Sunday
December 21, 2014

Posts by Anne


Total # Posts: 621

Chemistry
Calculate the volume of water, in milliliters, that would be displaced by a piece of gold weighing 18.2g.
September 12, 2012

Chemistry
Calculate the volume of water, in milliliters, that would be displaced by a piece of gold weighing 18.2g.
September 12, 2012

Chemistry
Calculate the volume of water, in milliliters, that would be displaced by a piece of gold weighing 18.2g.
September 12, 2012

Math
The car in the figure below travels a distance of 745 m along the track, and the driver finds that she has traveled through an angle of 475°. What is the radius of the track?
September 6, 2012

Physics
The car in the figure below travels a distance of 745 m along the track, and the driver finds that she has traveled through an angle of 475°. What is the radius of the track?
September 6, 2012

Chemistry (quick clarification please?)
Is 50 ml of a 50 mM solution of NaCl the same concentration as 100 ml of a 100 mM solution of NaCl?
September 5, 2012

College Biology help!
Is this true? Explain. To make a 100 osmolar solution of magnesium chloride, 60g of the salt are placed in a liter of water.
September 5, 2012

algebra
3x/y - 5
September 3, 2012

Calculus
TWO examples of each of the following: two sided limits and theorem on limits (SUM, difference, product, quotient, nth root, ).
August 29, 2012

Algebra
Hi! Just want to ask if 1/x-1 - x/x-1 equal to 1? That is what I got when I solved it. Thanks.
August 13, 2012

Algebra
(a^2 - 4a)/(a^2-a-6) minus (a-6)/a^2-a-6)
August 13, 2012

Algebra
Kindly solve this and give its restriction. (5-xy)/(9z) - (14+8xy)/(9z)
August 13, 2012

Algebra
Simplify the rational expression and write the restriction for the simplified rational expression. x^3 - 8 ----------------------- x^2 + xy - 2x - 2y
August 5, 2012

Algebra
The perimeter of a heptagon is 9a^2s ft. The perimeter of a triangle is 6a^6b^2s ft. Find the ratio of the perimeter of the heptagon to the perimeter of the triangle.
August 5, 2012

AP World History
How did rum play a role in the American Revolution?
August 2, 2012

Math
A rectangular sandbox has a length of 60 inches, a width of 40 inches, and a depth of 6 inches. What is the volume in cubic inches?
August 2, 2012

chemistry
What does 1.5 fold dilution and 2.5 fold dilution mean?
July 26, 2012

Math
I just did.. Thanks! Was it 3665?
June 21, 2012

Math
Oh, sorry. It was 2, not 3 ..
June 21, 2012

Math
i am a four digit numeral number between  3000 and 4000.My ones digit is 3 greater than my thousands digit.The two other digits are the same.If the sum of my digit is 20,what number am i?
June 21, 2012

Math
I am number greater than 70 000 but less than 90 000.My ones digit is the only even prime number.My tens digit id the same as my ones digit.My ten thousands digit is four times my ones digits.Both my hundreds and thousands digits are half the ten thousands digits.What number ...
June 6, 2012

Math
What is the least number that can be formed using 4 9 2 1 3 0 6?
June 6, 2012

Math
I am number greater than 70 000 but less than 90 000.My ones digit is the only even prime number.My tens digit id the same as my ones digit.My ten thousands digit is four times my ones digits.Both my hundreds and thousands digits are half the ten thousands digits.What number ...
June 6, 2012

Math
What is the greatest 7 digit number without repeating any digit?
June 6, 2012

Math
i am a 4 digit number between 3000 and 4000.My ones digit is twice my thousands digit.My hundreds digit is the same as my ones digit and my tens digit is one less than the hundreds digit.If the sum of my digit is twenty,what number am i?
June 5, 2012

GEOMETRY
Length of the diameter of a circle with the endpoints A(4, -3) and B(4, 3)
May 30, 2012

Chemistry
I have liquid concentrated HCl (37%w/w) To prepare 100ml of 10g/L HCl as a solvent medium, is it acceptable to just weigh 1g of liquid conc HCl and dilute to 100ml with water? What volume of conc HCl should we use to make 100ml of 10g/L HCl?
May 28, 2012

writing
Write a journal entry describing a day in the life of a snake in the wild from the snake's point of view. At least 5 sentences
May 17, 2012

English
would "the only heroic thing is the sky" be personification?
May 17, 2012

Math :(
Great answer and great way to explain. I would do the same thing. This is easy for me
April 30, 2012

Math riddle
122
April 26, 2012

Accounting
Please prepare the following journal entries. Indicate which account should be debited and which account should be credited along with the dollar amount of the debit and credit. a) Investors invested $100,000 in exchange for 10,000 shares of common stock. b) Company paid a ...
April 19, 2012

Chemistry
A 1.00-L solution saturated at 25°C with calcium oxalate (CaC2O4) contains 0.0061 g of CaC2O4. The solubility constant (Ksp) for this salt is [CaC2O4=128.09 g/mol]
April 16, 2012

Chemistry
How would you find the pH of a solution prepared by mixing 50 mL of 0.125 M KOH with o.050 L of 0.125 M HCl?
April 16, 2012

physics 2
A concave mirror has a focal length of 27.0 cm. The distance between an object and its image is 46.5 cm. Find the object and image distances, assuming the following. (a) that the object lies beyond the center of curvature do = di = (b) that the object lies within the focal ...
April 10, 2012

hca/210
examples of position in healthcare for the four functions of management
April 9, 2012

Physics 2
The average intensity of light emerging from a polarizing sheet is 0.807 W/m2, and the average intensity of the horizontally polarized light incident on the sheet is 0.972 W/m2. Determine the angle that the transmission axis of the polarizing sheet makes with the horizontal.
April 5, 2012

math
The average of two numbers is 34. The first number is three times the second number. what are the two numbers?
April 1, 2012

Math
Jillian must average at least 90 on two quiz scores before she can move to the next skill level. Jillian got a 92 on her first quiz. What scores could Jillian get on her second quiz in order to move to the next skill level? How could I answer this is an two-step inequality form?
March 27, 2012

Physics
A 30.0 kg box is being pulled across a carpeted floor by a horizontal force of 230 N., against a friction force of 210 N. Calculate the acceleration of the box and find the x and y components of the acceleration of the box. Align the positive direction with the normal force ...
March 26, 2012

Physics
Thanks! I did get this far, but it didn't seem right!
March 26, 2012

Physics
A loud speaker of mass 24.0 kg is suspended a distance of h = 2.00 m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of 3.50 m. What is the tension in each of the cables?
March 26, 2012

Science
What does a thermohygrometer do?
March 25, 2012

Chemistry
How long can we use a bottle containing anti-bumping granules? Can it be used indefinitely?
March 23, 2012

Chemistry
I know that it's made up of one molecule from fructose and one molecule from glucose. i think it has a 12 Carbon atom ring... but that's really all I know
March 22, 2012

Chemistry
Can you label all the functional groups of the Sucrose Molecule?
March 22, 2012

Probability
Six marbles are chosen without replacement from a box containing 10 red, 8 blue, and 3 yellow marbles. Let X be the number of blue marbles chosen. a) Find the probability distribution of X. b) Find the mean of the random variable X
March 22, 2012

Probability
7) Suppose that you roll a pair of standard 6-sided dice a total of 42 times. What is the probability that you will get a sum of 5 at least four times?
March 22, 2012

Chemistry
What is the function of Compressed Air in GC-FID (i.e. Gas Chromatography-Flame Ionization Detector)?
March 18, 2012

Science-Chemistry
In the following test for Sulfated Ash, ammonium carbonate solution was added. What is the purpose of adding ammonium carbonate solution? Heat a silica crucible to redness for 30 minutes, allow to cool in a desiccator and weigh. Place 1g of the substance in the crucible and ...
March 18, 2012

science
Who would have to overcome inertia to move the ball, a golfer or a soccer player?
March 15, 2012

Chemistry
during a molar volume of oxygen experiment indicate how each of the following errors would affect (increase, decrease, or no change) your calculated value for the molar volume of O2 at STP. 1.) Your sample was not completely decomposed. 2.) After you finish heating sample & ...
March 3, 2012

physics
A balloon rubbed against denim gains a charge of -9 µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 5 cm.
March 1, 2012

physics
Two electrostatic point charges of 83 µC and 50 µC exert a repulsive force on each other of 175 N. What is the distance between the two charges?
March 1, 2012

Pre-Cal
Convert the given exponential function to the form indicated. Round all coefficients to four significant digits. f(x) = 9e^3x; f(x) = Ab^x How do i solve the equation with this formula? Thanks
February 29, 2012

math
Solve variation problem if m varies jointly as z and p, and m=10 when z=2 and p=7.5, find m when z=5 and p=7
February 24, 2012

Physics 2
A cylindrical copper cable carries a current of 1170 A. There is a potential difference of 1.60 10-2 V between two points on the cable that are 0.21 m apart. What is the radius of the cable?
February 16, 2012

Physics 2
A(n) 78-Ù resistor and a 68-Ù resistor are connected in series across a battery. The voltage across the 78-Ù resistor is 25 V. What is the voltage across the 68-Ù resistor?
February 16, 2012

potential
What is the potential halfway between two point charges spaced 1 mm apart if q1=10 micro coulumbs and q2= -5 micro coulumbs?
February 16, 2012

electric fields
In an electic field described by E=(20i+60j) V/m, calculate the change in potential for a particle that moves from the origin to the coordinate (3,3) m?
February 16, 2012

Physics
A conducting hollow sphere of radius. 2m and charge 20 micro coulumbs. What is the potential of the sphere at a distance r from the center if: A)r= .1m? b)r= .2m? c) r=.3m?
February 16, 2012

Physics
You've got a conducting hollow sphere of rradius 0.2 m and a charge of 20 micro culumbs. What is the potential of the sphere at distance r from the center if : r=0.1 m? r=0.2 m? r=0.3 m?
February 15, 2012

emily
But v= k int. (Dq/r).....?
February 15, 2012

gender
Women not being allowed into the seals
February 15, 2012

Calculus (Integrals)
Actually none of the above
February 15, 2012

Calculus (Integrals)
56
February 15, 2012

Chemistry-help
Posted by anne on Wednesday, February 15, 2012 at 3:20pm. How to prepare 1L of 96% v/v ethanol from 99% v/v ethanol? Can you show me the calculation steps?Thanks.
February 15, 2012

Chemistry
How to prepare 1L of 96% v/v ethanol from 99% v/v ethanol? Can you show me the calculation steps?Thanks.
February 15, 2012

Physics 2
The wire in the figure below carries a current of 12 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 30 A. Use Ampère's law to find the magnitude of the magnetic field at a distance of r = 0.72 m from...
February 13, 2012

Physics 2
The drawing shows four insulated wires overlapping one another, forming a square with 0.050-m sides. All four wires are much longer than the sides of the square. The net magnetic field at the center of the square is 91.5 µT. Calculate the current I.
February 12, 2012

Physics
A horizontal wire of length 0.48 m, carrying a current of 6.8 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force. When the wire is tilted upward at an angle of 19° it experiences a magnetic force of 4.00 10-3 N...
February 12, 2012

Chemistry
wats Kf and kb
February 9, 2012

Math
Gymnast Clothing manufactures expensive hockey jerseys for sale to college bookstores in runs of up to 250. Its cost (in dollars) for a run of x hockey jerseys is C(x) = 2500 + 10x + 0.2^x2(0 ≤ x ≤ 250) Gymnast Clothing sells the jerseys at $105 each. Find the ...
February 9, 2012

Math
The associated exponential model for the value of a deposit after t years is A(t) = 7000(1 + (0.0394/12))^12t. At the start of which year will an investment of $7,000 made at the beginning of 2007 first exceed $11,000? (Round your answer the nearest whole number.) I don't ...
February 9, 2012

Physics
A capacitor is constructed of two concentric conducting cylindrical shells. The radius of the inner cylindrical shell is 2.35 10-3 m, and that of the outer shell is 2.49 10-3 m. When the cylinders carry equal and opposite charges of magnitude 1.61 10-10 C, the electric field ...
February 1, 2012

Physics
An electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive plate (see the drawing). The plates are separated by a distance of 1.4 cm, and the electric field within the capacitor has a magnitude of 3.5 106 V/m. What is ...
February 1, 2012

Chemistry - thanks
In a thin layer chromatography (TLC)experiment,the TLC plate was pre-developed in the development chamber containing the mobile phase (to remove any contaminants before use),then air dried. On the same day,the TLC plate was then spotted with the sample & standard and placed in...
January 31, 2012

Chemistry-help needed
I have a question on thin layer chromatography (TLC). My mobile phase (i.e. developing solvent) is a mixture of 2 non-polar solvents. After preparing the mobile phase, is it necessary to pour some into the developing chamber to saturate the chamber or should we only pour the ...
January 31, 2012

Algebra
I have 100 feet to surround three sides of a rectangle. What is the largest area that I can enclose?
January 30, 2012

Physics
Three point charges, -6.35 10-9 C, -8.20 10-9 C, and +7.75 10-9 C, are fixed at different positions on a circle. The total electric potential at the center of the circle is -2210 V. What is the radius of the circle?
January 30, 2012

Physics
The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = -7.00 10-9 C placed at corner A and then at corner B.
January 30, 2012

Physics
Two point charges are fixed on the y axis: a negative point charge q1 = -26 µC at y1 = +0.21 m and a positive point charge q2 at y2 = +0.38 m. A third point charge q = +8.5 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other ...
January 24, 2012

Physics
Two point charges are fixed on the y axis: a negative point charge q1 = -26 µC at y1 = +0.21 m and a positive point charge q2 at y2 = +0.38 m. A third point charge q = +8.5 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other ...
January 23, 2012

Physics
Two charges, -15 and +4.5 µC, are fixed in place and separated by 2.8 m. At what spot along a line through the charges is the net electric field zero? What would be the force on a charge of +1 µC placed at this spot?
January 23, 2012

Science
"When Environmental Hazards happen, what should you do?"?
January 20, 2012

Chemistry-please help
Please show me the calculation steps. How do I prepare 10%w/w Hydrochloric acid from 37%w/w Hydrochloric acid? The density of 37%w/w HCl is 1.19g/ml. Thank you.
January 19, 2012

Chemistry
A foundry releases 6.0 U.S. tons of gas into the atmosphere every day. The gas mixture contains 2.5% sulfur dioxide (SO subscript 2) by weight. How many pounds of sulfur dioxide are released in one week? Show all work needed.
January 5, 2012

Chemistry
thanks for the help :)
December 13, 2011

Chemistry
A compound of the element A and oxygen has a mole ratio of A:O=2:3. If 8.0 grams of the oxide contains 2.4 grams of the oxygen, a. What is the atomic weight of A? b. What is the weight of one mole of the oxide? c. What theoretical weight of the oxide is formed when 28 grams ...
December 13, 2011

algebra
how do I solve F = 5/9 (F-32) ?
December 9, 2011

urgent math
sorry i forgot to put the problem. here it is: f(x)=4(x+5)^2-6
December 8, 2011

urgent math
without graphing, find the vertex, the azis of symemtry, and the maximum value or the minium value.
December 8, 2011

urgent math
complete the square to write each function in the form f(x)=a(x-h)^2+k f(x)=2x^2-20x-3
December 8, 2011

urgent math
find the equilibrium point for the demand and supply functions D(p)=79-8p and S(p)=37+6p, where p is the price, in dollars, D(p) is the number of units demanded, and S(p) is the number of units supplied.
December 8, 2011

pre calc
you are 7 miles N & 4 miles W of the cabin how do you get back to the cabin? Bearing?
December 7, 2011

Urgent math please help
find a quadratic function that fits the set of data points. (1,4), (-1.6), (-2,16) what did i do wrong, i got -2x^2-x+7
December 7, 2011

math please help
find all x-intercepts of the given function f. f(x)=3x+10ã(x) -8
December 7, 2011

9th grade math
simplify x^5-x^3+x^2-1-(x^3-1)(x+1)^2/(x^2-1)^2
December 7, 2011

math **urgent**
using 100 ft of fence material and building a regular octagon garden, what is the area of the garden?
December 5, 2011

Physics
A vertical spring with a spring constant of 400 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 2.7 cm in bringing the block to a momentary...
December 1, 2011

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