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2011
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Questions Asked on April 17, 2011

Which of the following is an acid base reaction?C(s) + O2(g) → CO2(g) MgSO4(aq) + Ba(NO3)2(aq) → Mg(NO3)2(aq) + BaSO4(s) 2
1. 3 answers
2. asked by yr
3. 6,927 views
A rectangular box without a lid is to be made from 12 square meters cardboard. Find the maximum volume of such a box.
1. 2 answers
2. asked by daniel
3. 6,791 views
Please Help!!!A 920 kg sports car collides into the rear end of a 2300 kg SUV stopped at a red light. The bumpers lock, the
1. 4 answers
2. asked by Brittney
3. 3,862 views
A buffer is prepared by mixing 45.0 mL of 0.15 M NaF to 35.0 mL of 0.10 M HF (Ka = 6.8x10^-4) Calculate the pH of this buffer
1. 1 answer
2. asked by Sam
3. 2,531 views
A) If a regression experiment has correlation coefficient r= 0.75, what precent of total variation is explained by the
1. 2 answers
2. asked by SROBSON
3. 2,392 views
what is an example of alliteration in animal farm? please give the chapter number-thank you!!!
1. 3 answers
2. asked by izzy
3. 2,382 views
please help me? :)topic: standard enthalpies of formation "Calculate ΔHf° of octane, C8H18(l), given the entalpy of combustion
1. 1 answer
2. asked by marie
3. 2,300 views
John drives to work each morning and the trip takes an average of  = 38 minutes. The distribution of driving times is
1. 1 answer
2. asked by karla
3. 2,087 views
if some volatile impurities in the crucible are not burned off in step 1 but are removed in step 4 is the reported percent mass
1. 2 answers
2. asked by Mary
3. 2,056 views
The length of time (T) in seconds it takes the pendulum of a clock to swing through one complete cycle is givenby the formula
1. 1 answer
2. asked by Carolyn
3. 2,002 views
A lottery game asks you to pick 5 numbers from the set 1, 2, 3, ... , 29, 30. How many ways are there to play this lottery game?
1. 4 answers
2. asked by BreAnna
3. 2,002 views
When electricity is applied to a molten binary salt, the cation will be reduced and the anion will be oxidized. The electrolysis
1. 3 answers
2. asked by Anonymous
3. 1,987 views
According to the following reaction, how many moles of Fe(OH)2 can form from 175.0 mL of 0.227 M LiOH solution? Assume that
1. 1 answer
2. asked by yr
3. 1,892 views
balance the redox equations:IO3-(aq) -> I2(aq) and I-(aq) -> I2(aq) balance the redox equation: S2O3(-2) -> S4O2(2-) and I3- ->
1. 1 answer
2. asked by Jake
3. 1,872 views
An equilibrium mixture of the following reaction was found to have [COF2] = 0.255 M and [CF4] = 0.118 M at 1000°C. What is the
1. 1 answer
2. asked by Rachel
3. 1,732 views
Why do many musicians wear earplugs during their performances even though the intensity of the sounds produced is lower than the
1. 2 answers
2. asked by ashley --
3. 1,696 views
A cube has edge lengths of 6 inches. What is the approximate length of a diagonal "d" of the cube?A)6 in. B)8.4 in. C)10.4 in.
1. 2 answers
2. asked by Sergio
3. 1,638 views
Acetylene (C2H2) and hydrogen fluoride (HF) react to give difluoroethane:C2H2+2HF->C2H4F2 When 2.3 mol of C2H2 and 12 mol HF are
1. 1 answer
2. asked by Dewey
3. 1,536 views
A cake of soap placed in a bathtub of water sinks. The buoyant force on the soap is:a- Zero b- Less than its weight c- Equal to
1. 1 answer
2. asked by DMITRIC
3. 1,462 views
how many iron atoms are in 0.550 mol of Fe2O3?
1. 2 answers
2. asked by lizzy
3. 1,342 views
C6H12O6= 2C2H5OH + 2CO2 WITH 1KG OF GLUCOSE, WHAT IS THE MAX AMOUNT OF ETHANOL (INGRAMS OR LITERS) THAT CAN BE OBTAINED BY THE
1. 1 answer
2. asked by DANA
3. 1,332 views
Fe2O3 + 3CO= 2Fe + 3CO2, SUPPOSE THAT 1.64kg OF Fe ARE OBTAINED FROM A 2.62kg SAMPLE OF Fe2O3(ORE). ASSUMING THE REACTION IS
1. 2 answers
2. asked by BECKY
3. 1,323 views
What are the first, second, and third frequencies audible from a 20 cm long organ pipe when (A) only one end is open and when
1. 2 answers
2. asked by ashley --
3. 1,298 views
Calculate the lattice energy of potassium oxide from the following data:Enthalpy of sublimation of potassium: +89.24 kJ/mol Bond
1. 0 answers
2. asked by Joanie
3. 1,280 views
What would be the best technique to separate a soluble solid from a solution, like separating salt from a mixture of salt water?
1. 1 answer
2. asked by Ashley
3. 1,241 views
Using either full block or modified block, draft a letter to Mr. Dittmer to set up the seminar. Your letter must have at least
1. 0 answers
2. asked by jacqui
3. 1,220 views
George Wilkins checked the spreadsheet where he keeps track of his assets and liabilities. He discovered that (i) he owes
1. 1 answer
2. asked by Susana
3. 1,214 views
Let A={0,1,2,3,4}. Define a function f from A to A by f(n)=2n mod 5.a/ Is f one-to-one? b/ Is f onto? Could you show me how to
1. 4 answers
2. asked by yengiang
3. 1,181 views
I have to write a dumb dinosaur story.The textbook says you'll need to invent a way for humans to enter the story, but that's
1. 3 answers
2. asked by surfsupmel
3. 1,160 views
A hexane solution contains as impurities 5.2% (by mass) hepatne and 2.9% (by mass) pentane. Calculate the mass of each component
1. 4 answers
2. asked by Pat
3. 1,153 views
Assume that 25% of the student body at your school is male and that 40% of the students walk to school. If a student from this
1. 0 answers
2. asked by Cassidy
3. 1,137 views
A mass of 0.116 kg hangs from a vertical spring in the lab room. You pull down on the mass and throw it vertically downward. The
1. 0 answers
2. asked by Chris
3. 1,135 views
I keep getting the wrong answer...A solar model is used to calculate the expected temperature and density at all depths within
1. 2 answers
2. asked by Misty
3. 1,126 views
19.2 mL H2SO4 solution (d = 1.727 g/mL, 80.0 percent H2SO4 by mass)____ mol
1. 1 answer
2. asked by Dewey
3. 1,109 views
Explain why methanol spontaneously evaporates in open air at 25.0 .I know that a negative delta G means a spontanious reaction,
1. 0 answers
2. asked by redgy
3. 1,102 views
Professor does not teach from a book so am not sure how to apply this problem to the regression equation.Thanks in advance.
1. 2 answers
2. asked by SROBSON
3. 1,082 views
I really have the following doubts. Can you see if my corrections are OK? Thank you.1) He is expected by his friends (is wrong?)
1. 1 answer
2. asked by Mike1
3. 1,079 views
Suppose that 62 percent of the people who are murdered actually knew the person who committed the murder. Suppose that a
1. 1 answer
2. asked by Brenda
3. 1,049 views
Benner imports Inc, an automobile dealership, placed an advertisemet in the chicago sun times to sell a station wagon. The
1. 0 answers
2. asked by Sarah
3. 1,046 views
A helium atom weighs 6.65 X 10 to the negative 24 grams. How many helium atoms are contained in a 1.0 g sample?
1. 1 answer
2. asked by Lindsey
3. 1,029 views
Two cards are drawn at random from a standard 52-card deck of playing cards without replacement. Find the probability that the
1. 2 answers
2. asked by Terry
3. 1,019 views
fill in the blanks with appropriate (suitable)determiners 1.he did seem to have read----scriptures. 2.as----youth i had to work
1. 2 answers
2. asked by mayank
3. 1,007 views
I’m using VB 2008. I need towrite a simple program that calculates total sales of purchases. The program should accept item
1. 1 answer
2. asked by Brenda
3. 998 views
Which molecule or compound below contains a polar covalent bond?Student Response A. NCl3 B. C2H4 C. ZnS D. AgCl E. LiI
1. 2 answers
2. asked by candy
3. 968 views
I'm having trouble with the following question, any help would be greatly appreciated.A voltaic cell consists of a Zn/Zn^2+
1. 3 answers
2. asked by Rick
3. 951 views
I still have a few doubts on the use of "earlier". I included other five sentences I'm really doubtful about1) Can't you say:
1. 2 answers
2. asked by Mike1
3. 949 views
Consider a single photon of red laser light, with wavelength of 633 nm (nano is 10-9).What energy does this carry? What
1. 1 answer
2. asked by maggie
3. 917 views
An equilibrium mixture of the following reaction was found to have [H2] = 0.020 M and [I2] = 0.020 M at 340°C. What is the
1. 2 answers
2. asked by Rachel
3. 894 views
How total was the transformation brought about by the industrial revolution?
1. 1 answer
2. asked by Pat
3. 873 views
Education in financial planning teaches (simple present tense) me how to save money for my children’s college education.Could
1. 1 answer
2. asked by Help
3. 858 views
A lottery is set up in which players pick six numbers from the set 1, 2, 3, ... , 39, 40. How many different ways are there to
1. 1 answer
2. asked by BreAnna
3. 847 views
what is an example of a hyperbole (with the chapter number) in animal farm
1. 1 answer
2. asked by jamie
3. 843 views
Ok, so here's my question:If exactly 14.563 grams of KMnO4 were dissolved to yield 750 mL of solution waht would be the
1. 2 answers
2. asked by Tichele
3. 832 views
Example: Sulfur TrioxideChemical formula: SO3 Valence e-: ? Needed e-: ? Difference/Bond: ?? Please help me!
1. 1 answer
2. asked by Toni Jones
3. 824 views
Suppose that more than a decade ago high levels of lead in the blood put 81 percent of children at risk. A concerted effort was
1. 0 answers
2. asked by Brenda
3. 817 views
An amount of $3000 was deposited in a bank at a rate of 2% annual interest compounded quarterly for 3yrs. The rate then
1. 1 answer
2. asked by yenny
3. 807 views
Using the following values, calculate the amount accumulated (future value):Initial Principal = $9000 Interest Rate = 8% Number
1. 5 answers
2. asked by mike...
3. 788 views
A small fly of mass 0.26 is caught in a spider's web. The web vibrates predominately with a frequency of 4.6 .a)What is the
1. 1 answer
2. asked by JoseCuervo
3. 754 views
The input piston of a hydraulic press is 20mm in diameter, and the output piston is 10mm in diameter. an input force of 1.0N
1. 0 answers
2. asked by DMITRIC
3. 748 views
A 920 kg sports car collides into the rear end of a 2300 kg SUV stopped at a red light. The bumpers lock, the brakes are locked,
1. 1 answer
2. asked by Brittney
3. 737 views
A project cost $1 million and has a base-case NPV of exactly zero (NPV = 0). What is the projects' APV in the following cases?a.
1. 0 answers
2. asked by Big TEE
3. 736 views
In a room that is 2.78 m high, a spring (unstrained length = 0.30 m) hangs from the ceiling. A board whose length is 1.94 m is
1. 0 answers
2. asked by isabel
3. 723 views
For a project im writing about 1950's food and the food that was unique to that time. But, in my report i also have to compare a
1. 1 answer
2. asked by Hannah
3. 715 views
Decide whether the experiment is a binomial, Poisson, or neither based on the information given. Each week a man plays a game in
1. 1 answer
2. asked by glo
3. 708 views
I need help on this question:day 7 assignment: Gang development and Control write a 400-600 word response paper discussing the
1. 3 answers
2. asked by paula
3. 707 views
Hydrogen and carbon dioxide react at a high temperature to give water and carbon monoxide.H2(g) + CO2(g) --> H2O(g) + CO(g) (b)
1. 0 answers
2. asked by Rachel
3. 699 views
Thank you very much for explaining to me the best choice.I still have a few sentences I'm doubtful of. I included 7 doubts using
1. 1 answer
2. asked by Mike1
3. 691 views
Check my answer please?Yuri is wrapping presents. The first box measures 9 inches by 12 inches by 2 inches. He has a second box
1. 1 answer
2. asked by Sammy
3. 691 views
the growth in population of a small town since 1996 is given by the function P(n)=1250(a.03)^nc) determine the poulation in the
1. 0 answers
2. asked by Navroz
3. 689 views
What concentration of competitive inhibitor is required to yield 75% inhibition at a substrate concentration of 1.5x10-3 if
1. 0 answers
2. asked by Bradley
3. 685 views
. George Wilkins checked the spreadsheet where he keeps track of his assets and liabilities. He discovered that (i) he owes
1. 1 answer
2. asked by Susana
3. 677 views
let f(x)=x^3(e^-x)Answer using calculus, use graphing calculator only to check work. a) Find the local and global extrema of f.
1. 0 answers
2. asked by Janet
3. 663 views
1. A sound is made by a speaker, which then radiates in all directions. The sound waveis described by A(r) sin(2r - 600t) where
1. 1 answer
2. asked by kelsey
3. 662 views
36.85 mL of a KMnO4 solution when acidified reacted with 1.076g of Mohr's salt, Fe(NH4)2(SO4)2 x 6H2O What is the normality of
1. 2 answers
2. asked by Tichele
3. 661 views
A florist has access to 9 types of flowers and 8 types of foliage. He makes bouquets using 4 types of flowers and 3 types of
1. 3 answers
2. asked by Meghan
3. 649 views
A certain star is 10.9 light-years away. How long would it take a spacecraft traveling 0.960c to reach that star from Earth, as
1. 0 answers
2. asked by iqra
3. 647 views
I have a take home test I am working on. Any help would be appreciated. Professor does not teach from a book so am not sure how
1. 0 answers
2. asked by SROBSON
3. 638 views
Compound A reacts with element B (a halogen) to form compounds C and D as the only products. When 2.000 grams of B react with an
1. 1 answer
2. asked by Patrick
3. 638 views
the perimeter of some traffic sign must be 128 inches the length is 14 inches longer than its width
1. 2 answers
2. asked by tracie
3. 634 views
I have project i need your help.this is the Project Description In this project, you will design a complete arithmetic unit of a
1. 1 answer
2. asked by Sara
3. 633 views
Put the equation in the form ax2 + bx + c = 0. Enter exponents using the caret ( ^ ). For example, you would enter 4x2 as 4x^2.8
1. 1 answer
2. asked by miranda
3. 630 views
A buffer was made by mixing 0.1522 moles of HCO2H with 0.1832 moles LiHCO2- and diluting to exactly 1L. What will be the pH
1. 1 answer
2. asked by Jude
3. 621 views
How do I calculate the solubility of a compound in grams of solute per 100 grams of solution?
1. 1 answer
2. asked by Matt
3. 618 views
I’m using VB 2008. I need towrite a simple program that calculates total sales of purchases. The program should accept item
1. 0 answers
2. asked by Brenda
3. 617 views
I urgently need to revise these questions. I don't know how to express questions number 1 and 4. Thank you1) Refer to Owen’s
1. 1 answer
2. asked by Mike1
3. 617 views
Sara invested money at a bank that paid 3.5% annual interest compounded quarterly. If she had $4650 at the end of 4 yr what was
1. 1 answer
2. asked by yenny
3. 617 views
What is the critical z used to form a 85% confidence interval?
1. 1 answer
2. asked by Heaven
3. 601 views
a non uniform rod ab of length 4 m and mass 5 kg is in equilibrium in horizontal position resting on two supports at point C and
1. 0 answers
2. asked by sufyaan
3. 600 views
I am a Sophomore in High School. I have a GPA of 3.3 currently, (it's very bad) with no AP classes taken until Junior and Senior
1. 2 answers
2. asked by William
3. 598 views
I forgot to add these other questions. Could you please check questions 1,3 and 5 (I'm most doubtful of).1) Focus your attention
1. 1 answer
2. asked by Mike1
3. 597 views
If 237 mL of O2, measured at STP, are obtained by the decomposition of the KClO3 in a 5.44 g mixture of KCl and KClO3,2KClO3(s)-
1. 2 answers
2. asked by Sam
3. 595 views
What are the boiling point and freezing point of a 0.22 m solution of sucrose in ethanol?Can someone help me with this quickly?
1. 1 answer
2. asked by Hai
3. 590 views
Can you please tell me if the following sentences have the same meaning (sentence 1)?I included other doubts. Thank you 1) Do
1. 1 answer
2. asked by Mike1
3. 589 views
I posted a question similar to this one a few days ago and someone helped me with it. but now im on a similar one and i did the
1. 2 answers
2. asked by Rebekah
3. 588 views
1)A lottery is set up in which players pick six numbers from the set 1, 2, 3, ... , 39, 40. How many different ways are there to
1. 1 answer
2. asked by BreAnna
3. 587 views
What is the concentration of Ni2+ in 0.0775M Ni(NO3)2 and 1.3981M NH3
1. 1 answer
2. asked by Jude
3. 582 views
A diesel engine works at a high compression ratio to compress air until it reaches a temperature high enough to ignite the
1. 1 answer
2. asked by help me please Urgetnt
3. 578 views
An empty sandbox has a length of 6 feet width of 4 feet and a depth of 2 feet. If the sandbox is filled with 8 bags of sand and
1. 1 answer
2. asked by Helpplz
3. 572 views
Education in financial planning had opened (past perfect tense) my eyes to better money management.Financial planning education
1. 1 answer
2. asked by Com 155
3. 570 views
which is the formula that describes process to transform Fe3+ to Fe2+ thanks to HCl in the stomach?
1. 1 answer
2. asked by Lucia
3. 570 views

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