Friday
August 22, 2014

Posts by help


Total # Posts: 896

Ap Chemistry
:) Thanks you so much! :)
October 24, 2010

12th grade
Okay, sorry....I posted it again correctly :)
October 24, 2010

chemistry
Its just a general question. I'm trying to get the van't hoff factor and i think you need to know number of ions present. for example how do you know the # ions present in k2s
October 23, 2010

chemistry
How do you know the number of ions present in a compound.
October 23, 2010

Chemistry
Calculate the number of molecules in 3.1466x10^1 grams of sulfur dioxide, SO2
October 22, 2010

Chemistry
Calculate the number of molecules in 3.1466x10^1 grams of sulfur dioxide, SO2
October 22, 2010

Chemistry
calculate the grams of sodium in 17.606 g of Na2CO3
October 22, 2010

5th grade
88.8 or if you round 89
October 14, 2010

4th grade
all but a circle
October 14, 2010

Physics
A speedboat starts from rest and accelerates at 2.689x10^0 m/s2 for 6.5062x10^0 seconds. After that, the boat then accelerates at 1.7853x10^0 m/s 2 for 3.1299x10^0 seconds. What is the velocity of the boat at the end of this, expressed in 4 significant figures?
October 13, 2010

chemistry
please
October 13, 2010

chemistry
please
October 13, 2010

chemistry
Help please =)
October 13, 2010

math
math box! 5=15 10=25 15=35 20=45 25=55 what is the rule
October 13, 2010

science
try chicken wire
October 13, 2010

2nd grade
63
October 12, 2010

Physics
A car travels a total distance of 3.22911x10^2 m to the East in 6.7135x10^1 s. What is the speed of the car, in m/s with 4 significant figures? Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10
October 12, 2010

math
how do yu find the implicit differentiation for this porblem 4cosx*siny=1
October 11, 2010

math
Find two point on a circle x^2+y^2=1 where the slope of the tangent line is -2 write the equation for the normal lines at these points.
October 10, 2010

math
For the given function, find all points on an the graph where the tangent line is horizontal or vertical. y= xsqrt(4-x^2) y= sqrt(1-x^2)(4-x^2)
October 10, 2010

chemistry
225g
October 1, 2010

chemistry
43g
October 1, 2010

chemistry
of KCl
October 1, 2010

chemistry
A solution was prepared by dissolving 43.0 of in 225 of water. Calculate the mass percent of in the solution.
October 1, 2010

math
how?
September 30, 2010

math
wat is the answer for the pattern 1,3,6?
September 30, 2010

physics
The flywheel of a steam engine runs with a constant angular speed of 164 rev/min. When steam is shut off, the friction of the bearings and the air brings the wheel to rest in 1.6 h. I found the constant angular acceleration as 1.71rev/min^2. They also ask you to find What is ...
September 28, 2010

Biochemistry
What is the net ionic equation for Phosphate ion + ammonium molybdate in the presence of nitric acid?
September 27, 2010

physics
A coin with a diameter of 1.9 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 19 rad/s and rolls in a straight line without slipping. The rotation slows with an angular acceleration of magnitude 2.1 rad/s2. What is the ...
September 27, 2010

physics
The flywheel of a steam engine runs with a constant angular speed of 164 rev/min. When steam is shut off, the friction of the bearings and the air brings the wheel to rest in 1.6 h. I figured out the constant angular acceleration=1.71 rev/min2 but im not sure how to find:What ...
September 27, 2010

phsics
A coin with a diameter of 1.9 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 19 rad/s and rolls in a straight line without slipping. The rotation slows with an angular acceleration of magnitude 2.1 rad/s2. What is the ...
September 27, 2010

phsics
thanks that makes sense
September 27, 2010

phsics
You plan to throw stones by using a sling of length 1.8 m which you whirl over your head. Suppose you wish to throw a stone a distance of 29 m. What must be the centripetal acceleration of the stone just before its release if it is to reach this distance? Assume that the ...
September 27, 2010

physics
An arrow, starting from rest, leaves the bow with a speed of 16.5 m/s. If the average force exerted on the arrow by the bow were doubled, all else remaining the same, with what speed would the arrow leave the bow?
September 25, 2010

physics
A bat flying in a cave emits a sound and receives its echo 0.3 s later. How far away is the cave wall? Assume the speed of sound to be 340 m/s. Answer in units of m.
September 23, 2010

chemistry
What is the conjugate base of the following substances: a. (CH3)3NH /(CH3)3N b. H3N-CH2-COOH / H3N-CH2-COO c. H3N-CH2-COO / H2N-CH2-COO d. OOC-CH2-COOH / OOC-CH2-COO e. OOC-CH2-COOH / HOOC-CH2-COOH
September 19, 2010

Algebra
kewl
September 12, 2010

Algebra
Why is it necessary for the encoding function to be one-to-one?
September 12, 2010

mathematics
1/3 + 1/6 = simplify it later i need explanation of how you get this for example 3/4 + 1/8 = 3/4=6/8 6/8 + 1/8= 7/8 how did they get 6/8 im confused thanks for helping and please.
September 12, 2010

Algebra
A size 36 shoe in France is size 3.5 in England. A function that converts shoe sizes in France to those in England is g(x)= 3x-94/4. A size 6 shoe in the United States is size 3.5 in England. A function that converts shoe sizes in England to those in the United States is f(x)=...
September 12, 2010

science
thanks drwls :)
September 7, 2010

science
This biome extends across Canada and down the Sierra Nevadas and Rocky Mountains. It has large coniferous forests. This biome is the _____. a) desert b) grassland c) tundra d) taiga e) deciduous forest I PICKED D
September 7, 2010

science
All the following are conservation practices, EXCEPT______? a) reducing consumption b) reducing production of goods using the resource c) recycling d) restoring the environment e) reducing waste I PICKED D
September 7, 2010

science
When cold air moves below warm air (which rises), we feel _______, depending on how fast the air moves. a) an earthquake or earth tremor b) a drizzle or rainstorm c) a breeze or wind d) a tornado or thunderstorm d
August 26, 2010

algebra
solve by elimination 3x+4y=2 6x+8y=4 stuck!!
July 21, 2010

math
Find y '. y = (2x^3 + 6)(2x^7 - 3)?
July 4, 2010

COM 220
nEED HELP WITH A FULL SENTENCE OUTLINE ON MEDIA VIOLENCE
May 27, 2010

Aleg
In 1991, the life expectancy of males in a certain company was 68.2 years. In 1997, it was 70.7 years. Let E represent the life expectancy in year t and let t represent the number of years since 1991. 1) The linear function E(t) that fits the date is E(t)=____t+____ Round to ...
May 26, 2010

Math help please!!!
edit: should be 3p^2q(1+3q-4q^2)
May 20, 2010

Math help please!!!
Factor completely 3p^2q + 9p^2q^2 - 12p^2q^3 I have done the following: 3p^2q(1+3q-4q^) but then i get stuck..not sure if that's the final answer..
May 20, 2010

economic
Rational people think at the margin that is one of the principle that I pickplay a major role out so can you provide an example for each about decision making interaction and the working of the economy.Explaine how that influences the marginal benefits and marginal costs ...
May 14, 2010

economic
which of the 10 principle do you think play a major role in your decision Provide an example for each about decision making interaction and the working of the economy.Explain how that influences the marginal benefits and marginal costs associated with the decision to purchase ...
May 14, 2010

Math
Use mathematical induction to prove that 5^(n) - 1 is divisible by four for all natural numbers n. Hint: if a number is divisible by 4, then it has a factor of 4. also, -1 = -5 +4 This is a take home test so I don't want the answer because I want to know how to do it. this...
May 12, 2010

math
1)In the figure, the vertices of right-angled isosceles triangle ABC are A, B(2,0) and C(8,0) respectively. find the equations of AB and AC 2)If the x-intercept and y-intercept of the straight line L: B(y-2) =Ax+8 are -8 and 3 respectively, find a)the value of A and B b)the ...
May 11, 2010

math: not sure how to figure out
Suppose a coin is biased so that it has the probilities below for landing on heads or tails on a single toss of the coin. P(h)=0.5020 P(t)=0.4980 If this coin is tossed twice find the probability P(hh)
May 6, 2010

Chemistry
The vapor pressure of nitrogen at several different temperatures is shown below. Temperature Pressure () 65 130.5 70 289.5 75 570.8 80 1028 85 1718 Use the data to determine the heat of vaporization of nitrogen. Determine the normal boiling point of nitrogen.
April 29, 2010

chem
Can someone help me I need to find out how to solve the following equation What is the PH/POH of a .0727m H3O+ Solution at 25 degrees c
April 28, 2010

Chem
The density of an unknown metal is 8.94 g/cm^3 and its atomic radius is 0.126 nm . It has a face-centered cubic lattice. Find the atomic weight of the unknown metal.
April 28, 2010

chem
Why are titrations using permanganate performed in acid solution?
April 28, 2010

chem
Why are titrations using permanganate performed in acid solution?
April 28, 2010

chem
Why are titrations using permanganate performed in acid solution?
April 28, 2010

chemistry
hmmmm this doesn't seem to help
April 23, 2010

chemistry
If this "point" for a particular titration occurs at pH x, a good indicator for for the titration would be indicator. Note: Provide only 1 indicator name (even if there are other indicators possible) and make sure the spelling is correct. X indicator 0.9
April 23, 2010

Chemistry
45.0 ml of 9.0x10 the negative 2m hno3 I am needing the steps to help solve the above chem equation
April 20, 2010

chemistry
If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration for the standardized base will be (low, high, or unaffected) A drop of NaOH is hanging from the buret tip before the titration of KHP. Once the student begins ...
April 18, 2010

Chemistry
question from my previous post answered by DrBob - is this because this acts as a polyprotic acid, or because the ratio in the Henderson Hasselbach for HA/A- remains the same?
April 13, 2010

Chemistry
is this because this acts as a polyprotic acid, or because the ratio in the Henderson Hasselbach for HA/A- remains the same?
April 13, 2010

Chemistry
How would the pH differ for a 0.1M solution of NaHCO3 vs 0.2M NaHCO3 - remain the same, double, half,or can't be calculated without Ka or Kb?
April 13, 2010

math
According to the Journal of Irreproducible Results, any obtuse angle is a right angle! Here is their argument. Given the obtuse angle x, we make a quadrilateral ABCD with  DAB = x, and  ABC = 90◦, andAD = BC. Say the perpendicular bisector toDC meets the ...
April 1, 2010

math
According to the Journal of Irreproducible Results, any obtuse angle is a right angle! Here is their argument.
April 1, 2010

math
Show that there are no positive integers n for which n4 + 2n3 + 2n2 + 2n + 1 is a perfect square. Are there any positive integers n for which n4 +n3 +n2 +n+1 is a perfect square? If so, find all such n.
April 1, 2010

Chemistry
Why is it important to use liquids with relatively lower boiling points when using the Dumas method?
April 1, 2010

Chemistry
How do you know that the NaCl has 100 ml. How much volume does the water which is also a product have?
April 1, 2010

Chemistry
How do you determine the moles of just NaCl? and is the moles of HCl and NaOH just the molar mass? Thanks
April 1, 2010

MAth
f(x)=x^2-9x+3
March 28, 2010

MAth
f(x)=x^2-9x+9
March 28, 2010

History
WHy ere the women in ancient egypt better off than the women in ancient greece? THANKS, HELP
March 18, 2010

Chemistry
Problem: In a first order decomposition reaction, 50% of a compound decomposes in 10.5 minutes. What is the rate constant of the reaction? The solution my professor gave says: k = .693 / 10.5min Where did the .693 come from? Thanks
March 15, 2010

college STATISTICS
Sample of 80 people randomly asked in casino shows that average lost per person is $160 with a standard deviation ó = $40. Based on this data create a 99% confidence interval for population mean. Does loss of $180 for single person contradict expectation? Explain your ...
March 7, 2010

Math
An urn contains 4 green, 6 blue and 10 yellow chips. You pay $5 to draw a chip from the urn. Here are the rules of the game: if you draw a green chip, the dealer returns you your bet and gives you an additional $5. if you draw a blue chip, the dealer returns you your bet and ...
March 7, 2010

Physics
An army of armadillios is attacking Cosine Castle where the coyotes reside. If an army must clear the 45 meter walls by 5 meters, at what angle must they set their cannons (from the horizontal) in order to fire inside the castle walls? The cannons fire cannonballs at 50 m/s. ...
February 13, 2010

Business
thnx:D
January 30, 2010

Business
Make sure to identify: • Your expectation of use of research by you in the workplace (ie: user, researcher, contributor) May i knoe what this quesiton is asking!!! thnx
January 30, 2010

english!
THNX.:D
January 29, 2010

english!
Write a short analysis of the use of researching in your future industry – how do they gather or use research ie: types of projects, proposals, etc… -can u explain this question to me plz. are they asking me to write a paragraph explaing how do they do research adn ...
January 29, 2010

Math
a) What is Agnessa's hourly rate of pay in a year with 26 biweekly paydays? b) Using your hourly rate computed in part a), what would Agnessa's gross earnings be for a pay period working an extra 10 hours overtime paid 1.50 times the regular rate of pay? (should be ...
January 29, 2010

7th grade math
can you help me ms.sue
January 28, 2010

math
plzzzzzzzzzzzzzz help me
January 28, 2010

math
tim and jim shared 35$ in the ratio 4:3 .how much did tim get ?
January 28, 2010

math
amy sloved 3/5 of her math problems and had 24 left to do. how many problmes did she solve ?
January 28, 2010

science
thank you so much for helping me.
January 28, 2010

5th Grade Science
oko;
January 28, 2010

Earth Science
Which of the following help create volcanoes? plate tectonics landslides cracks in Earth's crust built up magma
January 28, 2010

Physics
A merry-go-round accelerates from est at .870 rad/sec^2. When the merry-go-round has made 4 complete revolutions, how much time has elapsed since the merry-go round started? What is the angular velocity of the merry-go round? Could someone help, please
January 27, 2010

6th grade math
you dont know that we are learning that in 5th grade
January 26, 2010

Physics
Starting from rest Maria pulls horizontally on her new wagon for 1.1 seconds. She exerts a constant force of 89N against a frictional force of 43N. The wagon's final velocity is 3.2m/s. If she is on a level ground, how much does the wagon weigh?
January 26, 2010

Math 117
it takes 4 hr for 8 cook to prepare a dinner. how long would it take for 7 cooks? inverse or direct variation?
January 25, 2010

Algebra 2
2. Biologists want to set up a station to test alligators in the lake for West Nile Virus. Suppose that the costs for such a station are $2,500 for setup costs and $3.00 to administer each test. a. Write an expression that gives the total cost to test x animals.
January 25, 2010

algebra
5+5x<40
January 24, 2010

algebra
im not good at algebra is it 4
January 24, 2010

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Next>>

Search
Members