Thursday
March 5, 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: 23,330

chemistry
The half-life for the first-order decomposition of is 1.3*10^-5. N2O4--> 2NO2 If N2O4 is introduced into an evacuated flask at a pressure of 17.0 mmHg , how many seconds are required for the pressure of NO2 to reach 1.4mmHg ? i know that the half life equation is t1/2= ln2/...
February 1, 2011 by Anonymous

Biology
1. Are the third-order heterotrophs consumed by gungal decomposers? My guess:Yes? 2. Which of the following fixes atmospheric N2 (nitrogen gas)? A. photosynthesis B. symbiotic bacterianon the roots of legumes C. uv light D. decay organisms E. autotrophs My guess: B? 3. Which ...
September 13, 2009 by Anonymous

chemistry
is there any way to know if its products or reactants..? The equilibrium constant for the gas phase reaction N2 (g) + 3H2 (g) (2 arrows: one to right, one to left.) 2NH3 (g) is Keq = 4.34 10^-3 at 300C. At equilibrium, __________. A) reactants predominate B) only reactants...
October 25, 2010 by Laynie

Chemistry
Please show work. 2Al(s) + 2NaOH(aq) + 6H2O(l) ---> 2NaAl(OH)4(aq) + 3H2(g) What mass of hydrogen gas would be formed from a reaction of 2.48 g Al and 4.76 g NaOH in water? Pb(NO3)2(s) + 2NaI(aq) ----> 2PbI2(s) +2NaNo3(aq) (a) If the solution contains 7.00 g NaI, what ...
February 25, 2013 by Anonymous

mat/116
need an expression only to this word problem: An experiment is underway to test the extreme effect of a newly developed liquid. Two hours into the experiment the temperature if the liquid measured to be -17 degrees Celsius. After eight hours of h experiment the temperature of ...
February 23, 2014 by csrla

chemistry
In which one of the following processes is ΔH = ΔE? a. 2HI(g) → H2(g) + I2(g) at atmospheric pressure. b. Two moles of ammonia gas are cooled from 325C to 300C at 1.2 atm. c. H2O(l) → H2O(g) at 100C at atmospheric pressure. d. CaCO3(s) → CaO(s...
August 15, 2009 by seth

chem - precipitation problems
When hydroge sulfide gas is passed through a solution of lead (II) nitrate, lead (II) sulfide precipitates out. Write a balanced equation for this reaction and calculate an average rate, in mol/s for the reaction from this data: 1) at 0 seconds, mass of lead (II) sulide is 0 g...
June 8, 2010 by Capella

Math
I am lost on this problem can someone help me with it? What is the major focal point of the story told by the information? Source of data: Ipsos-Public Affairs polls at least 966 people in each country September 17- October 2, 2005. Margin of error: positive or nrgative 3.1 to...
July 30, 2009 by B.B.

math
The temperature outside rose 41 degrees during a 12 hour period. If the temperature rose the same number of degrees every hour, what is a good estimate of the number of degrees the temperature rose each hour?
February 1, 2012 by peter

Grammar
Are these correctly punctuated? He admitted that he drank 10 beers a day. There is only one alternative to growing old; Dying young. Surgery will take place in 6 weeks, however, if his symptoms worsen, we will perform it sooner. Her tumor had metastasized rapidly; therefore, ...
October 21, 2009 by Jordyn

chemistry
Using the activity series, write a balanced chemical equation for the following reactions: 1. iron metal is added to a solution of copper (II) nitrate 2. zinc metal is added to a solution of magnesium sulfate 3. hydrobromic acid is added to tin metal 4. hydrogen gas is bubbled...
March 27, 2011 by Jessica

physics
A hot stell ball of mass 1 kg is dropped into a 4 L bucket of water at room temperature (70 degrees F). If the system reaches an equilibrium temperature of 320 K, what was the initial temperature of the steel ball before it was dropped into the water? Cp of steel = 490 J/kg ...
March 19, 2011 by Meghan

math
Calculate the answers |-3-|-7-7|| Does |n+m| = |n|+|m| for all integers na and m? If so, give some examples. If not, give a counterexample. The Weathertalk Analysis Problem. Read the following story about the TV weatherperson and identify as many places as possible that the ...
February 21, 2011 by bubba

chemistry
Here is the question: Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation: 2NaN3(s)-->2Na(s)+3N2(g) What mass (g) of NaN3 is required to provide 40.0 of N2 at 25.0 C and 763 torr? Here is my work: P=1.0039atm or 763torr V=40....
June 17, 2009 by Gweedo

Physics, help!
A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage) An ideal gas heat engine operates in a Carnot Cycle between temperatures of 266 and 115C. It absorbs 4250 cal per cycle at 266C. What is its ...
January 18, 2013 by Sierra

Math
On March 31, 2009, Wolfson Corporation acquired all of the outstanding common stock of barney Corporation for $17,000,000 in cash. The book values and fair values of barney's assets and liabilities were as follows: Book value Fair value current assets $6,000,000 7,500,000 ...
April 2, 2011 by Bobbi Loffredo

chemistry
In planning to administer a gaseous anesthetic to a patient, A) why mus the anthesiologist take into account the fact that during surgery the gaseous anesthetic is used both at room temperature (18C) and at the patients body temperature (37C)? B) What problems might arise if ...
March 22, 2008 by Jonathan T

Thermodynamics
A rigid insulated closed tank consists of two compartments of equal volume separated by a valve. Initially one contains air at 145 psia and temperature of 130 F, while second is completely empty(vaccum). the valve is opened and remains so until both are in pressure and ...
March 15, 2010 by spencer

physics
A 6.0 kg object undergoes an acceleration of 2.0 m/s2.a. What is the magnitude of the net force acting on the object?b. If this same force is applied to a 4.0 kg object, what acceleration isproduced?
December 3, 2009 by Melissa

science
Helium has the lowest boiling point of the elements. The slightest change in temp can cause it to vaporize and expand. To prevent pressure explosions, a line from the tank has a "burst disk" in case a of sudden pressure increse. then the diaphragm would rupture and release the...
January 2, 2011 by anonymous

physics
A solid aluminum sphere has a radius of 2.28 m and a temperature of 89.1 C. The sphere is then completely immersed in a pool of water whose temperature is 11.9 C. The sphere cools, while the water temperature remains nearly at 11.9 C, because the pool is very large. The ...
May 5, 2011 by shaknocka

physics
A solid aluminum sphere has a radius of 2.28 m and a temperature of 89.1 C. The sphere is then completely immersed in a pool of water whose temperature is 11.9 C. The sphere cools, while the water temperature remains nearly at 11.9 C, because the pool is very large. The ...
May 5, 2011 by shaknocka

math
11. Excluding Alaska, find the lowest temperature in the United States for the following date _________ (April 2nd) Express your answer in both Fahrenheit and Celsius. Also include the place where the temperature was recorded
May 11, 2009 by wishing i was good at math

Chemistry
A student in lab gathered temperature and concentration data for the solubility of borax and generated a plot of ln(Ksp) vs. 1/T having the equation of the line y = -11655x + 35.585. Determine the temperature (in units of K) at which the reaction becomes spontaneous.
April 11, 2013 by lisa

chem
Write the orbital notation for chromium. Type your answer using the noble gas abbreviation of the configuration and only the symbols in the table below. Enter the major energy levels with their sublevels in the order in which they are filled. Enter filled orbitals in a ...
May 2, 2013 by samantha

Dirt Bike
What does it mean for a dirt bike to be in neutral? Does it mean you can push it forward or can't push it forward? You can push it forward if it is in Neutral. It would move (especially downhill) without any gas. You can also run the engine without the bike moving as a result...
December 18, 2006 by ConFuzzled

Economic
Beth is single and lives in New York. Beth earned $280,000 in 2011. The following table shows the IRS tax rates for a single taxpayer in 2011 On Taxable Income .. Tax Rates up to $8,500 10% From $8,500 to $34,500 15% From $34,500 to $83,600 25% From $83,600 to $174,400 28% ...
November 8, 2014 by Anonymous

math
At a certain range of depths, the temperature of Earth's interior, in degrees Celsius, is expressed as 10d+20, where d is the depth in kilometres. Determine the temperature at a depth of 15km. I really don't get this, plz help!
September 22, 2008 by Caitlin

physic
Hi! help me please, Thank you. A spherical steel ball bearing has a diameter of 2.540 cm at 23C. (a) What is the diameter when its temperature is raised to 94C? cm (b) What temperature change is required to increase its volume by 0.9%? I only need help on part b.Thank
December 1, 2009 by Chan

Trigonometry/ Please Help
The average temperature, in F, of City B is given by the equation:y=19.5sin(pi/6t-2.06)+62 , where t is the time in months and t = 1 corresponds to January. What is the average temperature in April? Round your answer to the nearest hundredth.
January 13, 2011 by CJ

Chemistry
We apply the same amount of energy to 10.0-g samples of aluminum, and silver which begin at the same temperature.Rank the metals from highest to lowest temperature after the heat is applied.
May 10, 2012 by Chris

physics
An engine does 17700 J of work and rejects 6320 J of heat into a cold resevoir whose temperature is 283 K. What would be the smallest possible temperature of the hot resevoir?
November 6, 2012 by Anonymous

CHEMISTRY
A volume of 100ml of h20 is initially at room temperature (22.0c). A chilled steel rod at 2.00C is placed in the water. If the final temperature of the system is 21.2C , what is the mass of the steel bar?
November 28, 2012 by Anonymous

Chemistry
A sample of 40.0 mL of hydrogen is collected by water displacement at a temperature of 20 degrees Celcius. The barometer reads 751 torr. What is the volume of the hydrogen at STP (standard temperature and pressure)?
December 16, 2012 by Kia

Math/Physics
If 55034.175 kJ of heat are transferred to 150 kg of ice at a temperature of -12.15 degrees C, calculate the temperature of the resulting water. I know my formulas for sensible and latent heat but don't know how to approach this.
March 22, 2013 by Dylan

science
on a winter day the temperature drops from -15c too -25C overnight. if a pan sitting outside contains 0.50 kg of ice, how much heat is removed from the ice for the temperature change?
October 12, 2013 by Anonymous

chemistry
You need to prepare 500.00 mL of a 0.25 M solution of nitric acid . Concentrated nitric acid comes from the chemical copmanies as a 15.8 M liquid. How much (in mL) of this 15.8 M solution will you need to dilute to 500.00 mL to get the desired 0.25 M solution?
October 4, 2010 by j

chemistry
You need to prepare 500.00 mL of a 0.15 M solution of nitric acid . Concentrated nitric acid comes from the chemical copmanies as a 15.8 M liquid. How much (in mL) of this 15.8 M solution will you need to dilute to 500.00 mL to get the desired 0.15 M solution
October 10, 2010 by lulu

Earth Science
need help plzz .... I did some but I would like someone to double check them too 1. How did planetesmals form planets? (1 point) A. They broke apart into smaller chunks. B. They collided and stuck together. C. They cooled and pulled ice together. D. They began to rotate. 2. ...
November 8, 2013 by Mara

Chemistry
H2O (l) requires the largest amount of energy to raise the temperature of 25.0g H2O of the substance from 15.0 *C to 37.0 *C. Calculate the energy. Hg (l) has the largest temperature change when 550 g of the substance absorbs 10.7kJ of energy. Calculate the temperature change...
October 3, 2010 by Jack

Chemistry
When 0.655 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 107C 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 attention to significant figures. Do not ...
February 25, 2008 by Anonymous

physics
Point P is on the rim of a wheel of radius 2.0 m. At time t = 0, the wheel is at rest, and P is on the x axis. The wheel undergoes a uniform angular acceleration of 0.01 rad/s^2 about the center O. In Figure 9.1, the magnitude of the linear acceleration of P, when it reaches ...
November 16, 2012 by terry

chemistry
Stelco has been recently legislated to reduce total SO2 emissions from iron smelting operations. Select the most effective chemical reagent to desulfurize Stelcos gas emissions as a strategy to minimize the environmental impact of acid rain in eastern Canada: 1. NaCl 2. CO2 3...
November 8, 2009 by Danny

science
1. Use the diagram to answer question 1. description: particles have enough energy to break free from each other and can move around freely; particles spread out in different directions sketch: What kind of substance is described? (1point) solid liquid gas molecule 2. ...
March 31, 2014 by Kiera Lisople

chemistry
If 600 mL of 0.283 M aqueous NaBr and 15.9 L of gaseous Cl2 measured at STP are reacted stoichiometrically according to the balanced equation, how many liters of gaseous Cl2 measured at STP remain? Round your answer to 3 significant figures. 2NaBr(aq) + Cl2(g) 2NaCl(aq) + ...
June 6, 2010 by Judy

chem
Two gas tanks containing compounds A and B are connected by separate valves to two ends of a 10 meter glass tube as shown below. When both valves are thrown open at the same time A and B travel down the tubes towards each other. A white line appears when they meet and b has ...
December 5, 2011 by laura

HCl - Chem
Assume you had a very magnified view of a solution of HCl that allowed you to "see" the HCl. Draw this magnified view. If you dropped in a piece of magnesium, the magnesium would disappear and hydrogen gas would be released. Draw this out using symbols to represent the ...
January 13, 2007 by Gil

Alegbra
The rate at which water evaporates from a certain reservoir depends on the air temperature. The table below shows the number of acre-feet (af) of water per day that evaporate from the reservoir for various temperatures in degrees Fahrenheit. Temperature, F af 40 760 60 1600 ...
October 23, 2014 by Kim

Science/Math
If the temperature of a room is 70 degrees F, what is the temperature of the room in Celsius? In Kelvin?
September 6, 2010 by Kristina

Math
If the temperature fell 11 degrees from a low of 6 degrees, the temperature would now be??
November 11, 2014 by Margret

Physics
Knowing the temperature at the surface of the Earth to be 72 F, find the temperature at the surface of Venus.
December 10, 2014 by Sue

math
At noon the temperature was 2f.By sunset it had dropped 6 degrees. WHAT WAS THE TEMPERATURE AT SUNSET?
January 3, 2015 by liliana

Algebra
A can of soda is placed inside a cooler. As the soda cools, its temperature T(x) in degrees Celsius is given by the following exponential function, where is the number of minutes since the can was placed in the cooler. T(x)=-22+44e^-0.03x Find the initial temperature of the ...
June 15, 2011 by Jessica

Science
Heating Iron and Sulphure pruduces Iron Sulphide. What is the consitency/ appearance of Iron Sulphide ? Is it a powder or a solid?
September 23, 2009 by Carol

Chemistry(Please help)
For the reaction, 2 SO2(g) + O2(g) == 2 SO3(g), at 450.0 K (Kelvin) the equilibrium constant, Kc, has a value of 4.62. A system was charged to give these initial concentrations, (SO3) = 0.254 M and (O2) = 0.00855 M, and (SO2) = 0.500 M. In which direction will it go? I think I...
March 14, 2012 by Hannah

science
what is the kinetic energy, in J, of a)an Ar atom moving w/ a speed of 650m/s b)a mole of Ar atoms moving w/ a speed of 650m/s? a) K.E. = (1/2) M V^2 For M, use the mass of an Argon atom. It equals 0.040 kg (40 g) divided by Avogadro's number. M must be in kg to get the K.E. ...
January 8, 2007 by michelle

Science-Chemistry
I did a lab on Elements and Compounds and I would be grateful if u could provide and tell me some information on my work. Lab --Investigation--Elements and compounds. Can an element be seperated from a compound? Can an element form a compound? In this investigation, you will ...
September 13, 2010 by Immy

physics
In a house the temperature at the surface of a window is 20.1 C. The temperature outside at the window surface is 2.72 C. Heat is lost through the window via conduction, and the heat lost per second has a certain value. The temperature outside begins to fall, while the ...
November 17, 2014 by Anonymous

college math/chemistry
chemical reaction: E + S <=> E~S <=> E-S <=> indicates a bidirectional reaction with different forward and backward rate constants. we can call these k1, k2, k3 and k4 in the above equation. Here, the enzyme binds to the substrate; the initial complex E~S ...
December 9, 2010 by Heather

english
how to make this thesis on correct placement(Today the price of gasoline is at record high, which brings the question of whether or not the U.S. should start drilling more onshore or offshore. In order to bring now jobs on the market, and lessen the burden of high gas price on...
February 21, 2010 by ram

S103
Which element results if 2 protons and 2 neutrons are ejected from a radium nucleus with atomic number 88 and mass number 226 - show workings? What is actually ejected is an alpha particle (helium nucleus). The new atomic number is 88-2 = 86 and the new atomic weight is 226 - ...
March 7, 2007 by Pedro

physics
A 200 gram copper calorimeter contains 400 grams of water at 25 C. A metal specimen weighing 250 grams is heated to a certain temperature and the plunged into the calorimeter The final temperature of the mixture is 42C. If then specific heat of the metal specimen is 0.09 cal/(...
December 16, 2014 by wendell ryan

Chemistry
Consider the following equilibrium: H2CO3 (aq) ↔ H2O (l) + CO2 (g) Which direction will the equilibrium shift (left or right) if we: Increase the pressure by decreasing the volume of the system: Increase the pressure by adding Argon to the system: Addition of NaOH (aq) ...
February 19, 2013 by Anonymous

chemistry
Hi, please help me with this question If 600 mL of 0.283 M aqueous NaBr and 15.9 L of gaseous Cl2 measured at STP are reacted stoichiometrically according to the balanced equation, how many liters of gaseous Cl2 measured at STP remain? Round your answer to 3 significant ...
June 2, 2010 by Judy

Chemistry
A solution is made by dissolving 0.500 mol of HF in enough water to make 1.00 L of solution. At 21 C, the osmotic pressure of the solution is 1.35 atm. What is the percent ionization of this acid? This is what i did.. is it correct? (1.35 atm) = (2)(M)(0.08206)(294 K) M = 0....
February 19, 2012 by Eric

Math (:
The altitude of a triangle is increasing at a rate of 2.500 centimeters/minute while the area of the triangle is increasing at a rate of 1.500 square centimeters/minute. At what rate is the base of the triangle changing when the altitude is 10.500 centimeters and the area is ...
June 4, 2009 by <3

general chem
Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, simply write NR. (a) Nickel metal is added to a solution of copper (II) nitrate; (b) a solution of zinc nitrate is added to a solution of magnesium ...
October 9, 2011 by rob

Physics(check)
9)You are taking a road trip to the beach for Spring Break. You leave at 12:00pm. At 12:10 you stop for lunch 10 miles down the road. You get back on the road and travel 75 more miles and realize that you need to stop for gas. You notice that it is now 1:10pm. At this point in...
March 30, 2008 by Jon

Physics
When a mass is attached to a vertical spring, the spring is stretched a distance d. The mass is then pulled down from this position and released. It undergoes 53 oscillations in 30.6 s. What was the distance d? The answer is supposed to be 8.28 cm. How can I get this answer? ...
July 7, 2012 by James

Phy.
A proton of mass m moving with a speed of 2.5106 m/s undergoes a head-on elastic collision with an alpha particle of mass 4m, which is initially at rest. What is the speed of the proton after the collision?
May 8, 2011 by Brian

Chemistry
A piece of solid carbon dioxide, with a mass of 6.8 g, is placed in a 4.0-L otherwise empty container at 21C.
December 5, 2010 by Felicia

Chemistry
F2 (g) <--> 2 F (g) A 1.00 mol sample of F2 is placed in a 100. L container at 1000K. What is the pressure of the F2 before any decomposes?
February 17, 2011 by Michael

Chemistry
F2 (g) <--> 2 F (g) A 1.00 mol sample of F2 is placed in a 100. L container at 1000K. What is the pressure of the F2 before any decomposes?
February 17, 2011 by Michael

Chemistry
F2 (g) <--> 2 F (g) A 1.00 mol sample of F2 is placed in a 100. L container at 1000K. What is the pressure of the F2 before any decomposes?
February 17, 2011 by Michael

physics
a container has a height of 50 cm and a width of 20 cm and a depth of 15 cm. if you stack three on top of each other, how tall will it be?
September 8, 2011 by bfdbnaf

math
divide eight pounds of sand into twelve equal containers. how much in each container?
February 10, 2012 by chris

chemistry
calculate the pressure when 57 g of flourine at 55 degrees celsius is confined to a 152 liter container.
April 22, 2012 by brad

math
how many 2in by 5in by 3in boxes will fit in a 2ft by 4ft by 8ft container.
May 4, 2012 by shon

chemistry
calculate number of dichlorine molecules in a 5.00ml container at 40 degrees Celsius and a pressure of 2.14 x 10^4 Pa.
November 27, 2012 by matt

math (pre-calc)
Analyzing a Stock. The beta, B of a stock represents the relative risk of a stock compared with a market basket of stocks, such as Standard and poor's 500 Index of stocks. Beta is computed by finding the slope of the line of best fit between the rate of return of the stock and...
March 31, 2010 by Rony

Science 9
2.0kg block of iron transfers 180,000j to the atmosphere around it. If its initial temperature was 350 celius what is it's final temperature? If you know the specific heat of iron, you can use Q = mc(delta T).
December 30, 2006 by Ruby

Chem B
The air in a dry, sealed 2L soda bottle has a pressure of 0.998 atm at sea level at a temperature of 34C. what will be it's pressure, if it is brought to higher altitude where the temperature is only 23C?
April 5, 2010 by Courtney

chem
two metals both at a temperature of 25 degrees celsius are placed in seperate beakers. metal A has a larger specific heat than metal B. which beaker will exhibit a greater change in temperature
June 30, 2011 by lynn

Science
Question: The greatest expansion of water occurs when: isn't it when it turns to ice?? The other answers are at 4C it gains temperature or at 4C it loses temperature. In the winter the pipes can break because the water in them freezes thats why I thought it was that. Thanks
October 24, 2012 by MIKE

physics
A steel aircraft carrier is 361 m long when moving through the icy North Atlantic at a temperature of 1.7 C. By how much does the carrier lengthen when it is traveling in the warm Mediterranean Sea at a temperature of 16 C?
November 5, 2012 by Lucy

algebra
A can of soda at 79F is placed in a refrigerator that maintains a constant temperature of 36F. The temperature T of the soda t minutes after it is placed in the refrigerator is given by T(t) = 36 + 43e−0.058t. (a) Find the temperature, to the nearest degree, of the ...
September 18, 2014 by hule

Chemistry
When an excess of CaO is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 4.01C 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 attention to significant figures. Do not round ...
April 10, 2012 by Katherine

chemistry
2.9 The standard enthalpy of formation of the metallocene bis(benzene)chromium was measured in a calorimeter. It was found for the reaction Cr(C6H6)2(s) → Cr(s) + 2 C6H6(g) that . Find the corresponding reaction enthalpy and estimate the standard enthalpy of formation of...
June 18, 2011 by girlgirl

Solar Energy Please Help
a) Family Smith has already installed PV in their house. Now, they also want to cover their needs for warm water with solar energy. For this, they consider having a solar thermal water heating system. Considering that the need for warm water is 100L/day, the water has to be ...
October 26, 2013 by Anonymous

A&P II
1. Sandy, a 16-year-old woman, returns to the emergency room for the fifth time. She has been treated for Bulimia repeatedly. On initial assessment, you note shallow breathing. ARTERIAL BLOOD GASES are as follows: pH = 7.45 PaCO2 =47 mmHg HCO3- = 33 mEq/Liter My answer is ...
November 11, 2013 by Patricia

physics
A 550-g ball traveling at 8.0 m/s undergoes a head-on elastic collision with a 250-g ball traveling toward it also at 8.0 m/s. What is the speed of the 250-g mass after the collision?
October 28, 2010 by Alex

physics
A person's body is producing energy internally due to metabolic processes. If the body loses more energy than metabolic processes are generating, its temperature will drop. If the drop is severe, it can be life-threatening. Suppose a person is unclothed and energy is being ...
April 18, 2012 by anonymous

Chemistry
One proposed design for a Mars rover uses a methane gas fuel cell as its power supply. The methane fuel can be made on Mars using a chemical reaction that has been known for over 100-a the Sabatier methanation reaction: C02(g) + 4H2(g)<--> CH4(g) +2H2O(g) Enthalpy change...
November 28, 2010 by Mary

Biology (alert!)
Which sentence do you think does not agree with the true facts of coral reefs? 1. Off shore coral reefs are the cause of terrible storms in coastal communities. 2. Coral reefs form when the shells of thousands of corals join. 3. Sponges gives out chemicals that harden around ...
January 18, 2011 by eliana

English
Could you check the following sentences on indirect speech, too? Thank you. By the way, how do you pronounce "Keruac", the surname of the famous American writer? 1)He invited me to go for a walk. 2)One of the guests apologized for breaking the vase. 3)He suggested I should ...
October 4, 2011 by Henry2

math
Inflation is currently causing the cost of items to increase by about 2.5% per year. In 2009 a litre of gasoline costs approximately $0.90. What will it cost to fill a 60 litre gas tank 10 years from now. Round your answer to the nearest dollar. Name at least one thing other ...
April 2, 2013 by Daniel

math
Jack is swimming in the 500 meter race. It takes him 1minute and 35 seconds to swim one lap in an olympic sized pool (50 meters long - 25 meters wide.) How long will it take him to swim the 500 meter race
January 23, 2014 by Anonymous

physic
In a house the temperature at the surface of a window is 25 C. The temperature outside at the window surface is 5.0 C. Heat is lost through the window via conduction, and the heat lost per second has a certain value. The temperature outside begins to fall, while the ...
March 31, 2010 by firous

physics
a weather balloon carries instruments that measure temperature,pressure and humidity as it rises through the atmosphere.Suppose such a balloon has a volume of 1.2 m^3 at sea level where the pressure is 1 atm and the temperature is 20 degree Celsius.When the balloon is at an ...
November 1, 2011 by jennaq

Chemistry
106 g of iron at 84.0C are placed in contact with 205 g of silver at 11.0C. If no heat is lost to the surroundings, what is the final temperature of the metals? The specific heat of iron is 0.418 J/gC and that of silver is 0.251 J/gC. 92.0 g of a metal at 92.0C are ...
April 25, 2011 by Becky

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