Tuesday

September 16, 2014

September 16, 2014

Number of results: 27,874

**Chemistry**

N2 (g) + 3 CL2 (g) ---> 2 NCL3 (g) delta H = + 230 kj ----- a) What mass of N2 would absorb 96.5 kj of heat as it reacts? b) What volume of Cl2 at STP would be required to react with the N2 in part (a)?
*June 3, 2008 by Soba*

**math**

he volume of a shape is the number of cubes it will take ,all the same size , to make the figure. each figure is made of stacks of cubes that are 1 centimeter on each side .
*October 20, 2009 by john*

**Calculus**

Find the instantaneous rate of change of the volume V=(1/3) pi r^2 H (all put together) of a cone with respect to the radius r at r=a if the height H does not change. I truly appreciate all of ya'll help! Thanks!
*January 6, 2010 by Ryan*

**Grade 8 Geometry**

to calculate volume you use the formula V= area of b.s.(base area) x h(height) - How can I tell what face is the "base shape", especially with a triangular prism?
*May 15, 2010 by Selena*

**Find the Volume**

The diameter of a Sphere is 4.8 cm Use 3.14 and round to the nearest thousandth. A 57.876 cm3 B 463.012 cm3 c 289.382 cm3 d 72.346 cm3
*June 13, 2010 by Felicia*

**chemistry**

If 0.60 mg of KCl is present in 3.0 L of aqueous solution, what is the concentration in terms of molarity, weight/volume percent, parts per thousand, and parts per million?
*July 25, 2010 by Norma*

**Calc**

Express the surface area of a cube as a function of its volume. I did this and got A=6V^(2/3) That is the formula I got for the described function. However, I also need to find its domain... how do I do this?
*September 15, 2010 by Chelsea*

**college chemistry**

A volume of 0.285 L of a gas at STP weighs 0.537 g. Calculate the molar mass of the gas (1)(0.285) = n(0.0821)(273). .0036 is this correct?
*October 17, 2010 by Melissa *

**science**

individuals with diabetes mellitus produce urine that is concentrated and higher in volume than the urine of healthy individuals. Explain why these two characteristics are observed in diabetics.
*November 7, 2010 by Anonymous*

**chemisty **

what is the molarity of ZnCl2 that forms when 30.0 g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s)
*November 20, 2010 by melissa*

**chemistry urgent**

what volume in liters of gaseous hydrogen chloride can be prepared from 40.0 liters of hydrogen with an exces of chlorine? all volumes are measured at STP: H + Cl -> HCl
*November 30, 2010 by lianne*

**Chemistry**

NO(g) + CO2(g) <¡X> NO2(g) + CO (g) ƒ´H¢X = ¡V100 kJ Which of the following will favor the forward reaction?Why? A) add NO B) remove NO2 C) decrease the volume of the container D) raise the temperature E) add CO
*January 22, 2011 by Joshua*

**math**

If Juan can consume in one sitting one medium (12-inch diameter), deep-dish (1-inch thick) pizza, what is the minimum volume of his stomach?
*February 14, 2011 by jay*

**algebra**

If juan can consume in one sitting one medium(12-inch diameter), deep-dish (1-inch thick)pizza, what is the minimum volume of his stomach?
*February 19, 2011 by mike*

**Chemistry**

Stomach acid is 0.02M HCl. A 330mg antacid tablet is 41% magnesium hydroxide and 36.2% sodium Bicarbonate. What is the volume of acid that can be neutralized by one tablet?
*May 21, 2011 by Alex*

**Chemistry**

Stomach acid is 0.02M HCl. A 330mg antacid tablet is 41% magnesium hydroxide and 36.2% sodium Bicarbonate. What is the volume of acid that can be neutralized by one tablet?
*May 21, 2011 by Alex*

**Chemistry**

What volume of water would be required to dissolve 1 g of BaF2? mass of BaF2 is 1.31 g and it dissolves in 1 L of water. The answer is 0.763. Can someone please explain how they got this?
*June 11, 2011 by Kev*

**chemistry**

Make a buffer solution with the following specification pH=5.5 Volume=2L total concentration=1M ... a) Name the components?... b) How many grams of each component would you use to make 2L of solution
*July 25, 2011 by Anonymous*

**chemistry**

Make a buffer solution with the following specification pH=5.5 Volume=2L total concentration=1M ... a) Name the components?... b) How many grams of each component would you use to make 2L of solution
*July 25, 2011 by Anonymous*

**math**

the volume of an cylindrical can with a radius r cm and height h cm is 128000 c^3, show that the surface area of the can is A=2(22/7)r^2 + 246000/r. Find the value for r to minimize the surface area. *i know what the quest. ask but i do not know how to apply it.
*July 29, 2011 by Yuni*

**Calculus 2**

The volume of the solid generated by revolving the region about the given line. above the curve y=3 below the curve y=sqrt of 3x on the left by the y-axis the line y=3
*August 3, 2011 by Larry*

**physics**********************

true or false- if you only want a small volume of hot water, you should place the immersion heater near the bottom of the hot water tank?
*October 27, 2011 by rose*

**Chemistry**

The combustion of methane can be described by the equation: CH4 (g) + 2 O2 (g) -> CO2 (g) +2H20 (g) If 22.0 mL of CO2 (g) were collected, what volume of H20 (g) also could be collected under the same conditions?
*December 9, 2011 by Dani*

**Calculus**

Find the volume of the solid whose base is the region bounded by y=x^2 and the line y=0 and whose cross sections perpendicular to the base and parallel to the x-axis are semicircles.
*January 29, 2012 by Becca*

**earth/atmosphere**

my homework says a,b,and c represent gases what is a? a has 78.09 present by volume and i need to know what gas a stands for....i thought it was argon but argon is already a gas listed...HELP
*February 21, 2012 by Anonymous*

**geometry**

The surface area of a right rectangular prism is 112 sq units. The height is twice the width. The length is 4 units more than the height . Find the volume.
*February 22, 2012 by Piggy*

**physical science **

120ml of a solution whose concentration is 30g/ml was diluted with distilled water by raising its volume to 160cm3. Calculate the concentration of the new solution.
*February 25, 2012 by grace*

**calculus**

find the volume of the solid of revolution obtained by revolving the region bounded above by the curve y=f(x) = √16-x^2 and below by the curve y=g(x) from x=0 to x=x√2 about the x-axis
*March 3, 2012 by Anonymous*

**calculus**

find the volume of the solid of revolution obtained by revolving the region bounded above by the curve y=f(x) = √16-x^2 and below by the curve y=g(x) from x=0 to x=x√2 about the x-axis
*March 4, 2012 by help pleaseee*

**Math**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the x-axis? y=x^2 x=y^2 about the axis x=–2 here's what i did and it was incorrect V = 2pi [x+2][x^1/2 - x^2]dx from 0 to 1 V = 2 pi [2x^5/3 / 5 + 4x^3/2 / 3 - x^4/4 - 2x^3 / 3] V = ...
*April 28, 2012 by Katherine*

**Math ( Palette of Problem)s)**

A cone shaped paper cup has a height of 7 inches and a diameter of 5 inches. What is the volume of the cone round your answer to the nearest hundredth.
*May 21, 2012 by Tina Clark*

**physics**

A steel bowl has a mass of 14 kg and will displace a volume of 0.17m^3. What is the extra mass that can be added to the bowl before it will sink when floating in water of density 1000kg m^-3 ?
*August 6, 2012 by Rizal*

**chemistry**

An experiment requires 0.7 M NH3(aq). The stockroom manager estimates that 15 L of the base is needed. What volume of 15 M NH3(aq) will be used to prepare this amount of 0.7 M base? Answer in units of mL
*December 18, 2012 by lauren*

**chemistry**

An experiment requires 0.7 M NH3(aq). The stockroom manager estimates that 15 L of the base is needed. What volume of 15 M NH3(aq) will be used to prepare this amount of 0.7 M base? Answer in units of mL
*December 18, 2012 by lauren*

**Physics**

True or false?equal masses of two different gases placed in containers of equal volume at equal temperature must exert equal pressures
*January 21, 2013 by John*

**math**

Find the volume of a rectangular prism with the following dimensions: Length = 5 mm Base = 7 mm Height = 3 mm 142 mm2 105 mm2 126 mm2 130 mm2
*March 6, 2013 by question*

**math**

Find the volume of a rectangular prism with the following dimensions: Length = 5 mm Base = 7 mm Height = 3 mm 142 mm2 105 mm2 126 mm2 130 mm2
*March 6, 2013 by question*

**math**

Find the volume of a square pyramid with a base length of 9 cm and a height of 4 cm. 324 cm3 108 cm3 36 cm3 152 cm3 miss sue do you think it could be c
*March 6, 2013 by .*

**Chemistry I**

If 30.0 mL of 0.2 M nitric acid and 30.0 mL of 0.25 M solution of sodium hydroxide are mixed, what is the molarity of sodium nitrate? Assume that total volume of the solution after mixing is equal 60.0 mL.
*March 14, 2013 by Therese*

**Chemistry**

If the hydrogen volume reads 8.35 mL, what number of moles does the represent at STP (1 atm and 0oC)? How many moles of electrons were added to the solution to create 8.35 mL of hydrogen gas?
*April 22, 2013 by Anonymous*

**mathematics**

A can of aerosol deodorant has a cylindrical shape with a hemisphere on top. The diameter of the cylinder is 6cm and the height of the cylinder is 17cm.Calculate the total volume of the can of deodorant?
*July 23, 2013 by Katlego*

**Chemistry**

From a titration of KHP and NaOH. Determine the range in NaOH volume to achieve a relative standard deviation of less than 0.2%. Assume 800mg of KHP was used.
*September 14, 2013 by Mary*

**chemistry**

What volume of 0.714 M K3PO4 is required to react with 27 mL of 0.97 M MgCl2 according to the equation 2 K3PO4 + 3 MgCl2 → Mg3(PO4)2 + 6 KCl Answer in units of mL
*October 28, 2013 by Anonymous*

**Math - Calculus I**

Optimization Problem: Find the dimensions of the right circular cylinder of greatest volume inscribed in a right circular cone of radius 10" and height 24"
*December 5, 2013 by Alex*

**Physics**

A can of gasoline has a rectangular base with dimensions of 13.5 cm by 13 cm. If there are 3 liters of gasoline in the can, how much does the surface of the gasoline rise (in mm) in the can when the temperature is raised by 45C? The coefficient for volume expansion of gasoline...
*January 17, 2014 by Riley *

**math**

A storage tank has a radius of x + 5 metres and a height of x metres. Determine the dimensions of the tank if the volume is 192đ m3? . Round your answers to two decimal places.
*February 13, 2014 by sarah*

**Math (Calculus)**

Use the shell method to find the volume of the solid generated by revolving the plane region about the indicated line. y=4x-x^2, y=0, about the line x=5
*May 8, 2014 by Sherman*

**math**

a drug is supplied as a 20 mg/ml solution in a 50 ml vial. you need to make 15 ml of a 10 mg/ml solution. how much concentrate and how much diluent are needed to obtain the desired final volume?
*July 9, 2014 by kate*

**Economics**

Since the September 11th attack there has been an increase in the demand for security personnel—police, air marshals, airport security, etc. How do you think the higher demand has affected the equilibrium wage? In which direction do you think the labor supply and demand ...
*August 31, 2008 by Will*

**Physics**

A speed boat at rest begins to move in a straight line from a dock. The boat has a constant acceleration of +3.0 m/s squared. Attached to the dock is a siren that is producing a 755 Hz tone. If the air temperature is 20 degrees C, what is the frequency of the sound heard by a ...
*April 15, 2010 by Lenzen*

**Physics**

A projectile is launched from ground level to the top of a cliff which is 195 m away and 155 m high. If the projectile lands on top of the cliff 9.2 s after it is fired, find the initial velocity of the projectile (magnitude and direction). Neglect air resistance. Also ...
*September 23, 2010 by Sam*

**Physics**

A student throws a baseball at a large gong 73 m away and hears the sound of the gong 1.7744 s later. The speed of sound in air is 330 m/s. What was the average speed of the base- ball on its way to the gong? (For simplicity, assume its trajectory to be a straight line.) ...
*May 8, 2011 by Leslie*

**science**

We were having a discussion while watching the weather channel. If portions of Oklahoma have temperatures from the 30's to the 50's and another portion of oklahoma had temperatures upper 70's and 80's and finally another section of Oklahoma low 60's to upper 70's. What are ...
*October 9, 2011 by tgsd*

**phisics**

A projectile is fired horizontally from a gun that is 45m above flat ground, emerging from the gun with speed 250m/s How long does the projectile remain in the air? At what horizontal distance from the firing point does it strike the ground?.What is the magnitude of the ...
*October 10, 2011 by Shanice*

**AP Physics B**

A soap bubble of index of refraction 1.43 strongly reflects both the red and the green components of white light. What minimum film thickness allows this to happen? (In air,the wavelength of red light is 703 nm, of green light 502.143 nm.) Answer in units of nm
*February 19, 2013 by Daisy*

**physics**

A student throws two beanbags in the air, one straight up and the other one at a 30° angle from the vertical. Both beanbags are thrown with the same initial velocity and from the same height. In your own words, explain which one will come back and hit the ground first and why.
*March 11, 2013 by ella*

**Physics**

A student throws a baseball at a large gong 45 m away and hears the sound of the gong 1.35258 s later. The speed of sound in air is 330 m/s.What was the average speed of the base- ball on its way to the gong? (For simplicity, assume its trajectory to be a straight line.) ...
*September 29, 2013 by Tristan*

**Science**

Can someone help me answer some questions. Homes near warm climate get a) colder winters b)warmer winters c) cold and warm winters d) none of the above When there is moisture in the air from a hot shower, the water is in which form: a) solid b) liquid c) gas d) all of the above
*May 3, 2014 by Anna*

**Science **

I need help answering the questions below : Homes near warm climate get a) colder winters b)warmer winters c) cold and warm winters d) none of the above When there is moisture in the air from a hot shower, the water is in which form: a) solid b) liquid c) gas d) all of the above
*May 3, 2014 by Annadona*

**physics**

The captain of a plane wishes to proceed due west. The cruising speed of the plane is 226 m/s relative to the air. A weather report indicates that a 32.0-m/s wind is blowing from the south to the north. In what direction, measured with respect to due west, should the pilot ...
*September 10, 2014 by Anonymous*

**density**

calculate the mass of a substance whose density is 0.2g/cm3 and whose volume is 45cm3
*April 22, 2008 by aaliyah ward*

**math**

The volume of a rectangular prism is 2x^3+5x^2+x-2. The height of the prism is 2x-1, and the length of the prism is x+2. Find the width of the prism.
*March 10, 2010 by kev*

**Chemistry**

The Specific Gravity of kerosene is 0.786. What is the volume occupied by 7.75kg of kerosene? Is it 7.75/0.786?
*September 20, 2010 by Natalie*

**Chemistry**

The Specific Gravity of kerosene is 0.786. What is the volume occupied by 7.75kg of kerosene? Is it 7.75/0.786?
*September 20, 2010 by Natalie*

**chemistry**

you have 23- grams sample of ethanol with a density of 0.7893g/ml what volume of ethanol do you have?
*September 27, 2010 by trice*

**science**

What volume of .01M KOH solution is needed to react with 20ml .01M Zn(OH)2 solution
*May 19, 2011 by Anthony*

**geometry**

A cylinder is inscribed in a cube. If the edge of the cube is 3" long, find the volume of the cylinder.
*June 14, 2011 by Anonymous*

**chemistry**

A syringe containing 1.50 mL of oxygen gas is cooled from 92.3°C to 0.0°C. What is the final volume of oxygen gas?
*October 30, 2011 by Anonymous*

**Science**

"a glass of water is at 60 degrees C if the temperature of water drops to 40 degrees C its specific volume will?
*November 7, 2011 by John Wilson*

**Chem**

Seawater contains approximately 3.5% by mass and has a density of 1.02 g/mL. What volume of seawater contains 5.5g of sodium
*November 14, 2011 by Haley *

**Biology**

If the concentration of a sample is 81.5ng/ul, What is the volume needed to concentrate the sample to get a concentration of 200 ng/ul?
*December 8, 2011 by Moli*

**Chemistry**

What volume of 6.00 M nitric acid is needed to prepare 250. mL of 0.750 M nitric acid?
*February 9, 2012 by John*

**density**

which has more density a 50g. ball or an 80g. ball if they have the same volume
*March 22, 2012 by gfhgdfg*

**Chemistry**

If you have 200ml of 25% aqueous solution of ethanol, what volume of ethanol and water are in the solution?
*March 3, 2013 by JD*

**math**

A cylindrical pop canis 12.5 centimeters tall and 5.5 centimeters wide. What is the volume of the pop can?
*March 3, 2013 by Me*

**physics**

A hot air balloon has just lifted off and is rising at the constant rate of 1.8 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 11.2 m/s. If the passenger is 2.5 m ...
*September 16, 2010 by jack*

**Moles**

i was practicing some advanced level questions and i came across this one On heating with soda lime, sodium ethanoate decomposes in accordance with the following eqn CH3COONa + NaOH ----> CH4 + Na2CO3 iF 8.2g of sodium ethanoate produced 560 cm^3 of methane (at stp (...
*November 15, 2006 by Kim*

**Chem**

A student placed a mixture of BaO and CaO in a 1.46L flask containing carbon dioxide at 35C and 746mmHg. After the reactions were complete she found that the CO2 pressure had dropped to 2.40 x 10^2mmHg. How many moles of CO2 were consumed in the reactions? Assume volumes of ...
*March 3, 2010 by Staci*

**Chemistry **

The nuclide 38cl decays by beta emission with a half life of 40min. A sample of .40 m of H38cl is placed in a 6.24 liter container. After 80 min the pressure is 1650 mmHg. What is temperature of container? I have tried calculating the decay rate of the 38cl and then plugging ...
*July 21, 2013 by Nancy*

**soil mechanics**

total normal stresses of 110 and 40 kpa are applied to two planes at right angles in an element of soil. the shear stress acting on those palnes is 20 kpa. what must be the value of the pore pressure in the element if the minor principle stress in the elemnt is to be zero?
*September 19, 2010 by nick*

**Chemistry**

If there are 2L of H2 gas at .625 atm, and 1L of N2 gas at .200 atm isolated in two flasks, what are the final partial pressures of each, and the total pressure, after the valve between the two flasks has been opened and the gases are allowed to mix? Is this simply a ratio ...
*April 7, 2013 by Lily*

**physics **

3 beakers are being heated (small, medium and large). consider the first two. both beakers are filled with water and heated for 10 minutes. after about 3 minutes the water in the small beaker the water in the small beaker is boiling; after 8 minutes the water in the large ...
*November 4, 2011 by lissa*

**Chemistry Please Help!!!**

Airbags contain a mixture of sodium azide, potassium nitrate, and silicon dioxide. A sensor detects a head on collision that cause the sodium azide to be ignited and to decompose forming sodium and nitrogen gas. This gas fills a nylon or polyamide bag such that the front face ...
*July 25, 2014 by Annie*

**physics**

A horizontal water main with a cross-sectional area of 206 cm2 necks down to a pipe of area 42.4 cm2. Meters mounted in the flow on each side of the transition coupling show a change in gauge pressure of 71.0 kPa. Determine the flow rate through the system, taking the fluid to...
*April 9, 2012 by katie *

**physics**

A hand-driven tire pump has a 2.50 cm diameter piston and a maximum stroke of 31.0 cm. (a) How much work (J) do you do in one stroke if the average gauge pressure is 2.40 multiplied by 105 N/m2 (about 35 psi)? (You may consider this an isothermal process.) (b) What average ...
*July 24, 2013 by Eric*

**Geography**

I dont get any of it! Assume that a parcel of air is forced to rise up and over a 6000-foot-high mountain (see page 79 in the Laboratory Manual). The initial temperature of the parcel at sea level is 76.5°F, and the lifting condensation level (LCL) of the parcel is 3000 feet. ...
*July 15, 2013 by CNM*

**science**

what method of separation would do the best job to separate sand and water? hint* What would happen to the water if you put the mixture of sand and water in a pan and heated it on a stove for quite a long time? What's it called when water goes into the air?
*June 21, 2006 by jenna*

**Physics**

A skater with an initial speed of 7.6 m/s is gliding across the ice. Air resistance is negligible. The coefficient of kinetic friction between the ice and the blades is 0.1. a) Find the acceleration caused by kinetic friction and b) how far will the skater travel before coming...
*October 22, 2009 by Samantha*

**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 air hose, and 2/3 of the total length remains on the reel. What is his maximum working depth without a change of equipment?
*December 10, 2009 by Din*

**Physics**

A hot-air balloon is rising straight up with a speed of 5 m/s. A ballast bag is released from rest relative to the balloon when it is 8.2 m above the ground. How much time elapses before the ballast bag hits the ground? I don't get what equations or what values to use for this...
*September 10, 2010 by Jerry*

**physics**

A 90g arrow is shot straight up into the air with a spped of 23 m/s. It reaches a maximum height of 25.9898m. Find the initial kinetic energy. the acceleration of gravity is 9.8 m/s2. Answer in units of J. Find the potential energy at its highest position. Answer in units of J.
*October 21, 2010 by Deb*

**physics**

a pair of glasses is dropped from the top of a 36.0 m high stadium. a pen is dropped from the same position 2.21 seconds later. how high above the ground is the pend when the glasses hit the ground? (disregard air resistence. a=-g=-9.81 meters per second squared)
*November 11, 2010 by PHYSICS HELP*

**Math**

The height of a golf ball that is hit into the air with an initial vertical velocity of 112 feet per second is given by the equation h=-16t^2 + 112t, where t is the time in seconds. After how many seconds is the ball at a height of 96 feet above the ground?
*May 5, 2011 by Diana*

**science 207**

chronic asthms when caused by air p[ollution is ,most likely due to: short term pollutant exposer long term pollutant exposer thbe weather during an episode of pollutant expossure exposure to a cerain kind of pollutant
*March 24, 2013 by sarah*

**physics**

Helium balloons are used regularly in scientific research. A typical balloon would reach an altitude of 45.0 km with an air density of 4.3×10−3 kg/m3. At this altitude the helium in the balloon would expand to 540000.0 m3. Take g=10 m/s2. Find the buoyant force on the ...
*December 14, 2013 by Anonymous*

**chem**

Commerical hydrochloric acid is 37% by mass HCl and has a solution density of 1.18g/mL. What minimum volume of hydrocloric acid is needed to dissolve 16g Al. The balanced equation is 2Al + 6Hcl --> 2AlCl3 + 3H2
*November 21, 2007 by Anonymous*

**chemistry**

What is the pH value if you take into account that the 8.00 mL of 0.10 M HCl was first diluted with 100 mL of water and titrated with 1.60 mL of the 0.10 M NaOH i know that the concentration of HCl after diluting is .008M but than im not sure how to convert that to mols which ...
*May 4, 2008 by Jason*

**science**

suppose a cube of jell-o is cut into two pieces. What property stays the same when comparing the original piece with one of the new pieces? a. density b. mass c. volume d. surface area
*February 13, 2009 by Lorena*

**OChem**

Anhydrous conditions are vital for a successful Grignard synthesis. To demonstrate this point calculate the mass of the water it would take to destroy the phenylmagnesium bromide you will synthesize. What is he volume of this amount of water? -How exactly do you do this?
*March 2, 2009 by Kristy*

**chemistry**

Oxygen gas reacts with powdered aluminum according to the following reaction: 4Al(s)+3O2(g) yields 2Al2O3(s) What volume of gas (in L), measured at 770 mmHg and 35 degrees C, is required to completely react with 53.9g of Al?
*March 8, 2009 by rusty*

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