Tuesday
July 7, 2015

Posts by K


Total # Posts: 792

Chemistry
The Hydrolysis Reactions - Write net-ionic equations for the reaction of each salt with water below. If there is no reaction, write N.R. 1. NH4C2H3O2 2. NH4Cl 3. NaCl 4. Na2CO3 5. NaC2H3O2 6. NaHSO4 7. FeCl3 8. NaH2PO4 9. NaHCO3
April 30, 2011

math
yeah in some cases if you really truley need it,like maybe if your dealing with decimals
April 28, 2011

algebra
explain why a solution of a word problem should be checked using the original wording of the problem and not the equation written from the wording
April 12, 2011

math
8x+16÷x^(2)-1 . x+1÷4x+8
March 30, 2011

physics
It takes 15 seconds for a wave to pass a buoy 25 meters from shore. If its wavelength is 30 meters, what is its speed.
March 30, 2011

Chemistry
Titration of an Unknown Acid... What effect on the molar mass of the unknown acid would each of the following have... Would it make the calculated molar mass high, low, or would it have no effect? 1. Adding 5 drops of phenolphthalein instead of 1 drop... Answer: No effect. 2. ...
March 26, 2011

Chemistry
Would it be better to use an unknown acid sample of a size that should require 10.00 milliliters or one that would require 15.00 milliliters of titrant? Explain. I have been thinking about this question... And I don't believe it matters what measurement of milliliters is ...
March 26, 2011

Chemistry
Thank you.
March 26, 2011

Chemistry
Why is it important to swirl the NaOH solution each time before using it during a titration?
March 26, 2011

physics
Two electrostatic point charges of +30 ìC and +25 ìC exert a repulsive force of 200 N on each other. What is the distance between the two charges?
March 25, 2011

Math
A right square pyramid’s base has edges measuring 20 feet each. If the pyramid’s height is 27 feet, what is its volume, in cubic feet?* *Could you include an explanation as well?
March 15, 2011

Chemistry
The freezing point of a cyclohexane sample is 6.20*C. A soltuion is prepared by dissolving 0.4660g of an unknown solute in 36.0g cyclohexane. The freezing point of the solution if 4.11*C. Calculate the molar mass of the unknown solute. Kf for cyclohexane is 20.0*Ckg/mole.
March 14, 2011

earth science
how does the apparent diameter of the sun from earth affect the orbital velocity?
March 14, 2011

physics
how much should a ramp rise over 10 meters of run for an angle of 12 degrees
March 10, 2011

Calculus
D) 54 One vertex is x,y and the other is -x,y y= 27 - x^2 A= 1/2 BxH B = x - -x = 2x H = 27 - x^2 A = 1/2 * 2x * (27 - x^2) Take the derivative, find when the derivative is = 0 then plug that back in to get dimensions and solve for area.
March 8, 2011

Chemistry
What are 3 possible reasons why a percentage recovery might be low? And what are 3 possible reasons why a percentage recovery might be well over 100%?
March 6, 2011

Chemistry
Iron is obtained from iron ore according to the following reaction: Fe2O3+CO---> Fe+CO2 (unbalanced). a. Assuming the blast furnace is 90.0% efficient in recovering the iron, what is the actual mass of iron obtainable from a ton of ore? b. What is theoretical yield of iron ...
March 6, 2011

Chemistry
How many milliliters of 3.0 M NaOH are required to react with 0.50g of Cu2+ to form Cu(OH)2?
March 6, 2011

Chemistry
How many milliliters of 3.0 M NaOH are required to react with 4.0mL of 16.0 M HNO3? ---> Not sure if I am solving correctly but I keep getting 21mL.
March 6, 2011

French - Help :(
Hi all. I'm trying to write a paragraph in french. These are my instructions: Décrivez vos activités habituelles pendant les vacances dernières en utilisant au moins sex verbes réfléchis à l'imparfait. This is what I want to ...
March 1, 2011

geometry
The width will be 6 in.
February 17, 2011

Math
4/13 is cause 4*3 is 12 so thats the close you gonna get so the answer is 31
February 14, 2011

Chemistry
A 0.188g sample of unknown metal, X (s), produced 71.4 ml of hydrogen gas when reacted with HCL according to the equation: X(s)+2HCL(aq)--->XCl2(aq)+H2(g) The gas was collected over water at 23 degrees Celsius. The levels of water inside and outside the gas collecting tube ...
February 10, 2011

Chemistry
A 0.0677g sample of magnesium metal reacted with excess hydrochloric acid to produce 69.9 ml of hydrogen gas. The gas was collected over water at 21.0 degrees Celsius. The levels of water inside and outside the gas collecting tube is identical. The water vapor pressure at 21.0...
February 10, 2011

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

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