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August 20, 2014

Search: the solution is cooled at what temperature will crystals appear

Number of results: 26,969

chemistry
A solution containing 80g of NaNO3 in 75g of H2O at 50 degrees celsius is cooled to 20 degrees celsius. A. how many grams of NaNO3 remain in solution at 20 degrees celsius? B. How many grams of solid in NaNO3 crystallized after cooling?
November 21, 2012 by Boo Boo

Earth Science
The (blank) of these common rocks grow large because of the (blank) rate of cooling. Wow thats vague, crystals, slow or fractures, rapid ??? hmmm Variences, differential??nah Pumice rocks greatly expand as they shoot out of the volcano. The (Crystals)of these common rocks grow...
October 25, 2006 by Barb

Chemistry
In the following experiment, a coffee-cup calorimeter containing 100. mL of H2O is used. The initial temperature of the calorimeter is 23.0 degrees C. If 3.80 g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The ...
June 21, 2012 by Abby

pressure
an ideal gas in a sealed container has an initial volume of 2.70L. at constant pressure, it is cooled to 25.00 C where its final volume is 1.75L. what was the initial temperature?
September 18, 2013 by Anonymous

chemistry
A saturated solution of NaCl (dissolved in water) has a concentration of 4.01 M at a given temperature. The solution has a volume of 1 L (1000 mL). If the water were to evaporate until the volume of the solution is 500 mL (and then stirred), what would the concentration of ...
February 14, 2013 by Avi

Science Help PLEASE!!
1. What happens to the levels of surface water and groundwater during a drought? Surface water and groundwater levels increase during drought. Surface water and groundwater levels decrease during drought. There is no change in the levels of surface water and groundwater during...
March 11, 2014 by Ally

Chemistry
If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, 1.)what is the balanced equation for this reaction? 2.) what is the ...
April 13, 2014 by Jennifer

chemistry
In the following experiment, a coffee-cup calorimeter containing 100 mL of H20 is used. The initial temperature of the calorimeter is 23.0 C . If 3.60 g of CaCl2is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of the ...
October 20, 2011 by Colin

Science Help PLEASE!! FAST
1. What happens to the levels of surface water and groundwater during a drought? Surface water and groundwater levels increase during drought. Surface water and groundwater levels decrease during drought. There is no change in the levels of surface water and groundwater during...
April 8, 2014 by Denna

Chemistry
Mass of an aspirin tablet is 0.42g and contains 77.38% ASA by mass. I dissolved the tablet in hot naOH and cooled the solution with distilled water to the mark of 250 volumetric flask. Then I pipetted 5.0 mL of the solution to the 100 mL volumetric flask and I diluted it with ...
April 25, 2007 by Brissa

Ms, Sue help me in science
1. As a sample of matter is cooled, which property of its particles increases? (1 point)average kinetic energy pressure buoyancy cohesive forces 2. Kinetic energy is the _____ of motion. (1 point)temperature energy heat state 3. Substances that have a low _____, such as most ...
April 10, 2012 by NIKE

chemistry
In a coffee-cup calorimeter, 1.91 g of NH4NO3 is mixed with 75.0 g of water at an initial temperature of 25.00oC. After the solution of the salt, the final temperature was 20.94oC. Assuming the solution has a heat capacity of 4.18 J/(goC) and assuming no heat loss to the ...
October 9, 2012 by Shawn

Chemistry
Iodine clock reaction If the thiosulfate ion solution was omitted what would appear in the solution? I know that once the thiosulfate ion is responsible and exhaubated the reaction rate stops and iodine is presented in the color blue. In that case, if thiosulfate ion solution ...
February 20, 2013 by Ahmad M

chemistry- Thank you
Suppose you add 81 ml of dilute acid to 54 ml of water. Both the water and acid were at room temperature (22 C) before being mixed. The temperature of the solution increased to 42 C. How much energy (in kJ) was released by the dissolution of the acid if the specific heat ...
October 17, 2010 by Jazmin

AP Chem
Helium gas, He, at 22 degrees C and 1.00 atm occupied a vessel whose volume was 2.54 L. What volume would this gas occupy if it were cooled to liquid-nitrogen temperature (-197 degrees celcius). What is the equation?
November 9, 2008 by Anna

Chemistry
A balloon originally has a volume of 4.39L at 44 C and a pressure of 729 torr. What temperature must the balloon be cooled to to reduce its volume to 3.78L at the same pressure? (A) 38 C (B) 72.9 C (C) 0 C (D) 546 C (E) 273 C Is the correct answer (A), 38 C?
January 1, 2010 by Anonymous

Chem 1010
What will happen to 42 g of KCl solution per 100 g of water when cooled from 60 degrees Celsius to 0 degrees Celsius?
November 21, 2010 by Jen

Chemistry ....help
If NaNO3 is cooled from 70C to 10C ; how much solid NaNO3 will come out of solution as a solid salt? Help me !!!
March 18, 2013 by Maria

CHEMISTRY/
A student takes a 1.00 mL aliquout of 5.00*10^-4 M HCl solution and dilutes it to the mark with water in a 1000.0 mL volumetric flask. (a)What is the expected pH for the final solution at 25C? (b)What would be the expected pH if this solution were later used at a temperature ...
March 20, 2011 by TORI

3 grade math
1- at 12 noon, leslie recorded the temperature as 56F. the temperature had increased by 8F from 10 A.M. the temperature at 8 A.M. was 2F warmer than it was at 10 A.M. what was the temperature at 8 A.M? MY Son write the answer is - 62F 2- the temperature at 6 P.M. was 72F. this...
February 29, 2012 by dk

physics
An aluminum saucepan with a diameter of 18 cm and a height of 6.0 cm is filled to the brim with water. The initial temperature of the pan and water is 19C. The pan is now placed in a refrigerator and cooled to 9C. Calculate the drop in water level in the pan.
November 17, 2009 by jawn

Chemistry
When an unknown substance weighing 2.386g is heated for 5 minutes and cooled to room temperature, it's new weight is 3.183g. No smoke rose for the sample while it was heated and it turned from white to a slight yellow. Were the students performing this experiment successful at...
January 23, 2011 by Mogran

Chemistry
Mercury, with a freezing point of -38.8C, is the only metal that is liquid at room temperature. How much heat energy (in joules) must be released by mercury if 1.30 mL of the metal is cooled from room temperature (18.0C) to -38.8C and then frozen to a solid? (The density of...
May 25, 2011 by Amalia

chemistry
How many milligrams of magnesium palmitate will precipitate from 965ml of this solution when it is cooled from 50C to 25C? For Mg(C16H21O2)2, Ksp= 4.8x10(-12) at 50C and 3.3x10(-12) at 25C.
October 17, 2011 by matt

Chemistry
(a) A 102-g sample of water is placed in an insulated container and allowed to come to room temperature at 21C. To heat the water sample to 41C, how much heat must you add to it? kJ (b) Consider the hypothetical reaction, being run in an insulated container that contains 102...
June 7, 2011 by Lance

CHM1045
NH4NO3(s) right arrow NH4+(aq) + NO3−(aq) In order to measure the enthalpy change for this reaction, 1.21 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8C and the final temperature (after the solid dissolves) is 22....
March 30, 2013 by Philip Golden

Chemistry
A saturated solution of potassium nitrate in water is prepared at 70.0*C then cooled to 55.0*C how many grams of potassium nitrate crystallized--- how do I determine this using my graph with everyone's numbers
May 8, 2013 by Melissa

science
1. As a sample of matter is cooled, which property of its particles increases? (1 point)average kinetic energy pressure buoyancy cohesive forces 2. Kinetic energy is the _____ of motion. (1 point)temperature energy heat state 3. Substances that have a low _____, such as most ...
April 10, 2012 by NIKE

science
which of the following is a physical change? Milk becomes sour An iron nails rusts All the water in a solution of salt water evaporates leaving a lot of crystals of salt in the bottom of the dish A wooden log is burned leaving ash in the fireplace
March 5, 2012 by Mary

science
when a reaction in solution produces energy, what happens to the temperature of the solution?
June 9, 2011 by harold

chemistry
the aqueous solution of copper sulphate & zinc sulphate appear how
January 22, 2013 by Anonymous

chemistry
A solution containing 80g of NaNO3 in 75g of H2O at 50 degrees celsius is cooled to 20 degrees celsius, how many grams of solid NaCO3 crystallized after cooling?
November 18, 2012 by Boo Boo

Physics
A thin brass ring of inner diameter 10cm at 20degrees C is warmed and slipped over an aluminum rod of diameter 10.01cm at 20degrees C. Assuming the average coefficient of linear expansions are constant, to what temperature must this combination be cooled to separate the parts?
April 15, 2009 by Sandhya

CHEMISTRY
The solubility of a substance is 12 g per 100 g water at 20 degree , and is 18 g per 100 g water at 60 degree , what is the mass of the substance can be crystallized in a saturated solution that contain 200 g of water , if the solution cooled from 60 to 20 degree ?
July 3, 2014 by MAD

Chemistry
A saturated solution at 25 C contains 10g of kclo3 in 50 ml of water. At what temperature does the solution become unsaturated?
February 13, 2012 by Mingma

science
A hollow cylinder of aluminium 1 m long with a 40 mm outside diameter is at a temperature of 20 C. What is the change in length and circumference of the cylinder when it is cooled to −25 C? (Note: the thermal co-efficient of expansion of aluminium is 24 10−6 K...
July 5, 2012 by emy

Chemistry
At 25 degrees Celsius all of these are true for a neutral solution : pH = 7.00, pOH = 7.00, and [H+] = [OH-] is that correct? For a neutral, aqueous solution regardless of temperature.. would the only correct statement be [H+] = [OH-]? pH = 7.00 and pOH = 7.00 would not be ...
April 16, 2012 by Katherine

chem.
A sample of argon at 300. C and 50.0 atm pressure is cooled in the same container to a temperature of 0. C. What is the new pressure? 105 atm 45.5 atm 54.9 atm 23.8 atm 42.7 atm
September 29, 2009 by Anonymous

Science (please help me)
I have 2 question on science 7. please help me. 1.state whether each substance is a mechanical mixture, a suspension, or a solution. My answers are at the bottom. a)green relish b)soda pop in a glass c)bubble tea d)traditional Aborigial paint made of red orchre and grease my ...
December 12, 2010 by Arushi

organic chemistry
How many milliliters of boiling water are required to dissolve 25 g of phthalic acid? If the solution were cooled to 14 degree Cellucius, how many grams of phthalic acid would recrystallize out?
September 2, 2012 by felici

Chemistry
A saturated solution of magnesium iodate has a temperature of 50C. it contains 175g of dissolved solute. What is the volume of the solution?
April 28, 2014 by Tyler

Chemistry
1. A chemist prepares a solution by dissolving 4.603 g of NaNO3 in enough water to make 200 mL of solution. What molar concentration of sodium nitrate should appear on the label? Answer in units of M 2.If the chemist mistakenly makes 225 mL of solution instead of the 200 mL, ...
March 19, 2014 by Bob Ewell

chem
Consider two identical iron nails: One nail is heated to 95 C, the other is cooled to 15 C. The two nails are placed in a coffee cup calorimeter and the system is allowed to come to thermal equilibrium. What is the final temperature of the two nails?
September 12, 2013 by mari

Chemistry
An empty flask weighs 128.632g. After vaporization of a sample of volatile liquid, at a measured temperature of 99.8 C. The flask is sealed, cooled to room temperature, and weighed. The mass is now 129.225g. The measured P atm is 757.7 torr. The flask is rinsed and filled ...
July 13, 2008 by Anonymous

Chemistry
An empty flask weighs 128.632g. After vaporization of a sample of volatile liquid, at a measured temperature of 99.8 C. The flask is sealed, cooled to room temperature, and weighed. The mass is now 129.225g. The measured P atm is 757.7 torr. The flask is rinsed and filled ...
April 6, 2011 by Shannon

Chem
I am doing a lab concerning pH... Why is it necessary to allow a mixture of 25mL of a 0.1M HCl solution with 20mL of a 0.08M NaOH solution to cool to room temperature? (I don't know if the actualy concentrations matter) Does it affect the pH? Yes, temperature affects the pH ...
March 7, 2007 by Marisol

Chemistry
2) To the solution in problem 1 (d) at 100 degrees celsius, 10g of water are added, and the solution is cooled to 0 degrees celsius... (problem 1d: the number of grams of water required to dissolve a mixture containing 15 g KNO3 and 3.5 g CuSO4 * 5 H20, assuming that the ...
September 18, 2012 by Sam

chemistry
a student determines the molar mass of methanol by the method used in this experiment. she found that the equilibrium temperature of a mixture of ice and pure water was .4 degrees Celsius on her thermometer. when she added 10g of her sample to the mixture, the temperature, ...
May 22, 2012 by liz

Heat Transfer
Air flows along a 1 m long plate. If the temperature of flow is 0 deg Celsius and the surface temperature of plate is maintained at 30 deg Celsius. Evaluate the heat flow from the plate to air. What are the maximum thickness of the velocity boundary layer and thermal boundary ...
March 5, 2012 by Farant

accounting
I am having trouble finding the following: What items appear on the merchandising company statements that dont appear on the service company statements? Why is there a difference? Please help.
January 15, 2008 by mh

chem/plz/check work studying for a final
23. A 32.3 L sample of a gas at 305oC and 1.20 atm is to be cooled at constant pressure until its volume becomes 28.4L. What will be the new gas temperature? Tf = Vf*Ti/Vi Tf =28.4L x (305+273)K / 32.3L = (28.4)(578)K / 32.3 = 16415.2/32.3 Tf = 508K I got this one wrong on a ...
December 16, 2010 by julia

Chemistry
when pure sodium hydroxide is dissolved in water , heat is evolved in a laboratory experiment measure a molar heat of solution of sodium hydroxide the following procedure was followed. to a calorimeter containing 300g of water at 20.0 C and 10.65g of NaOH also at 20.0 C was ...
March 23, 2007 by jim

Physics
a 500g piece of silver at 150 degrees celsuis is submerged in 1000g of water at 5 degrees celsuis to be cooled. determine the final temperature of the silver and water given. Cwater=4.18 x 10^3 J/kg.C Csilver = 2.4 x 10^2 J/kg.C
October 26, 2008 by Bobbie

Physical Science
How much heat is absorbed by pouring 10 grams of 100C liquid water on a students hand. The water is cooled to body temperature, 37C. Assume that all of the heat is absorbed by the hand
October 22, 2012 by Kayden

chemistry
What is the osmotic pressure in torr of a 0.0155 M glucose solution at body temperature ( 35.7 C)? What are the boiling and freezing points for the same solution?
April 22, 2013 by Ali

engineering
Mary Williams needs to change a Fahrenheit temperature to Celsius. Use the Fahrenheit temperature of 80 degrees to test your solution.
April 8, 2013 by Anonymous

Chemistry
A balloon originally has a volume of 4.39L at 44 C and a pressure of 729 torr. What temperature must the balloon be cooled to to reduce its volume to 3.78L at the same pressure? (A) 38 C (B) 72.9 C (C) 0 C (D) 546 C (E) 273 C Is the correct answer (E) 273 C?
January 3, 2010 by Anonymous

Physics Please Answer
1. to make a secure fit, rivets that are larger than the rivet hole are often used and the rivet is cooled (usually in dry ice) before it is placed in the hole. a steel rivet 1.871 cm in diameter is to be placed in a hole 1.869 cm in diameter at 20 degree celcius. to what ...
September 21, 2010 by JT

AP Chemistry
The Synthesis of an Iron Oxalato Complex Salt (Green Crystals) In this experiment you will synthesize a compound that will contain the elements potassium, iron, carbon, hydrogen, and oxygen. Carbon and oxygen will be present in the compound as oxalate (C2O4-2) whereas ...
October 17, 2012 by Colin

chemistry
How many grams of water can be cooled from 35^\circ {\rm C} to 16^\circ {\rm C} by the evaporation of 57{\rm g} of water? (The heat of vaporization of water in this temperature range is 2.4 {\rm kJ}/{\rm g}. The specific heat of water is 4.18 {\rm J}/{\rm g}\cdot {\rm K}.)
April 4, 2013 by Anonymous

Chemistry
Given: solubility (g/100g H2O) temp degrees celcius KBR 20 65 40 80 60 90 80 100 100 110 A solution containing 10.5g of KBr in 10g of H2O at 100 degrees celcius is cooled to 40 degrees celcius. A)calculate the g/100g H2O of KBr B)is the solution saturated at 100 degrees ...
May 11, 2011 by Curlyqty

chemistry
Investigating changes in colligative properties involves the measurement of a solutions concentration in molality instead of molarity because of which of the following? the mass of the solvent does not change, but its volume does change, as temperature changes. the volume of ...
March 28, 2011 by Annie

chemistry
An aspirin tablet weighing 0.548 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...
May 10, 2007 by jared

Chemistry
If you were to prepare a 1.00 molal solution of CaCl2 beginning with water at 27.0 C, what would the final temperature of the solution be (in C)? Assume that the specific heats of both pure H2O and the solution are the same, 4.18 J/K*g. The dissolution of CaCl2 in water is ...
April 18, 2011 by Bob

AP Chemistry
How can you find the average temperature of a refrigerator or any fridge by using colligative properties?? I am doing a lab in school and i'm not sure how to approach or start this. I know that you have to have two solutions where on one solution, you put a tremendous amount ...
December 30, 2012 by Sarah

sosial studies
When 1.0 L solution Ba (NO3) 2 2.0 M at 25oC is mixed with 1.0 L solution of 2.0 M Na2SO4 in a calorimeter, the reaction that occurs to produce solid barium sulfate and temperature of the mixture increased to 28.1 oC. Calculate the enthalpy change per mole for the reaction ...
November 20, 2013 by Norsiah

Chemistry 1
A dilute solution of hydrochloric acid with a mass of 614.86 g and containing 0.33004 mol of HCl was exactly neutralized in a calorimeter by the sodium hydroxide in 619.41 g of a comparably dilute solution. The temperature increased from 15.529 to 19.691C. The specific heat ...
July 1, 2014 by Sarah

physics
A 250g aluminum cup holds and is in thermal equilibrium with 850g of water at 83 degrees celcuis. The combination of cup and water is cooled uniformly so that the temperature decreases by 1.5 degrees celcuis per minute. At what rate is energy being removed?
September 2, 2011 by Marlee

physics
The label on a soft drink states that 15 fl. oz (444 g) provides 170 kcal. The drink is cooled to 11.0C before it is consumed. It then reaches body temperature of 37C. Find the net energy content of the drink. (Hint: You can treat the soft drink as being identical to water ...
July 26, 2012 by lanre

chemistry
If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, what is the balanced equation for this reaction?
March 26, 2012 by Tori

PLS HELP Financial
What items appear on the merchandising company statements that dont appear on the service company statements? Why is there a difference?
January 15, 2008 by Anonymous

Financial Accounting
What items appear on the merchandising company statements that dont appear on the service company statements? Why is there a difference?
March 24, 2009 by Anon

chem
Fluorine and krypton react to form binary compounds when a mixture of the two gases is heated to 500C in a nickel reaction vessel. A 100mL nickel container is filled with fluorin and krypton to partial pressures of 1.24 atm and 10.10 atm, respectively at a room temperature of ...
May 9, 2011 by Amy

Science
I have posted this question before and I have waited for 3 hours and no one is helping me. Please help me. I have 2 questions. 1.state whether each substance is a mechanical mixture, a suspension, or a solution. My answers are at the bottom. a)green relish b)soda pop in a ...
December 12, 2010 by Arushi

chem!
A common flaw in calorimetry experiments to determine the molar enthalpy of solution is to have a mass of solute that is inappropriate for the volume of water used resulting in a temperature change that is too small or too large. A temperature change of 5C to 10C is a good ...
April 14, 2007 by bob

chemistry
three student chemists measured 50.0 mL of 1.00 M NaOH in separate Styrofoam "coffee cup" calorimeters ( Part B). Brett added 50.0 mL of 1.10 M HCI to his solution of NaOH; Dale added 45.5 mL of 1.10 m HCL 9 eqaul moles) to his NaOH solution. Lyndsay added 50.0 mL of 1.00 m ...
January 17, 2011 by Daniel

chemistry
190 grams of potassium iodide is placed in 100 cm3 at 60 degrees Celsius. the solution is cooled to 30 degrees Celsius. how many grams will settle out?
September 19, 2013 by Cara

biology
Most automobiles have water-cooled engines. What must be true about a solution that can replace water in the cooling system, such as antifreeze? I know this is the second time I'm posting this question, but it's been hours and still no one's responding. Please help! Thanks! =)
September 12, 2009 by lamiya

Chem
Please help are these right? A 2.3 mole sample of nitrogen (N2), has a volume of 50.0 L and a pressure of 630 mmHg. What is the temperature of the gas? 41.5 C which I converted to Kelvin and got 231.5K Calculate the molarity (M) of the following solutions: A) 2.0 moles of ...
November 29, 2010 by Jada

Chemistry
A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 235 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction composition of the mixture?
February 11, 2013 by Emma

statistics
a batch of 25 used automobile alternators contains 3 defectives. if 3 alternators are sampled at random, find the probability of the event . (a). A=[none of the defectives appear ] (b). B=[exactly two defectives appear]
October 20, 2011 by marlynn

chemistry
NH4NO3(s) NH4+(aq) + NO3−(aq) In order to measure the enthalpy change for this reaction above, 1.07 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8C and the final temperature (after the solid dissolves) is 22.4C. ...
November 16, 2012 by DeeDee

Chemistry
How many grams of water can be cooled from 31 C to 20 C by the evaporation of 37 grams of water? (The heat of vaporization of water in this temperature range is 2.4 kJ/g. The specific heat of water is 4.18 J/g*K.
February 11, 2010 by Anonymous

chemistry
What mass of CaCl2(s) must be dissolved in pure water at 10 degrees celsius to make a 26.3 mL solution and to increase the solution temperature to 16.4 degrees celcius? assume solution has same physical properties as water. deltaH of solution = -82.8 kJ/mol specific heat of ...
November 17, 2008 by Anonymous

science
1. Which of the following is TRUE regarding this situation: Solution A has a pH of 7.38, and Solution B has a pH of 7.42? a.Solution B is more acidic than Solution A b.The pH of Solution A falls within the homeostatic pH range for extracellular body fluids, but the pH of ...
January 28, 2013 by a

CHM 152
At 20oC, a 2.32 M aqueous solution of Ammonium Chloride has a density of 1.0344g/ml. WHat is the molality of Ammonium Chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol?? I am not sure how to incorporate the density into the problem to come up with how to ...
June 10, 2010 by Car

Chemistry
When 100 mL of Ba(NO3)2 solution at 25 degrees Celsius is mixed with 100 mL solution CaSO4 solution at 25 degrees Celsius in calorimeter, the white solid BaSO4 forms and the temperature of the mixture increases to 28.1 degrees Celsius. Assuming that the calorimeter absorbs ...
December 9, 2012 by Megan

Accting
What items appear on the merchandising company statements that dont appear on the service company statements? Why is there a difference?
January 15, 2008 by Anonymous

chemistry
A 355g sample of a saturated solution of KNO3(s) in water is prepared at 25.0 degrees C. If 50g H2O is evaporated from the solution at the same time as the temperature is reduced from 25.0 to 0.0 degrees C, what mass of KNO3(s) will recrystallize? i have no idea where to start...
February 22, 2010 by david

Chemistry please check
1. An ionic compound solution is a(an)________ of electric current. non-conductor absorber emitter good conductor reverser ans: good conductor 2. Hydrogen bonding in water accounts for water's higher than expected boiling temperature the fact that ice floats in liquid water ...
February 24, 2008 by Mary

chemistry
Two liquids A and B on mixing form an ideal solution. The vapour pressure of the solution containing 2 moles of A and 4 moles of B is 0.2 atm. If the vapour pressure of pure A at a certain temperature is 0.3 atm then what will be the vapour pressure of pure B at that temperature?
May 28, 2013 by Adnan

science
What can happen to the reaction rate of a system that is heated and then cooled? Your question isn't quite clear; however, reaction rates increase, generally, with increase in T and decrease with decrease in T. Another way to interpret the problem is that an increase in T may...
April 16, 2007 by Shandra

Chemistry
when 5.0g of KOH is added to 100mL, of water, the temperature of the solution increases by 3 degrees celsius. Assume the density of the solution to be 1g/mL and specific heat capacity of the solution to be 4.184 J/g K. a. calculate the amount of heat absorbed by the solution. ...
March 27, 2012 by danielle

Chemistry
The freezing point of mercury is -38.8C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0C to -38.8C and then frozen to a solid? (The density of liquid ...
April 22, 2011 by Lindy

Chemistry
The freezing point of mercury is -38.8C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0C to -38.8C and then frozen to a solid? (The density of liquid ...
April 23, 2011 by Lindy

chemistry
The freezing point of mercury is -38.8C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0C to -38.8C and then frozen to a solid? (The density of liquid ...
April 23, 2011 by Lindy

chemistry
a kilogram of aluminum metal and a kilogram of water are each warmed to 75 degree celisus and placed in two identical insulated containers. one hour later, the two containers are opened and the temperture of each substance is measured. the aluminum has cooled to 35 degree ...
January 17, 2011 by Sammy

chemistry help
a kilogram of aluminum metal and a kilogram of water are each warmed to 75 degree celisus and placed in two identical insulated containers. one hour later, the two containers are opened and the temperture of each substance is measured. the aluminum has cooled to 35 degree ...
January 17, 2011 by Sammy

chemistry help
a kilogram of aluminum metal and a kilogram of water are each warmed to 75 degree celisus and placed in two identical insulated containers. one hour later, the two containers are opened and the temperture of each substance is measured. the aluminum has cooled to 35 degree ...
January 17, 2011 by Sammy

chemisrty
A 50.0 mL solution of 1.2 M HCl at 24.1C is mixed with 50.0 mL of 1.3 M NaOH, also at 24.1C, in a coffee-cup calorimeter. After the reaction occurs, the temperature of the resulting mixture is 29.8C. The density of the final solution is 1.05 g/mL. Calculate the molar heat of ...
June 18, 2014 by jesse

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