SparkPlugsString(,) As String = {{"VBAutoPart", "Brand A", "Brand C", "Brand X"}, {"PR214", "MR43T", "RBL8", "14K22"}, {"PR223", "R43", "RJ6"...
*December 19, 2010*

**Visual Basic - Computer Science**

I'm trying to right a program with Multidimensional Arrays. These are the instructions for the program: The Valley Boulevard (VB) Auto Center management is pleased with your progress in developing their system. They require you to develop a new feature for their system. ...
*December 19, 2010*

**chemistry**

using a universal ph paper to test the Ph of purple grape juice is unlikely to be successful why
*December 15, 2010*

**Physics **

Define the focal length of a convex mirror?
*December 14, 2010*

**Math**

x+2=6 and its under a square root thing
*December 11, 2010*

**Math**

3x-6y=12 find the slope, y intercept and general equation
*December 11, 2010*

**Math**

solve using addition or subtration 12x+9y= 14 6x= 7y - 16
*December 11, 2010*

**math**

Mrs.penn has a circular tablecloth with a circumference of 29 feet. Which expression could be used ro find the radius of the tablecloth? f. 29 - 2 pie g. 29/2 pie h. 29/pie j 29 + 2pie
*December 6, 2010*

**Chemistry**

the idea expressed in whims is known as
*December 3, 2010*

**sience**

chief or ruler .
*November 30, 2010*

**5th grade**

what is the smallest number of pencils that are needed to put into jars holding 3,6 and 9 leaving no remainder.
*November 23, 2010*

**precal**

the terminal side of an angle in standard position coincides with the line y=x in quadrant I. find tan to the nearest thousandth
*November 17, 2010*

**Math**

if four friends share equally a 48 ounch bag of popcorn what fraction would each one get?
*November 8, 2010*

**algebra**

x/14+12=3x-8.5
*November 4, 2010*

**algebra**

x/14+12=3x-8.5
*November 4, 2010*

**Algebra**

x/14+12=3x-8.5
*November 4, 2010*

**Math**

Find a number whose square root is 24 more than 5 times the number. How do I set up this problem? Thank you for any help!
*October 23, 2010*

**algebra I**

Find a number whose square root is 24 more than 5 times the number. How do I set up this problem?
*October 23, 2010*

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