Friday

October 24, 2014

October 24, 2014

Number of results: 28,422

**chemistry(check my work)**

Calculate the value of the equilibrium constant (Kp) for the reaction displayed if the following equilibrium pressure data were measured at 25.00 °C: P(H2(g)) = 0.2282 atm, P(I2(g)) = 0.1646 atm, P(HI(g)) = 5.462 atm. H2(g)+I2(g) = 2HI(g) is it like this, (5.462)^2/(0.2282x0....
*April 4, 2010 by bme1*

**chemistry**

The gaseous product of a reaction is collected in a 30.0 L container at 37 degrees C. The pressure in the container is 2.5 atm and the gas has a mass of 85.0 grams. What is the molar mass of this gas? I know the correct answer is 28.8 g/mol but I need to know how to get the ...
*February 7, 2013 by Kat*

**science**

kevin has a piece of aluminum which has a density of 2.7gms/cm3 and a mass of 63 grams what is the volume of the piece of aluminum
*September 17, 2007 by ricky*

**Algebra 1**

A cylinder has a radius of 5 in. If the volme of the cylinder is 250p in.3, what is the height of the cylinder? [Hint: The volume of a cylinder is given by V = pr2h.]
*September 18, 2007 by help me please(c.c)*

**Algebra 1**

A cylinder has a radius of 5 in. If the volme of the cylinder is 250p in.3, what is the height of the cylinder? [Hint: The volume of a cylinder is given by V = pr2h.]
*September 18, 2007 by Brenna*

**chemistry**

Calculate the volume of a 9.00 M HNO3 stock solution that must be used to prepare 450 mL 0f a 1.80 M HNO3 solution.
*May 7, 2008 by katie*

**math**

Height: The volume of a cone is 100 in^3. Find a function that models the height h of the cone in terms of its radius r.
*October 9, 2009 by David*

**Math**

Height: The volume of a cone is 100 in³. Find a function that models the height h of the cone in terms of its radius r.
*October 9, 2009 by David*

**chemistry**

a gas has a volume of 1.75 L at -23 degrees C and 150.kPa What temp would the gas occupy 1.30 L at 210.kPa?
*May 18, 2010 by Anonymous*

**Chemistry**

A volume of 25.0 ml of 0.100 M CH3C02H is titrated with 0.100 M NaOH. What is pH after the addition of 12.5 ml of NaOH? (Ka for CH3CO2H = 1.8x10-5)
*October 18, 2010 by Helen*

**chemistry**

To what final volume should you dilute 50.5ml of a 4.75 M KI solution so that 27.5ml of the diluted solution contains 3.10g of KI
*October 24, 2010 by help*

**Chemistry...Help!!**

To what volume should you dilute 131 mL of an 8.20 M CuCl2 solution so that 49.0 mL of the diluted solution contains 4.53g CuCl2 ?
*December 7, 2010 by Lisa, Help needed!*

**chemistry**

what volume of 0.250 M calcium chloride needs to be added to sodium phosphate to produce 35.0 g of calcium phosphate ?
*December 15, 2010 by jenna*

**Chemistry**

a gas has a volume of 1.75 L at -23 degrees Celsius and 150 kPa at what temperature will the gas occupy 1.30 L at 210 kPa
*January 20, 2011 by Samantha*

**Chemistry**

What is the volume of Tin(Sn)? Mass of sample = 2.588g Initial vol. of water = 31 m/L Final vol. of water = 32 m/L
*February 10, 2011 by Sierra*

**Chemistry**

You are given 73 mL of CO2 at 0.69 atm. What volume (in mL) would the CO2 occupy at 0.67 atm if the temperature is maintained at a constant 25 °C.
*July 30, 2011 by Kyle*

**College Chemistry**

What is the pH when 10 mL of 1 M acetic acid is added to pure water so that the final volume is 100 mL? The Ka for acetic acid is 1.74 x 10^(-5)
*September 23, 2011 by Jamal*

**chem**

What volume of a 8.50M Na2CO3 solution would be required to prepare 220.00mL of a 8.20%w/v Na2CO3 solution?
*November 29, 2011 by darren*

**math**

the package space on a truck is 5 meters long, 3 eters wide, and 2 meters tall. what is the volume of the space
*March 8, 2012 by Jhronne*

**chemistry**

A solution of NaOH with pH 13.68 requires 35.00 mL of 0.128 M HClO_4_ to reach the equivalence point. What is the volume of the NaOH solution?
*March 8, 2012 by Savannah*

**Chemistry**

What volume will be required to contain a mixture of 0.547 mol of N2 and 0.547 mol of O2 at 1.11 atm and 22.1 degrees celsius?
*March 20, 2012 by Harry*

**chemistry**

A substance placed in a container has a fixed volume and takes up the shape of the container. In which state does this substance exist?
*June 13, 2012 by julie*

**Math**

the cube has a volume of 8.If point x,the midpoint of AV is joined to point y, the midpoint of edge CD what is the length of the shortest distance from x to y?
*August 8, 2012 by Grace*

**Chemistry**

what volume, in L, of a 10.0M HCL solution is needed to make 2.00L of 2.00m HCL solution by dilution with water. Thank you
*September 1, 2012 by kate- Please help*

**Chemistry**

A lead atom has a mass of 3.4x10^-9g. How many lead atoms are in a cube of lead that has a volume of 2.00cm^3 if the density of lead is 11.3g/cm^3?
*September 7, 2012 by Hope*

**chemisty**

What volume of 0.250 M calcium chloride needs to be added to sodium phosphate to produce 35.0g of calcium phosphate?
*November 29, 2012 by kenny*

**Physics**

What is the net vertical force on this balloon if it is let go? The mass of the rubber in the balloon is 1.50g. Ignore the volume of rubber.
*December 12, 2012 by Anonymous*

**Chemistry105**

A 10.00 mL volume of sulfuric acid required 23.65 mL of NaOH solution for complete neutralization. What is the molarity of the acid solution?
*December 18, 2012 by Mira*

**math**

if a fish tank shaped like a rectangular prism that is 20cm by 20cm by 16cm. what is the volume of the tank
*January 9, 2013 by shemeika*

**Chemistry**

What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 4.40 L of an NaOH solution with a pH of 10.5?
*March 17, 2013 by Emma*

**chemistry (charles law)**

A 4.0L sample of methane gas is collected at 30.0 celcius .predict the volume of the sample at 0 celcius.
*April 28, 2013 by ty*

**Chemistry**

What volume of a liquid having a density of 4.55 g/cm3 is needed to supply 10.47 grams of that liquid? Answer in cm3.
*October 12, 2013 by Andy*

**chemistry**

Calculate the volume of solution needed to obtain 0.320 mol of KCl from a solution with a concentration of 0.64 mol dm-3
*April 10, 2014 by John*

**Chemistry**

A tank contains helium for filling balloons. It holds 6.75 L of Ne at 24.8 atm and 27.5 °C. What would be the volume of this helium at 2.13 atm and 10.6 °C?
*May 6, 2014 by Aleena *

**Chemistry**

The concentration of glucose in blood is 5.67%m/v. How many grams of glucose would be found in an adult male with a blood volume of 5.2L?
*July 13, 2014 by Diana*

**Math**

In a bathroom, 5cm of rain falls from a shower. The volume of water that falls on 1.5 hectares of floor of bathroom t
*August 30, 2014 by Noor*

*****CHEM QUESTIONS*****

1. will molten sodium chloride (NaCl) cunduct electric current? Why? 2. Why does adding detergent to water make it spread out into thin sheets. (Use a name and explanation) 3. Define capillary action 4. Which has a greater vapor pressure: CCl4 (carbon tetrachloride)or CH30H (...
*March 8, 2009 by BRITTANY!*

**LAng Arts**

Here is a proposal that is sure to anger some people: Everyone— yes, everyone—should have a pet. I think we should require that everyone get a pet or else present a convincing reason why they can’t have one. There are almost too many arguments in favor of companion animals to ...
*April 10, 2013 by Anonymous*

**Physics**

A tennis ball is struck such that it leaves the racket horizontally with a speed of 53 m/s. The ball clears the net and hits the ground a horizontal distance 29 m from where it was hit. How long was the ball in the air and how high was the ball above the ground when it is hit?
*May 1, 2008 by Angelina*

**Physics**

Im talking about the friction between a golf club and the air as the golf club is swinging towards the ball. how does the mass of the club, the velocity of the swing and the acceleration affect the friction acting on the club and how much will it slow down?
*April 26, 2009 by Lena*

**physics**

You drop a ball from a height of 2.8 m, and it bounces back to a height of 1.0 m. (Ignore air resistance.) (a) What fraction of its initial energy is lost during the bounce? b) What is the ball's speed just as it leaves the ground after the bounce? (c) Where did the energy go?
*October 12, 2009 by mike*

**physics**

Harry accidentally falls out of a helicopter that is traveling at 80 m/s. He plunges into a swimming pool 4 seconds later. Assuming no air resistance, what was the horizontal distance between Harry and the swimming pool when he fell from the helicopter?
*September 29, 2011 by Abby*

**Physics**

Problem 17.6 A helium-neon laser beam has a wavelength in air of 633nm . It takes 1.48 ns for the light to travel through 31.0 cm of an unknown liquid. Part A - What is the wavelength of the laser beam in the liquid? Express your answer with the appropriate units.
*October 26, 2011 by Paige*

**Physics**

Problem 17.6 A helium-neon laser beam has a wavelength in air of 633nm . It takes 1.48 ns for the light to travel through 31.0 cm of an unknown liquid. Part A - What is the wavelength of the laser beam in the liquid? Express your answer with the appropriate units.
*October 26, 2011 by Paige*

**physics**

In a car crash, a 44 kilogram passenger moving at 15 meters per second is brought to rest by an air bag during a 0.10 second time interval. What is the magnitude of the average force exerted on the passenger during this time?
*November 7, 2011 by Nashaly*

**Math**

A diver is working 10 feet below the surface of the water. The gap between the water and the deck of his support barge is 1/8 of the total length of the air hose and 2/3 of the total length remains on the reel. What is is maximum working depth?
*September 13, 2012 by Adam*

**physics**

A 0.73 kg ball is thrown straight up with an initial velocity of 2.50 m/s. Taking the potential energy of gravity to be zero at the height from which the ball is thrown, determine its gravitational potential energy at the balls highest point. Ignore air resistance.
*October 5, 2012 by nate*

**PHYSICS**

You drop a ball from a height of 2.8 m, and it bounces back to a height of 1.4 m. (Ignore air resistance.) (a) What fraction of its initial energy is lost during the bounce? (b) What is the ball's speed just as it leaves the ground after the bounce? m/s (c) Where did the ...
*February 10, 2013 by ryan*

**physics**

A airplane is approaching you at a speed of 360km/h. If you measure the pitch of its approaching engines to be 512 Hz, what must be the actual frequency of the sound of the engines? The speed of sound in air is 345m/s answer is 364Hz please explain steps?
*July 17, 2013 by justin*

**Physics**

A juggler throws a ball straight up into the air and it takes 2.80 seconds to reach its peak. How many seconds will it take after that to fall back into his hand? Assume he throws and catches the ball at the same height.
*October 21, 2013 by Jacob*

** physics**

A projectile with mass of 139 kg is launched straight up from the Earth's surface with an initial speed vi. What magnitude of vi enables the projectile to just reach a maximum height of 5.8RE, measured from the center of the Earth? Ignore air friction as the projectile goes ...
*February 28, 2011 by Ugandanmafia*

**Math**

A plane can fly 140 mph in calm air. Flying with the wind, the plane can fly 700 mi in the same amount of time it takes to fly 420 mi against the wind. Whats the rate of the wind?
*March 24, 2010 by Meghan*

**AP PHYSICS**

the height of the upper falls at Yellowstone falls is 33.2m. when the water reaches the botton of the falls, its speed is 25.8 m/s. neglecting air resistance, what is the speed of the water at the to of te falls.
*November 15, 2010 by paul*

**Physics - Fluids**

A cylindrical diving bell 3.0 m in diameter and 4 m tall with an open top of 25 degrees celsius, and the air temp 220 down is 5 degrees celsius. The density of seawater is 1025 kg/m^3. How high does the sea water rise in the bell when the bell is submerged?
*December 17, 2008 by Peter*

**physics**

4.80-kg watermelon is dropped (zero initial speed) from the roof of a 25.0-m-tall building. a) Calculate the work done by gravity on the watermelon during its displacement from the roof to the ground. b) What is the kinetic energy of the watermelon just before it strikes the ...
*February 21, 2010 by anton*

**physics**

a golf ball with an initial angle of 38 degrees lands exactly 240 m down the range on a level course. neglecting air friction, what initial speed would achieve this result? using that initial speed, what is the maximum height reached by the ball?
*November 17, 2010 by Anonymous*

**physics**

a ball mass 800g is dropped from height of 5m and rebounds to a hight of 3.8m the air resistance is negligible. calculate a. the kinetic energy of the ball just before impact b. the initial rebound speed of the ball c. the energy transferred to the ground during impact
*December 13, 2010 by lewis*

**Physics**

A seed shoots out from the pod with the speed of 2.4 m/s but with a direction of motion 30° below the horizontal. The seed pod is initially 1.2 m above the ground. (a) How long does it take for the seed to land? (Neglect air resistance.) (b) What horizontal distance does it ...
*October 14, 2011 by Kaylah*

**Calculus**

A pomegranate is thrown from ground level straight up into the air at time t=0 with velocity 128 feet per second. Its height in feet at t seconds is f(t)=16t^2+128t. Find the time its hits the ground and the time it reaches its highest point.
*January 30, 2012 by Anonymous*

**Physics **

Isaac pushes rock, of a mass of 20kg, if from a cliff and it falls into the lake below. The cliff was 3m above the water. (Assume no air resistance) a. How much time did it take the rock to hit the water? b. What was its velocity when it was half of the distance to the water?
*February 20, 2012 by Hayli*

**physics please help!**

A bat moving at 6.5 m/s is chasing a ﬂying insect. The bat emits a 37 kHz chirp and receives back an echo at 37.65 kHz. At what speed is the bat gaining on its prey? Take the speed of sound in air to be 336 m/s. Answer in units of m/s
*December 8, 2012 by maura *

**Physics**

A ball of mass 0.3 kg, initially at rest, is projected from ground level toward a wall that is 27.0 m away. The ball's velocity the moment it is projected is 75.0 m/s at 60° relative to the horizontal, and the wall is 11.0 m high. During its flight, the ball impacts nothing ...
*March 7, 2013 by Jalen*

**Chemistry**

In the reaction: P4 (S) +Cl2 (g)PCl5(s), 1. If you have 10.00 grams of Phosphorus to react with 220 grams of Chlorine gas, what would be the theoretical yield of PCl5(s), in grams? 2. Why was there condensation of the beaker of cold water when a blue flame was passes ...
*December 4, 2010 by Jerome*

**Computers**

Create a class named Checkup with fields that hold a patient number, two blood pressure figures (systolic and diastolic), and two cholesterol figures (LDL and HDL). Include methods to get and set each of the fields. Include a method named computeRatio() that divides LD ...
*April 18, 2007 by Andreah*

**Technology**

ok..so i have these labs in technology. and i'm on the first one. here's how it goes: ACTIVITY 1A-DESIGN PROBLEM Background: Technology is the application of knowledge to create machines, materials, or systems to help us make work esasiers, to make life more comfortable, or to...
*October 28, 2009 by y912f*

**Health**

This can be C. OR D. couldn't it be? A second hand statement? Dang! or even B. Keep running this through my head Which one of the following statements is an example of hearsay? A. I saw the doctor administer the injection. B. I checked the patient’s blood pressure three times...
*July 6, 2010 by Jessica*

**Psychology**

"I just can't make myself study ahead for a test. I work better under pressure. Perhaps it is the fear associated with waiting until the last minute that gets me going." This approach to motivation is best explained by: (Points: 5) incentive approaches. drive-reduction ...
*February 22, 2011 by Lisa*

**Chemistry **

1.00 g of sodium is added to a large excess of water under conditions of constant pressure (1.00 atm) and constant temperature (25 °C ). The following reaction occurs: 2Na (s) +2H2O (l)------> 2NaOH (aq) +H2(g) Delta H°rxn =-369 kJ/mol Calculate the heat released after 1.00...
*March 18, 2012 by Riley*

**Chemistry**

Snow forms in the upper atmosphere in a cold aid mass that is supersatuated with water vapor. When the snow later falls through a lower, warm air mass, rain forms. When atomic weight is 63.5 amu. Calculate the edge length of the unit cell.
*February 3, 2008 by Lauren*

**Chemistry**

Snow forms in the upper atmosphere in a cold aid mass that is supersatuated with water vapor. When the snow later falls through a lower, warm air mass, rain forms. When atomic weight is 63.5 amu. Calculate the edge length of the unit cell.
*February 4, 2008 by Lauren*

**eng physics**

in a downhill race a skier slides down a 40 degree slope. starting from rest how far must he slide down the slope to reach a speed of 130 km/hr. ignore air friction and assume the co effiecnt of kinetic friction between skies and snow is .1
*October 30, 2010 by anthony*

**chemistry**

1. In standard column chromatography, it is better to change from a nonpolar solvent to more polar solvent. What are some disadvantages if the reverse is done? 2. what would happen if air bubbles were trapped in the adsorbent in column chromatography? is it loss in resolution...
*November 8, 2010 by Anonymous*

**Physics**

A bat emits a chirping sound of frequency 67.0 Hz while moth hunting. The chirp lasts for 1.0 ms and then is silent. The beginning of the echo returns just after the outgoing chirp is finished - how close to the moth is the bat? Assume a cool night with air temperature of 10 ...
*November 30, 2010 by Dee *

**physics**

For specific heat and measuring 5 mL of air within a syringe and comparing while submerging in boiling water and ice water and extrapolating back, is your measurement of absolute zero close to the actual value (-273 °C)? How might you change the experiment to get closer to the...
*June 26, 2011 by Anonymous*

**physics**

An airplane is flying with a velocity of 86.0 m/s at an angle of 20.0^\circ above the horizontal. When the plane is a distance 119 m directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.How far from the dog will the suitcase ...
*September 12, 2011 by Anonymous*

**Physics**

A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt (2g*(3+.5)) V=sqrt(2)(9....
*February 26, 2012 by TRACY*

**physics**

A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt (2g*(3+.5)) V=sqrt(2)(9....
*February 27, 2012 by TRACY*

**PHYSICS**

A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt (2g*(3+.5)) V=sqrt(2)(9....
*February 28, 2012 by TRACY*

**Math**

The amount of nitrogen dioxide A in parts per million (ppm) that was present in the air in the city of Homer on a certain day in June is modeled by the function A(t) = -2t^2 + 32t + 12, where t is the number of hours after 6:00 A.M. Use this function to find the time at which ...
*June 14, 2012 by Bryce*

**Physics**

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 (B) both ends are open. The speed of sound through the air inside the organ pipe is 343m/s. (Hint: if a harmonic does not exist, it would not be heard.)
*July 10, 2012 by Kelsey*

**physics**

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 (B) both ends are open. The speed of sound through the air inside the organ pipe is 343m/s. (Hint: if a harmonic does not exist, it would not be heard.)
*March 28, 2013 by Help*

**math**

As dry air moves upward it expands and in doing so cools at a rate of 1 degrees Celsius for each 100 m rise up to about 12 km If the ground temperature is 20 degrees Celsius find an expression for the temperature T as a function of the height H the answer is T=20-10h(h in ...
*October 30, 2013 by jordan*

**Math**

As dry air moves upward it expands and in doing so cools at a rate of 1 degrees Celsius for each 100 m rise up to about 12 km If the ground temperature is 20 degrees Celsius find an expression for the temperature T as a function of the height H the answer is T=20-10h(h in ...
*November 3, 2013 by Jordan*

**ehh i have 25 mins please**

A scientist suggests keeping indoor air relatively clean as follows: Provide two or three pots of flowers for every 100 sq ft of floor space under a ceiling of 8 ft. If your classroom has an 8-ft ceiling and measures 35 ft by 40 ft, how many pots should it have?
*October 22, 2014 by Elizebeth taylor*

**chemistry**

The specific gravity of a sample of concentrated nitric acid is 1.42. What is the volume in liters at 20oC occupied by 145.3 g of this concentrate nitric acid?
*May 11, 2008 by Esmeralda*

**Calculus**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=x^2, x=y^2 about the axis x=–1
*October 30, 2008 by Sam*

**Calculus**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=x^2 x=y^2 about the axis x=–5
*April 29, 2009 by Anonymous*

**algebra**

Solve the indicated variable: 1. Volume of a cone: solve for h: V=¨ir^2h/3 2. Temperature formula: solve for C: F=9/5C+32 pleaseeeee help me solve these! plzzz! i have nooo idea how to do these. THANKS! =)))
*September 20, 2009 by kitty kat*

**science**

An unknown metal has a volume of 20cm^3 and a mass of 54g. What is the likely identity of the unknown metal? could i please have some help with this? ur help is appreciated. :D
*September 29, 2009 by becca*

**Chemistry**

A sample of H2 gas (12.28 g) occupies 100.0 L at 400.0 K and 2.00 atm. How much volume will a 9.49 g sample of H2 occupy at 353 K and 2.00 atm? a. 68.2 L b. 54.7 L c. 147 L d. 109 L e.77.3 L Is it a. 68.2 L?
*January 3, 2010 by Anonymous*

**chemistry**

If 100 mL of a 3 M solution of sodium hydroxide is diluted to a total volume of 600 mL with distilled water, what will the final concentration of sodium hydroxide be?
*February 17, 2010 by Brittany*

**7th grade**

VOLUME OF A TRIANGULAR PRISM WITH A BASE OF 4FT HEIGHT OF 18FT AND THE HEIGHT OF A PRISM IS 22 FT . THEN CHANGE YOUR ANSWER IN YARDS ! HELLPPP!
*April 12, 2010 by hillary*

**SCIENCE/CHEM**

the volume of a sample of gas is 650.ml at STP. what volumes will the sample occupy at 0.0degrees celsius and 950.torr??? is it 650.ml?
*May 12, 2010 by Andy*

**Chemistry**

Listerine mouthwash has 21.6% ethyl alcohol by volume. What mass of ethanol is contained in 20.0 mL of mouthwash ?! ( the density of ethanol is 0.789 g/mL.) how would yu do this problem ?!?!
*July 24, 2010 by Nicole*

**Calculus**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=0, y=x(3-x) about the axis x = 0
*August 2, 2010 by Grant*

**Chemistry**

The solute molecules mixed with the solvent molecules in a solution cause the freezing point of a solution to be ______ than it is for an equal volume of pure _________.
*August 21, 2010 by Cecilia *

**Chemistry**

A water solution containing 25.0% sucrose by mass, has a density of 1.25g/mL. What volume of this solution in liters, must be in an application requiring 2.50 KG of sucrose?
*September 27, 2010 by Kate*

**calculus**

An ice cube is melting so that its edge length x is decreasing at the rate of 0.1 meters per second. How fast is the volume decreasing when x = 2 meters?
*October 5, 2010 by nesri*

**calculus**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=4 x^2, x = 1, y = 0, about the x-axis
*December 9, 2010 by john*

**Calculus**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. x=4y^2, y=1, x=0 about the y-axis
*January 23, 2011 by anonymous*

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