Thursday
December 18, 2014

Posts by K


Total # Posts: 768

Chemistry
A sample of oxygen gas is collected by displacing water from an inverted bottle as shown in the diagram below. The volume of O2(g) collected is 400.0ml at 25 degree Celsius. The atmospheric pressure is 680 torr and the vapor pressure of water at 25 degree Celsius is 23.8 torr...
February 3, 2011

Chemistry
CaO(s) reacts with SO2(g) according to the following equations: CaO9(s)+So2(g)--> CaSO3(g). A 8.85g mixture containing CaO(s) is placed in a 3.00-L container. The container is filled with SO2(g) to a pressure of 749 torr, at 20.0 degree Celsius. After the reaction has gone ...
February 3, 2011

Chemistry
Consider the flasks diagrammed below. What is the total pressure in torr after the stopcock between the two flasks is opened? He(g)---> V=1.25L and P=0.300atm and Ar(g)---> V=2.50L and P=233 torr.
February 3, 2011

Chemistry
A steel cylinder contains 98.0 moles of oxygen gas at temperature of 38 degree Celsius and a pressure of 740 torr. After some of the oxygen gas has been used, the pressure is reduced to 332 torr at a temperature of 24 degree Celsius. What mass of oxygen gas is removed from the...
February 3, 2011

Chemistry
A compound contains only hydrogen and nitrogen and is 12.6% hydrogen by mass. A gaseous sample of the compound has density of 0.925g/L at 690 torr and 110 degree Celsius. What is the molecular formula of the compound?
February 3, 2011

Math
The graphs of y= x^2 - 8x - 35 and y= -2(x^2) + 16x +3 intersect in two points. What is the sum of the x-coordinates of the two points of intersection?
February 2, 2011

Math
How many non-congruent triangles with only integer side legnths have a perimeter of 15 units?
February 2, 2011

Math
There is a 4 x 4 square grid. Two unit squares are chosen from the 16 unit squares possible. What is the probability that they do NOT have a vertex in common? Express your answer as a common fraction.
February 2, 2011

Math
There is a 4 x 4 square grid. Two unit squares are chosen from the 16 unit squares possible. What is the probability that they do NOT have a vertex in common? Express your answer as a common fraction.
February 2, 2011

algebra
4.42 hrs. 1/7 +1/12 = 19/84 84/19= 4.42...
February 2, 2011

Math
When x^2-5x+3c is divided by x-3 the remainder is -12. What is the value of c?
February 2, 2011

Math
How many unit cubes would it take to construct the complete exterior of a hollow cube with edges of 4 units and faces 1 unit thick?
February 2, 2011

Chemistry
Concentrated sulfuric acid is 18.4 molar and has a density of 1.84 grams per milliliter. After dilution with water to 5.20 molar the solution has a density of 1.38 grams per milliliter. This concentration of H2SO4 is often used in lead storage batteries(like a car battery). 1....
January 13, 2011

Chemistry
Thank you.
January 11, 2011

Chemistry
The grams of oxygen that would produce 13.4 g Cl^2O^7 molecules.
January 11, 2011

Math
Can u (C) it? Start w/ (x) next is (x +2) next is (x + 4)
January 9, 2011

Math
This is a proportion problem. There are two ways to solve this. The 1st way, my preferred one, is to take 6 and 10 as a ratio. 6:10 simplyfied is 3:5. So, 45 / 5 is equal to 9, so 3 * 9 = 27. That may be a little confusing sometimes so there is a second way. Take 6/10. It is ...
January 9, 2011

Math
How many five-digit integers are perfect squares?
January 9, 2011

algebra
if the length is 7 meters longer than its width. what is the width of the object if the perimeter is equal to 98
January 6, 2011

Math
How did the Hunter get hurt while benind over to study some tracks? Algebra with Pizzazz! pg 123 OBJECTIVE: to divide a polynomial by a binomial EX: (x^2+8x+150/(x+5)
January 2, 2011

Child day care managment
A childs ability to jumb for distance is an example of ? a. agility b. flexibility c. explosive power d. reaction time my answer is c what you think? The most important consideration when installing playground equipment is ? a. cost b. height c. finishing materials d. surface ...
December 29, 2010

algebra
find the illegal values of c in the multiplication statement c^2-3c-10/c^2+5c-14.c^2-c-2/c^2-2c-15
December 17, 2010

Trig
An airplane is flying on a compass heading (bearing) of 340 degrees at 325 mph. A wind is blowing with the bearing 320 degrees at 40 mph. Find the component form of the velocity of the airplane. then find the actual ground speed and direction of the plane
December 17, 2010

ALGEBRAIC FRACTIONS
find the illegal values of C in the multiplication statement c^2-3c-10/c^2+5c-14 . c^2-c-2/c^2-2c-15
December 12, 2010

algebra
multiply r^2+7r+10/3 by 3r-30/r^2-5r-50
December 11, 2010

ALGEBRA
multiply r^2+7r+10/3 by 3r-30/r^2-5r-50
December 11, 2010

ALGEBRA
divide 40x/64y by 5x/8y
December 11, 2010

ALGEBRA
divide m^2n^3/p^3 by mp/n^2
December 11, 2010

algebra
reduce the fraction 6x/12x to lowest terms
December 8, 2010

algebra
1/2 right
December 8, 2010

algebra
reduce the fraction 6x/12x to lowest terms.
December 8, 2010

9th grade geometry
bisector
December 2, 2010

chemistry
I completely understand Le Chateliers principle but I have no idea about these questions. They're due tomorrow so fast help would be appreciated. Why did adding water to the equilibrium involving CoCl_4_^2-^ cause the color to change? Use Le Chateliers principle to explain...
December 1, 2010

Chemistry
-69
December 1, 2010

Calculas
2.oo6
December 1, 2010

Calculus - MathMate Please help
nope, you are wrong. I got the correct answer. area1 and area2 are not equal to each other since their limits are DIFFERENT. for area1, the limits should be (from 0 to c/2) and for area2. the limits should be (from pi/2+c to pi). by solving it i got the value for c. Thank you ...
November 29, 2010

Calculus - MathMate Please help
ok, i tried to do what you told me but i cant solve it for c because they cancel each others out! the integral for the first one i got is [sin(c)cos(x)-cos(c)sin(x)+sin(x)+c] and the integral for the 2nd one i got is [-sin(c)cos(x)+cos(c)sin(x)-sin(x)+c] I dont know what to do...
November 29, 2010

Calculus - MathMate Please help
I got two areas but i cant solve it for c because they cancel each others out!!! the integral for the first one i got is [sin(c)cos(x)-cos(c)sin(x)+sin(x)+c] and the integral for the 2nd one i got is [-sin(c)cos(x)+cos(c)sin(x)-sin(x)+c] I dont know what to do from here. can u...
November 29, 2010

Calculus - MathMate Please help
Thank You. I think i got the idea. i will try to solve it.
November 29, 2010

Calculus - MathMate Please help
I asked this question on last thursday and u told me that the bottom limit for the 1st and the right limit for the 2nd area is missing? The question that i posted had no other information and i dont know why you said that the limits are missing. There is no other limits that ...
November 29, 2010

Calculus - please help!
yes, ¥ðstands for pi. The quesiton that i wrote above is all information that are given. There is no other limit on this integration. I will wrote the question once again. Please help. Thank You. Suppose that 0 < c < pi/2. For what value of c is the area of the ...
November 25, 2010

Calculus - please help!
Suppose that 0 < c < ¥ð/2. For what value of c is the area of the region enclosed by the curves y = cos x, y = cos(x - c), and x = 0 equal to the area of the region enclosed by the curves y = cos(x - c), x = ¥ð, and y = 0? i have no idea how to solve this...
November 25, 2010

Chemistry
How many air molecules are in a \rm 12.0 \times 12.0 \times 10.0~ft room? Assume atmospheric pressure of 1.00 \rm atm, a room temperature of 20.0 \rm {}^{\circ}C, and ideal behavior. Volume conversion:There are 28.2 liters in one cubic foot
November 16, 2010

math
A full container holds 5/8 of a gallon of liquid. If the container is 4/5 full, how much liquid is in the container? I need answer to problem and how you solved it using words for the explanation.
November 14, 2010

algebra
f-g/1 = g/1 How can I make g the subject?
November 1, 2010

maths
A bond with face value of $500 redeemable at par in 13 years time, is paying interest at j2 = 9.0%. Find the purchase price of the bond to give a yield to maturity of j2 = 8.4%.
October 26, 2010

9th grade
In the odyssey, what is book 16, 17, 21, 22, and 23 about in a short summary? Also explain the conflict. Some Traits of an epic hero also. Please help!!!
October 24, 2010

chemistry
What is the final temperature of a 52 gram glass of water at 2.0 C if it absorbs 3.0 J heat?
October 12, 2010

government
how does the national government's relationship to the states differ from the states' relationship to local government?
October 11, 2010

chemistry
write a balanced chemical equation for the reaction that occurs when aqueous solutions of sodium chloride and sodium iodate are mixed
October 5, 2010

geometry
collinear points gk=45, hl=18, and gh=hi=i. find the length of each segment
October 4, 2010

SETS AND COUNTING
174
October 4, 2010

physics
Sooo... Isaac kicks a soccer ball 11.5 m/s at an angle of 41 degrees above horizontal. What is the velocity of the ball just before striking the ground???
October 1, 2010

physics
The leg and cast in the figure below weigh 260 N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w1 weighs 125 N. Determine the weight w2 AND the angle α needed so that no force is exerted on the hip joint by the leg plus cast.
September 27, 2010

physics
The leg and cast in the figure below weigh 260 N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w1 weighs 125 N. Determine the weight w2 AND the angle α needed so that no force is exerted on the hip joint by the leg plus cast.
September 27, 2010

Physics
If a soccer ball is kicked at 11.5 m/s at an angle of 41 degrees above horizontal, what is the ball's maximum range?
September 27, 2010

science
what factors affect plant growth, i nkow light, water, and all the stuff but more things please, for my science project!:)
September 16, 2010

Math Problems
Lauren earns $3.75 per hour as an usher. In 5 days her tips were $19.75, $25.30, $18, $21.50, and $18.50. Find Lauren’s average daily tips and use them to predict her earnings for a 37-hour workweek in which she works 4 days. (In other words, how much would she earn for a...
September 16, 2010

geometry
i got it now, thx!
September 13, 2010

geometry
I still dont understand.
September 13, 2010

geometry
point G is the midpoint of EF EG= 4x+12 and EF= 2x+30. How do i find GF?
September 13, 2010

Math
99,88,198,197,?,296,396
September 12, 2010

college
a light bulb manufacture claims that the mean life of a certain type of light bulb is more than 750 hours
August 20, 2010

accounting
It depends on the materials in question.
August 20, 2010

childcare
1. d is not the right answer and iam not too sure about c.
August 18, 2010

chemistry
AgCl is insoluble / dissolves really slowly, but I'm guessing from the question that it means the latter. It should form AgI given enough time.
July 6, 2010

physics
6.4
July 1, 2010

social studies
The task of economic policy is to create a prosperous America. The unfinished task of prosperous Americans is to build a Great Society. Our accomplishments have been many; these tasks remain unfinished: > to achieve full employment without inflation; > to restore ...
June 20, 2010

statistics
A sample of 40 observations is selected from one approximately normal population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second source. The sample mean is 99 and the standard deviation is 6. Conduct a ...
May 22, 2010

chemistry
15.0 g of Potassium metal is dropped into 50.0 ml of a 1.50 mol/L solution of H2SO4. what is the mass of gas given off during the reaction?
May 12, 2010

chemistry
thanks!
May 12, 2010

chemistry
okay so i got, 0.02375 molAl(OH)3x3molH2SO4/2molAl(OH)3=0.035625molH2SO4 0.035625molH2SO4x98.08g/molH2SO4= 3.4941g H2SO4 Correct? so the 3.4941g would be how much H2SO4 needed to neutralize the spill?
May 12, 2010

chemistry
so moles Al(OH)3 = M x L = 0.500 x 0.0475 = ?? is 0.02375?
May 12, 2010

chemistry
in the lab there is a spill of 47.5mL of .500 mol/L Al(OH)3. How many grams of H2SO4 would be needed to neutralize the spill.
May 12, 2010

physics
Air will break down as a dielectric when subjected to applied fields in excess of 3 * 10^6 N/C. a parallel plate capacitor using air as a dielectric has a capacitance of 1.0nF and a separation b/t plates of 1.0micrometer. how much energy U was stored in this capacitor at the ...
April 25, 2010

chemistry
How can u determine the molar mass of a compound?
April 21, 2010

calculus high school
never mind, the second term is derived using the product rule
April 8, 2010

calculus high school
isn't that the power rule? anyway, ow do you derive teh second term?
April 8, 2010

calculus high school
thanks. you got the answer right. but i don't understand how the chain rule is used iin this problem.
April 8, 2010

calculus high school
7y^4+x^3y+x=4 using implicit differentation, how do i solve this problem. it is a textbook example but the partwhere i "use the chain rule on the first term" doesn't make sense to me because they get d/dx 7y^4+(x^3dy/dx +y d/dx x^3)+d/dx x
April 8, 2010

literary
what is the subordinating conjunction in this sentence..? I mentally outlined my essay while i waited for the bus.
March 28, 2010

physics
A sample of anthracite has a moisture content of 5% when mined and an energy density of 35 kJg-1 when completely dried. Assuming that during combustion, the temperature of the water in the un-dried coal is raised from 20.0oC to 100.oC, and then vaporized at 100.oC, estimate ...
March 10, 2010

Business
The four Ps of a marketing mix are:
March 5, 2010

business law
What do you feel about community corrections? Do you feel a community-based punishment is justifiable in today’s society? Explain why or why not. Provide an example of a community-based punishment. How do community corrections affect American society?
February 21, 2010

200
Most public schools are supported financially by district, state, and federal government agencies. Identify the roles each of these agencies has in your local schools. Which agency do you feel has the most significant influence over policy and curriculum decisions for local ...
February 18, 2010

calc
Let f(x) = x2 + 3x + 2. Find the equation of the line containing (1, f(1)) and (3, f(3)).
February 8, 2010

provine
How does the tilt of the earth affect climate
February 7, 2010

vocabulary
The mom left the room with a MODICUM of respect after her baby began ____ . a) sleeping b) screaming c) praying d) singing b is that correct
January 31, 2010

vocabulary
scathe: to attack with severe criticis, to harm, injury.
January 31, 2010

vocabulary
After the play _____, several critics made scathing comments about it. a)succeeded b)opened c)closed d)bombed a is that correct
January 31, 2010

vocabulary
The mom left the room with a MODICUM of respect after her baby began ____ . a) sleeping b) screaming c) praying d) singing b is that correct
January 31, 2010

algebra
what did the ape think of the grape's house?
January 18, 2010

science
Post a 200- to 300-word response to the following: In your own words, summarize each of the major theories of biology. • Choose one theory and provide an example of how this theory relates to the news today. • Use at least one outside reference in addition to your ...
January 15, 2010

math
In 1979 women earned .63 to each $ earned by a man. 2003 women earned 80% of what men earned. Since 2003 women lost 0.8% in earnings If the current median income for a man is 40,688 what is the median income for a woman?
December 22, 2009

physics
Two rock climbers, Bill and Karen, use safety ropes of similar length. Karen's rope is more elastic, called a dynamic rope by climbers. Bill has a static rope, not recommended for safety purposes in pro climbing. Karen falls freely about 1.7 m and then the rope stops her ...
December 12, 2009

Physics 221
A constant horizontal force of magnitude 18.0 N pushes a block of mass 2.00 kg along a rough horizontal surface for a distance of 2.00 m. During this operation the speed of the block changed from 4.00 m/s to 6.00 m/s. What work was done on the block by kinetic friction? (a) 32...
December 10, 2009

Physics 221
A 20g particle is moving to the left at 30 m/s. How much net work must be done on the particle to cause it to move to the right at 30 m/s. The answer is 0J of work, and i understand the method of equations, but i dont understand the logic behind it. Thanks for any help.
December 8, 2009

algebra
Hosni gave the following argument that 2(a 1 b) 5 2a 1 2b, for all integers a and b. If the argument is correct, supply the missing reasons. If it is incorrect, explain why not
November 22, 2009

AP BIO
The answer is 3, I know that for sure
November 22, 2009

Physic
I hate this site
November 7, 2009

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