Monday
August 3, 2015

Search: 0.65 of argon gas is admitted to an evacuated 60 container at 60 . The gas then undergoes an isochoric heating to a temperature of 500 .

Number of results: 24,340

Chemistry
Calculate the work done when 70.0g of tin dissolves in excess acid at 3.00 atm and -15.0 C. Sn(s)+2H^+(aq) -> Sn^2+(aq)+H2(g) Assume ideal gas behavior. Any ideas? I've come up with a few different answers and can't come to a conclusion. I see the following energies ...
September 15, 2006 by Doug

Science
I'm trying to figure out the ratio of floor to window space needed for passive solar heating...some sources say windows should be equivalent to 8% of the floorspace, others 80%? What do you think is the most realistic?
April 11, 2011 by Heather

Chemistry
Suppose a mixture of hydrogen and oxygen gas is exerting a pressure of 1.60 atm. If the partial pressure of oxygen in the mixture is 304 mmHg atm, what is the partial pressure of the hydrogen?
November 5, 2010 by Amber

chemistry
The heat lost or gained by a system is related to its temperature change by a property called its heat capacity. The molar heat capacity of metals at or above room temperature equals 24.92 J/K.mol. The temperature of a block of lead (MM 207.2) was raised by 13.1 degrees when ...
September 25, 2014 by korko

Economics
P=MR+$750 TC =2,500,000+500q+0.005Q^2 (squared) Mc =500+0.01Q Calculate profit maximizing level Calculate the company's optimal profit and optimal profit as a percentage of sales revenue Can anyone help here I am lost
April 6, 2007 by Jeff

Math
A manufacturer can produce 8,500 units for a total profit of 47,600.00 dollars, but if he increases his production to 11,500 units, then his profit becomes $65,600.00. It follows that his fixed cost is? and his net profit per unit produced is?
January 27, 2011 by Mark

science (very important)!!!!
Calculate the final concentrations in mol/L of H+, Na+, Cl- and SO42- when the following three solutions are mixed together: 1000 cm3 of 0.10 mol dm-3 HCl 500 cm3 of 0.20 mol dm-3 NaCl 500 cm3 of 0.20 mol dm-3 of Na2SO4
June 23, 2012 by Hadeel

Physical Science
The static frictional between a 500 kilogram box of bricks and the floor is 500 Newton’s. The kinetic frictional force in only 220 Newton’s. How many Newton’s of force must a worker exert to get the moving?
September 26, 2012 by Tala

physics
a block of mass 0,5kg is attached to a spring.The spring is compressed to a distance of 0,1m .The block is released .The block moves 0.07m past the eequilibrium position .What is the force of friction that does work on the block? spring const is 500. F -kx -500 x .07
August 29, 2014 by ruby

physics
an electric heating element is conneceted to a 110V circuit and a current of 3.2 a is flowing through the element. How much energy is used up during a period of 5 hours by the element?
March 11, 2012 by kimberly

Math
A Norman window has the shape of a rectangle surmounted by a semicircle. (Thus, the diameter of the semicircle is equal to the width of the rectangle.) If the perimeter of the window is 30 ft, find the dimensions of the window so that the greatest possible amount of light is ...
November 23, 2013 by Lenny

ecology
I have a Data Analysis Lab that has a graph attached to it. It talks about how temperature affects the growth rates of the two species'. It says that researchers studied the effect and they hypothesized that increasing temperature would increase the growth rate. However, in ...
September 25, 2013 by Z

chemistry
If 890 mL of 0.236 M aqueous NaI and 0.560 mol of liquid Br2 are reacted stoichiometrically according to the balanced equation, how many moles of liquid Br2 remain? Round your answer to 3 significant figures. 2NaI(aq) + Br2(l) ˇć 2NaBr(aq) + I2(s) Molar Mass (g/mol) NaI 149.89...
June 2, 2010 by Judy

Accounting
*I don't know where to begin, please HELP* Use the following adjusted trial balance of Webb Trucking Company to prepare a classified balance sheet as of December 31, 2005. Account Title Debit Credit Cash . . . . $ 7,000 AR . . . . . 16,500 Office Supply 2,000 Trucks . . . 170,...
February 25, 2009 by Precious

physics
When water falls from the top of the waterfall,at the victoria falls in zimbabwe,the temperature of the water at the top is less than the temperature at the bottom.If 180.5g of water falls a distance of 125.0m, calculate the increase in temperature of the water ,when it ...
July 16, 2011 by Gift

PHYSICS
An object is attached to an ideal spring. It undergoes a simple harmonic motion with a total energy of E = 2.2 J. The amplitude of the motion is 0.7 m and the maximum speed of the object is 0.5 m/s. Find the spring constant.
April 7, 2011 by Unknown

Chemistry
Uranium-235 can be separated from U -238 by fluorinating the uranium to form UF 6 which is a gas) and then taking advantage of the different rates of effusion and diffusion for compounds containing the two isotopes. Calculate the ratio of effusion rates for 238 UF 6 and 235 UF...
August 10, 2013 by Anonymous

Math
How can you tell which fractions represent a umber that is less than 1% without doing any computation? .02/5, .2/5, 2/5, 2/50, 2/500. I know the numbers less than 1% are .02/5 and 2/500, but how do you know without doing the computation
March 17, 2015 by Kaashif

chemistry
If 11.5 g of CCl_3F is enclosed in a 1.2L container, will any liquid be present?
April 13, 2010 by Anonymous

math
the volume of a container that is 8'' long , 4 '' deep, and 3'' high is _ cu in. ???
June 3, 2011 by jay

math
a container holds 250 mL. How many liters does it hold
September 22, 2011 by gina

Chemistry
Can a solution of CrCl3 be stored in an aluminum container?
May 15, 2012 by Jake

chemistry
Can a solution of CrCl3 be stored in an aluminum container?
May 11, 2013 by lea

chemistry
cold water mass of calimeter+ water: 68.66g mass of calimeter: 19.19g mass of water: 49.47g final temperature of water: 39.1C initial temperature of water: 25.5C delta(T) of water: 13.6C hot water mass of calimeter+ water: 79.55g mass of calimeter: 20.61g mass of water: 58.94g...
November 30, 2011 by Yuli

Chemistry
A sample of 2.08 grams of Z is dissolved into 500 grams of water which is in a styrofoam coffee cup. The temperature is monitored and is found to rise from 25.682◦C to 25.899◦C. What is ∆Hsolution for substance Z? Assume no heat is lost/gained by the ...
September 21, 2013 by John

Math - Algebra word problem
Ace manufacturing has determined that the cost of labor for producing x transmissions is L(x) = 0.3x2 + 400x + 550 dollars, While the cost of materials is M(x) = 0.1x2 + 50x + 800 dollars. Write a polynomial T(x) that represents the total cost of materials and labor for ...
November 14, 2009 by Ashley

Chemistry
Can someone walk me through how to work this I have no clue where to start. I have converted grams to moles and Celsius to kelvin but I don't know where to go from there. Thank you! A piece of dry ice (solid CO2, d = 0.900 g/mL) weighing 21.0 g is placed in a 0.870 L bottle ...
October 4, 2013 by James

physics
A dog sits 2.1 m from the center of a merry-go-round. If the dog undergoes a 1.4 m/s2 centripetal acceleration, what is the angular speed of the merry-go-round?
March 19, 2012 by Anonymous

physics
A 6.0-kg object undergoes an acceleration of 2.6 m/s2. (a) What is the magnitude of the resultant force acting on it? N (b) If this same force is applied to a 12.0-kg object, what acceleration is produced? m/s2
September 26, 2012 by Anonymous

New Age Math
A manufacturer can produce 8,500 units for a total profit of 47,600.00 dollars, but if he increases his production to 11,500 units, then his profit becomes $65,600.00. What is the fixed cost and net profit per unit produced is?
January 28, 2011 by Tracy

Physics
1. A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and (b) the average speed. 2. Sam travels by car from one city to another. He drives for 45.0 min at 95.0 km/h, 30.0 min at ...
June 24, 2014 by Jade

Chemistry
At 25 degrees C and 1 atm gas pressure, the solubility of CO2(g) is 149 mg/100 g water. When air at 25 degrees C and 1 atm is in equilibrium with water, what is the concentration of dissolved CO2, in mg/100 g water? Air contains 0.037 mol % CO2(g). the answer should come out ...
February 18, 2013 by Jacqueline

Chemistry
Methane gas (carbon tetrahydride) reacts with oxygen by combustion: CH4 + 2O2 -> CO2 + 2H2O a.)How many moles of methane are needed to produce 3.5*10-4 moles of carbon dioxide? b.)How many moles of oxygen are needed to react form the 3.5*10-4 moles of carbon dioxide? c.)How...
November 3, 2013 by Kelsi

Business Analysis
Mahalyk's Water Fun Shoppe specializes in jet skis. Mahalyk's inventory records showed the following for the past year. Purchase Date Number of Jet Skis Cost Per Jet Ski February 10 30 $4,000 May 12 80 $3,000 June 15 20 $3,500 July 20 15 $2,500 Use the FIFO method to determine...
February 13, 2013 by Anna

English
The Crucible 1. Compare the roles that elizabeth proctor and abigail williams play in the crucible? 2. What kind of government does salem have? What role does it play in the action? 3. Discuss the changes that reverend hale undergoes in the course of the play.
June 5, 2010 by Mary

chemistry
what would the equation be for: heating of iron III hydroxide crystals --> iron III oxide + water vapor
October 4, 2011 by Kitsune

Chemistry
Upon heating 134 g MgSO4 · 7 H2O: (a) how many grams of water can be obtained? (b) how many grams of anhydrous compound can be obtained?
May 26, 2015 by Mark

chemistry
when chlorine gas is bubbled into a solution of sodium bromide, the sodium bromide reacts to give bromine a red brown liquid and sodium chlorine. A solution was made by dissolving 20.0g of sodium bromide in 100.0 g of water. After passing through the solution, it contained 16....
September 17, 2012 by Anonymous

chemistry
when chlorine gas is bubbled into a solution of sodium bromide, the sodium bromide reacts to give bromine a red brown liquid and sodium chlorine. A solution was made by dissolving 20.0g of sodium bromide in 100.0 g of water. After passing through the solution, it contained 16....
September 17, 2012 by Anonymous

Chemistry
time(s) 30 60 120 180 240 300 420 480 t(*c) 13.8 13.8 13.9 13.1 14.2 14.3 14.5 14.7 14.8 b. if t1= 24.5*c, T2= 1.5*C, tr= 23.6*c, and with the tf obtained from the plot, determine Ccal, in J/*C, if the procedure descrived in the laboratory is followed. 3.when 0.600g of metal ...
April 14, 2011 by Daniel Medaris

Physics
Two point charges q1 and q2 are held 4.00 cm apart vertically. An electron released at the middle point that is equidistant from both charges undergoes an initial acceleration of 8.95 X 10^18 m/s2 directly upward,parallel to the line connecting q1 and q2 .Find the magnitude ...
September 7, 2009 by sandhu

Physics
Two point charges q1 and q2 are held 4.00 cm apart vertically. An electron released 3 cm from the middle point that is equidistant from both charges undergoes an initial acceleration of 8.95 X 10^18 m/s2 directly upward,parallel to the line connecting q1 and q2 .Find the ...
September 7, 2009 by sandhu

science
1mole of liquid water at 25 c and 1 atm forms 1 mole of steam at 100 c and 1 atm. the molar heat capacity of water 373 k is 40.79kj/mol and the molar heat capacity of water is 75.3 J. assume ideal gas behavior for steam. Calculate delta U, delta H and delta S
March 29, 2013 by bob

Chemistry
on heating the hydrate CaSO4*2H2O, how many moles of water should be driven off per mole of hydrate? 1 mole?
November 8, 2009 by c

chemistry
Acids that form ionic solutions will conduct electricity. Acids that form covalent solutions will not conduct electricity. but acids have HYDROGEN in them and hydrogen is a gas is that why the results of the conduction test need to be changed because hydrogen is a non metal ...
November 1, 2008 by lila

Chemistry
If 35.0 mL of 0.210 M HCl reacts with excess Mg, how many mL of hydrogen gas are produced at STP? Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) Is the answer 0.8176 L Convert moles of HCl: 2.10 x 0.035= 0.00735 mol of HCl Convert to moles of H2: 0.0735 x 1 mol H2/ 2 mols HCl= 0....
November 24, 2014 by Mike

Chemistry (PLS HELP ASAP)
What is the molecular weight of a gas if a 15.0g sample has a pressure of 836 mm Hg at 25.0 degrees C in a 2.00 L flask? a)167 b)1.35 c)176 d)11.1 e)none of the above Please explain... I need to understand how to do this. Thanks. I know that I have to use PV=nRT, then solve ...
January 11, 2010 by coug

Chemistry
Consider the gas-phase transfer of an electron from a sodium atom to a chlorine atom: Na(g)+Cl(g)-->Na^(+)(g)+Cl^(-)(g) I was able to write the reaction that relates to an ionization energy and that relates to an electron affinity. I broke it up into: Na(g)--> Na^(+)+e...
November 3, 2012 by Ezra

ap chemistry
what does H2 + CH2 form? (what product?) What is CH2? There is a (CH)2 but I don't know of a CH2. Yes, I meant to ask: What product is formed by this reaction: H2 + (CH)2 My original answer is gone but I will repost. (CH)2 is HCtriplebondCH which is acetylene. H2 gas adds ...
October 29, 2006 by sara

Stoichiometry
I am taking an online chemistry class and I do not at all understand how on earth how to do stoichiometry. I just dont get it, its not that I dont know how to do the math, but figuring out how to ger the information. PLEASE HELP!! When 11.7 grams of iron and 212.7 grams of ...
July 10, 2008 by Kesiah

chemistry
For OCTANE, what is the ratio of Carbon atoms to Hydrogen atoms in a molecule? It's specified that Octane undergoes complete combustion to form 8L of Carbon Dioxide & 9L of Water at constant temp and pressure. thanks :)
September 24, 2010 by kelly

Medical Billing and Coding
Patient is admitted for radiation therapy for metastatic bone cancer, primary unknown. Patient develops severe vomiting secondary to the course of radiation and is kept an extra day for stabilization. V Code: ____________________ Diagnoses Codes: ___________________, ...
December 14, 2011 by Terry Davis

CHEM HELP!
NH4HS<-->NH3+H2S What is the minimum mass of NH4HS that must be added to the 5.00-L flask when charged with the 0.300g of pure H2S, at 25C to achieve equilibrium?? Kp=.120 at 25C initial pressure of H2S in flask = .0431atm partial pressures of H2S and NH3 .326, .369 mole...
March 12, 2012 by student

PHYSICS PLEASE HELP
A large balloon of mass 237 kg is filled with helium gas until its volume is 318 m3. Assume the density of air is 1.29 kg/m3 and the density of helium is 0.179 kg/m3. (b) Calculate the buoyant force acting on the balloon. ____________N (c) Find the net force on the balloon and...
November 8, 2012 by AMY

Chemistry
If you have two containers with water, one with water at 25 degrees C and the second with water 75 degrees C, explain in which one would you be able to dissolve less CO2 (a gas)? Explain in which one you would be able to dissolve more NaCl (check the solubility curve)?
April 29, 2008 by Cori

chemistry
Ammonium chloride and sodium nitrite react to form sodium chloride, water and nitrogen gas. If 6.33 moles of ammonium chloride react with sodium nitrite, how many grams of sodium chloride will be produced?
January 29, 2014 by Julie

heat
if the absolute pressure of a gas is 550.280 kpa, it's gage pressure is what? http://www.ajdesigner.com/phppressure/fluid_pressure_equation_absolute_gauge.php
August 13, 2005 by missy white

Physics
A conduction heat wave is caused to pass through a metal bar of average temperature Tmean = 36 degrees altering its temperature sinusoidally with an amplitude of Ti=2 degrees. The equation which gives the temperature T(x.t) of the metal bar at any place x(in metres) inside it ...
April 15, 2011 by Michaela

calculus
A cold metal bar at -30 degrees Celsius is submerged in a pool maintained at a temperature of 40 degrees Celsius. Half a minute later, the temperature of the bar is 20 degrees Celsius. How long will it take the bar to attain a temperature of 30 degrees Celsius? I know that dy/...
March 14, 2010 by Debbie

science
Why is a heating element with a thermostat placed on the bottom of an aquarium? To heat the water. Heat rises so you would put it at the bottom of the tank.
November 2, 2006 by kelli

physics
a car traveling at 30.0m/s undergoes a constant negative accerleration of magnitude of 2.00m/s^2 when the brakes are applied. how many revolutions does each tire make before the car comes to a complete stop,assuming thaat the car does not skid and that the tires have radii of ...
February 23, 2009 by nay

Chemistry
Magnesium metal reacts with hydrochloric acid to form magnesium chloride and hydrogen gas. Suppose we react an excess of magnesium metal with 13.2 mL of a 3.00 M solution of hydrochloric acid and collect all of the hydrogen in a balloon at 25oC and 1.00 atm. What is the ...
May 5, 2011 by Priya

chemistry
If 8.29 L of gaseous Cl2 measured at STP and 0.380 mol of liquid CS2 are reacted stoichiometrically according to the balanced equation, how many moles of liquid CS2 remain? CS2(l) + 3Cl2(g) ˇć CCl4(l) + S2Cl2(l) Molar Mass (g/mol) Cl2 70.906 CS2 76.143 CS2 1.26 Molar Volume (L...
June 2, 2010 by Judy

Math
At the end of the first quarter of 2006, all the major stock market indexes had posted strong gains in the past 12 months. Mass Mutual Financial Group credited the increases to solid growth in corporate profits. The mean one-year return for stocks in the S&P 500, a group of ...
August 31, 2011 by Branden

physics
A 2000 watt heating element is connected in parallel to a 100 watt bulb across 200 volt source. Determine the total power and heat generated in the combination for 1.5 hours. help!
February 10, 2013 by nitz

Chemistry
In a heating and cooling curve, I understand that the flat part means that the bonds are either forming or breaking, depending on if the input of energy is increasing or decreasing, but what is happening to the bonds in the slanted parts? Thanks!
March 19, 2014 by Serena

Marketing Management
What are some key issues /opportunities for Subway Resturant Please check reliable sources about this company's business plans and finances. It's in a highly competitive field of fast food. What can it do to stand out and attract more customers? In out area, Subway has ...
January 12, 2007 by zeta

P.E. help
1. The 3 Rs stand for: reduce,reuse, and A. Replicate B. Recycle*** C. Redo D. Regulate 2. Conservation is the protection and preservation, of A. The natural enviornment***: B. Industries C. Farm land D. Residental areas 3. Which of the following is a non-renewable resource? A...
December 14, 2014 by callie

medical billing
what codes are assigned for a patient admitted for an azathiopring i drug induced aplastic anemia? the patient has peripheral neuropathy of multiple joints of the lower extremities secondary to severe rheumatoid arthritis. icd 9 cm diagnosis codes with poa indicator and ms-drg...
July 25, 2013 by Anonymous

Math
An object is heated to 90 degrees Celcius and is then allowed to cool in a room whose air temperature is 25 degrees celcius. If the temperature of the object is 75 degrees celcius after 10 minutes, when will its temperature be 50 degrees celcius?
November 22, 2010 by Hannah

Biology
I'm so horrible at biology so help is appreicated; "The following experiment is to test the limits of cell population growth. Cells were grown in six flasks under different conditions. Eash flask contained a nutrient broth of the same concentration. The table below shows the ...
January 15, 2008 by Lindsay

Hard Calculus
A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase as the dose ...
November 9, 2008 by George

Chem
Find the constants (a and b) for O2 in Table 5.7. Use the Van der Waals equation to determine the pressure of 1.000 mole of O2 if the gas occupies 22.50 liters at 27.00 oC. First, find the values for each of the two terms in the equation, then find the difference. Show all ...
October 11, 2014 by Feather

phys
A 10.9-g iron bullet with a speed of 4.00 102 m/s and a temperature of 20.0° C is stopped in a 0.400-kg block of wood, also at 20.0° C. (a) At first all of the bullet's kinetic energy goes into the internal energy of the bullet. Calculate the temperature increase of the bullet...
April 26, 2012 by opp

chemistry
assuming that the calorimeter contains 5.00 * 100 g of water and that the initial temperature is 30.0 degree celcius. what will the final temperature be? (use the proper formula and units, and show your work below)
October 9, 2007 by alice

Calculus
Recorded data indicates that on a recent date t hours past midnight, the temperature at Logan airport was f(t) = 14sin(1/3t-2) + 60 degrees Fahrenheit. What was the average temperature between 9 am and noon?
February 1, 2011 by Aviana

chemistry
A thermometer scale is calibrated (marked off) in a degree Celsius from 1 oC to 50 oC. Determine how many significant figures should be used to express the outdoor temperature if the temperature is more than 1 oC and less than 10 oC: (A) 1 (B) 2 (C) 3 (D) 4
July 15, 2013 by Janaiby

Algebra
Temperature AF 40 1000 60 1840 70 2260 85 2890 Find a linear model for the number of acre-feet of water that evaporate as function of temperature. E(T)= Is the answer E(T)=42T-960?
October 27, 2014 by Patricia

chemistry
The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 C is 410 s, what is the value of the rate constant k? If the initial concentration of dinitrogen pentoxide in an expt at 55 ...
March 11, 2009 by jen

ap chemistry
Jeff and Jill go canoeing. While reaching to feed a duck, the boat flips. Jeff and Jill blow up their inflatable life preservers and then put them on. As they wait for the rescue squad, they calculate how much nitrogen is in each life preserver. They estimate that the volume ...
February 9, 2013 by cheri

math
On Saturday, Alberto filled his right rear tire with air at the gas station around the block from where he lives. Three days later the tire pressure in that tire measured 26 psi (pounds per square inch). On the following Saturday, one week after he had originally filled the ...
August 7, 2014 by Jeffery

math calculus
In an experiment a persons body temperature is given by T=310-(7/9)^n where n is the number of minutes after in an experiment a persons body temperature is given by T=310-(7/9)^n where n is the number of minutes after the start of the experiment and T is the temperature in ...
November 26, 2012 by rima

Organic Chemistry
isopentyl alcohol is reacted with acetic acid to make isopentyl acetate through Fischer esterification. Sulfuric acid is used to assist the reaction. After the reaction, the solution is washed with sodium bicarbonate. What reactions take place during this washing? What gas is ...
July 22, 2008 by chemstudent

Chemistry
Assume that gas mileage is proportional to the total energy released upon combustion of fuel. Use your results in question 2 (Ethanol=88,800 kJ/gal n-Octance=105,000 kJ/gal) to determine the ratio of ethanol /n-Octane required, in gallons to drive equal distances. How much ...
December 7, 2012 by Jenifer

Calculus
A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase as the dose ...
November 9, 2008 by George

Physics
A proton is released from rest in a uniform electric field which is directed along the x axis and of magnitude E=2*10exponent5 V/m.The proton undergoes a displacement from point A at the origin to point B at x=0.2m.What is the change in the potential energy of the proton ...
January 17, 2011 by Joel

Physics
A 120 kg crate on the flatbed of a truck that is moving with an acceleration of 1.5 m/s^2 along the positive x axis. The crate does not slip with respect to the truck undergoes a displacement whose magnitude is 43 m. What is the total work done on the crate by all of the ...
March 18, 2015 by Amiel

AP Stats
Surveys indicate that 5% of the students who took the SATs had enrolled in an SAT prep course. 30% of the SAT prep students were admitted to their first choice college, as were 20% of the other students. You overhear a high school student say he got into the college he wanted...
January 2, 2009 by Stephanie

Physic
The spout heights in the container in the figure are 15 cm, 30 cm, 45 cm, and 60 cm. The water level is maintained at a 68 cm height by an outside supply. What is the speed of the water out of the 15 cm high hole? What is the speed of the water out of the 30 cm high hole? What...
May 7, 2011 by Bret

Chemistry
calculate the enthalpy change in delta H foor heating 250 grams of liquid water from 0 degrees celcius to 100 degrees celcius.
February 11, 2011 by Bri

writting a program
Speed of Sound. Sound travels through air as a result of collisions between the molecules in the air. The temperature of the air affects the speed of the molecules, which in turn affects the speed of sound. The velocity of sound in dry air can be approximated by the formula...
February 23, 2012 by sarah

general chemistry
. The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 °C is 410 s, what is the value of the rate constant k? If the initial concentration of dinitrogen pentoxide in an expt at ...
October 22, 2009 by susie

general chemistry
. The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 °C is 410 s, what is the value of the rate constant k? If the initial concentration of dinitrogen pentoxide in an expt at ...
October 22, 2009 by susie

chemistry
Acettlene gas (C2H2) is used in welding. During one job, a welder burns 48.0 g of acetylene. Using a balanced equation for the complete combustion of acetylene, calculate the following: Balanced Equation a) the mass of oxygen used b) the mass if carbon dioxide produced c) the ...
December 6, 2014 by Rose

English
Could you please check these sentences (the various alternatives). Thank you very much. 1) "I didn’t give him my password,” she said. 11) “Shall I wrap the chocolate for you?”, the shop assistant asked me. 2) She denied giving him her password. She admitted not giving him ... ...
October 5, 2011 by Henry2

chem-speed at STP
Hi- we were given this question and I have no clue how to figure it out...please help! Which gas molecules have the greatest average speed at STP? [a] SO2( sulfur dioxide) [b] NH3( ammonia) [c] O2( oxygen) [d] N20 (Dinitrogen oxide) Ok, at stp, that means they all have the ...
May 1, 2007 by ty

statistics
Statistics. The lowest temperature ever recorded in the state of Oregon was -54 F ( in Seneca, on February 10, 1933). The state’s record high temperature occurred in Pendleton on August 10, 1898, when it reached 119 F. What is the historical temperature range in the state of ...
March 21, 2007 by carol

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of a sun? A) Photosphere B) Chromosphere C) Corona D) Prominence 2. What materials could have been found in a giant cloud that formed the solar system? A- hydrogen and helium B- hydrogen and ...
February 13, 2015 by Katie

Physics
A raindrop (mass 1.00 g) is travelling at a speed of 40m/s when it hits the surface of 100 g of water contained in a drinking glass. What is the change in temperature of the water in the glass if we assume that a) all the kinetic energy of the raindrop is converted to energy ...
April 7, 2011 by Mark

accounting
E4-19 On December 31, the adjusted trial balance of Oslo Employment Agency shows the following selected data. Accounts Receivable $24,000 Commission Revenue $92,000 Interest Expense 7,800 Interest Payable 1,500 Analysis shows that adjusting entries were made to (1) accrue $4,...
January 26, 2012 by bill

  1. Pages:
  2. <<Prev
  3. 86
  4. 87
  5. 88
  6. 89
  7. 90
  8. 91
  9. 92
  10. 93
  11. 94
  12. 95
  13. 96
  14. 97
  15. 98
  16. 99
  17. 100
  18. Next>>

Members