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2011
April

Questions Asked on April 28, 2011

How much energy is required to decompose 765 g of PCl3, according to the reaction below? The molar mass of PCl3 is 137.32 g/mol
1. 2 answers
2. asked by yr
3. 5,638 views
Consider the following reactions and their equilibrium constants.(NO(g) + 0.5Br2(g) <===> NOBr(g) Kp = 5.3 2NO(g) <===> N2(g) +
1. 5 answers
2. asked by jon
3. 5,322 views
Identify the acid/conjugate base and base/conjugate acid pairs for the following reactionsH2CO3(aq) + H2O(l) <===> H3O+(aq) +
1. 1 answer
2. asked by jake
3. 5,061 views
calculate the volume(ml) of a 0.215M KOH solution that will completely neutralize each of the following?a) 2.50ml of a 0.825M
1. 2 answers
2. asked by Connie
3. 4,736 views
Im having trouble getting the correct answer to this question. Could someone help out.Monthly sales of a particular personal
1. 1 answer
2. asked by Anonymous
3. 4,132 views
The generator at a power plant produces AC at 24,000 V. A transformer steps this up to 345,000 V for transmission over power
1. 2 answers
2. asked by Mateo
3. 3,780 views
For which value of k does the matrix8 k -9 -3 have one real engenvalue of multiplicity 2? Explain.
1. 2 answers
2. asked by Anonymous
3. 3,623 views
At a certain temperature, the reactionCO(g) + 2H2(g) <===> CH3OH(g) has Kc = 0.500. If a reaction mixture at equilibrium
1. 3 answers
2. asked by chris
3. 3,400 views
what is the molarity of a solution containing 23g of NaCl in 500 mL of solution? (the molecular mass of NaCl is 58.44.)
1. 2 answers
2. asked by lilly
3. 3,021 views
what is the surface area of a rectangular prism with the width 4cm lenth 5cm height of 3cm
1. 1 answer
2. asked by dianalish`
3. 3,007 views
Bob and Latoya both drove to a baseball game at a college stadium. Bob lives 70 miles from the stadium and latoya lives 60 miles
1. 5 answers
2. asked by Beth
3. 2,919 views
When a yellow light shines on a photosensitive metal, photoelectrons are emitted. As the intensity of the light is decreased,
1. 1 answer
2. asked by ashley --
3. 2,909 views
H2 + F2--> 2HF deltaH = 518.0 kJH2 ----> 2H deltaH = 436.8 kJ F2 ---> 2F deltaH = 158.2 kJ (a) calculate Delta H for H + > HF
1. 3 answers
2. asked by jessica
3. 2,541 views
Although water and ammonia differ in molar mass by only one unit, the boiling point of water is over 100 degrees C higher than
1. 2 answers
2. asked by Joe Schmo
3. 2,240 views
The physics of electric potential energy at one corner of a triangle.Two charges, q1 = +5.0 ìC and q2 = -2.0 ìC are 0.50 m
1. 1 answer
2. asked by aly
3. 2,133 views
The soup in a bowl is too hot to eat. Although there are no ice cubes in the freezer, there are several stainless steel spoons
1. 3 answers
2. asked by Anon
3. 2,116 views
A 37 ohm lamp and a 59 ohm lamp are connected in series and placed across a potential of 43 V.What is the equivalent resistance
1. 3 answers
2. asked by Leslie
3. 2,112 views
Meteorites from Mars Several meteorites found in Antarctica are believed to have come from Mars, including the famous ALH84001
1. 1 answer
2. asked by Randy
3. 2,005 views
(AAAAA)The standard reduction potentials of lithium metal and chlorine gas are as follows: (for Li, reduction potential is
1. 1 answer
2. asked by lili
3. 1,834 views
in the chemical equation :2C2H6+7O2->4CO2+6H2O, hOW many moles of c2h6 will you need to form 2.34 mol of co2? How many moles of
1. 1 answer
2. asked by kelly
3. 1,800 views
Find the minimum kinetic energy needed for a 3.7×104-kg rocket to escape the Moon.
1. 1 answer
2. asked by Randy
3. 1,779 views
Strontium-85, used for bone scans, has a half-life of 64 {\rm d}.How long will it take for the radiation level of strontium-85
1. 1 answer
2. asked by Help!!
3. 1,773 views
The physics of moving a small charge through a potential difference.How much work is needed to move a -8.0 ìC charge from
1. 2 answers
2. asked by aly
3. 1,752 views
The physics of an electron falling through a potential difference.How much kinetic energy will an electron gain (joules) if it
1. 2 answers
2. asked by aly
3. 1,727 views
The wavelength of an electromagnetic wave is measured to be 600 m. What is the frequency of the wave?
1. 1 answer
2. asked by Mateo
3. 1,708 views
find the greatest common factor and simplify your answer. 4v to the 7th power y to the 9th power and 16v to the 6th power x to
1. 1 answer
2. asked by kim
3. 1,686 views
Use the standard reaction enthalpies given below to determine Î”H°rxn for the following reaction:P4(g) + 10 Cl2(g) â†’
1. 1 answer
2. asked by yr
3. 1,661 views
Use the Î”H°f information provided to calculate Î”H°rxn for the following:Î”H°f (kJ/mol) SO2Cl2 (g) + 2 H2O(l)
1. 2 answers
2. asked by yr
3. 1,659 views
The physics of an electron moving from one plate to another.An electron acquires 4.2 x 10-16 J of kinetic energy when it is
1. 0 answers
2. asked by aly
3. 1,596 views
What's a good thesis statement for the book hunger games ?
1. 3 answers
2. asked by Kay
3. 1,572 views
A disk with a rotational inertia of 7 kgm^2 rotates like a merry-go-round while undergoing a torque given by (5+2t)Nm. At time
1. 2 answers
2. asked by Zack
3. 1,531 views
draw the structural formula for 1,3,5-trichlorocyclohexane
1. 2 answers
2. asked by Star
3. 1,512 views
Estimate to the nearest integer.Square root of -55
1. 2 answers
2. asked by Dylan
3. 1,500 views
The Crucible by Arther Miller1-Which of the following significant events occurs after the play begins? a. A group of girls
1. 3 answers
2. asked by Anonymous
3. 1,500 views
how many feet from the base of a house must a 39-foot ladder be placed so that the top of the ladder will reach a point on the
1. 1 answer
2. asked by Anonymous
3. 1,498 views
The normal boiling point of benzene is 80 degree C and its heat of vaporizations is 30.8 kj/mol. What is its boiling point at
1. 4 answers
2. asked by Tyler
3. 1,478 views
The physics of electric field between two charges.What is the magnitude and direction of the electric field at a point midway
1. 1 answer
2. asked by aly
3. 1,441 views
Linking and action verbs. I have 3 sentences not sure what the verb or linking verb is in them.1. I am happy for my brother. 2.
1. 9 answers
2. asked by Kam
3. 1,412 views
faizel wants to travel from his house to the hardware store that is six blocks east and five blocks south of his home. If he
1. 2 answers
2. asked by Jay
3. 1,409 views
A student mixed 75.0 mL of water containing 0.75 mol HCI at 25* C with 75.0 mL of water containing 0.75 mol of NaOH at 25*C in a
1. 1 answer
2. asked by Tarra
3. 1,402 views
If Nefertiti could pronounce her name in six tenths of a second. At that rate, how many times could she pronounce her name in 15
1. 2 answers
2. asked by Emily's mom
3. 1,392 views
A pound of body fat stores an amount of chemical energy equivalent to 3500 Cal. When sleeping, the average adult burns or
1. 1 answer
2. asked by gabby
3. 1,382 views
How many liters of air (78 percent N2, 22 percent O2 by volume) at 20 degrees Celsius and 1.00 atm are needed for the complete
1. 4 answers
2. asked by Star
3. 1,363 views
A buffer that consists of a mixture of NaH2PO4 and K2HPO4 has a pH of 6.73. The (HPO4)/(H2PO4) ratio in this buffer is what? If
1. 1 answer
2. asked by Anonymous
3. 1,357 views
The recommended dosage of iodine-131 is 4.20 \mu{\rm Ci/kg} of body weight. How many microcuries of iodine-131 are needed for a
1. 3 answers
2. asked by Help!!
3. 1,348 views
0.5 L of a 0.30 M HCl solution is titrated with a solution of 0.6 M KOH.a)What is the pH before addition of KOH? b)What is the
1. 5 answers
2. asked by Joe
3. 1,323 views
explain mathematical expression for each phrases like 3 less than a number x
1. 2 answers
2. asked by mirna
3. 1,316 views
You are driving a car down a straight road at a constant 48 miles per hour.Consider the following forces: I) air drag pushing
1. 2 answers
2. asked by Diana
3. 1,314 views
Formic acid (HCHO2) is a component of bee stings. It is a weak acid and dissociates according to theequilibrium shown below:
1. 2 answers
2. asked by carlo
3. 1,308 views
A stationary 3.0-m board of mass 6.0 kg is hinged at one end. A force is applied vertically at the other end, and the board
1. 1 answer
2. asked by Kayla
3. 1,292 views
A coil of wire rotating in a magnetic field induces a coltage E=20sin((PIa/4) - (PI/2)). Use an identity to express this in
1. 4 answers
2. asked by Blake
3. 1,272 views
What effects or potential effects do technologically based communication modalitiesâ€”between patients and health care
1. 0 answers
2. asked by rona
3. 1,271 views
a sample of limestone and other solid materials is heated and the limestone decomposes to give calcium oxide and carbon dioxide:
1. 2 answers
2. asked by Ben
3. 1,245 views
1) What do you think Canadians can learn from other cultures about the treatment of illnesses?2) Define good health, illness,
1. 1 answer
2. asked by Alex L.
3. 1,235 views
Trying to figure out how to draw the structure 2-bromo-4-phenylpentaneI thought it was a five carbon strong with the ring on the
1. 2 answers
2. asked by Star
3. 1,222 views
The doubling time of a type of bacteria is 35 minutes. If every bacterium reproduces, then after 35 minutes a population of 64
1. 2 answers
2. asked by keke
3. 1,177 views
A dragster maintains a speedometer readingof 100 km/h and passes through a curve with a constant radius. Which statement is
1. 1 answer
2. asked by Leslie
3. 1,166 views
use reimann sums and a limit to compute the exact area under the curve of y=2x^2+1 on the interval[1,3]... i am having trouble
1. 1 answer
2. asked by amy
3. 1,163 views
how do i express each ratio as a fraction in simplest form?
1. 2 answers
2. asked by janie
3. 1,161 views
A spaceship of mass m is located between two planets of masses M1 and M2; the distance between the two planets is L. Assume that
1. 3 answers
2. asked by Fernando
3. 1,154 views
in right triangle PQR,Q=90DEGREE,PQ=4 AND PR=7 WHAT IS ANGLE R TO THE NEARST TENTH OF A DEGREE
1. 1 answer
2. asked by mathew
3. 1,150 views
Braking distance The braking distance y in feetthat it takes for a car to stop on wet ,level pavement can be estimated by y =
1. 2 answers
2. asked by Shin
3. 1,148 views
Which word has a vowel in it's second syllable?A. away B. Handle C. Cancel
1. 1 answer
2. asked by Hailey
3. 1,134 views
consider a 6x12 fra where the underlying six-month period is 183 days and the notional is $100. The fra fixed rate is 5%. At
1. 1 answer
2. asked by Nick
3. 1,112 views
Which of the following is true for the transition of electrons from a higher energy to a lower energy state?Choose one answer.
1. 4 answers
2. asked by ashley --
3. 1,111 views
a 0.5 m^2 solar collector radiation from the sun and focuses it on 250g of water that is inially at 23 degrees . the average
1. 4 answers
2. asked by H.T
3. 1,100 views
Errors in the use of punctuation marks - Semicolons and ColonsAnswer Daniel Boone was born in Pennsylvania; his parents were
1. 1 answer
2. asked by Kimberly
3. 1,062 views
If you had a more accurate ruler with divisions of 1mm (a standard ruler you would find) what would the absolute error be? (In
1. 1 answer
2. asked by H.T
3. 1,060 views
would i say: this would greatly contribute to successful customer advices on footwear.or this would greatly contribute to
1. 4 answers
2. asked by Viola
3. 1,040 views
Volcanoes emit much hydrogen sulfide gas, H2S, which reacts with the oxygen in the air to form water and sulfur dioxide, SO2.
1. 1 answer
2. asked by Anonymous
3. 1,018 views
se the information provided to determine Î”H°rxn for the following reaction:Î”H°f (kJ/mol) 3 Fe2O3(s) + CO(g) â†’ 2
1. 1 answer
2. asked by yr
3. 1,013 views
Need a formula for this math problem. Help!?Relinda owns a tea shop and is creating a new mix of tea for her customers. She is
1. 3 answers
2. asked by Nicki
3. 1,004 views
someebodyyyyyyyyyyyyyyy help stuck in pre algebra hw!!!!!!!!!!!!!!!!
1. 1 answer
2. asked by Anonymous
3. 987 views
The active element of a certain laser is made of a glass rod 30cm long and 1.5cm in diameter. The average coefficient of linear
1. 1 answer
2. asked by UnKnown
3. 974 views
90,40,15. What is the next number in the pattern and what is the rule for the pattern
1. 1 answer
2. asked by theresa
3. 973 views
Simplify 1 over 2 of 1 over 4 devide 1 over 3 all over 1 over 6 minus 3 over 4 plus 1 over 2
1. 5 answers
2. asked by Simplification
3. 955 views
Which of the following confirms the wave nature of particles?a. Photoelectric effect b. Rutherford's alpha scattering experiment
1. 1 answer
2. asked by ashley --
3. 930 views
The physics of the DNA molecule.The two strands of the DNA molecule are held together by electrostatic forces. There are four
1. 0 answers
2. asked by aly
3. 925 views
Read the summary paragraph on the bottom of p. 37. Identify the author’s goal in writing the paragraph. How effectively do you
1. 2 answers
2. asked by jenny
3. 923 views
The process that uses electricity to decompose chemical compounds/prepare new chemical compounds
1. 0 answers
2. asked by Anonymous
3. 898 views
A dragster maintains a speedometer readingof 100 km/h and passes through a curve with a constant radius. Consider the following
1. 3 answers
2. asked by Leslie
3. 893 views
if you have 2 mol of glucose in 4L of solution, what is the molarity of the solution?
1. 1 answer
2. asked by lilly
3. 867 views
I need to create a flowchart/psuedocode for a dice game that give you 2 rolls with 5 dice, 3 rolls per game. the computer will
1. 0 answers
2. asked by Jenna
3. 857 views
Why is the apothem of an equilateral triangle one third its height?
1. 1 answer
2. asked by Liana
3. 856 views
Review the cities located within the following longitude and latitude coordinates: 70-80 West Longitude and 30-40 North
1. 6 answers
2. asked by surfsupmel
3. 850 views
(-13,-15) and (-6,-18)Find the slope, if it exists, of the line containing the pair of points
1. 2 answers
2. asked by MATH
3. 846 views
There is a net passage of 4.5 1018 electrons by a point in a wire conductor in 0.26 s. What is the current in the wire?
1. 1 answer
2. asked by Eric
3. 832 views
The business plan should include the concepts and ideas covered during the past several weeks. The following points need to be
1. 0 answers
2. asked by d
3. 820 views
Errors in the use of punctuation marks - Use of Quotation Marks and Terminal PunctuationAnswer Several universities in the city
1. 1 answer
2. asked by Kimberly
3. 820 views
The normal concentration of sodium chloride in blood is 0.9% (w/v). Therefore, assuming FW for Nacl of 58.4 g/mole, an isotonic
1. 1 answer
2. asked by Lady L
3. 813 views
Briefly describe the works of art and the artists to discuss, Where is/are the works located? What time period is the art from?
1. 1 answer
2. asked by Carolyn
3. 801 views
if you had 14 moles of octane how many moles of carbon dioxide would you get?
1. 2 answers
2. asked by sylvia
3. 798 views
I have a question on my previous post.Why do you say "in the morning I usually have a shower/On the following morning/night I
1. 1 answer
2. asked by Henry1
3. 798 views
Initially, there are 33 moles of A and 0 moles of B. How many moles of A and B will be present after the system reaches
1. 4 answers
2. asked by Adam
3. 796 views
Let f be the function given by f(x)=3sqrt(x-2).A) On the axes provided sketch graph of f and shade the region R enclosed by the
1. 0 answers
2. asked by Michael
3. 792 views
The lateral area of a prism is 144cm^2 (lateral area is surface area without the bases). If the height is double the width, and
1. 1 answer
2. asked by Anonymous
3. 789 views
I don't understand how you get the answer. I really don't understand any of this, how do I set it up with the numbers? once i
1. 2 answers
2. asked by Ben
3. 779 views
How many Kilograms of water must be added to 5.0 grams of oxalic acid (H2C2O4) to prepare a 0.40 Molality?
1. 4 answers
2. asked by Laura
3. 767 views
100 grams of glucose is mixed with 500 grams of water. 10 grams of yeast is then added to the mixture. If the reaction goes to
1. 1 answer
2. asked by William
3. 765 views
4v to the 7th power y to the 9th power and 16v to the 6th power x to the 8th power y to the 5th power
1. 0 answers
2. asked by kim
3. 756 views

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