Thursday
December 18, 2014

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

Number of results: 28,381

Chemistry
A copper coil is placed in a solution of silver nitrate, the reaction proceeds and in time silver crystals form and the colution of copper nitrate is produced. What is the complete raction .
June 6, 2011 by June

Chemistry
At a certain temperature, the pH of a neutral solution is 7.77. What is the value of Kw at that temperature?
November 22, 2010 by Pete

Chemistry
A student determined that ethanol was the best solvent to use for a recrystallization based on small scale trials. When the recrystallization was carried out on a larger scale, no crystals were obtained on cooling the hot solution. Why? and how would you overcome this problem???
January 24, 2009 by Matthew

Chemistry
Benzene sulfonic acid, C6H5SO3H, is a strong acid and will neutralise sodium hydroxide solution (a 1:1 molar ratio). Benzene sulfonic acid crystals (y grams) were weighed into a titration flask and titrated against sodium hydroxide solution (1.0 M) and needed a volume of 26.2 ...
June 15, 2014 by S

Chemistry
1. What happens to the temperature of water when 10J of energy are added if you have 10.00g of water? 2. What happens to the heat of the water if the temperature is cooled from 25.0 degrees celcius to 10.0 degrees celcius if you have 10.00g of water?
November 13, 2010 by jswass

college
In warm climates, drinking water is often cooled by evaporating water from the surfaces of clay pots or canvas bags. How many liters of water may be cooled from 37 C to 24 C by the evaporation of 100 g of water? The heat of vaporization of water is 2.4 kJ/g, and the specific...
October 28, 2010 by Abiola Ajibola

business question
What items appear on a merchandising company statements that don't appear on the service comapany statements? Is there really a difference on what that i cannot find it.
November 20, 2007 by student acc

Chemistry repost
A student determined that ethanol was the best solvent to use for a recrystallization based on small scale trials. When the recrystallization was carried out on a larger scale, no crystals were obtained on cooling the hot solution. Why? and how would you overcome this problem???
January 25, 2009 by Matt

chemistry
A saturated solution of potassium chlorate is formed from 100 grams of water. if the saturated solution is cooled from 80 degrees celsius to 50 degrees celsius, how many grams of precipate are formed? Do you have a table that lists the solubility at 80 and 50 degrees C?
January 10, 2007 by Alexus

geometry
100.0 g of copper(II) carbonate (molar mass = 123.56 g/mol) was heated until it decomposed completely. The gas was collected and cooled to room temperature and normal pressure (25C and 1.00 atm). What volume of carbon dioxide was produced? The reaction is: CuCO3(s) CuO(s...
December 8, 2010 by sassy

chemistry
Find for this reaction as written. (Use 1.0 for the density of the solution and 4.18 as the specific heat capacity.) When 0.129 of is combined with enough to make 53.8 of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from...
April 15, 2012 by dtost

Chemistry
Consider a 9% by mass aqueous ethyl alcohol solution. a.) Calculate the molality of this solution_____m b.) Given that ethyl alcohol is a molecular solute, calculate the freezing point of this solution. ________ degrees Celsius. c.) Consider the boiling point of each solution...
June 24, 2014 by amber

Calculus I
Suppose we have a metal bar of length L0 metres at temperature T0 in degrees Celsius.When the bar is heated or cooled, the length of the bar changes. The amount that the length changes is proportional to the product of the temperature change and the original length of the bar ...
September 16, 2014 by Anonymous

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

PHYSICS
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

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

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

chemisrty
Will 1,1,2, trichloro ethane rotate polarized light if it is cooled to low temperature and trapped in its lowest energy position? Yes, under all circumstances. Yes, but only if it is chiral. No, it will never rotate light. No, there is a racemic mixture present.
June 1, 2013 by Anonymous

Physics
Assume the optimal coffee drinking temperature is 75C, and further assume coffee has the same heat capacity and density as water. a. How much energy is required to raise the temperature of 1 cup (0.237 liters) of coffee initially at 25C to the optimal temperature? b. How ...
December 5, 2010 by Steve

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
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

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
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

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

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

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
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

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- 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
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
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
(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
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

Physics
You have a brass ring of inside diameter 10.00 cm that is at 20.0oC. You want to slip this ring over an aluminum rod that is at 20.0oC and has a diameter of 10.01 cm. a. To what temperature do you have to heat the ring to slip it over the rod? b. Once you have the ring over ...
December 4, 2014 by David

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

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

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
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

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

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

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

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
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.
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

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

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

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
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

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

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

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

Chemistry
After adding a hot piece of titanium to a cup containing 300.0 mL of 30.0 C water, the final temperature of the solution is 41.2 C and the final volume of the solution is 400.0 mL. The density of titanium is 4.50 g/cm3. If no energy is lost to the surroundings, what was the ...
December 11, 2014 by Laura

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

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

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

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

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

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

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

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
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
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
Suppose that 50.0 mL of a 0.250 M HCl solution is mixed with 50.0 mL of a 0.100 M Ba(OH)2 solution in a coffee-cup calorimeter. The temperature of the resulting solution increases by 1.76 oC . Calculate DH for the reaction between HCl (aq) and Ba(OH)2 (aq) in kJ per mole of Ba...
November 15, 2014 by Mahnoor

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

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

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

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

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

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

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

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

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

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

Calculus
Suppose that represents the temperature of a cup of coffee set out in a room, where T is expressed in degrees Fahrenheit and t in minutes. A physical principle known as Newtons Law of Cooling tells us that dT/dt = -1/15T+5 15T + 5. a) Supposes that T(0) = 105. What does the ...
November 30, 2014 by Bridget

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

Orgo Lab
Recrystallization is often used at the end of a synthesis. Choose the most accurate answer/s to explain the purpose of recrystallization and how it is done effectively? Note there may be more than one correct answer. 1.Dissolve the crude product in the minimum amount of cold ...
October 19, 2014 by Anonymous

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

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Search
Members