Sunday

January 25, 2015

January 25, 2015

Total # Posts: 2,271

**chemistry2**

if 160g of Al reacts with O2 to produce 260g of Al2O3.calculate the theoretical yield and the percent yield 4Al+3O2 2Al2 O3
*May 5, 2010*

**Chemistry**

What is the pH of 50.0 M HF and 25.0mL of 1.0 M NaOH?
*May 4, 2010*

**PHYSICS**

A sample of monatomic gas (ã = 5/3) is expanded adiabatically from an initial temperature, volume, and pressure of 230. °C, 7.00 litres, and 7.00 kPa, respectively, to a final volume of 10.0 litres. (a) What is the final pressure of the gas? (answer 3.86 kPa) (b) ...
*May 2, 2010*

**math**

the statue of liberty is 150 feet tall, and stands on a 150 foot pedestal. How far from the base should you stand to have the statue subtend the largest possible angle at your camera lens, assuming the camera is held 5 feet off the ground and the ground is flat?
*May 2, 2010*

**8th grade**

what it he reason a spoon gets hot when put in a bowl of hot soup?
*April 30, 2010*

**Physics**

it didnt let me put the link to image.. A tube of radius 5 cm is connected to tube of radius 1 cm as shown above. Water is forced through the tube at a rate of 10 liters/min. The pressure in the 5 cm tube is 1×105 Pa. The density of water is 1000 kg/m3. Assume that the ...
*April 27, 2010*

**math**

mikes average on the first four exams in econ 1A is 88. what must he earn on the next exam to raise his overall average to 90
*April 27, 2010*

**Trigonometry**

1. Find the exact value of the following (Think identity) Cos(2 Arccos(5/13)) 2. Solve the following equation for 0° ≤ Θ < 360° Sec(Θ)= tan(Θ) + cos(Θ)
*April 26, 2010*

**algebra**

the area of the parallelogram is 96 square miles. Find its base and height. if the base is x+5 and the height is x-5
*April 23, 2010*

**IT**

Design a system which will take in the results for the five criterion levels of achievement for each phase of the design cycle: Investigate, Design, Plan, Create and evaluate. The system will then calculate the average and round up to the nearest decimal place. It will then ...
*April 21, 2010*

**english**

i think its a
*April 20, 2010*

**english**

n which one of the following sentences does the verb agree with the subject? A. The book that explains the plays is on the shelf. B. There is a million reasons why I shouldn’t go. C. Who is the people in the photograph? D. Here is the reasons we can’t start the car.
*April 20, 2010*

**Acoustics: Noise Vibration and Noise Control**

Hi there mate, sorry late reply. I havent really got any further. And my tutors dont really understand it. Have you?
*April 18, 2010*

**Acoustics: Noise Vibration and Noise Control**

Helicopter Noise Transmission It is planned to introduce a regular helicopter service from a helipad at ground level in a hospital premises. There will be four arrivals and four departures per day but never more than one arrival and one departure in any hour. There is a school...
*April 18, 2010*

**trig**

suppose that sin(x) + cos(x) = 4/3 a)square this result and find a value for sin(x)cos(x). b)using the result from a) find the exact value of sin^3(x)+cos^3(x). (Hint: Do you recall how to factor x^3 + y^3)
*April 14, 2010*

**chemistry**

In a certain chemical reaction 1.00 gram of product is produced in 15 minutes when the reaction is carried out at 20oC. Assuming that there is sufficient starting material available, how much product will be produced in the same length of time if the reaction is carried out in...
*April 12, 2010*

**chemistry**

In a certain chemical reaction 1.00 gram of product is produced in 15 minutes when the reaction is carried out at 20oC. Assuming that there is sufficient starting material available, how much product will be produced in the same length of time if the reaction is carried out in...
*April 12, 2010*

**Management of Information Sy**

Assignment: Hardware Replacement Project The IT department is implementing a new CRM solution to its corporate offices. The hardware currently in use is out of date and will not support the CRM application. The hardware must be replaced prior to deployment. • Resources: ...
*April 11, 2010*

**Physics Help Please!**

The change in temperature is 12 deg C if it rises from 15 to 27 degrees. 1. Find the mass of water from volume of water times its density. 2. Find the heat in Joule needed from Q=mct where m is mass of water, c is specific heat capacity and t is rise in temperature. Then the ...
*April 6, 2010*

**Physics**

Work done is force times distance moved. In 6 seconds, at 4m/s the box moves___m Force times distance = ______
*April 6, 2010*

**Chemisty**

Using slater's rules: S = 4.15 Zeff F^- = 4.85 Zeff Na^+ = 6.85 *these answers are in e^-(electrons)*
*April 5, 2010*

**Physics**

An ideal gas is squeezed slowly from state A (pressure-600 kPa, volume- 1 L) to B ( pressure-400kPa, volume- 0.5 L). What is the work done or received by the gas?
*March 27, 2010*

**Penn Foster Writing Assignment Writing Skills**

Could any one help me with this maybe email me and walk me through so steps!!
*March 24, 2010*

**Penn Foster Writing Assignment Writing Skills**

I have to do the same thing but im a little slow when it comes to writing so i have know idea what to do. Also i have know idea what have of this stuff is even though i took some test and still read it.
*March 24, 2010*

**math**

is the answer 12
*March 24, 2010*

**math**

A cyclist and a jogger start from a town at the same time and headed for a destination 24 mi away. The rate of the cyclist is twice the rate of the jogger. The cyclist arrives 3hrs ahead of the jogger. Whats the rate of the cyclist?
*March 24, 2010*

**college chem**

To solve this, you require the Henderson-Hasselbach equation: pH = pKa + log(conc.base/conc. acid) You have pH and pKa, so plug in the numbers, and solve for the ratio of Base/acid. With some algebra, you can then figure out the volume amounts of each species.
*March 23, 2010*

**5th grade**

how can 2and2 3thirds be equal to 16 sixths
*March 22, 2010*

**Accounting**

using the financial statements of landry's restaurant located in appendix a of the text fundamentals of financial accounting 1st ed by phillips libby and libby compute teh following ratios for 2002 and 2003 a. Return on Equity b. Inventory Turnover I cannot locate in ...
*March 20, 2010*

**Statistics**

Choose the right answers, and provide reasons and calculation To study the effect of change in price of a DVD ($) on the total profit (000, dollars), the analyst of an electronic firm randomly selected 13 retail sales stores. She used the data on total profit (y) and DVD price...
*March 17, 2010*

**Statistics**

Choose the right answer, and provide the reasons and calculations. A palmist claims that he can accurately predict the age at death (y) of an individual from the length (centimeters) of age line (x) on the right hand of the individual. A random sample of 20 dead individuals ...
*March 17, 2010*

**Statistics**

Choose the right answer, and provide the reasons and calculations. A palmist claims that he can accurately predict the age at death (y) of an individual from the length (centimeters) of age line (x) on the right hand of the individual. A random sample of 20 dead individuals ...
*March 17, 2010*

**Business Communications**

Which of the following sentences uses passive voice appropriately? A:"Your order was shipped yesterday and should arrive Friday." B:"The shipping clerk sent your order yesterday and it should arrive by Friday." C:"The decision was made after much ...
*March 16, 2010*

**Chemistry**

.445 L
*March 13, 2010*

**Math**

Use the fact that (125)^1/3 = 5 and the tangent line approximation to estimate (123)^1/3
*March 13, 2010*

**Accounting**

FIN 200 Checkpoint: break even analysis
*March 11, 2010*

**pre alg**

-8/75
*March 11, 2010*

**Math 98 pre algebra**

thank you
*March 11, 2010*

**Math 98 pre algebra**

14 and 2/3 times 2 and 2/11 divided by 3 and 3/8. i got =234 and 1/4 am I correct and if not what is the answer?
*March 11, 2010*

**math**

40 is what percent of 800
*March 9, 2010*

**math**

8.02-3.696
*March 9, 2010*

**Geometry**

cos x°=15/17 tan 76°=13/x
*March 9, 2010*

**Physics**

Two point charges, 5.0 µC and -2.0 µC, are placed 5.0 cm apart on the x axis, such that the -2.0 µC charge is at x = 0 and the 5.0 µC charge is at x = 5.0 cm. At what point(s) along the x axis is the electric field zero? I'm not exactly sure how i ...
*March 9, 2010*

**Math**

a circular track runs around a park. there is a sidewalk that connects two points on the track that runs through the center of the park. the sidewalk is 100 ft. long. How long is the track to the nearest half foot?
*March 8, 2010*

**Math**

I see it now,because a diagonal divides a parallelogram into two congruent triangles! Thank you!!
*March 5, 2010*

**Math**

So one side of the rhombus is equal to seven? I'm still confused as to how you got your answer...
*March 5, 2010*

**Math**

In rhombus DEFG, if m<DEF=60, and the shorter diagonal DF has a length of 7, find the length of the side of a rhombus.
*March 5, 2010*

**Geometry**

In rhombus PQSR, PQ=y+8 and QS = 4y-7. Find PQ. Also... In rectangle ABCD,AB=x+15, BC=x-8, and CD=2x+3. Find: 1)x. 2)AB 3)BC Thanks!
*March 5, 2010*

**chemistry**

When one pound of gasoline (made up of compounds of hydrogen and carbon) is burned in an automobile approximately 3 pounds of carbon dioxide, CO2, is given off. Carbon dioxide is one of the gases contributing to global warming. What information from this experiment helps ...
*March 3, 2010*

**Math**

5 didnt
*March 3, 2010*

**Chemistry**

Can someone explain hybrid structures and resonance structures.
*March 2, 2010*

**French**

I really do not know how to unscramble these two french olympic winter game words. They are: NDIIMOCORBQUENE and UPSOCEETRTI. Could you please help me?
*March 2, 2010*

**math **

in a balloon race,the sum of the distances covered by two of the balloons was 1,025 miles.if the distance covered by the first balloon was 50 miles more than 1/2 of that covered by the second balloon,how far did each travel?
*March 1, 2010*

**math**

at the town waterworks,2 large pumps and 4 smaller ones delivered 4,800 gallons of water a minute.each of the large pumps delivered 4 times as much water as each small pump.how many gallons per minute did each pump deliver?
*March 1, 2010*

**math**

a man paid $8.50 for a small pump and 8 feet of tubing.he paid 12 times as much for the pump as for each foot of tubing.how much did the pump cost? the tubing?
*March 1, 2010*

**Physics**

An electron moving to the right at 3.0% the speed of light enters a uniform electric field parallel to its direction of motion. If the electron is to be brought to rest in the space of 4.5 cm, determine the following. What direction is required for the electric field? What is ...
*March 1, 2010*

**5th grade science**

How might the history of the US be different if the first European settlements had occurred on the west coast instead of the east coast?
*February 25, 2010*

**Chemistry**

in this experiment you are you will begin by preparing a dilute soultion of sodium hydroxide by taking 50 ml of 3 M NaOh stock solution and diluting it with 250 ml of water. i found that and the answer was .5 but how do i do this b. calculate the number of moles and grams of ...
*February 23, 2010*

**Global History**

Thanks, Ms. Sue!
*February 23, 2010*

**Global History**

So, in this way, the British became imperialistic over Ireland? The British supressed Ireland's rebellions only to keep making the Irish export wheat and Barley?
*February 23, 2010*

**Global History**

How does the English government's attitude toward the Irish during the Irish famine in the late 1840's reflect the motivations for imperialism?
*February 23, 2010*

**chemistry**

I believe it comes out to CaSO4 x 2H20 20.9% 2:1 ratio I think haha
*February 19, 2010*

**Chemistry**

oh and thank you guys
*February 17, 2010*

**Chemistry**

nvm its -545. not quite sure why its exothermic
*February 17, 2010*

**Chemistry**

i get 545 but i'm not getting the right answer
*February 17, 2010*

**Chemistry**

btw, i meant to write 11.9C not 119. i work it like this: 200ml(1g/ml)(4.184J/C)(11.9C) then divide by (40.078g/mol/.732g) i get the wrong answer though
*February 17, 2010*

**Chemistry**

What is the molar heat of reaction? When 0.732 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 119C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay ...
*February 17, 2010*

**chemistry**

Looking up the specifications of an oil online, the spec sheet indicates that the specific gravity of this oil is .93. Does this mean that the oil weights .93 grams / 1 cubic centimeter of oil? Thanks
*February 16, 2010*

**11th grade**

Why is square root of x squared = absolute x? Is it because absolute x = -x and x?
*February 15, 2010*

**geography**

how come 10% of the land could be used to grow crops on ancient china
*February 11, 2010*

**Physics 2**

A cyllindrical copper cable carries a current of 1200 A. There is a potential difference of 1.6×10−2 V between two points on the cable that are 0.24 m apart. What is the radius of the cable?
*February 11, 2010*

**Physics 2**

The heating element of a clothes dryer has a resistance of 11 and is connnected to a 240-V electrical outlet. What is the current in the heating element? If the clothes dryer is run for 5 minutes, how much energy has been delivered to its heating element?
*February 11, 2010*

**Maths**

Width= 12cm because Length= 17cm 12+12+17+17= 58
*February 9, 2010*

**math**

suppose c is a subset of d and d is a subset of c. if n(c) = 5, find n (d).
*February 8, 2010*

**English 101**

Arriving at Lake Powell in a thunderstorms the campers found it safer to remain in their cars that setting up their tents.
*February 8, 2010*

**att DR BOB**

let me rephrase my question. A Mole of ethyl alcohol weights 46g.How many grams of ethyl alcohol are needed to produce 1 L of a 2 milimolar solution? I know the answer is 0.092g but I dont know how to derive it
*February 7, 2010*

**chemistry**

how many grams of ethyl alcohol are needed to produce 1 L of a 2 mM solution if 1 mole =46g of ethyl alcohol. how do you calculate?
*February 7, 2010*

**Calculus II**

How does one obtain cos2x = cos^2(x) - sin^2(x) by differentiating the identity sin2x = 2sinxcosx
*February 6, 2010*

**Computer Applications-87**

how is word used to create the componenet of a research paper
*February 5, 2010*

**Algebra**

3(a+2)=4a
*February 5, 2010*

**science**

what happens to the population of butterflies after a predator comes through? answer must include the words, gene and natural selection
*February 4, 2010*

**science**

what happens to butterflies after a predator come through include the word gene and natural selection
*February 4, 2010*

**math**

Suppose you have a friend named Ed. He and his four friends are having ice cream. There are only three flavors available at the ice cream store they are visiting: chocolate, vanilla, and strawberry. One of Ed’s friends, Stacey, eats chocolate exclusively. How many ...
*February 3, 2010*

**math**

what is the ratio of 1/2 to 1/4?
*February 3, 2010*

**math **

whats the ratio of 6 to 9?
*February 3, 2010*

**math**

the ratio of the consumption of gas to new york one year to that in chicago was 7/4.if 120 billion cubic feet wereconsumed in chicago,what was the consumption in new york?
*February 3, 2010*

**math**

the ratio of the consumption of gas to new york one year to that in chicago was 7 if 120 billion cubic feet were - 4 . consumed in chicago,what was the consumption in new york?
*February 3, 2010*

**MATH**

two boys weigh 120 pounds.what is the ratio of the weight of the first to that of the second?
*February 3, 2010*

**math**

find the ratio of 4 2 2 3 - x to - x of - ab 5 5 , 4 to 1 1 1 - ac of 2- to 7- of .7m to .8m, of 2 , 2 2, 2 2 2 ( x -y ) to (x-y) .
*February 3, 2010*

**math **

what is the ratio of 1 1 of 1 - to - - to 2 4?, 2 1 2 3 - - to- 3?,of 3 4?
*February 3, 2010*

**math **

what is the ratio of 1 1 of 1 - to - - to 2 4?, 2 1 2 3 - - to- 3?,of 3 4?
*February 3, 2010*

**math**

express it its lowest terms the ratio of 6 to 9:of 12x to 16y:of am to bm:of 20ab to 10bc: of m+n to 2 2 m -n.
*February 3, 2010*

**math**

a heavy freight train made a trip of 360 miles, running part of the distance at 54 miles an hour and the rest at 48 miles an hour.if the entire trip took 7 hours,find the distance traveled at each rate.
*February 3, 2010*

**Chemistry**

Idk my teacher gave me this question for homework and i had no idea how to do this. But this has to do with molarity and stoichiometrty if that helps
*February 2, 2010*

**Chemistry**

50 mL of 1M silver Nitrate is combined with 25 mL of 2 M potassium Chloride. What is the concentration of a resulting solution
*February 2, 2010*

**math**

They multiply by dividing
*February 2, 2010*

**ethics**

the difference between psychological and ethical egoism?
*January 31, 2010*

**math**

a group of friends shared the expenses of an automobile trip,which cost $40.if there had been 3 more people in the group.each would have $3 less.how many people were there in the group and how much did each pay?
*January 28, 2010*

**economics**

are there hidden environmental and social costs
*January 26, 2010*

**math**

find the worlds production of nickel in a year when russia and new caledonia together produced 1/3 of it,canada 1/6 of it,and australia 1/9 of it, and the rest of the world 420,000 tons
*January 24, 2010*

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