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2011
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Questions Asked on March 15, 2011

The heat of combustion of propane is -2,220.1 kJ/molcalculate the heat of formation, delta Hf, of propane given that delta Hf of
1. 3 answers
2. asked by Anonymous
3. 4,765 views
Early one October, you go to a pumpkin patch to select your Halloween pumpkin. You lift the 2.8 kg pumpkin to a height of 1.4 m,
1. 3 answers
2. asked by Alan
3. 4,149 views
A sample of O2(g) is saturated with water vapor at 27 C. The total pressure of the mixture is 772 torr, and the vapor pressure
1. 2 answers
2. asked by naseeb
3. 3,726 views
A 88g arrow is shot from a bow whose string exerts an average force of 110n on the arrow over a distance of 78cm.What is the
1. 2 answers
2. asked by Mark
3. 3,445 views
A hot-air balloon is 180 ft above the ground when a motorcycle passes directly beneath it (travelling in a straight line on a
1. 2 answers
2. asked by Jake
3. 3,371 views
4.72 moles of sulfur trioxide molecules contain how many oxygen atoms?i know the answer is 8.53 x 10^24 but i do know how my
1. 3 answers
2. asked by jessica
3. 2,933 views
calculate the period and frequency of a 3.500 m long pendulum at the following locations:a) the north pole, where acceleration
1. 2 answers
2. asked by giselle
3. 2,877 views
A small plane tows a glider at constant speed and altitude.If the plane does 2.00X10^5 J of work to tow the glider 165 m and the
1. 2 answers
2. asked by Alan
3. 2,779 views
School-age children generally develop writing skills in which sequence?A.Expressive writing,expository writing,story B.Exposity
1. 1 answer
2. asked by kim
3. 2,712 views
Rank these elements according to first ionization energy..I ranked them like this Ar Cl S P Si Al Mg Na but then it tells me
1. 1 answer
2. asked by TYLER CHIRECE
3. 2,454 views
What is the relationship between delta T and molar mass of solute?The larger the value of delta T, the (larger,smaller) the
1. 2 answers
2. asked by G
3. 2,451 views
The correct sequence between genes and their phenotypic expression isa) RNA-DNA-protein-trait b) DNA-RNA-protein-trait c)
1. 1 answer
2. asked by Jill
3. 2,451 views
A thundercloud has an electric charge of 43.2 C near the top of the cloud and -38.7 C near the bottom of the cloud. The
1. 4 answers
2. asked by ELIZA
3. 2,412 views
While watching ocean waves at the dock of the bay, Otis notices that 9 waves pass beneath him in 28 seconds. He also notices
1. 1 answer
2. asked by Smithy
3. 2,407 views
The freezing point of a cyclohexane sample is 6.20*C. A soltuion is prepared by dissolving 0.4660g of an unknown solute in 36.0g
1. 1 answer
2. asked by K
3. 2,338 views
The boiling point of another member of this homologous series was found to be 309 K. What is the likely molecular formula for
1. 2 answers
2. asked by Alison
3. 2,334 views
Underline the complete subject with one line and circle the simple subject. Underline the complete predicate with two lines and
1. 5 answers
2. asked by Diane
3. 2,332 views
The reaction of CO(g) + NO(g) is second-order in NO2 and zero-order in CO at temperatures less than 500K.(a) Write the rate law
1. 2 answers
2. asked by Maria
3. 2,290 views
A 55-kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 44.7 degrees above
1. 1 answer
2. asked by Alan
3. 2,268 views
A football field, including the end zones, is 360 feet long and 160 feet wide. How many square yards of artificial grass would
1. 1 answer
2. asked by Anonymous
3. 2,099 views
The surface area of a particular cube is 600 square inches. When theedges of the cube are doubled in length, what is the volume
1. 3 answers
2. asked by ABC123DoReMi
3. 1,914 views
A British company is sending you measurements for a table to build in your factory. The table top must be 50 cm × 75 cm. Your
1. 2 answers
2. asked by tish
3. 1,698 views
Find dy/dx in terms of x and y if xlny+y^6= (9)lnx
1. 3 answers
2. asked by Catherine
3. 1,692 views
How many moles of chloroform, CHCl^3, are required to fill a 253-ml flask at 100.0 degrees Celsuis and 940 torr?
1. 2 answers
2. asked by Nick
3. 1,653 views
Explain why the addition method might be preferred over the substitution method for solving the system2x-3y=5 5x+2y=6
1. 2 answers
2. asked by Amy L
3. 1,635 views
If an elevator with mass of 4850kg is designed to have a maximum acceleration of .068g (g is gravity acceleration). What are the
1. 1 answer
2. asked by Mark
3. 1,600 views
A right square pyramid’s base has edges measuring 20 feet each. Ifthe pyramid’s height is 27 feet, what is its volume, in
1. 1 answer
2. asked by K
3. 1,586 views
If the solvent had been impure (that is, contaminated with soluble material); how woild this affect delta Tf (explain) and how
1. 2 answers
2. asked by G
3. 1,562 views
Both editors in chief asked for leave of absences at the same time.would the correct form be.... leaves?
1. 1 answer
2. asked by Sarah
3. 1,552 views
Assume you had used a well calibrated thermometer to measure the freezing point of a solvent, can you tell from the cooling
1. 1 answer
2. asked by G
3. 1,512 views
When you put water in a kitchen blender, it begins to travel in a 7-cm-radius circle at a speed of 1 m/s. How quickly is the
1. 1 answer
2. asked by olga
3. 1,508 views
How many atoms are contained in 8.8 g of CO2?
1. 2 answers
2. asked by jenny
3. 1,418 views
I am writing a paper on the novella Aura by Carlos Fuentes and so far I have a few paragraphs. I was just wondering if I were to
1. 3 answers
2. asked by Hannah
3. 1,411 views
A) If x^2+y^3−xy^2=5, find dy/dx in terms of x and y.dy/dx=________ B) Using your answer for dy/dx, fill in the following
1. 3 answers
2. asked by Catherine
3. 1,389 views
A plane flies horizontally at an altitude of 5 km and passes directly over a tracking telescope on the ground. When the angle of
1. 3 answers
2. asked by yolana
3. 1,382 views
Use Simpson's Rule and all the data in the following table to estimate the value of the integral .x -16 -15 -14 -13 -12 -11 -10
1. 2 answers
2. asked by aj
3. 1,381 views
A 1.1 kg block is held against a spring of force constant 2.0×10^4 N/m, compressing it a distance of 0.20 m.How fast is the
1. 1 answer
2. asked by Alan
3. 1,362 views
Does this question make sense:What is the author portraying in this chapter? or What are the emotions being portrayed in this
1. 3 answers
2. asked by Ann
3. 1,320 views
In what ways did the Conferences reflect Victorian social values and beliefs? In ur answer, consider the roles that women and
1. 6 answers
2. asked by Sara
3. 1,291 views
I am trying to cite the novella Aura for my works cited page.Fuentes, Carlos. Aura. Bilingual Edition, New York, 1965 Is this
1. 4 answers
2. asked by Hannah
3. 1,285 views
How do i plot a semi log graph for OD vs. time? The values for OD are under 1
1. 2 answers
2. asked by micro
3. 1,277 views
Find all the two digit prime numbers neither of whose digits are prime.Someone helped me yesterday but I do not understand.
1. 2 answers
2. asked by Diana
3. 1,271 views
1. It takes 190 kJ of work to accelerate a car from 21.0 m/s to 29.0 m/s. What is the car's mass?2. A 32-kg girl is bouncing on
1. 1 answer
2. asked by Leo
3. 1,250 views
A 5.4 kg block slides down an inclined planethat makes an angle of 38� with the horizontal. Starting from rest, the block slides
1. 0 answers
2. asked by Sara
3. 1,227 views
predict the product of the ff.reactions:C3H6 + HF C3H6 + H2O C3H6 + Cl2
1. 0 answers
2. asked by gel
3. 1,213 views
Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is
1. 1 answer
2. asked by olga
3. 1,180 views
what is the concentration in percent by volume of 25.0 mL of rubbing alcohol (C3H7OH) diluted to a volume of 200.0 mL with
1. 1 answer
2. asked by annonimous
3. 1,161 views
57. Sé poco de estos platos españoles en el menu. Voy a pedir _____.a. la especialidad de la casa b. el plato principal c. a
1. 1 answer
2. asked by mysterychicken
3. 1,150 views
Calculate the pH of a 25 mL sample of distilled water after the addition of 1 mL, 2 mL, 3 mL, 4 mL, and 5 mL of NaOH and HCL.
1. 1 answer
2. asked by Mariah
3. 1,147 views
49. Mi madre hace ____ con tortillas, carne de res, queso y tomates.a. el guacamole b. las quesadillas c. los tacos d. el flan
1. 1 answer
2. asked by mysterychicken
3. 1,130 views
My 1st grade son needs to write a paragraph but is having a very hard time grasping the concept. How can I help him with this?
1. 1 answer
2. asked by Jennifer
3. 1,124 views
Write a 150–200 word paragraph about the most helpful information you have learned from your other second-block course on how
1. 1 answer
2. asked by Shay
3. 1,120 views
Could you please check these sentences and tell me if they make sense.Write five sentences in which you address changes in your
1. 4 answers
2. asked by Debbie
3. 1,118 views
Can someone please help me?The brakes of a truck cause it to slow down by applying a retarding force of 2.60 103 N to the truck
1. 1 answer
2. asked by Phil
3. 1,114 views
If the diameter of a wheel is 10 inches. What is the radius and how would I find its circumference. Thanks I do understand that
1. 1 answer
2. asked by Americal
3. 1,112 views
If the BOD5 of a waste is 220 mg/L and the ultimate BOD is 320 mg/L, whatis the rate constant?
1. 1 answer
2. asked by Massiel
3. 1,098 views
Sheila wrote a division story. She asked how may equal groups 24 flowers could be put into. What information must she give about
1. 9 answers
2. asked by Amy
3. 1,088 views
consumer services then to be intangible.and goods tend to be tangible, use an example to explain how the lack of a physical good
1. 2 answers
2. asked by rose
3. 1,088 views
I'm stumped on this question.A teacher informs her history class that a test is very difficult, but the grades would be curved.
1. 1 answer
2. asked by Norilyn
3. 1,077 views
What is the electric potential at the center of the square shown in the figure below? Assume that q1 = 1 x 10-8 C, q2 = -2 x
1. 1 answer
2. asked by ikemaze
3. 1,069 views
what is the molarity of solution made from the equivalent of 125 g of sodium nitrate in 1.0 l of solution
1. 0 answers
2. asked by andrew b
3. 1,055 views
The four tires of an automobile are inflated to a gauge pressure of 1.84E+5 Pa. Each tire has an area of 0.0237 m2 in contact
1. 1 answer
2. asked by Megan
3. 1,050 views
2P(s) + 3Cl2(g) --> 4PCl3(l)What is the vapor pressure of PCl3 at 298K? Show Calculations.
1. 0 answers
2. asked by zfaz
3. 1,044 views
What is the difference/definitions of implicit and explicit theories? To be more specific, in social sciences, but I don't think
1. 1 answer
2. asked by Lela
3. 1,038 views
Why would you use weighing paper instead of filter paper for weighing the unknown sample?
1. 1 answer
2. asked by G
3. 1,038 views
In a long jump, an athlete leaves the ground with an initial angular momentum that tends to rotate his body forward, threatening
1. 1 answer
2. asked by jr
3. 1,036 views
Two questions that I'm unsure of are below:1). The variability of a statistic is described by: a) the spread of its sampling
1. 1 answer
2. asked by Anonymous
3. 1,025 views
Helen stands 66 m away from the base of the tree. If the line of sight makes an angle of 30 with the top of the tree with
1. 1 answer
2. asked by Valentine
3. 1,025 views
If my equation that I wrote does it matter how it is written. Does it matter if I write it'$200+$50h=c or c=$200+$50h or
1. 1 answer
2. asked by Sylvia
3. 1,021 views
if 50 g of HCL is dissolved in 100 g of water at 40 C, how much HCL must be added to the solution in order to saturate it?the
1. 1 answer
2. asked by Jazmin F.
3. 1,014 views
Cueca is a folk dance of Chile.(How do you pronounce "Cueca" in English?)
1. 0 answers
2. asked by rfvv
3. 1,003 views
for a set of three elements find the number of different subsets of 2 elements.use row 3 of pascals triangle
1. 1 answer
2. asked by jasmine
3. 999 views
7 is 175% of what number
1. 1 answer
2. asked by Rosa
3. 998 views
What OB/GYN subspecialties specializes in the use of a hysteroscopy?
1. 0 answers
2. asked by anne
3. 992 views
A bank account earns 10 percent interest compounded continously. What annual amount of money must parents deposit each year in
1. 3 answers
2. asked by aj
3. 989 views
I need assistance with this question please."The equation of the line for a graph of voltage (Ecell) versus log[Cu2+] was y=
1. 0 answers
2. asked by upthecreek
3. 987 views
find the nth derivative of 2/(x+1)
1. 2 answers
2. asked by amy
3. 976 views
How many grams of 2-propanol are expected from the complete reaction of 111 g of propene?
1. 0 answers
2. asked by Samantha
3. 973 views
A hot-air balloon is 180 ft above the ground when a motorcycle passes directly beneath it (travelling in a straight line on a
1. 1 answer
2. asked by Jake
3. 971 views
From a tree that is 15m tall, a fruit of mass 2kg falls to the ground. (a) find the initial GPE (b) find the speed at impact (c)
1. 0 answers
2. asked by Madi
3. 961 views
give that z = f(x,y). use partial derivatives to find δz/δx and δz/δy forxe^xz + z(xy+1)^3-sin x cos^2y=xy/z present your
1. 0 answers
2. asked by waklu
3. 956 views
the area of a regular hexagon is 35" squared. Find the length of a side.
1. 2 answers
2. asked by ryan
3. 954 views
Find the area of the region bounded by the graphs x=sqrt 2sin2y ; x=0
1. 1 answer
2. asked by sedat
3. 940 views
if a person's family grew wheat and corn and they needed cloth for a new shirt.what might have the family barted to get the
1. 1 answer
2. asked by alexander- very important!!!
3. 934 views
If a wave vibrates up and down once each second and travels a distance of 11 m each second, what is its frequency?
1. 2 answers
2. asked by Smithy
3. 933 views
What reagent converts sodiumethanoate to methane?
1. 0 answers
2. asked by Dan
3. 927 views
A developer buys a tract of land 0.5 mile long and 0.25 mile wide. Is this enough land to lay out a 75-acre golf course if there
1. 1 answer
2. asked by Anonymous
3. 926 views
Given: Triangle ABC ~ Triangle DEF, m<A = 50o, m<D = 2x + 5y, m<F = 5x + y, and m<B = 102 - x. What is the measurement of <F?
1. 1 answer
2. asked by mic
3. 921 views
When sodium forms an ion, will it form a cation or anion?
1. 0 answers
2. asked by Donnie
3. 919 views
The results of the 1912 election prove that Americans were ready for change and reform across the board. Each candidate offered
1. 3 answers
2. asked by David
3. 915 views
A 73.5 kg person sits on a 3.20 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.74 cm in
1. 2 answers
2. asked by Megan
3. 914 views
Calculate the pH of a solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mLof 0.10 M benzoic acid (Ka = 6.5
1. 1 answer
2. asked by haley
3. 913 views
11. A key technological development that began around 500 B.C.E. in sub-Saharan Africa was
1. 2 answers
2. asked by Anonymous
3. 903 views
Hello!When you are writing the unknown words f.e. on the board can you write the following or is something else correct (I am
1. 3 answers
2. asked by Mark
3. 896 views
Why did we have to use the same thermometer for finding, the freezing point of both, solvent and solution?If your thermometer
1. 1 answer
2. asked by G
3. 895 views
A raindrop (mass=1.00g) is travelling at a speed of 40m/s when it hits the surface of 100g of water contained in a drinking
1. 1 answer
2. asked by John
3. 894 views
34. EB = x + 3 and BD = 14. What is the value of x?(2 points)
1. 2 answers
2. asked by Jesicca
3. 873 views
What is a photon? Several selections may be correct.Has an energy of equal to hν. Is a unit of electromagnetic radiation. Is a
1. 1 answer
2. asked by Joel
3. 863 views
12(74y - (6+5Y - 8Z) = Please show work
1. 0 answers
2. asked by Todd
3. 862 views
a scooter goes from a velocity of 6.9 m/s to a velocity of 4.8 m/s in a time of 5.1 seconds. what is the acceleration of the
1. 0 answers
2. asked by nick
3. 862 views

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