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Questions Asked on March 22, 2011

The ΔH for the solution process when solid sodium hydroxide dissolves in water is 44.4 kJ/mol. When a 13.9 g sample of NaOH
1. 2 answers
2. asked by Kamila
3. 8,339 views
You are given two waves, a transverse wave that moves to the right f1(x) and a transverse wave that moves to the left f2(x), on
1. 1 answer
2. asked by rama
3. 6,234 views
A bag contains six marbles, of which four are red and two are blue. Suppose two marbles are chosen at random and X represents
1. 2 answers
2. asked by Sean
3. 4,887 views
OOPs i Meant How many grams CaCo3will dissolve on 3.0*10^2mL of 0.050 M Ca(NO3)2? Ksp=8.7*10^-9
1. 1 answer
2. asked by Dom
3. 4,722 views
At the top of a pole vault, an athlete actually can do work pushing on the pole before releasing it. Suppose the pushing force
1. 1 answer
2. asked by blah
3. 4,011 views
Catching a wave, a 77-kg surfer starts with a speed of 1.1 m/s, drops through a height of 1.60 m, and ends with a speed of 8.5
1. 1 answer
2. asked by John
3. 3,713 views
When 90 kJ is removed from a 2-kg copper bar its temperature drops from 200 degrees celcius to 85 degrees celcius what is the
1. 3 answers
2. asked by Brenda
3. 3,235 views
Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide:NH4I(s) ↔ NH3(g) + HI(g) At 400ºC, Kp = 0.215. If 150 g
1. 1 answer
2. asked by Jason
3. 3,142 views
what is the molar solubility of barium fluoride in 0.15M NaF at 25 degrees C?
1. 3 answers
2. asked by roshan
3. 2,998 views
A gas mixture, has a total pressure of 300. Torr and consists of equal masses of Ne and Ar. What is the partial pressure of Ar,
1. 2 answers
2. asked by Kamila
3. 2,908 views
A student earned scores of 85, 83, 90, 94, 88 and 84 on the first six tests in a biology class. What score is needed on the
1. 4 answers
2. asked by Mimi
3. 2,578 views
The temperature of your skin is approximately 35C degrees. What is the wavelength at which the peak occurs in the radiation
1. 2 answers
2. asked by Abby
3. 2,492 views
Your grandparents deposit $1,000 each year on your birthday, starting the day you are born, in an account that pays 6% interest
1. 4 answers
2. asked by Mya
3. 2,340 views
A grasshopper floating in water generates waves at a rate of three per second with a wavelength of two centimeters. (a) What is
1. 1 answer
2. asked by Brenda
3. 2,336 views
What volume would be occupied by 100 g of oxygen gas at a pressure of 1.50 atm and a temp of 25 degrees C.
1. 1 answer
2. asked by Danielle
3. 2,281 views
from the top of a 250 ft lighthouse the angle of depression to a ship in the ocean is 18 degrees. how far is the ship from the
1. 2 answers
2. asked by Tricia
3. 2,262 views
A tennis player places a 58 kg ball machine on a frictionless surface, as shown below. The machine fires a 0.068 kg tennis ball
1. 2 answers
2. asked by Becky
3. 2,188 views
A racing dog is initially running at 20.0 m/s, but is slowing down.Question: How fast is the dog moving when its kinetic energy
1. 1 answer
2. asked by nancy
3. 2,054 views
If the cyclohexane is initially contaminated with a soluble non-reactive, non-volatile substance, will the change in freezing
1. 1 answer
2. asked by Cassie
3. 2,039 views
A slide 2.6 m long makes an angle of 27° with the ground. How high is the top of the slide above the ground?Could someone show
1. 2 answers
2. asked by Kylie
3. 2,037 views
A cannon of mass 200kg, fires a cannonball with a mass of 10kg. The cannon ball leaves the barrel of the cannon with a velocity
1. 3 answers
2. asked by Nelly
3. 1,944 views
the largest a party balloon can get before bursting is 8.23L at 25 degrees celsius and 1.00 atm. supposing you fill the balloon
1. 1 answer
2. asked by Anonymous
3. 1,847 views
1). Assume the following:-the house has 2,000 square feet -80,000 BTU's of heat per sq. foot are required to heat the house for
1. 2 answers
2. asked by Danielle
3. 1,823 views
a 275mL sample of vapor in equilibrium with 1-propylamine at 25C is removed and dissolved in 0.500L of H20. For 1-propalamine,
1. 6 answers
2. asked by kate
3. 1,768 views
A 290 kg piano slides 4.0 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the
1. 5 answers
2. asked by md8
3. 1,583 views
List and compare Kohlberg’s 6 stages of moral development and Piaget’s theory of moral development.
1. 4 answers
2. asked by kelly
3. 1,552 views
Is the old man in "A Very Old Man with Enormous Wings" a flat or a round character? I can't decide. He has some traits but I
1. 2 answers
2. asked by Emily
3. 1,524 views
If a thermometer is miscalibrated to read 1.0 degrees Celsius higher than the actual temperature over its entire scale, will the
1. 2 answers
2. asked by Cassie
3. 1,520 views
how much heat is required to completely vapporize 2.3 grams of ice starting at -50 degrees Celsius? (the specific heat of ice is
1. 1 answer
2. asked by Anonymous
3. 1,440 views
Stuck on this one:find the slope of the line passing through each pair of points or stat that the slope is undefined. assume
1. 2 answers
2. asked by sono
3. 1,423 views
calculate the molar solubility of barium fluoride in water at 25 degrees C. The solubility product constant for BaF2 at this
1. 2 answers
2. asked by roshan
3. 1,395 views
the half life of tritium is 12.5 years. How much of a 1 g sample will remain after 25 years
1. 0 answers
2. asked by Brenda
3. 1,394 views
please, help me.. i think i know the answers, but i just want to make sure! i'd love your feed back :)1) an air bubble is
1. 2 answers
2. asked by sarah
3. 1,384 views
Which is the correct substitute for the underlined words?Hablamos de los príncipes.( los príncipes is underlined). A)éstas
1. 1 answer
2. asked by anon
3. 1,366 views
Which of the following cannot be the lengths of a 30°-60°-90° triangle?A: 10/3, 20/3, 10/3 √3 B: 3, 3/2, 3√3 C: 11, 22,
1. 2 answers
2. asked by Anonymous
3. 1,361 views
Find how many terms has an a.p whose common diffrence and first term are respectively negetive 6 and 8 and the last term is 82.
1. 3 answers
2. asked by Abdul
3. 1,341 views
How many moles of oxygen atoms are contained in 1.86 x 10-2 mol CuSO4·5H2O
1. 1 answer
2. asked by JK
3. 1,333 views
A system delivers 1275 J of heat while the surroundings perform 855 J of work on the system. Calculate ΔU in J.
1. 0 answers
2. asked by Kamila
3. 1,321 views
how much heat is needed to convert 500g of water at 100 degrees C to steam at 100 degrees C?
1. 2 answers
2. asked by t
3. 1,274 views
A student performs an experiment to determine the enthalpy of neutralization of hydrochloric acid and sodium hydroxide. The
1. 1 answer
2. asked by Rachel
3. 1,241 views
The surface areas of two similar figures are given. The volume of the largwe figure is given. Find the volume of the smaller
1. 1 answer
2. asked by Elizabeth
3. 1,232 views
Evaluate each value as a trigonometric function of an angle in Quadrant 1.#1 cos (27pi/8)
1. 1 answer
2. asked by Stephanie
3. 1,211 views
determine the mass of CO2 produced when 76.8g of CaO is reacted with 50.0 g of C acording to the unbalanced equation...CaO + C
1. 1 answer
2. asked by Anonymous
3. 1,196 views
A ship in calm seas steamed 13 km in one direction, turned and steamed 13 km in anotherdirection, and then returned 12 km back
1. 1 answer
2. asked by Brandon
3. 1,195 views
an animal without a backbone is called a what?
1. 4 answers
2. asked by jako
3. 1,182 views
Suppose that these 15 measurements are respectively labeled x1,x2,..,x15. (Thus,-27 is labeled x1,62 is labeled x2,and so on.)Fi
1. 1 answer
2. asked by treshia
3. 1,159 views
Pushing on the pump of a soap dispenser compresses a small spring. When the spring is compressed 0.55 cm, its potential energy
1. 0 answers
2. asked by Alan
3. 1,119 views
The Ethical issues considered important in today's health care organization -- how will ethical issues alter your way of
1. 2 answers
2. asked by Anonymous
3. 1,087 views
Exerting a force of 94 N on the circular piston of a syringe causes a pressure increase in the barrel of 1.3 atm. What is the
1. 2 answers
2. asked by Alexia
3. 1,086 views
Describe and define the types of government that the different city-states chose for themselves. I mean about Crete- Or minoans
1. 2 answers
2. asked by Hayley
3. 1,085 views
The grocery store employs 35 cashiers and grocery baggers altogether. There are 5 cashiers for every 2 grocery baggers. How many
1. 2 answers
2. asked by Johnathan
3. 1,074 views
Len flipped a coin 3 times and got a head each time. What are the chances he will get a tail on his next toss? Explain
1. 1 answer
2. asked by Todd
3. 1,052 views
At an amusement park, a swimmer uses a water slide to enter the main pool.If the swimmer starts at rest, slides without
1. 1 answer
2. asked by Randy
3. 1,043 views
A photon of energy E strikes an electron at rest undergoes pair production, producing a positive electron(positron) and an
1. 0 answers
2. asked by Abby
3. 1,041 views
the solubility of BaF2 is 6.29x10^-3M and the solubility of barium fluoride in 0.15M NaF is 4.4x10^-5M. Compare the solubility
1. 1 answer
2. asked by roshan
3. 1,015 views
The owner of a small hardware store-the only one in a medium –sized town in the mountains-has just learned that a large home
1. 2 answers
2. asked by ak
3. 1,011 views
Erik Johnson has just become a heir to $15 000. He's 23 years old, and hes graduated frm university business program. He works
1. 1 answer
2. asked by Anonymous
3. 998 views
A 57.8 kg pole-vaulter falls from rest from a height of 5.4 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.25 s
1. 1 answer
2. asked by Becky
3. 994 views
to save fuel on the 240 km trip to the cottage, the Nakamura family reduce their usual average speed by 20 km/h. this lengthens
1. 8 answers
2. asked by dawn
3. 993 views
There are three walls in Jordan’s living room. The three walls, shown here, are 12 feet, 9 feet and 10 feet wide,
1. 2 answers
2. asked by Anonymous
3. 993 views
i need help with getting some help with these question on my english homework im looking for immediate & underlying cause for
1. 1 answer
2. asked by anthony
3. 980 views
In a certain reaction 1.5 mol of CO and 1.5 mol of H2O are placed in a 2,0 dm3 sealed vessel. Equilibrium is established at a
1. 0 answers
2. asked by wezile
3. 956 views
500.0 g of ammonia react with 51.0 moles of sulfuric acid to produce ammonium sulfate. How many moles of excess sulfuric acid
1. 1 answer
2. asked by Anonymous
3. 944 views
Application PracticeAnswer the following questions. If appropriate, use Equation Editor to show your work. First, save this file
1. 0 answers
2. asked by ruth
3. 941 views
THREE PAINTINGS ARE SHAPED LIKE AN 8 FOOT SQUARE A 7 FOOT BY 4 FOOT RECTANGLE AND A TRIANGLE AND A TRIANGLE WITH A 6 FOOT BASE
1. 1 answer
2. asked by CINDY
3. 934 views
How many grams will dissolve on 3.0*10^2mL of 0.050 M Ca(NO3)2? Ksp=8.7*10^-9
1. 1 answer
2. asked by Dom
3. 930 views
Write a program that inputs a word representing a binary number (0s and 1s). First, your program should verify that it is indeed
1. 2 answers
2. asked by Andrew
3. 929 views
6. Erin, Patricia and Larry's daughter, is married to Jeff. Jeff was in a serious car accident and needs a transfusion but Erin
1. 0 answers
2. asked by mike
3. 926 views
Consider the reaction:CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) ΔH = - 890.3 kJ What volume of CH4(g) at 25°C and 755 Torr will
1. 1 answer
2. asked by Kamila
3. 913 views
unpaid balance at the end of the 10th year? loan amount of 250,000
1. 0 answers
2. asked by Isabel
3. 912 views
Le Chatelier's principle states that " a dynamic equilibrium tends to respond as to relieve the effect of any change in the
1. 1 answer
2. asked by Babelii
3. 909 views
Can you check these sentences for me, please? Thank you very much.1)He proposes he should pay for the racer himself. 2)She spent
1. 2 answers
2. asked by Mike
3. 893 views
A pure monopolist sells output for $4.00 per unit at the current level of production. At this level of output, the marginal cost
1. 1 answer
2. asked by KP
3. 873 views
In the reaction between H2O2 and I-, 15 mL of 0.30M KI, 65. mL of 0.10M H2O2 and 19 mL of 0.020M Na2S2O3 were mixed in a flask
1. 4 answers
2. asked by Nikita
3. 871 views
Give 2 specific examlples of an organic molecule.I think 2 of them are carbohydrates and proteins.
1. 1 answer
2. asked by sharice
3. 869 views
A cannon tilted up at a 26.0 degree angle fires a cannon ball at 78.0 m/s from atop a 12.0 m-high fortress wall. What is the
1. 1 answer
2. asked by duke
3. 859 views
A container holds 1.00 mol O2, and the pressure in the container is 2.00 atm. A student adds 60.0 g of gas Y to the container.
1. 2 answers
2. asked by Kamila
3. 856 views
The radius R of a sphere is 5.6cm. Calculate the sphere's surface area A.Use the value 3.14, and round your answer to the
1. 1 answer
2. asked by Heather
3. 850 views
can you help me please to differentitae this follows...1.synthetic vs. fabricating process what does it mean please i need your
1. 0 answers
2. asked by jessie
3. 846 views
An airplane can travel 380 miles into the wind in the same time that it can travel 420 miles with the wind. If the wind speed is
1. 3 answers
2. asked by Mikel
3. 841 views
In an experiment we did in class ethanol was poured into a test tube and we noticed that the ethanol did not collect and form a
1. 1 answer
2. asked by cassandra
3. 830 views
The linear absorption coefficient for 0.05 nm x-rays in lead and in iron are respectively, 5.8x10(4) /m and 1.1x10 (4) /m. How
1. 1 answer
2. asked by Jennifer
3. 824 views
I had to make up a conversation between two people ordering in a restaurant-Is this correct?Emily ¿Qué tú deseas comer? Beth:
1. 4 answers
2. asked by BethAnne
3. 818 views
Use mathematical induction to establish the following formula.n Σ i² / [(2i-1)(2i+1)] = n(n+1) / 2(2n+1) i=1 Thanks for any
1. 6 answers
2. asked by Francesca
3. 813 views
Courtney, a sales manager, and her team of six have been assigned the task of developing a marketing strategy for a new software
1. 1 answer
2. asked by shantay
3. 807 views
A 54.0 kg person takes a nap in a (lightweight) backyard hammock. Both ropes supporting the hammock are at an angle of 16.9°
1. 4 answers
2. asked by mike
3. 806 views
In a Styrofoam cup calorimeter, what is the final temperature when 100. g of ironat 100. ° C is added to 100. g of water at 20.
1. 1 answer
2. asked by Kamila
3. 806 views
how is bumping avoided in the preparation of a hot water bath
1. 1 answer
2. asked by Anonymous
3. 806 views
how many ml of 6m hcl aq are required to react with .10g of mg?
1. 1 answer
2. asked by reciee
3. 805 views
a 275mL sample of vapor in equilibrium with 1-propylamine at 25C is removed and dissolved in 0.500L of H20. For 1-propalamine,
1. 2 answers
2. asked by leanna
3. 801 views
11.0 g of aluminum at 200C and 20.0 g of copper are dropped into 54.0 of ethyl alcohol at 15C. The temperature quickly comes to
1. 1 answer
2. asked by Anonymous
3. 795 views
If I had these analogies, which would be the most logical answer?1. Metropolis: necropolis :: a)condominium:cemetery
1. 11 answers
2. asked by Amy
3. 793 views
Find the partial products and the product for 4 x27=?
1. 2 answers
2. asked by BN
3. 784 views
Hello! I am trying to figure out one of the most difficult thing in English - articles. So I have one question:Do we say I'm
1. 5 answers
2. asked by Mark
3. 768 views
Can someone help me factor this problem?Generally I wouldn't have a problem doing it, but today we're supposed to factor
1. 1 answer
2. asked by Anna
3. 767 views
X-rays with an energy of 300 keV undergo Compton scattering from a target.If the scattered x-ray are directed at 30 degrees
1. 3 answers
2. asked by Jennifer
3. 764 views
X-radiation from a molybdenum target (0.626 A) is incident on a crystal with adjacent atomic planes spaced 4.00x10(-10) m apart.
1. 1 answer
2. asked by Vanda
3. 762 views
which suffix means pertaining to conditions present at birth
1. 6 answers
2. asked by olga
3. 761 views
given reaction at equilibrium, if Kp=1.05 at 250 degree celcius, then kc =
1. 1 answer
2. asked by jay
3. 760 views
In Swimming Strokes by Lee Carroll in paragraph 1, how many errors are there in subject-verb agreement, parallelism, and
1. 1 answer
2. asked by becky
3. 746 views

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