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April 18, 2015

Posts by Jess


Total # Posts: 878

Science
You have the same liquid it cannot change.
April 26, 2011

Chemistry
You forgot to enter any of your values... if you copied this from ALEKS it won't include them. You have to type them in.
April 15, 2011

chemistry
What would be the mass of a bag of anhydrous magnesium sulfate, MgSO4, if it contained the same amount of magnesium as a 1.00kg bag of Epsom salts, MgSO4 x 7H2O? Give your answer in grams. please help
April 11, 2011

chemistry
iron+sulphur together are a mixture of small grains yellow and dark grey.Its chemical symbol is 'Fe + S'.When it reacts with oxygen they create a new chemical substance; Iron Sulphide. What do you put for 'explain the reaction using the Big Idea of Energy? :S HELP xxx
April 10, 2011

physics urgent!!!
A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a component and ...
April 7, 2011

physics
A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a component and ...
April 7, 2011

physics
A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a component and ...
April 6, 2011

Microbiology
to solidify the media in order to obtain a pure colony
April 6, 2011

english
Which element of a short story would be most important to a story about a mad scientist stealing a secret weapon?
April 6, 2011

Chemistry
I have a question which asks... What is the Oxidation number of Nitrogen in Cu(NO3)2 I know the answer is 5+ but how do you get that?? Cu= 2+ O= 2- (Theres 3 of them so -2x3=-6...then, theres a two out of the brackets so 6- x 2 =-12) +2 - (-12)= -10? And then what? I think my ...
April 6, 2011

Chemistry
I have a question which asks... What is the Oxidation number of Nitrogen in Cu(NO3)2 I know the answer is 5+ but how do you get that?? Cu= 2+ O= 2- (Theres 3 of them so -2x3=-6...then, theres a two out of the brackets so 6- x 2 =-12) +2 - (-12)= -10? And then what? I think my ...
April 6, 2011

Chemistry
I have a question which asks... What is the Oxidation number of Nitrogen in Cu(NO3)2 I know the answer is 5+ but how do you get that?? Cu= 2+ O= 2- (Theres 3 of them so -2x3=-6...then, theres a two out of the brackets so 6- x 2 =-12) +2 - (-12)= -10? And then what? I think my ...
April 6, 2011

8th grade science
what contents in magma affects a volcanos explosive?
March 28, 2011

physics
at what altitude should a satellite be placed into circular orbit so that its orbital period is 48 hours? the mass of the earth is 5.976x10^24 kg and the radius of the eatrh is 6.378x10^6 m.
March 23, 2011

physics
a 1 kg mass is attached to a spring hanging vertically and hangs at rest in the equilibrium position. the spring constant of the spring is 1 n/cm. the mass is pulled downward 2 cm and released. what is the speed of the mass when it is 1 cm above the point from which it was ...
March 23, 2011

History
What aspects of Japanese culture were evident in samurai training?
March 23, 2011

Science
ANYONE?
March 14, 2011

Science
Sperm cells have very little cytoplasm, while egg cells have a lot of cytoplasm. How do these different structures support the different functions of eggs and sperm?
March 14, 2011

Chemistry
Can dimethylformamide be stored in plastic bottles? Or is it better to store in glass bottles?
March 13, 2011

chemisty
how many grams of magnesium sulfate are required to make 575 ml of a 1.65% (m/v) solution
March 7, 2011

History
How did Buddhism spread through Korea into Japan? Explain how Duddhism and Shinto blended together.
March 7, 2011

History
How would i word the answer though?
March 7, 2011

History
Where are China and Korea located in relationship to Japan? Why did this location allow for Japan to be influenced by many cultures at once?
March 7, 2011

Science
Does anyone have an answer?
March 4, 2011

Science
An animal has an allele for yellow eyes, but its eyes are grey. The allele for yellow eyes must be
March 4, 2011

Science
A person's height, eye color, and skin tone are all examples of?
March 4, 2011

Math
7 (x-2y) minus cubed
March 2, 2011

Math
Lisa bought two equal pieces of fabric. She will cut squares for a quilt from the fabric. All together Lisa bought 5 yards 1 foot of fabric. What is the length of each piece of fabric?
February 24, 2011

Math
I have 5 books. Each book weighs 1 kilogram 250 grams. How much is the total weight?
February 24, 2011

math
A rectangle has a perimeter of 24 and an area of 35 square feet. What is the length and width of the rectangle?
February 23, 2011

chemistry
How do you find Kc for an equilibrium problem?
February 20, 2011

Chemistry
what is an example of a substance that has both ionic &covalent bonds & where are these bonds formed.
February 13, 2011

chemistry
I keep thinking that 3 is the van't hoff factor for ammonium chloride, but I keep getting my answer wrong. Any ideas?
February 11, 2011

math
what percent of 1/4 is 2/5
February 10, 2011

Accounting ethics
I got some help to get started but the material still seems like a foreign language. Someone layed out a nice outline for me to follow, but without understanding the material I still can't get anywhere. It is how to CONDUCT a stakeholder analysis I am stuck on. The few ...
February 4, 2011

sociology
i have the same question that link doesn't help at all.
January 28, 2011

physics
During a particular thunderstorm, the electric potential difference between a cloud and the ground is Vcloud - Vground = 1.10 108 V, with the cloud being at the higher potential. What is the change in an electron's electric potential energy when the electron moves from the...
January 18, 2011

Chemistry
How many moles of HCl are present in a 50mL 3M solution of HCl?
January 12, 2011

Chemistry
How many moles of HCl are present in a 50mL 3M solution of HCl?
January 12, 2011

chemistry
if 5liters of hydrogen iodide gas is bubbled through 2 liters of 0.0275 M lead 2 nitrate solution at STP, how many grams of lead 2 iodide will precipitate out?
January 6, 2011

math
The points A (7,6) and B (2,1) are 3 units and 2 units respectively from the line L and are on the opposite sides of L. Find the coordinates of the point where the interval AB crosses the line L.
January 6, 2011

math
add
January 6, 2011

social studies
about how many peole went through ellis island?
January 5, 2011

8th grade science
when you bring your bicycle to a stop where does he kinetic energy it had go?
January 4, 2011

8th grade science
compare and contrast the effect of a catalyst on a chemical reaction with that of an inhibitor?
December 21, 2010

Chem
Determine mass of KCI created when react 35.7 g of K w/ unlimited amount of CI2
December 21, 2010

geometry
Triangle ABC has the following angle measures. Angle A = 44. Angle B = 4x. Angle C = 2x + 16. Find the measure of angle C.
December 16, 2010

Math Help in need of urgent assistance
A tower casts a 235-foot-long shadow. If the angle of elevation from the tip of the shadow to the top of the tower is 66.3°, how high is the tower? (Round your answer to one decimal place.)
December 13, 2010

high school physics static friction
The system shown below is in equilibrium. Using the fact that block A is placed on a table, has a normal force of 40.2 N and it is not moving, what is the coefficient of static friction on block A? I know you can't answer this but if you have any suggestions: Calculate the...
December 8, 2010

high school physics
I got that the acceleration is 5.6 meters per seconds sqaured because 308.7N/55kg. Therefore, the final velocity is 39.2 meters per second. IS THIS RIGHT? Thanks all for your help!
December 8, 2010

high school physics
Annie rides her snowboard down a hill sloped at 25 degrees. The coefficient of kinetic friction between her and her skies is .15. If her mass is 55 kg, hw fast is she excelerating? Assuming she starts from rest and the equation is v=v+a*t, what is her velocity after 7 seconds...
December 8, 2010

social studies
what is a veteran?
December 8, 2010

Math
is the indefinite integral of 4x^3sinx^4dx = -cosx^4+c
November 30, 2010

Math
Identify u and du for the integral. 1. The integral of [(cosx)/(sin^(2)x)]dx 2. The integral of sec2xtan2xdx
November 30, 2010

11th grade physics
Carl puts the pedal to the metal and increases her speed as follows: 0 mi/hr at 0 seconds; 10 mi/hr at 1 second; 20 mi/hr at 2 seconds; 30 mi/hr at 3 seconds; and 40 mi/hr at 4 seconds. What is the acceleration of Car;'s car?
November 29, 2010

11th grade physics
A car slows down from +32 m/s to +8 m/s in 4s. Calculate the acceleration .
November 29, 2010

physics
A crate of mass 32 kg is pushed up a frictionless ramp by a person as shown in the figure below. Calculate the work done by the person in pushing the crate a distance of 25 m as measured along the ramp. Assume the crate moves at a constant velocity.
November 21, 2010

Chemistry
A scuba diver creates a spherical bubble with a radius of 4.0cm at a depth of 30.0m where the total pressure (including atmospheric pressure) is 4.00 atm. What is the radius of the bubble when it reaches the surface of the water? (Assume atmospheric pressure to be 1.00atm and ...
November 20, 2010

Chem
the 4.0 is cm, depth is 30 m, and pressure is 4.00atm
November 20, 2010

Chem
A scuba diver creates a spherical bubble with a radius of 4.0 at a depth of 30.0 where the total pressure (including atmospheric pressure) is 4.00 . What is the radius of the bubble when it reaches the surface of the water? (Assume atmospheric pressure to be 1.00 and the ...
November 20, 2010

chemistry
23) The equilibrium constant for the gas phase reaction 2NH3 (g) <-> N2 (g) + 3H2 (g) is Keq = 230 at 300 °C. At equilibrium, __________. A) reactants predominate B) products predominate C) only products are present D) roughly equal amounts of products and reactants ...
November 18, 2010

chemistry
Iodine-131 has a half-life of 8 days. How many grams of a 12 g sample will remain at the end of 40 days? how do i solve this? i thought it was 12^40=1.5 but thats wrong...
November 18, 2010

chemistry
how do i solve the following problem? Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of Disappearance of NO2 for this period is ...
November 17, 2010

chemistry
how do i solve the following problem? Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of Disappearance of NO2 for this period is ...
November 17, 2010

chemistry
how do i solve the following problem? Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of Disappearance of NO2 for this period is ...
November 17, 2010

Physics
A ball is thrown upwards on the moon with an initial speed of 35m/s. Calculate (a)the time taken to reach the maximum height. (b) the maximum height reached by the ball (c) Its velocity 3seconds after it has been thrown. (g=1.6ms^2)
November 16, 2010

Physics
A stone is thrown vertically upwards from the top of a tower 50.0m high with an intial velocity of 20.0m/s. (a) whats the maximum height the stone reaches? (b) Whats the time it takes to reach the maximim height? (c) What is the total distance it covers?
November 16, 2010

8th grade science
1.) How does reading across a periodic table compare and contrast with reading down a group on the periodic table?
November 15, 2010

8th grade science
1.) How does reading across a periodic table compare and contrast with reading down a group on the periodic table?
November 15, 2010

social studies
why does al qaeda exist?
November 12, 2010

social studies
What Does Al-Qaeda actually want to achieve
November 12, 2010

social studies
thank you
November 12, 2010

social studies
How do terrorist groups use the media to portray their message
November 12, 2010

Chemistry
Draw the Lewis structures for each of the following, determine the shape of the molecules. a. H2S b. CN3- c. CCl4 d.NH4 e.PO4- f.PCL3 f.SF6 and explain how do you determine the shape of it
November 11, 2010

Chemistry
Draw the Lewis structures for each of the following, determine the shape of the molecules. a. H2S b. CN3- c. CCl4 d.NH4 e.PO4- f.PCL3 f.SF6 and explain how do you determine the shape of it
November 11, 2010

Chemistry
Draw the Lewis structures for each of the following, determine the shape of the molecules. a. H2S b. CN3- c. CCl4 d.NH4 e.PO4- f.PCL3 f.SF6 and explain how do you determine the shape of it
November 11, 2010

Chemistry
For each reaction, complete and balance the equation and give the net ionic equation. a) KOH(aq)+ZnCl2(aq)-> KCl2+ZnOH Oops theres the question...
November 10, 2010

Chemistry
The second half of the equation is how i had done on the exam but he said its not balanced. How do I balance this? How would it look. I keep trying but not getting. I would appreciate it if you could do this question so I can use as a guide for other similar questions.
November 10, 2010

Chemistry
For each reaction, complete and balance the equation and give the net ionic equation. a) KOH(aq)+ZnCl2(aq)-> KCl2+ZnOH The second half of the equation is how i had done on the exam but he said its not balanced. How do I balance this? How would it look. I keep trying but not...
November 10, 2010

Chemistry
I keep calculating the square root of 3RT/M, and am not worrying about the temperature. I keep using 238 and 235 as my M when I do calculate it for both isotopes. Then I end up getting 1.00 as my final answer. That can't possibly be correct, can it? The question was: The ...
November 10, 2010

chemistry
I got the square root of 238/235 is 1, and I know that R mutiplied by 3 is 24.9, but I'm stuck right there.
November 9, 2010

chemistry
The two isotopes of uranium, 238U and 235U, can be separated by effusion of the corresponding UF6 gases. What is the ratio (in the form of a decimal) of the root-mean-square speed of 238UF to that of 235UF6 at constant temperature?
November 9, 2010

Chemistry
Calculate the change in heat when 3.05g of water vapor (steam) at 100.0 degrees celsius condenses to liquid water and then cools to 18.50 degrees celsius.
November 8, 2010

calculus
Find the differential dy of the given function: y=xcosx would this just be dy=(cosx-xsinx)dx
November 8, 2010

physics
A bucket of mass 2.20 kg is whirled in a vertical circle of radius 1.15 m. At the lowest point of its motion the tension in the rope supporting the bucket is 28.0 N. a) Find the speed of the bucket. b)How fast must the bucket move at the top of the circle so that the rope does...
November 4, 2010

Maths B
Hi, i was just wondering if you could help me with how to work out this question, as i have attempted and get a bit confused at the end. here it is: A cylinder is inside a sphere- the sphere has a radius of R. What is the maximum volume of the cylinder? Thanks - really ...
November 2, 2010

Calculus
Do points of inflection have to be defined in the original function?
October 30, 2010

College Algebra URGENT
f(x)=1/(x+4) g(x)1/(6x+4) what is f(composed)g(x) if x does not equal -4/6 please help me
October 29, 2010

english
What format is used when writing a book report
October 27, 2010

chemistry
Determine the ratio of cations to anions for the following ionic compounds a. potassium, a salt substance b. calcium floride, used in steel industry c. aluminum oxide, known as corundum in the crystalline form d. calcium oxide, used to remove sulfur dioxide from power plant ...
October 24, 2010

physics
A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?
October 21, 2010

physics
A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?
October 21, 2010

Physics
A jetliner is moving at a speed of 270 m/s. The vertical component of the plane's velocity is 39.8 m/s. Determine the magnitude of the horizontal component of the plane's velocity. Can someone please solve this?
October 20, 2010

chem
i understand most of the problem but where did the 0.84 M come from? a drug was injected into your body with a 2.00 M concentration. what would be its concentration after 0.010 seconds if k = 875 ^ -1 1st order reaction! ln [ A ]t = - (875 ^ -1) (0.010 SEC) + ln (2.00) = - 0....
October 19, 2010

math 2nd grade
How do you figure this out please help my daughters first grade teacher gave this homework and I don't have a clue
October 17, 2010

8th grade science
why are neuclar waste products a problem?
October 11, 2010

physics
A 715 kg object is lifted from the surface of the earth to a height of 880 kg above the surface of the earth. Calculate the increase in gravitational potential energy using the exact expression and compare it with the approximate expression using g=9.81. Give the magnitude of ...
October 8, 2010

management
I have ths secton to, I just don't know where to start. My learning teams, needs it tonite. And I am totally lost.
September 30, 2010

Physics
An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field B. Find the ratio of the radii of their circular orbits when the electron and the proton have the same momentum. Find the ratio of the radii of their circular orbits when the ...
September 28, 2010

Physics
An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field B. Find the ratio of the radii of their circular orbits when the electron and the proton have the same momentum. Find the ratio of the radii of their circular orbits when the ...
September 28, 2010

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