Saturday
December 3, 2016

# Posts by Erin

Total # Posts: 670

chemistry
I am given the concentration of HClO4 and a pressure for H2... how do i plug either of the givens into the equation youve shown??
June 18, 2012

chemistry
calculate the reduction potential for hydrogen ion in a system having a perchloric acid concentration of 2.00 x 10^-4 M and a hydrogen pressure of 2.50 atm.
June 18, 2012

chemistry
will fe3+ oxidize Sn2+ to Sn4+ in acidic solution?
June 18, 2012

chemistry
the time is supposed to be 4.6 hours. i am not having problems getting the mass of Cu, i am just struggling with how to find how long it will take.
June 18, 2012

chemistry
i get 4.76 x 10^-5 mol CaC2o4.. squaring the answer gives me a ksp= 2 x 10^-9 is this right?
June 10, 2012

chemistry
a liter of a solution saturated at 25C with CaC2O4 is evaporated to dryness giving a 0.0061 gm residue of CaC2O4. Calculate the concentrations of the ions, and the molar solubility and the solubility product constant for this salt at 25C. Show the balanced reaction.
June 10, 2012

Elementary Statistics
1) Construct a confidence interval of the population proportion at the given level of confidence. x=60,n=300, 99% confidence. The 99% confidence interval is (_,_) 2) A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size sample ...
June 6, 2012

World History
Who ruled the Byzantine Empire?
May 29, 2012

Chemistry
Ammonia reacts with oxygen at 120 C to form NO and H20 in a sealed 40-L container. When 34 g of ammonia reacts with 96 g of oxygen, what is the partial pressure of the NO? What is the total pressure?
May 20, 2012

English
Well, Jacob, the deal is that this student is obviously enrolled in a K12, Inc school, and therefore, has a teacher who she could've contacted. Many times, the answers that students get from these sites are TOTALLY off. I'd rather the student come to a teacher (like me...
May 13, 2012

English
Thank you, Writeacher! This question comes from online schools affiliated with K12. I am constantly finding students who use these sites to copy answers. Liz, did you ever think of reading the lessons the school provides or of contacting your instructor?
May 13, 2012

Math
What is the x-coordinate of the image of P(5,11) under R-0,90*-?
April 15, 2012

Math
What are the coordinates of the image of the point P(4,25) under R-o, 180*-, where O is the origin?
April 15, 2012

Math
Consider the points P(20, 20), X(a,b) and Y(a+20, b+20). Is Y=T-op-(X), where Ois the origin. explain
April 15, 2012

Math
Find the image of the point P(-11, -34) after 6 successive half turns about the point C(-11, 0)
April 15, 2012

Math
The image of the point P(-38, 127) when reflected over the line y=x is...
April 15, 2012

Trig
i dot geht thhis werlk? cahn sumwone elp meh?
April 5, 2012

Chemistry
31 mL benzoate and 69 mL benzoic acid
March 29, 2012

Physics
A bullet of mass 0.06kg is fired horizontally with a muzzle speed of 700 m/s into a pendulums hanging block of mass 2.0kg. The block and the bullet then move up a height, h, above the pendulums equilibrium position. What is the speed of the bullet/block combination after the ...
March 15, 2012

algebra..
Thank you so much !
March 13, 2012

algebra..
Write an aquation in standad form that satisfies the given conditions: Paralled to the x-axis and through ( 4, -1)
March 13, 2012

chemistry
How do you do the hybridization of CBr4?
March 5, 2012

physical science
In raising a 5000-N piano with a pulley system, the movers note that, for every 2m of rope pulled down, the piano rises 0.3m. Ideally, show that the force required to lift the piano is 500-N.
February 28, 2012

Algebra
You operate a gaming Web site, where users must pay a small fee to log on. When you charged \$3 the demand was 520 log-ons per month. When you lowered the price to \$2.50, the demand increased to 780 log-ons per month. (a) Construct a linear demand function for your Web site and...
February 21, 2012

Algebra 2
You are cooking chili. When you take it off the stove, it has a temperature of 205°F. The room temperature is 68°F and the cooling rate of the chili is r = 0.03. How long will it take to cool to a serving temperature of 95°F
February 20, 2012

Math
1 bounce=32 2 bounce=16 3 bounce=8 4 bounce=4 5 bounce=2 6 bbounce=1
February 20, 2012

English
When there is change in reactant, product, or temperature the equilibrium position will shift in a direction that tends to decrease change in this situation. When the concentration of one of the products of an equilibrium reaction is higher than the other, then the solution ...
February 20, 2012

physics 213
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 44.7 km/s and 56.2 km/s. The slower planet's orbital period is 8.61 years. (a) What is the mass of the star? (b) What ...
February 19, 2012

math 12
The world's population is 1970 was about 3.6 billion. If the population has increased at 2% each year since then, what will the world's population be in 2010?
February 14, 2012

physics 213
A duck has a mass of 2.80 kg. As the duck paddles, a force of 0.120 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.190 N in a direction of 48.0 ° south of east. When these forces begin to act, the velocity of the duck is 0....
February 3, 2012

physics
During a circus performance, a 74.8-kg human cannonball is shot out of a 18.0-m-long cannon. If the human cannonball spends 0.844 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.
February 1, 2012

Pre-Algebra
Help! I am not really good with story problems! Forest rangers measure a depth of 82" of snow on a mountain peak at 8am. Snow is expected to fall at a steady rate of 3/4" per hour throughout the day. A) write an equation that approximates the depth of 'y' of ...
January 30, 2012

physics
In the javelin throw at a track-and-field event, the javelin is launched at a speed of 35.0 m/s at an angle of 33.7 ° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is ...
January 26, 2012

Physics
Relative to the ground, a car has a velocity of 14.8 m/s, directed due north. Relative to this car, a truck has a velocity of 24.0 m/s, directed 52.0° north of east. What is the magnitude of the truck's velocity relative to the ground?
January 26, 2012

Math
What is the range of y= -(x-2)^2+2 ?
December 31, 2011

english
What do you know about the fact? I have to write a research paper about Genocide. It must have a body and conclusion
December 19, 2011

math
16b to the 8th power + 40b to the 7th power + 25b to the 6th power
December 14, 2011

science
Why are proteins necessary in your body? What are polymers that build up to make proteins?
December 9, 2011

Algebra 2
How would you graphy this question and also solve for the intercepts: y=2(x-3)^2-1
December 2, 2011

science-biology
it is a recessive gene
December 2, 2011

Physics 12
An alpha particle is accelerated by a voltage of 1.53*10^3 V and is then deflected by a magnetic field of strength 0.020 T into a circular path of radius 0.40 m. If the alpha particles have a charge of 3.2*10^-19 C, what is their mass?
December 1, 2011

chemistry
how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?
November 29, 2011

biotech
how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?
November 29, 2011

Calculus
That is wrong^ av=11-2/3= 9/3=3
November 13, 2011

college math
use long division 1.2x3+3x2-17x+1 /x-2 2.y3+3y2+1 /y-2 3.n5-n2 /n2-n
November 11, 2011

7th Math
add 12 16 and 18. then find the LCD of 3/4 and 1/2. the LCD would be 4. hope this helps!
October 27, 2011

Math :(
jerome and tyler meet in the local pizza parlor after their saturday afternoon soccer game. Eash boy bought a separete pizza with an agreement to share with each other, both at the restraunt and in what they would each take home. jerome ate 1/4 of a pizza and Tyler at 2/3 of a...
October 27, 2011

English
Lord of the Flies Question Describe how the boys have fun as explorers. (p. 25-26) Who becomes the chief and how is this determined?
October 25, 2011

English
Lord of the Flies Questions 3.)What does Piggy believe has happened back home in England? 4.What does Piggy want to do now that they're on the island? 7.What happened when the conch was blown? (p. 17)
October 25, 2011

Spanish
The problem is: Que talla usar/usara/usaro Pedro? Does usar get affected by the subject or any ol noun?
October 23, 2011

Physics
Physics Help... Applying Newtons Laws Grade 11? On the surface of the earth a geological hammer has a mass of 1500g. Determine its mass and weight on Mars where g=3.6 m/s^2.
October 22, 2011

Physics
A 10 m long frictionless ramp is inclined at an angle of 30 degress to the horizontal. A boy of mass 57 kg coasts down the incline on a skateboard of mass 3.0 kg. The acceleration due to gravity may be taken as 9.8 m/s^2 and the effects of air resistance can be ignored. a) ...
October 22, 2011

Science
In drosophila , short wings , and black colour are reccessive traits.long wings and grey colour are dominant. show the cross results between a short winged , heterozygous grey fly and a heterzygous long winged grey fly
October 17, 2011

determine the maximum or the minimum of a)2x^2+12x
October 17, 2011

The profit p(x) of a cosmetics company , in thousands of dollars . is given by p(x) =-5t^2=400x-2550, where x is the amount spent on advertising in thousands of dollars a) determine the maximum profit the company can make b) dtermine the amount spent on advertising that will ...
October 17, 2011

The height of a ball thrown vertically upward from a rooftop is modelled by h(t)=-5t^2=20t=50, where h(t) is the ball's height above the gorund,in meters, at time t seconds after the throw a) determine the maximum height of the ball b) how long does it take for the ball to...
October 17, 2011

geometry
Suppose the parallelogram shown has angles defined by the following expressions: angle A = 6x + 19; angle B = 3x - 21; angle C = 6x + 19; and angle D = 3x - 21? What is the measure of the largest angle?
October 16, 2011

Art Appreciation
ok thank you
October 16, 2011

Art Appreciation
I do not understand it.
October 16, 2011

Art Appreciation
Visit the following Web sites and explore the collections of Ancient Art there: The Metropolitan Museum of Art The Louvre Museum The Smithsonian Institution Freer Gallery and Sackler Gallery See the Course Materials List for access to these sites. From the gallery Web sites ...
October 16, 2011

geometry
Suppose the parallelogram shown has angles defined by the following expressions: angle A = 6x + 19; angle B = 3x - 21; angle C = 6x + 19; and angle D = 3x - 21? What is the measure of the largest angle?
October 16, 2011

chemistry
A student found that there are 115 drops of glacial acetic acid in 2.00 mL. Calculate the number of drops of glacial acetic acid, HC2H3O2 required to make 225 mL of 0.1 M acetic acid solution
October 16, 2011

determine the maximum or the minimum value for each a)y=2x^2+12 b)y=-3x^2-12x+15 c)3x(x-2)+5
October 16, 2011

give the two possible alleles in the eggs produced by a women whose genotype is JjKkLl
October 14, 2011

Math ( any help would be great!)
a ball is kicked in the air from the top of a cliff , the path that the ball travels is given by the equation h(t)=-5t^2+17t+22, where h(t) is the height given in meters and t is the time seconds. a) how high is the cliff ? b)what is the maximum height the ball reaches ? c)...
October 13, 2011

Physics
two students are attempting to lift a sign to the top of a tall building, each is pulling equally with 100 newtons of force, on the two ropes. The ropes are attached to opposit corners of the sign, and the angle between them is 60. compute the resultant force.
October 13, 2011

ALGEBRA 1 HONORS
im suppose to find the slope and y-intercept.
October 11, 2011

ALGEBRA 1 HONORS
October 11, 2011

Physics
A passenger walks from one side of a ferry to the other as it approaches a dock. If the passenger's velocity is 1.50 m/s due north relative to the ferry, and 4.50 m/s at an angle of 30.0* west of north relative to the water, what are the direction and magnitude of the ...
October 2, 2011

physics
There are two blocks connected by a string and tied to a wall on an incline. The mass of the lower block is 1.0kg; the mass of the upper block is 2.0kg. Given that the angle of the incline is 31*, find the tension in (a) the string connecting the two blocks and (b) the string ...
October 2, 2011

physics
As you hurry to catch your flight at the airport, you encounter a moving walkway that is 85m long and has a speed of 2.2 m/s relative to the ground. If it takes you 68s to cover 85m when walking on the ground, how long will it take you to cover the same distance on the walkway...
October 2, 2011

Physics
You shoot an arrow into the air. 2.oo seconds later the arrow has gone straight upward to a height of 30 meters above its launch point. (a) What was the arrow's initial speed? (b) How long did it take for the arrow to first reach a height of 15 meters above it's launch...
October 1, 2011

physics
An Astronaut on the Moon drops a rock straight downward from a height of 1.25 meters. If the acceleration of gravity on the Moon is 1.62 meters per second squared, what is the speed of the rock just before it lands?
October 1, 2011

college math
please help me write the equation and solve for it. 1).in a basketball game, eric made half as many free throws as dan. if the total number of free throws made by both men was 18, how many free theows did eric make?
September 27, 2011

how can granite and slate peices be held together?
September 22, 2011

no im in 6th writeacher u r rong. i just got done w/ that i will help u in a minute
September 22, 2011

physics
A helicopter is rising at 5 m/s when a bag is dropped. After 2 seconds what is the bag's velocity? what is the bag's position? and how far below the helicopter is the bag?
September 21, 2011

college math
write the decimal as a fraction or a mixed number. write your answer in simplest form. .3282 so far i got this, 3282/100,000 then simplified to 1641/50,000
September 9, 2011

Physics
what is the volume of an object whos density is 2.2 g/cm^3 and has a mass of 50 g?
September 5, 2011

physics
A car moving with a constant acceleration covers the distance between two points 80 m apart in 8.0 s. Its velocity as it passes the second point is 14 m/s. (a) What was the speed at the first point? 1 m/s (b) What is the constant acceleration? 2 m/s2 (c) How far behind the ...
September 2, 2011

Mathematics
"Write the unit rate as a fraction" "25 feet per second" How do you solve this?
August 29, 2011

anatomy
Voluntary actions are controlled within the _________ of the frontal lobe
July 26, 2011

Algebra
Determine the approximate maximum distance y=-0.01x2 +0.7x+6.1
June 20, 2011

math
Write a linear function that satisfies the given conditions: f(0)=12, F(3)= -2
May 22, 2011

Math
Write an equation of the line that is perpendicular to the line y=2x-1 and passes throgh the point (0,-3)
May 22, 2011

Algebra
How do i simplify this? [(3x+1)/(x-2)] + [(2x-1)/(x-2)]
May 22, 2011

Life orientation(Reaseach)
I have a human rights poster to complete and i need help.
May 21, 2011

geometry
the area of a trapezoid is 108 square inches and one of its bases has a length of 8 inches. If the height of the trapezoid is 1.5 feet,f ind the length of the other base in inches.
May 11, 2011

physics
A shiny metallic Christmas ball ornament 5.10 cm in diameter is used as a mirror. What is the mirror's focal length? please answer in cm. thanks.
May 7, 2011

Math
I really need a math dictionary... I need the following definitions Please: point line intersecting lines parallel lines vertical lines horizontal lines acute angle obtuse angle right angle square rectangle trapezoid rhombus pentagon hexagon octagon triangle circle chord ...
May 3, 2011

Math
But when i search a word I didn't understand what it meant. Can anyone help me find a GOOD math dictionary?
May 3, 2011

Math
Thanks Ms.Sue!! It has been a LONG time since I posted!!
May 3, 2011

Math
I need the following definitions Please: point line intersecting lines parallel lines vertical lines horizontal lines acute angle obtuse angle right angle square rectangle trapezoid rhombus pentagon hexagon octagon triangle circle chord radius diameter cube rectangular prism ...
May 3, 2011

science
What mass of water, in grams, would have to be decomposed to produce 26.3 L of molecular oxygen at STP?
May 3, 2011

physics
Two children are having a splashing competition using a diving board. The first child is very small and jumps lightly off the end of the diving board. The second child, who is much larger, jumps heavily off the board. A. In what way or ways, if any, are the vibrations of the ...
April 28, 2011

Geology
The Love of Christ
April 20, 2011

Language Arts
Well actually, why wouldn't there be a comma after the yes? Why is there one after squeaky?
April 13, 2011

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