Saturday

January 31, 2015

January 31, 2015

Total # Posts: 274

**Acid-base titration**

A weak acid HA (pKa = 5.00) was titrated with 1.00 M KOH. The acid solution had a volume of 100.0 mL and a molarity of 0.100 M. Find the pH at the following volumes of base added and make a graph of pH versus Vb: Vb = 0, 1, 5, 9, 9.9, 10, 10.1, and 12 mL.
*January 23, 2012*

**physics**

A puck on a horizontal, frictionless surface is attached to a string that wraps around a pole of finite radius, as shown in the figure . As the puck moves along the spiral path, does its speed increase, decrease, or stay the same?
*January 22, 2012*

**language arts**

are my feet are killing me is a alliteration, personification , or hyperbole?
*December 8, 2011*

**physics**

A 19.2-kg box rests on a frictionless ramp with a 16.1° slope. The mover pulls on a rope attached to the box to pull it up the incline. If the rope makes an angle of 43.6° with the horizontal, what is the smallest force F the mover will have to exert to move the box up...
*October 2, 2011*

**Calculus**

Can someone explain to me how to do these? Given the following definite integral and n=4 answer the following questions. (Round your answers to six decimal places.) 1. Use the Trapezoidal Rule to approximate the definite integral. Answer: T4= 2. Use the Midpoint Rule to ...
*September 29, 2011*

**AP World History**

I took college levels classes AT A COLLEGE beginning when I was 13 years old and I accumulated over 40 credits toward college before I was 18 years old. Don't let anyone tell you you can't understand college materials. Before you search the text of your textbook for ...
*September 15, 2011*

**Physics**

A positive charge Q is on the y-axis at a distance a from the origin, and another positive charge q is on the x-axis at a distance b from the origin. A) For what values(s) of b is the x-component of the force on q a minimum? B) For what values(s) of b is the x-component of the...
*September 6, 2011*

**Physics**

A positive charge Q is on the y-axis at a distance a from the origin, and another positive charge q is on the x-axis at a distance b from the origin. A) For what values(s) of b is the x-component of the force on q a minimum? B) For what values(s) of b is the x-component of the...
*September 6, 2011*

**math**

mathematical expression of: 1.) 75-5 2.) 14x(3+4) 3.) 3x(11+6) 4.) 1+(6+8) 5.) 20+5-80 6.) 4x2+5
*June 7, 2011*

**algebra 1 honors**

If r=5/3r+20/3, what is r? URGENT!!!!
*May 2, 2011*

**calculus**

Decide on what substitution to use, and then evaluate the given integral using a substitution. HINT [See Example 1.] (Round your decimal coefficients to four decimal places.) x/(2x^2-1)^0.4 dx
*May 2, 2011*

**Chemistry**

Compound A reacts with element B (a halogen) to form compounds C and D as the only products. When 2.000 grams of B react with an excess of sodium metal 2.363 grams of the sodium halide are formed. Compound A is a volatile liquid at room temperature with a density of 0.8800g/ml...
*April 17, 2011*

**college**

HORIZONTAL LINE X | Y ___|___ -3|2.25 -2|2.25 -1|2.25 0|2.25
*April 3, 2011*

**equation**

what is the equation of calculating 5/90 lottery winning numbers if these numbers were selected for the first week 24-13-6-60-70
*March 28, 2011*

**Calculus**

Let y(x)=ln(cosh(x)+ sqrt(cosh^2(x)−1)) Find the derivative Dxy= I dont know what to do with this...
*March 16, 2011*

**Calculus Please Help**

Let y(x)=ln(cosh(x)+ sqrt(cosh^2(x)−1)) Find the derivative Dxy= I dont know what to do with this...
*March 15, 2011*

**Calculus**

Let y(x)=ln(cosh(x)+ sqrt(cosh^2(x)−1)) Find the derivative Dxy= I dont know what to do with this...
*March 15, 2011*

**chemistry**

Determine the weight of Calcium Carbonate decomposed to produce 4 liters of Carbon Dioxide.
*March 12, 2011*

**Chemistry**

A student titrates 0.025 M KOH into 50.00 ml of a solution of unknown weak acid HA. Equivalence point is reached when 30.00 ml of the KOH has been added. After 15.00ml of the KOH has been added the pH of the mixture is 3.92. A. What is the concentration of HA ? B. What is Ka ...
*March 10, 2011*

**Chemistry**

A student titrates 0.025 M KOH into 50.00 ml of a solution of unknown weak acid HA. Equivalence point is reached when 30.00 ml of the KOH has been added. After 15.00ml of the KOH has been added the pH of the mixture is 3.92. A. What is the concentration of HA ? B. What is Ka ...
*March 10, 2011*

**Calculus**

Find d^2x/dt^2 as a function of x if dx/dt=4xcosx.
*March 10, 2011*

**5th grade math**

5/6 x 24=
*March 8, 2011*

**Chemistry**

CaCO3(s) <--> CaO(s) + CO2 (g) A 5.9-gram sample of CaCO3 (molar mass = 100.) is placed in an evacuated 2.00L container and heated to 200^oC. Equilibrium is reached when 5.15% of the CaCO3 has decomposed. 1)Write the Kp expression for this reaction and calculate its ...
*March 3, 2011*

**Algebra**

Factor the following trinomial: w^18 – 9w^9y^5 + 14y^10
*March 2, 2011*

**Algebra**

Can you write a binomial in standard form with a degree of 0? Can you write a binomial with a degree of 3? Explain.
*March 1, 2011*

**Chemistry**

A student finds that 1.00 g of a monoprotic acid, HA , requires 50.0 ml of 0.100 M KOH to neutralize it. What is the molar mass of the acid?
*February 17, 2011*

**Chemistry**

A student finds that 1.00 g of a monoprotic acid, HA , requires 50.0 ml of 0.100 M KOH to neutralize it. What is the molar mass of the acid?
*February 17, 2011*

**History**

thats okay...i got the answer from some other hw website....thnx!(for nothing)
*February 16, 2011*

**History**

could you please just give me the answer in paragraph form
*February 16, 2011*

**History**

in one paragraph describe how the Monroe Doctrine has shaped the recent foreign policy decisions made by the U.S.
*February 16, 2011*

**Algebra **

5 to 6 miles / day
*February 13, 2011*

**algebra**

Width = w Length = w + 3 w(w+3)= 108sf I just plugged #'s into "w" until I found the one that fit. w = 9ft L = w+3 = 12ft
*February 13, 2011*

**Chemistry**

Answer the following question A(g) <--> B (g) + C(g) Kp = 2.00 Assume you placed 1.0 mole each of 'A' , 'B' , and 'C' in a container. Without actually doing the calculations explain how you would determine whether or not the system is at ...
*February 11, 2011*

**Chemistry**

Answer the following question A(g) <--> B g) + C(g) Kp = 2.00 Assume you placed 1.0 mole each of 'A' , 'B' , and 'C' in a container. Without actually doing the calculations explain how you would determine whether or not the system is at ...
*February 11, 2011*

**8th grade math**

Answer to Jade: The bottom of the Trapezoid =x, the top = (1/3x), the sides then = (1/3x + 4"). So the equation looks like this: x + 1/3x + (1/3x + 4) + (1/3x +4)=56 Solve for X: 2x + 8 = 56 then x=24 Plug your # for x back into the dim. for each side and you get: Bottom...
*February 9, 2011*

**maths**

the region in the first quadrant bound by the graphs y=(x*x*x)/3 and y=2x is revolved about the y-axis. find the volume of the resulting solid.
*February 7, 2011*

**maths**

determine the co-ordinate of the poin of intersection of the curves y=x*x and y*y=8x. sketch the two curves and find the area enclosed by the two curves.
*February 7, 2011*

**Linear Programming**

Tab 1: Linear Program: 50 points Consider the Linear Program: Max 2A + 3B s.t. 1A + 2B <= 6 5A + 3B <= 15 A, B >= 0 Use the Solver function of MS Excel to determine the optimal solution for this problem. What is the value of the objective function?
*January 20, 2011*

**Chemistry**

Explain the following observation in terms of the collision theory, restricting each to about 25 words. NO(g) + O3(g)--> NO2(g) + O2(g) (a) An increase in temperature increases the reaction rate. (b) Compressing the gases into a smaller volume increases the reaction rate. (...
*January 20, 2011*

**Chemistry-DrBob222**

A certain compound contains carbon, hydrogen , and oxygen. When 1.00 grams of this compound are burned in oxygen gas 1.47 grams of CO2 and 0.600 grams of water are formed. When 2.75 grams of the compound are dissolved in 10.0 grams of water the resulting solution freezes at &#...
*January 17, 2011*

**Chemistry**

See bottom Patrick A certain compound contains carbon, hydrogen , and oxygen. When 1.00 grams of this compound are burned in oxygen gas 1.47 grams of CO2 and 0.600 grams of water are formed. When 2.75 grams of the compound are dissolved in 10.0 grams of water the resulting ...
*January 17, 2011*

**Chemistry**

In number 2.Is the delta Tf = to -2.84? I came up with 180 but confused with how -2.84 is delta Tf
*January 16, 2011*

**Chemistry**

A certain compound contains carbon, hydrogen , and oxygen. When 1.00 grams of this compound are burned in oxygen gas 1.47 grams of CO2 and 0.600 grams of water are formed. When 2.75 grams of the compound are dissolved in 10.0 grams of water the resulting solution freezes at &#...
*January 16, 2011*

**Chemistry**

A certain compound contains carbon, hydrogen , and oxygen. When 1.00 grams of this compound are burned in oxygen gas 1.47 grams of CO2 and 0.600 grams of water are formed. When 2.75 grams of the compound are dissolved in 10.0 grams of water the resulting solution freezes at &#...
*January 16, 2011*

**Chemistry**

The molecular formula of a compound containg only carbon and hydrogen is to be determined. When a sample of the compound is burned on oxygen gas, 7.2 grams of water and 7.2 liters of carbon dioxide gas are produced(measured at STP). When 0.600grams of the compound are ...
*January 9, 2011*

**Chemistry**

Can't view the sight can u help me work it out
*December 14, 2010*

**Chemistry**

How many grams of nitrogen monoxide gas can be produced from 80.0 ml of 4.00 M HNO3 and excess Cu? 3Cu(s)+ 8Hno3(aq)-> 3Cu(NO3)2(aq)+4H2O(/)+2NO(g)
*December 14, 2010*

**Chemistry**

Element M(a solid) reacts with an aqueous solution of compound B to form an aqueous solution of compound C(a salt) and a gas composed of element D. When 1.000g of element M is reacted with excess oxgen 1.658g of the compound MO are formed. Compound B is binary, monoprotic acid...
*December 13, 2010*

**Chemistry**

Element M(a solid) reacts with an aqueous solution of compound B to form an aqueous solution of compound C(a salt) and a gas composed of element D. When 1.000g of element M is reacted with excess oxgen 1.658g of the compound MO are formed. Compound B is binary, monoprotic ...
*December 12, 2010*

**Chemistry**

Element M(a solid) reacts with an aqueous solution of compound B to form an aqueous solution of compound C(a salt) and a gas composed of element D. When 1.000g of element M is reacted with excess oxgen 1.658g of the compound MO are formed. Compound B is binary, monoprotic acid...
*December 12, 2010*

**algebra**

4. Write an equation for the line through the points (2, -6) and (-1, -4).
*December 9, 2010*

**Chemistry**

Co-precipitation is the process by which undesirable materials are "carried down" and trapped on the suface or within the desired precitate. The precipitate is washed with distilled water to remove the co-precipitates which are more soluble that the precipitate. Care...
*December 8, 2010*

**algebra**

P(1, 3) and R(5, 5) are the endpoints of a diagonal of the rectangle PQRS. Which sides of the rectangle are parallel to the x-axis? To the y-axis? What is the perimeter of the rectangle?
*December 7, 2010*

**Chemistry**

Co-precipitation is the process by which undesirable materials are "carried down" and trapped on the suface or within the desired precitate. The precipitate is washed with distilled water to remove the co-precipitates which are more soluble that the precipitate. ...
*December 7, 2010*

**chemistry**

Co-precipitation is the process by which undesirable materials are "carried down" and trapped on the suface or within the desired precitate. The precipitate is washed with distilled water to remove the co-precipitates which are more soluble that the precipitate. Care...
*December 7, 2010*

**Chemistry**

When 50.0 g of iron(3)nitrate, FE(NO3)3, is dissolved in water , the number of nitrate ions present in the solution is
*December 6, 2010*

**social studies**

What does this quote mean? “Why should the Indian be expected to plant corn, fence lands, build houses, or do anything but get food from day to day, when experience has taught him that the product of his labor will be seized by the white man to-morrow? The most ...
*December 1, 2010*

**economics**

What were greenbacks?
*November 29, 2010*

**Physics**

Earthquakes are essentially sound waves travelling through the earth. They are called seismic waves. Because the earth is solid, it can support both longitudinal and transverse sismic waves, which travel at different speeds. The speed of longitudinal waves, called P waves, is ...
*November 23, 2010*

**Physics**

i got the same answers you got but they are being read a sincorrect in my assignment.
*November 23, 2010*

**Physics**

The wave is travelling to the right at 50.0 m/s. What is the amplitude if the maximum displacement is 38.0 cm and the total distance travelled by the wave is 16.0 m. 2) What is the wavelength of the wave? 3)What is the frequency of the wave?
*November 23, 2010*

**Chemistry**

During the combustion of 5.00 g of octane, C8H18, 239.5 kcal is released. a) What is the sign of (delta)H for this reaction? b) How much energy is released by the combustion of 1.00 mol of C8H18
*November 15, 2010*

**physical chemistry**

For the process CH4(g) = C(s) + 2H2(g) A reaction is started in a rigid vessel at 1000 K with 1 mole of methane and 1 mole of hydrogen gas at 10 bar. Use table C.3 from your text to determine how many grams of carbon should be formed after the reaction has reached equilibrium.
*November 12, 2010*

**calculus**

Find the derivative of y=t^2(5t-8)^4.
*October 19, 2010*

**math**

Calculate the lower quartile (QL) in the following data set: (8, 6, 13, 8, 3, 15, 12, 5).
*October 15, 2010*

**Chemistry**

Ok I will try Kelvin. Thank you
*September 26, 2010*

**Chemistry**

I attempted using the Clausius-Clapeyron Equation and I am not getting anywhere
*September 26, 2010*

**Chemistry**

The vapor pressure of liquid chloroform, CHCl3, is 400.0 torr at 24.1 degrees Celsius and 100.0 torr at -6.3 degrees Celsius. What is delta Hvap of chloroform?
*September 26, 2010*

**Statistics**

Is the water on your airline flight safe to drink? It is not feasible to analyze the water on every flight, so sampling is necessary. In August and September 2004 the EPA found bacterial contamination in water samples from the lavatories and gallery water taps on 20 of 158 ...
*September 19, 2010*

**chemistry**

d,Atomic mass= fraction of the isotope X mass of the isotope.
*September 6, 2010*

**Statistics**

Calculate each binomial probability: a. Fewer than 4 successes in 12 trials with a 10 percent chance of success. b. At least 3 successes in 7 trials with a 40 percent chance of success. c. At most 9 successes in 14 trials with a 60 percent chance of success. d. More than 10 ...
*August 29, 2010*

**college**

Many organizational situations involve an audience that consists of a group of people. Which is an approach to analyzing this type of audience?
*August 10, 2010*

**chemistry**

Tums is added to 30.0 of 0.400m of HCL , how many grams of CO2gas are produced?
*July 20, 2010*

**Physics**

a ball is thrown vertically upward from the ground with the velocity of 30m/s. a) how long will it take to rise to its highest poitn? b) how high does the ball rise? c) how long after projection will the ball have a velocity of 10m/s? d) what is the total time of flight?
*July 19, 2010*

**Physics**

U=0,t=T,
*June 8, 2010*

**math**

square root 4y=10
*June 1, 2010*

**Vector**

2. Determine the Cartesian equation of the plane passing through the point P(2, -1,2) and containing the line r = (2, -1, 4) + f(0, 3, -5).
*June 1, 2010*

**Bikini Bottom**

huh? you are? What am I then?
*June 1, 2010*

**math**

How can fishermen save gas?
*May 31, 2010*

**Vector**

The points U(4,-1,2), V(-1,-1,-1) and W(-4,2,4) dermine a triangle in R^3 a) Determine the parametric equations for thr three lines containing the 3 sides of the triangle
*May 31, 2010*

**psychology**

all of the following are true of gestalt therapy except
*May 2, 2010*

**Politics iran**

Thank you and enjoy your trip :). I read your post about it.
*April 27, 2010*

**Politics iran**

Is this correct? The political values of Iran are influened by shari'a law? In other words Islamic law?
*April 27, 2010*

**History (social oppression)**

I'm having trouble understanding what social oppression is. Can it be applied to poor hating on other poors?
*April 26, 2010*

**hmm...?**

A clinic is a place where clients or patients receive diagnosis and treatment. So, a clinical psychiatrist is a psychiatrist involved in diagnosis and treatment of people with psychological challenges. Compare this to the theoretical psychologist and professor of psychology, ...
*February 23, 2010*

**math**

The unit rate for the first one is 98 yd/sec. 30 ounces for $3.48 is S8.62/oz. It is the best buy.
*February 11, 2010*

**math**

Which can be simplified to 13:4.
*February 11, 2010*

**math**

5/4*61/8 =305/32 =9.53125
*February 11, 2010*

**Computers**

Thanks, that was imformative.
*February 11, 2010*

**Computers**

This may seem irrelevant, but why is this site so oddly named?
*February 11, 2010*

**4th grade math**

9 miles long.
*February 11, 2010*

**programming**

java, write a program that prints out the letter X composed of asterisks (*) reply soon
*February 4, 2010*

**math**

How would I round the number 226,542,203 to the nearest million
*January 12, 2010*

**chemistry**

im confused about ionic substances. can someone give me a example of ionic substances?
*December 9, 2009*

**chemistry**

can someone explain a diatomic molecule, monatomic gas and what would happen if a metal atom bond with a nonmetal atom?
*November 23, 2009*

**Algebra**

Why is television called a communications medium?
*November 8, 2009*

**social studies**

do you know any websites that have any primary sources dealing with the roman empire, such as religion, war and conflict, culture, etc?
*November 1, 2009*

**Calc**

Thank you!
*October 26, 2009*

**Calc**

For y sec(x) = 3x tan(y), the direction above it says "Regard y as the independent variable and x as the dependent variable and use implicit differentiation to find dx/dy." I do now know if that makes any different and I believe I have 4 lives left. For the x3 + y3= ...
*October 26, 2009*

**Calc**

Thank you! For y sec(x) = 3x tan(y) I got dy/dx = (3 tan(y) - y tan(x)sec(x)) / (sec(x) - 3x sec²(y)) but it was still incorrect... I have no idea how to do y = arctan[(sqrt((1 + x)/(1 - x)))] because i never did this type of problem before, help please. here is another ...
*October 26, 2009*

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