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Questions Asked on October 25, 2010

The rate constant of a first-order process that has a half-life of 225 s is ?????? s-1.ok so i divided half life of 1st order=
1. 1 answer
2. asked by Laynie
3. 7,961 views
The reactionCH3- N≡C → CH3- C≡N is a first-order reaction. At 230.3°C, k = 6.29 x 10^-4 s^- 1. If [CH3 -N≡ is 1.00 x
1. 2 answers
2. asked by jes
3. 6,803 views
Two cars travel westward along a straight highway, one at a constant velocity of 85 km/hr, and the other at a constant velocity
1. 2 answers
2. asked by grace
3. 6,186 views
Please write a paragraph proof for this statement. Point Y is the midpoint of segment XZ. Z is the midpoint of segment YW. PRove
1. 2 answers
2. asked by Shamaree
3. 6,091 views
write an ionic and net ionic equation for the following reaction between Fe3+ and NH4OH.Please check my answer!! Thank you. My
1. 2 answers
2. asked by Christine
3. 4,424 views
Dinitrogentetraoxide partially decomposes according to the following equilibrium:N2O4 (g) -> 2NO2 (g) <- A 1.00-L flask is
1. 6 answers
2. asked by Jane
3. 4,190 views
A pelican flying along a horizontal path drops a fish from a height of 5.4m. The fish travels 8.0 m horizontally before it hits
1. 3 answers
2. asked by John
3. 4,155 views
A 120.0 mL buffer solution is 0.105 M in NH3 and 0.135 M in NH4Br, What mass of HCl could this buffer neutralize before the pH
1. 2 answers
2. asked by moe
3. 3,753 views
In a sample of solid Al(NO3)3, the ratio of aluminum ions to nitrate ions is (1) 1:1 (2) 1:2 (3) 1:3 (4) 1:6
1. 3 answers
2. asked by Jazmin
3. 3,355 views
<11{4[2(12)]}> Choose the pair of words/phrases among the choices that exhibits the same logical relationship as the
1. 3 answers
2. asked by Dean
3. 3,030 views
Brianna is working on her homework. Her assignment is to come up with four representations for an exponential function of her
1. 2 answers
2. asked by john
3. 2,941 views
A mixture contained zinc sulfide, ZnS, and lead sulfide, PbS. A sample of the mixture weighing 6.12 g was reacted with an excess
1. 3 answers
2. asked by caroline
3. 2,519 views
I am trying to figure out how to calculate the ratio of CH3NH2 to CH3NH3Cl required to create a buffer with pH of 10.26, I'm not
1. 1 answer
2. asked by moe
3. 2,497 views
A mass of 0.4 kg, hanging from a spring with a spring constant of 80 N/m, is set into an up-and-down simple harmonic motion.
1. 4 answers
2. asked by charlie
3. 2,320 views
Use the thermochemical equations shown below to determinethe enthalpy (kJ) for the reaction: H2SO3(l)=>H2S(g) + 3/2O2(g)
1. 4 answers
2. asked by anonymous
3. 2,294 views
Find the percent, round if nessacary:1) 3 dollar tip for a 18.70 Taxi Fare. So 3 x 18 Correct? Or how would I even solve this
1. 8 answers
2. asked by Allyson
3. 2,197 views
determine an exact expression for the trigonometric function sin(13pi/12).
1. 1 answer
2. asked by jj re
3. 2,176 views
The range of the function y=3x-2 is 1, 7, 13, 16 , and 19. Which number is in the domain of the function ?
1. 1 answer
2. asked by Lynn
3. 2,027 views
For this week's lab, we have to devise our own separation and purification scheme. The mixture contains three compounds, however
1. 2 answers
2. asked by Remi
3. 1,851 views
A tube of "Brilliant Yellow" acrylic paint contains titanium dioxide. What transition metal is in this compound?What important
1. 1 answer
2. asked by Caitlyn
3. 1,780 views
Data:2Ba(s) + O2(g) ¡æ 2BaO(s) ∆H¡Æ = -1107.0 KJ Ba(s) + CO2(g) + ¨ö O2(g) ¡æ BaCO3(s) ∆H¡Æ = -822.5 KJ Given the
1. 3 answers
2. asked by lavonne
3. 1,680 views
A hydrocarbon sample was burned in a bomb calorimeter. The temperature of the calorimeter and the 1.00 kg of water rose from
1. 2 answers
2. asked by lavonne
3. 1,630 views
When BaCl2-H2O (s) is dried in an oven, it loses gaseious water:BaCl2-H2O <--> BaCl2(s) + H2O (g) enthalpy change - 63.11 kJ/mol
1. 0 answers
2. asked by Tammy
3. 1,605 views
TWo blocks of massses 20 kg and 8 kg are connected together by a light string and rest on a frictionless level surface. Attached
1. 2 answers
2. asked by Gail
3. 1,600 views
if julie takes 4 hours to type up a manuscript and pat takes 6, if they work together at 12:00, what time would they finish??
1. 1 answer
2. asked by Anonymous
3. 1,585 views
I need to know how to write an equation showing how a buffer containing ammonia and ammonium chloride neutralizes added acid of
1. 1 answer
2. asked by moe
3. 1,569 views
which element in period 4 has four electrons in its electron-dot structure ?
1. 1 answer
2. asked by Raynique
3. 1,567 views
How many grams of HCl are produced according to the following equation, H2 + Cl2 = 2 HCl, when 4.0 g of hydrogen reacts
1. 1 answer
2. asked by Bill
3. 1,541 views
1.44 Tax on an item priced at 24.00? How would I solve this? I need to find the percent?Would I just divide 1.44/24.00? Thanks
1. 3 answers
2. asked by Allyson
3. 1,541 views
In detail can someone please explain to me how cooking eggs makes them safe to eat in connection with enzymes Thank youI
1. 3 answers
2. asked by carly
3. 1,529 views
A block is at rest on an inclined plane whose elevation can be varied. The coefficient of static friction is μs= 0.4, and the
1. 1 answer
2. asked by help
3. 1,515 views
From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the
1. 2 answers
2. asked by Gabbi
3. 1,509 views
why is the Northeast coast so crowded with cities?
1. 2 answers
2. asked by Beth
3. 1,489 views
60.0 g of benzene is mixed with 135g of bromine to form bromobenzene according to the following reactionC6H6+Br2-C6H5Br+HBr
1. 1 answer
2. asked by Stark State
3. 1,487 views
Ooops sorry!Please rank the following compounds in DECREASING order of their reactivity toward the SN2 reaction with sodium
1. 2 answers
2. asked by Please help
3. 1,459 views
You are given a vector in the xy plane that has a magnitude of 84.0 units and a y component of -49.0 units.Assuming the x
1. 4 answers
2. asked by bob
3. 1,424 views
If f(x)= sec x, find f"(Pi/4)I am not sure how to take the 2nd derivative? f'(x)= sec x tan x f"(x)=??? Is it f"(x)= (sec x tan
1. 3 answers
2. asked by CMM
3. 1,419 views
Describe two laws of exponents and provide an example illustrating each law. Explain how to simplify your expression. How do the
1. 1 answer
2. asked by Anonymous
3. 1,415 views
3) A student dissolves a 1.18g aspirin tablet in water and titrates thesolution with a .265M NaOH. 22.05mL of NaOH are required
1. 1 answer
2. asked by Juliet
3. 1,405 views
When a horizontal force of 4.5 newtons acts on a block on a resistance-free surface, it produces an acceleration of 2.5 m/s
1. 1 answer
2. asked by Caitlyn
3. 1,380 views
A 9.5 kg monkey is hanging by one arm from a branch and is swinging on a vertical circle. As an approximation, assume a radial
1. 2 answers
2. asked by PLEASE HELP
3. 1,366 views
A pollutant has been leaking steadily into a river. An environmental group undertakes a clean-up of the river. The amount of
1. 1 answer
2. asked by Anonymous
3. 1,363 views
how many grams of sodium chloride do you need to prepare 250 mL of a 5.00% sodium chloride solution?
1. 1 answer
2. asked by Anonymous
3. 1,340 views
jill's present weight is 14 pounds less than her weight a year ago. if her weight at the time was 9/8 of her present weight,
1. 5 answers
2. asked by Frankie
3. 1,333 views
There are three industrial firms in Happy Vally.Initial Cost of Reducing Firm Pollution Level Pollution by 1 unit A 70 units $20
1. 4 answers
2. asked by Anonymous
3. 1,328 views
From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the
1. 3 answers
2. asked by Anonymous
3. 1,323 views
suppose sin(x)=4/5 and cos(y)=-12/13, and x and y are in the second quadrant. determine the value of each expression: sin(x+y),
1. 1 answer
2. asked by jj re
3. 1,298 views
A 3.6 m diameter merry-go-round is rotating freely with an angular velocity of 0.78 rad/s. Its total moment of inertia is 1700
1. 4 answers
2. asked by Lacey
3. 1,289 views
How did Thomas Jefferson hope to remove obstacles to upward social mobility?
1. 2 answers
2. asked by john
3. 1,284 views
When a falling meteor is at a distance above the Earth's surface of 3.34 times the Earth's radius, what is its free-fall
1. 0 answers
2. asked by Starfallen
3. 1,270 views
Hi,I am writing an essay for my media studies class on the topic; Has digital technology made professional journalists obsolete?
1. 1 answer
2. asked by Savannah
3. 1,268 views
I need help with What is the solubility of silver oxide, Ag2O, in a solution buffered at pH 10.50? The Kc for the following
1. 1 answer
2. asked by Tom
3. 1,265 views
A particle moves along the curve y=square sqrt 1+x^3. As it reaches the point (2,3), the y-coordinate is increasing ata a rate
1. 0 answers
2. asked by tim
3. 1,260 views
A disk with a mass of 18 kg, a diameter of 50 cm, and a thickness of 8 cm is mounted on a rough horizontal axle as shown on the
1. 2 answers
2. asked by Oscar
3. 1,242 views
It says prepare a theoretical titration of 25 mL of 0.1037 M formic acid (HCOOH; pKa= 3.75) solution (diluted to 100mL volume
1. 2 answers
2. asked by Anonymous
3. 1,227 views
Find the magnitude of the resultant of the following two vectors: i) 50 units due east and ii) 100 units 30° north of west.the
1. 0 answers
2. asked by meera
3. 1,216 views
how many grams of potassium bromide could be recovered by evaporating 650 grams of 15 perentKBr solution to dryness......650 *
1. 2 answers
2. asked by Pierre
3. 1,214 views
I'm studying for a test and can't find the answers for the following questions...please help!What clade of bacteria produce
1. 1 answer
2. asked by Sarah
3. 1,213 views
Reflect on your experience with investing. What type of investments do you currently own/manage? What decisions are you
1. 1 answer
2. asked by troy
3. 1,199 views
1) A lottery draws six numbers from 42 possibilities, without regard to order. What is the total number of possible results of
1. 3 answers
2. asked by Jamie
3. 1,186 views
find the 90% confidence interval for the variance and standard deviation of a sample of 16 and a standard deviation of 2.1
1. 1 answer
2. asked by Anon
3. 1,182 views
A disk with a mass of 13 kg, a diameter of 25 cm, and a thickness of 8 cm is mounted on a rough horizontal axle as shown on the
1. 0 answers
2. asked by Donny
3. 1,166 views
A sample of a breathing mixture for divers contained 34.3% helium, He; 51.7% nitrogen, N2; and 14.0% oxygen, O2 (by mass). What
1. 3 answers
2. asked by caroline
3. 1,162 views
Please rank the following compounds in DECREASING order of their reactivity toward the SN2 reaction with sodium ethoxide in
1. 1 answer
2. asked by Please help
3. 1,152 views
True or False: The three-fifths compromise called for three fifths of a states LANDLESS CITIZENS to be counted as population.
1. 2 answers
2. asked by Jen
3. 1,150 views
The electron from a hydrogen atom drops from an excited state into the ground state. When an electron drops into a lower-energy
1. 2 answers
2. asked by sam
3. 1,145 views
Two objects are connected by a light string passing over a light, frictionless pulley as in the diagram. m1 = 4.50 kg, m2 = 2.10
1. 0 answers
2. asked by Anonymous
3. 1,141 views
how much energy is released when 10 g of steam at 100 degrees celsius is condensed and cooled to body temperature?
1. 1 answer
2. asked by katie
3. 1,133 views
how to add or subtract fractions with unlike denominators and give me some examples so i could understand.thank you.
1. 1 answer
2. asked by catherine
3. 1,132 views
if x-4 is 2 greater than y+1, then by how much is x+6 greater than y?
1. 3 answers
2. asked by Anonymous
3. 1,125 views
Calculate the [H3O+] of the following polyprotic acid solution: 0.145 M H3C6H5O3?
1. 1 answer
2. asked by Anonymous
3. 1,124 views
Calculate the molar solubility of BaSO4 in a solution in which [H3O+] is 2.5 M.I can almost solve this on my own. If you know
1. 1 answer
2. asked by Jay
3. 1,120 views
i am calculating an unknown acid for both monoprotic and diprotic assumptions. I calculated the monoprotic by multiplying the M
1. 2 answers
2. asked by nicole
3. 1,119 views
Please write a paragraph proof for this statement. 30: Point Y is the midpoint of segment XZ. Z is the midpoint of segment YW.
1. 2 answers
2. asked by Shamaree
3. 1,119 views
Differentiate.y= u(a cos u + b cot u) I am not sure if this correct. I was not sure whether to leave the variables as are or
1. 2 answers
2. asked by CMM
3. 1,108 views
The fastest recorded pitch in the MLB was thrown by Nolan Ryan in 1974. If this pitch were thrown horizontally, the ball would
1. 2 answers
2. asked by Autumn
3. 1,101 views
Some turtles live in the sea. Some turtles live in the land. Some turtles are pets and live in houses. The words below relate to
1. 3 answers
2. asked by 3 grade
3. 1,096 views
What was the substance usd to stuff the nostrils?
1. 2 answers
2. asked by Deaire
3. 1,093 views
What would happen to the specific heat if some of the warm metal shot were lost during the transfer to the calorimeter?Answer a.
1. 0 answers
2. asked by kellie
3. 1,088 views
A car reaches a speed of 40m/s from rest in a time of 8 seconds. After the 8 seconds, the car travels at a constant velocity fro
1. 2 answers
2. asked by Vivek
3. 1,082 views
a boat travel 5 miles due south and then 11 miles due east. how far is it from the starting point?
1. 1 answer
2. asked by tia
3. 1,082 views
Solve:4a+9b=8 8a+6c=-1 6b+6c=-1
1. 1 answer
2. asked by Kelsie
3. 1,079 views
42 is 200 percent of what number?So I put 42 over 100 is equal to 200 over x? Is this right? Can someone explain? Thank you
1. 1 answer
2. asked by Allyson
3. 1,078 views
make up a data set of at least 12 numbers that have the following landmarks. maximum 18 mode7 range 13 and median 12.
1. 8 answers
2. asked by Anonymous
3. 1,071 views
A driver in a car traveling at a speed of 21.8m/s see a cat 101m away on the road. How long will it take for the car to
1. 2 answers
2. asked by Ruth
3. 1,059 views
A man measures the acceleration of an elevator using a spring balance. He fastens the scale to the roof, and suspends a mass
1. 0 answers
2. asked by Bianca
3. 1,044 views
What is Dell’s strategy for success in the marketplace? Does the company rely primarily on a customer intimacy, operational
1. 1 answer
2. asked by felisha
3. 1,038 views
A block of mass 3.90 kg is pushed 3.80 m along a frictionless horizontal table by a constant 16.0 N force directed 24.0° below
1. 1 answer
2. asked by gabe
3. 1,033 views
On an open-reel tape deck, the tape is being pulled past the playback head at a constant linear speed of 0.372 m/s.(a) If the
1. 0 answers
2. asked by Jordan
3. 1,031 views
A chair lift holding a 100 kg man rises 5 meters in height in 10 second time period. Ignore the weight of the chair and related
1. 0 answers
2. asked by love
3. 1,017 views
it takes 1 cup of liqiud fertilizer to make 7 1/2 gallons of spray. How much liquid is needed to make 80 gallons of spray?
1. 1 answer
2. asked by Nick
3. 1,006 views
HIO3 + FeI2 + HCl --> FeCl3 + ICl(in acidic solution) Show and label the two balanced half-reactions (oxidation and reduction).
1. 2 answers
2. asked by jillian
3. 1,005 views
1) A 25mL sample of the .265M HCI solution from the previous question istitrated with a solution of NaOH. 28.25mL of the NaOH
1. 5 answers
2. asked by Jessica
3. 1,000 views
A. Use the relation 2m m m GM g R ƒ to find the acceleration due to gravity on the surface of the Moon. You can use the
1. 1 answer
2. asked by Anonymous
3. 991 views
state one effect of an increasing level of TSH-releasing factor
1. 1 answer
2. asked by Shiane
3. 985 views
Write net ionic equation for all the reactions that occurred with the metals.Cu(s) with Ag+ Pb(s) with Cu2+(aq) thank you
1. 1 answer
2. asked by thomas richards
3. 981 views
how many grams of potassium bromide could be recovered by evaporating 650 grams of 15 perentKBr solution to dryness......650 *
1. 1 answer
2. asked by Pierre
3. 980 views
If t multiplied by the sum of x and 2y is divided by 4y, what is the result?
1. 1 answer
2. asked by Gabby
3. 974 views
Consider the function f(x) = x/(x-1)Are there any turning points? Explain how this could help you graph f(x) for large values of
1. 2 answers
2. asked by Anonymous
3. 964 views
A heavy freight train has a mass of 14000 metric tons. If the locomotive can pull with a force of 645000 N, how long does it
1. 0 answers
2. asked by Bala
3. 952 views

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