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Questions Asked on March 27, 2010

The equation for the complete combustion of ethene (C2H4) isC2H4(g) + 3 O2(g) ==> 2CO2(g) + 2H2O(g) If 2.70 mol C2H4 is reacted
1. 3 answers
2. asked by Danny
3. 9,239 views
Solve an equilibrium problem (using an ICE table) to calculate the pH.a solution that is 0.205 M in CH3NH2 and 0.110 M in
1. 2 answers
2. asked by Kyle
3. 8,966 views
A small piece of cork in a ripple tank oscillates up and down as ripples pass it. If the ripples travel at 0.20m/s, have a
1. 5 answers
2. asked by Edwin
3. 4,375 views
the expression cos4x cos3x + sin4x sin3x is equivalent towhich one of the following is the answer: 1) sinx 2) sin7x 3) cosx 4)
1. 4 answers
2. asked by Rony
3. 3,972 views
A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The
1. 4 answers
2. asked by Edwin
3. 3,113 views
Express the function in the formf(x) = (x-k)q(x) + r for the given value of k. f(x) = 15x^4 + 10x^3 - 6x^2 + 14 Value of k =
1. 5 answers
2. asked by Abbey
3. 2,429 views
An open tank holds water 1.25 m deep. If a small hole of cross section area 3cm^2 is made at the bottom of the tank, calculate
1. 3 answers
2. asked by Edwin
3. 2,329 views
The great galaxy in Andromeda has an angular diameter along its long axis of about 5 degree. Its distance is about 2.2 millons
1. 2 answers
2. asked by b
3. 1,928 views
When solid NH4HS is placed in a closed flask at 28 C, the solid dissociates according to the equation:NH4HS(s) <=> NH3(g) +
1. 1 answer
2. asked by ami
3. 1,886 views
Q.1 What will be the pH at the equivalence point during the titration of a 100 ml 0.2M solution of CH3COONa with 0.2M of
1. 1 answer
2. asked by gaurav
3. 1,883 views
Which of the following is true of the Encrypting File System (EFS)?a. The Encrypting File System provides encryption for data
1. 1 answer
2. asked by John
3. 1,881 views
To measure the height of an inaccessible cliff on the opposite side of a river, a surveyor makes the measurements shown in the
1. 1 answer
2. asked by Thank You For The Help
3. 1,726 views
What is the percent yield if 4.65g of copper is produced when 1.87g of aluminum reacts with an excess of copper(II) sulfate?2Al(
1. 1 answer
2. asked by Keith
3. 1,673 views
Microwave ovens use microwave radiation to heat food. The microwaves are absorbed by moisture in the food, which is transferred
1. 1 answer
2. asked by andrea
3. 1,656 views
A farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum
1. 5 answers
2. asked by Terri
3. 1,638 views
How many grams of Ba(IO3)2 can be dissolved in 500 mL of a 0.100 M KIO3 solution at 25 oC? Use activities for this calculation.
1. 3 answers
2. asked by Annabelle
3. 1,531 views
A circle has a radius of 4 inches. In inches, what is the length of the arc intercepted by a central angle of 2 radians?which of
1. 1 answer
2. asked by Rony
3. 1,529 views
If you have a grade average at 50% and you score 89% percent on a test what does your grade equal out to?
1. 3 answers
2. asked by tarra
3. 1,526 views
Predict the products and write a net ionic reaction for the reaction of cadmium chloride and ammonium sulfide.
1. 1 answer
2. asked by Mary
3. 1,518 views
Prove that tan4x=(4tanx-tan^3x)/(1-6tan^2 x+tan^4 x)*note: the exponents are just numbers. there are no variables in the
1. 2 answers
2. asked by Anne
3. 1,456 views
If a nickel contains 3.9 gram of copper and 1.2 gram of nickel How many kilograms of copper must be combines with 500 kilograms
1. 1 answer
2. asked by Heather
3. 1,251 views
A plumber needs four sections of pipe 2 7/8feet long. Can this be cut from a 12 foot section? If so, how much pipe will be left
1. 2 answers
2. asked by Kirk
3. 1,207 views
Entropy of meltingA block of a certain substance (m = 0.3 kg) sits in a cold room at its melting point 170 K. A lab demonstrator
1. 1 answer
2. asked by michael
3. 1,134 views
Alcohol levels in blood can be determined by a redox titration with potassium dichromate according to the balanced equation:C2H5
1. 4 answers
2. asked by Mary
3. 1,127 views
(a) What is the tangential acceleration of a bug on the rim of a 6.0 in. diameter disk if the disk moves from rest to an angular
1. 3 answers
2. asked by Kelsey
3. 1,089 views
The source of magnetism isA)polarization B)magnetic monopoles C)electrons D)protons
1. 1 answer
2. asked by Kim Love
3. 1,087 views
When you balance equations, do you treat polyatomic ions as one unit or treat the different elements in the ion separately?
1. 2 answers
2. asked by Emily
3. 1,069 views
HeyI'm lost on this physics problem can anyone tell me which equations i'm suppose to use in these questions a) A skier inhales
1. 0 answers
2. asked by Andrew
3. 1,057 views
why are farmers today not as tightly bound by geography and climate as they were in the past
1. 1 answer
2. asked by jane
3. 1,053 views
A car initially traveling at 31.0 m/s undergoes a constant negative acceleration of magnitude 2.00 m/s2 after its brakes are
1. 1 answer
2. asked by Kelsey
3. 1,047 views
Windows XP Professional can accommodate the addition and removal of many types of devices. The installation of a device results
1. 0 answers
2. asked by John
3. 1,028 views
Simplify-9[-15-(45-12)]=
1. 2 answers
2. asked by KiKi
3. 1,018 views
A special prototype model aeroplane of mass 400g has a control wire 8cm long attached to its body. The other end of the control
1. 3 answers
2. asked by Edwin
3. 1,000 views
The refractive index of a material is different for different wavelengths and colours of light. For most materials in the
1. 4 answers
2. asked by Sandra
3. 994 views
j=6.50%m=Daily(365) f(effective rate)=? f=(1+i)^n =(1+(.0650/365))^365 =1.067152848-1 =0.067152848 =6.72% i know how to find the
1. 3 answers
2. asked by Amy
3. 984 views
In 1992, the life expectancy of males in a certain country was 73.5 years. In 1996, it was 75.7 years. Let E representthe life
1. 2 answers
2. asked by KiKi
3. 967 views
Mary brought home 1/2 dozen eggs. He accidently dropped the carton on the flor and 1/3 of the eggs broke. How many eggs does she
1. 3 answers
2. asked by Rene
3. 949 views
A bicycle wheel has a radius R = 32 cm and a mass M = 1:80 kg which you may assume to beconcentrated on the outside radius.
1. 1 answer
2. asked by claudia
3. 940 views
water flows along a horizontal pipe of cross-sectional area 48cm^2 which has a constriction of cross-sectional area 12cm^2 at
1. 0 answers
2. asked by Edwin
3. 937 views
what sre the landforms, climate, and vegetation of the baltic coast?
1. 1 answer
2. asked by terry
3. 927 views
Consider the following equilibrium:5.0 moles of are placed in a 10.0 L flask at 200 C and allowed to come to equilibrium.
1. 4 answers
2. asked by ami
3. 892 views
give exact and approximate solutions to three decimal places(x-5)sq = 18
1. 1 answer
2. asked by Jerry
3. 858 views
A converging thin lens made out of crown glass (n=1.52) has a focal length f=1.0m An identical lens (same radius for the
1. 2 answers
2. asked by mm
3. 857 views
particle 1 of mass m1 = 0.29 kg slides rightward along an x axis on a frictionless floor with a speed of 1.8 m/s. When it
1. 2 answers
2. asked by beav
3. 843 views
Use synthetic division to show that x is a solution of the third-degree polynomial equation, and use the result to factor the
1. 1 answer
2. asked by Abbey
3. 821 views
find, to the nearest minute, the angle whose measure is 3.45 radians.
1. 3 answers
2. asked by Rony
3. 817 views
0.12 g of rock salt(NaCl and impurities) was dissolved in water and titrated with 0.1 M silver nitrate. 19.7 mL was required to
1. 1 answer
2. asked by Mary
3. 815 views
Suppose that large dogs weights are normally distributed with a mean of 100 pounds and a standard deviation of 10 pounds. If one
1. 1 answer
2. asked by Anonymous
3. 799 views
A light bulb radiates most strongly at a wavelength of about 3000 nanometers. How hot is its filament?
1. 2 answers
2. asked by b
3. 786 views
PCl3 + Cl2 = PCl5 Kc=26 @ 250 degree Celcius1.0 mol of PCl3 , 1.0 mol of Cl2 , and 5.0 mol of PCl5 are placed in a 10.0L flask
1. 2 answers
2. asked by ami
3. 769 views
What is the primary basis for differentiating the Eras?
1. 2 answers
2. asked by Abbey
3. 737 views
Rita lleva al aeroporta y tambien lleva a Tomás.I don't understand what is meant by this sentence. Lleva means he or she
1. 2 answers
2. asked by Jean
3. 731 views
(tanx+cotx)over(tanx-cotx)=(1) over sin^2x-cos^2x)
1. 1 answer
2. asked by stacey graham
3. 726 views
If the relative humidity is 66.8% in the middle of a spring day in auckland when the temperature is 15 degrees celsius, What
1. 1 answer
2. asked by Steve
3. 713 views
What do you think about the movie.1. I thought it was really fun. 2. I thought it was real fun. 3. I thought it was really
1. 5 answers
2. asked by rfvv
3. 700 views
I am trying to do a definition paragraph and was wondering if this would be good on A FRIEND TO ALL topic. please help.A friend
1. 2 answers
2. asked by deborah
3. 698 views
. John, Lesa, and Trevor form a limited liability company. John contributes 60% of the capital, and Lesa and Trevor each
1. 1 answer
2. asked by Anonymous
3. 691 views
At October 31, Nathan Company made an accrued expense adjusting entry of $1,400for salaries. Prepare the reversing entry on
1. 0 answers
2. asked by Julia
3. 682 views
A 14.5metal wire is cut into three equal pieces that are then connected side by side to form a new wire the length of which is
1. 1 answer
2. asked by Anonymous
3. 674 views
1. Why do you not like becoming a journalist?Because I want to become an office worker. 2. Why don't you not like becoming a
1. 1 answer
2. asked by rfvv
3. 664 views
Wave amplitude is related toA)wave velocity B)frequency C)energy D)wavelength
1. 0 answers
2. asked by Kim Love
3. 654 views
The ratio of boys to girls in Mr. Joiner’s class is 5 to 7. If there are 15 boys in the class, how many totalstudents are in
1. 6 answers
2. asked by Kirk
3. 652 views
A small fish is inside a spherical bowl filled with water (n=1.33). The bowl has a diameter of 30cm and the fish is at a
1. 0 answers
2. asked by mm
3. 647 views
How does the molar mass of molecules affect the boiling points?e.g MOlar masses HI-->127.9 HF--->20.07 HCl---> 36.45 Boling
1. 1 answer
2. asked by LALA
3. 640 views
find the net force produced by a 40 Newton force and a 50 Newton force in each of the following cases:Both forces act in the
1. 1 answer
2. asked by natasha
3. 638 views
A small fish is inside a spherical bowl filled with water (n=1.33). The bowl has a diameter of 30cm and the fish is at a
1. 0 answers
2. asked by Sandra
3. 637 views
methyl red has the following color changes red 4.2 -8.3 yellowa)write the ionic equilibrium equation b) If a small quantity of
1. 1 answer
2. asked by maya
3. 634 views
Show that a force acting along a given line can always be replaced by a force of the same magnitude acting along a parallel
1. 0 answers
2. asked by Edwin
3. 631 views
The diffusion coefficient for calcium ions crossing a biological membrane 10nm thick is 300 micrometers squared/second and the
1. 1 answer
2. asked by Kelly
3. 629 views
In 1992, the life expectancy of males in a certain country was 73.5 years. In 1996, it was 75.7 years. Let E representthe life
1. 0 answers
2. asked by KiKi
3. 629 views
The equation y = -1777x+27153 can be used to predict the number y of gun deaths in the United States x years after 20000, that
1. 1 answer
2. asked by KiKi
3. 626 views
Are fat fish more likely to have broad stripes than thin fish?7. Answers: Yes No 8. Reasons: Some fat fish have broad stripes
1. 0 answers
2. asked by Gina
3. 626 views
From a point on the ground a person notices that a 110-ft tree on top of a hill subtends an angle of 3°. If the angle of
1. 0 answers
2. asked by smith
3. 624 views
Find the standard deviation using the rule of thumb for each of the data sets57,61,57,57,58,57,61 61,52,69,64,46,54,47
1. 3 answers
2. asked by shelly
3. 611 views
j=6.50%m=Daily(365) f(effective rate)=? f=(1+i)^n =(1+(.0650/365))^365 =1.067152848-1 =0.067152848 =6.72% i know how to find the
1. 1 answer
2. asked by Amy
3. 610 views
How do you pronounce 'Eminem'? Is it a male name or a female name?
1. 1 answer
2. asked by rfvv
3. 600 views
I am currently outside USA. Now in Asia we follow the Cambridge igcse curriculum. If I move to USA can I still get into an Ivy
1. 1 answer
2. asked by Amir
3. 576 views
Media Services charge $20 for a phone and $30/month for its economy plan. The equation C=30t +20 describes the total cost, C of
1. 1 answer
2. asked by KiKi
3. 570 views
A steam turbine operates between hot and cold reservoir temperatures of 538.0 ¢XC and 92.1 ¢XC, respectively. If heat is
1. 2 answers
2. asked by melvin
3. 569 views
When astronauts travel into space, they can still see Earth and the moon. why is this possible?A. The sun shines in the windows
1. 0 answers
2. asked by Anonymous
3. 569 views
In the design of a passenger bus, it is proposed to derive the motive power from the energy stored in a flywheel. The flywheel,
1. 0 answers
2. asked by Edwin
3. 564 views
solve the equation2 tan^2(theta)sin(theta)-tan^2(theta)=0 interval[0,360)
1. 1 answer
2. asked by stacey graham
3. 560 views
divide by long division.divide x^3 + 4x^2 - 3x - 12 by x^2 - 3
1. 2 answers
2. asked by Abbey
3. 553 views
what is the chance of getting the same number twice in a row, if there are 1000 numbers to draw from. what is the formula for
1. 1 answer
2. asked by steve
3. 551 views
A 14.5metal wire is cut into three equal pieces that are then connected side by side to form a new wire the length of which is
1. 0 answers
2. asked by Anonymous
3. 550 views
A beam of electromagnetic waves of a wavelength 3.0cm is directed normally at a grid of metal rods, parallel to each other and
1. 0 answers
2. asked by Edwin
3. 549 views
What was the human hisory between North American Asia Eurasia and Europe before the 1450's?
1. 2 answers
2. asked by Jamal
3. 548 views
You have to design a buffer based on one of the systems belowSystem 1: HA1 and A1-1 K= 4 E-3 System 2: HA2 and A2-1 K= 5 E-4
1. 1 answer
2. asked by maya
3. 544 views
What is the definition of Gestalt theory, and whats the main facts about it?
1. 4 answers
2. asked by Jon
3. 537 views
Given that a measures 25.1 mm, x measures 51.2 mm and angle b measures 82°, find the length of y -
1. 1 answer
2. asked by TT
3. 534 views
· Post your response to the following: Reflect on your own worldview and compare it with the worldviews presented in the text.
1. 1 answer
2. asked by Kay
3. 531 views
How does the law of large numbers affect you as a gambler in a casino? As the owner of the casino? Why do people still patronize
1. 1 answer
2. asked by Liz
3. 530 views
Figure the mean, median and standard deviation for the number of words learned by seven infants. I beleive the mean is 45.5 and
1. 1 answer
2. asked by Tammy
3. 530 views
The precession of the Earth its causes, and its ramifications
1. 2 answers
2. asked by b
3. 526 views
Consider the equilibrium of water with gaseous hydrogen and oxygen:Give the value of for this reaction, if it is written as:
1. 3 answers
2. asked by ami
3. 522 views
There are 1000 students in the University of A. A sample of 10 observations was obtained regarding the rating of the service
1. 0 answers
2. asked by JL
3. 521 views
The smallest object visible to the unaidedeye is of 100 microns. If you use a microscope of m=1000, what is the size of the
1. 0 answers
2. asked by Jane
3. 515 views
Swan Furnace Cleaners wants to add 0.50% to the effective rate of interest on its credit card. If it currently charges a nominal
1. 3 answers
2. asked by Amy
3. 515 views
which geologic era had the shorest time span and the longest time span?1) Longest = paleozoic 20 shortest = cenozoic Is this
1. 0 answers
2. asked by Abbey
3. 509 views
give the domain of the function and identify any vertical or horizontal asymptotes.g(x)= 1 / x-3 + 1 My answer was x = o and y=3
1. 3 answers
2. asked by Hannah
3. 508 views

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