Saturday
October 22, 2016

# Search: Calculate the amount of heat required to completely sublime 85.0 of solid dry ice at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 .

Number of results: 63,569

chemistry
How much heat is required to vaporize 3.50L of at its normal boiling point? The following data are given for Carbon Tetrachloride. Normal melting point, -23 Degrees Celsius, normal boiling point, 77 Degrees Celsius; density of liquid, 1.59g/mL; Delta H (FUSION): 3.28 kJ mol^-1...
December 8, 2008 by Linda

chemistry
How much heat is required to vaporize 3.50L of at its normal boiling point? The following data are given for Carbon Tetrachloride. Normal melting point, -23 Degrees Celsius, normal boiling point, 77 Degrees Celsius; density of liquid, 1.59g/mL; Delta H (FUSION): 3.28 kJ mol^-1...
December 8, 2008 by Linda

physics
Why does water freezing not violate the second law of thermodynamics? (Hint: Think in terms of a system) The entropy of the water decreases when it freezes and goes into a more ordered crystaline state. However, heat is released to the environment in the process. If the ...
February 19, 2007 by anonymous

Chemistry
Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot. Could we write each...
November 8, 2015 by Justin

Chemistry
Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot. Could we write each...
November 8, 2015 by Justin

Chemistry
Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot. Could we write each...
November 8, 2015 by Justin

Chemistry
An experiment being conducted, the pressure is 0.9 atm and the temperature is 18 ° C. One of the steps of experience requires the combustion of 500 ml of ethanol (d = 0.78 g / ml). Whereas the burning this amount of ethanol does not significantly alter the enviroments ...
January 21, 2016 by Kennia

Chemistry
An experiment being conducted, the pressure is 0.9 atm and the temperature is 18 ° C. One of the steps of experience requires the combustion of 500 ml of ethanol (d = 0.78 g / ml). Whereas the burning this amount of ethanol does not significantly alter the enviroments ...
January 22, 2016 by Kennia

physics
An unknown material has a normal melting/freezing point of -20.4 °C, and the liquid phase has a specific heat capacity of 179 J/(kg C°). One-tenth of a kilogram of the solid at -20.4 °C is put into a 0.130-kg aluminum calorimeter cup that contains 0.198 kg of glycerin. The ...
December 4, 2013 by tiana

Chemistry
Carburization" of pure iron (Fe) is carried out at 950∘ C. It is desirable to achieve a carbon content of 0.9% at a depth of 0.1 mm below the surface. A constant supply of carbon at the surface maintains a surface concentration of 1.2%. Assuming the diffusivity of carbon...
December 6, 2012 by Andrea

chemistry
"Carburization" of pure iron (Fe) is carried out at 950∘ C. It is desirable to achieve a carbon content of 0.9% at a depth of 0.1 mm below the surface. A constant supply of carbon at the surface maintains a surface concentration of 1.2%. Assuming the diffusivity of ...
December 7, 2012 by lisa

IPC
The latent heat of vaporization of ethanol is 200 calories/gram. This means that _____. a) about 200 calories of heat must be added to 1 gram of ethanol to change its temperature b) about 200 calories of heat must be added to 1 gram of ethanol to convert it from a solid to a ...
October 26, 2010 by Jon

Chem
A chemical reaction in a bomb calormeter evolves 4.66Kj of heat. If the heat capcity of the calorimeter is 1.38 Kj/C what is the temperature change?
November 18, 2010 by Katie

Physics
A 10-kg piece of aluminum (which has a specific heat of 900 J/kg×°C) is warmed so that its temperature increases by 5.0 C°. How much heat was transferred into it?
December 19, 2010 by JJ

Integrated Physics and Chemistry
Insulating materials are rated by their.. A)specific heat B)heat index C)R-value D)temperature resistance
April 21, 2011 by Ashley!!

Chemistry
Consider the following reaction: 2Fe2O3 --> 4Fe + 3O2 ∆Hrxn° = +824.2 kJ The decomposition of 29.0 g of Fe2O3 results in a. the release of 150 kJ of heat b. the release of 12000 kJ of heat c. the absorption of 12000 kJ of heat d. the absorption of 150 kJ of heat e. ...
September 21, 2013 by Anonymous

ap chemistry
When 0.515 g of compound X is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0.243◦C is observed. What is Urxn for the combustion of compound X? The hardware component of the calorimeter has a heat capacity of 3.12kJ/◦C. ...
October 22, 2013 by gabriella

Chemistry
A piece of copper of mass 21.3 g at 106.0 °C is placed in a vessel of negligible heat capacity but containing 53.0 g of water at 19.3 °C. Calculate the final temperature of the water. I keep getting 22 celsius and I'm not sure where I'm going wrong. I plug it into the equation...
November 4, 2014 by Jessica

Heat and Molar Mass
An aqueous solution containing 34.6 g of an unknown molecular nonelectrolyte compound in 142.0 g of water was found to have a freezing point of 1.2 degrees C. Calculate the molar mass. A sample of steam with a mass of 0.553 g and at a temperature of 100 degrees C condenses ...
January 15, 2013 by Amy

chem question
This is on a practise exam I have and I cant get part of it, I don't know if it is not only due to my not understanding but to the fact that the first two parts might be wrong. Thanks for your help if you can. Heres the question: A coffee-cup calorimeter normally consists of ...
June 20, 2006 by Natalie

physics practical investigation
design and conduct an investion to find out whether the amount of heat(gas) produced will depend on an increase on the concentration of Hcl when Hcl reacts with an excess zn..guidance/hint...you may investigate either the amount of heat produced or the amount of gas produced(...
March 25, 2013 by Jossie

chemistry
if heat was added at a constant rate to the solid subsance, why did the temperature remain at 16 degree C for approximately 6 minutes?
October 4, 2010 by amanda

Chemistry
An insulated beaker contains 250g of water at 25 degrees celsius. Exactly 41.6g of a metal at 100 degrees celsius was dropped in the beaker. The final temperature of the water was 26.4 degrees celsius. Assuming that no heat is lost in any other way, calculate the specific heat...
January 22, 2012 by Hannah

phy
How much heat is required to raise the body temperature of a 60.0-kg woman from 37.0° C to 38.2° C?
April 17, 2013 by jessica

Chemistry
How many joules of heat are required to raise the temperature of 550 g of water from 12°C to 18°C
July 28, 2015 by Dilcia

chemistry
Islands in the middle of the oceans (for example, Great Britain, Hawaii, Bermuda) tend to have more stable climates with smaller temperature fluctuations than regions of the same mass surrounded by land (for example, continents). Use your knowledge of heat energy, specific ...

chem 101
This is second part is built off the first question. These are all from a practice test. How much heat is required to raise the temperature of exactly one liter of water fro m 60 °F to 180 °F? correct answer: 279kj How much alcohol must be burned to generate enough heat to ...
April 15, 2012 by Anonymous

Clark Atlanta
Plants need carbon dioxide to produce energy. How many carbon are there in 10.0 g of carbon dioxide? this is what I have so far. 10.0g x 1mol/44.01CO2 = 227 mol CO2
October 26, 2014 by Ashley

Chemistry
If 395 grams of water at 21 Celsius absorbs 285kJ of heat from a mountain climbers stove at an elevation where the boiling point of water is 87 Celsius, is this amount of energy sufficient to heat the water to its boiling point? How many kJ are required to boil the water?
November 6, 2011 by Kay

heat transfer
a plane wall of thickness 10 cm and thermal conductivity of 25w/m degree centigrade has a volumetric heat generation of.3*10 to the power 16w/mque .the wall is insulated on one side & other side is exposed to fluid at90 degree temperature . determine maximum temperature in ...
July 24, 2013 by sushil

Chemistry
A 19.3L expandible container is filled in a room where the pressure is 761mmHg. It is filled with 600.4mmHg nitrogen, 108mmHg oxygen, 32.1 mmHg water vapor. The rest of the pressure is made up by carbon dioxide. The temperature is 20.3°C a. What is the partial pressure of ...
September 26, 2016 by Anonymous

Chemistry
A 19.3L expandible container is filled in a room where the pressure is 761mmHg. It is filled with 600.4mmHg nitrogen, 108mmHg oxygen, 32.1 mmHg water vapor. The rest of the pressure is made up by carbon dioxide. The temperature is 20.3°C a. What is the partial pressure of ...
September 27, 2016 by Anonymous

physics
When a lead bullet hits a solid target at high speed, its entire kinetic energy is converted into heat. For simplicity, assume that all the heat is concentrated in the bullet rather than the target. If the bullet's initial temp. is 20` C, how fast should it be moving before ...
February 19, 2010 by elisabeth

chemistry
A propane barbeque is used to heat up 400g of water in an aluminum pot until it is boiling. Using the following information, calculate the molar enthalpy of propane. You can assume the temperature of the water and the temperature of the aluminum pot are always the same. ...
November 7, 2010 by Bob

Physical Science
How much heat is needed to melt a sample of ice if the temperature of 150 g of water in the calorimeter is lowered from 23.0 C to 0 C?
April 3, 2012 by Malise

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 25.8°C and the final temperature (after the solid dissolves) is 22....
March 30, 2013 by Philip Golden

chemistry
When 0.572 g of compound X is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0.461 ◦ C is observed. What is ∆Urxn for the combustion of compound X? The hardware component of the calorimeter has a heat capacity of 3.75 kJ...
October 2, 2012 by Austin

Chemistry
What quantity of heat is required to convert 200g of ice at 0.00C into water at 50C? I know that im suppose to use the E=mc(Delta T) but im not sure how...
July 17, 2014 by Alex

Chemistry
When 0.643 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 105C 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 ...
May 7, 2007 by Jared

science - chemistry
Some heat is supplied to a mixture of ice and liquid water in a closed container and the contents of the container are thoroughly mixed. If, after the addition of heat, both ice and liquid water remain: A) the temperature of the system will increase B) the vapor pressure will ...
December 27, 2010 by S

science HELP
the amount of heat gained or lost by a substance is equal to the product of its heat capacity times the change in temperaturetimes its _____________
April 22, 2008 by sam

Physics
Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
March 12, 2012 by Tracy

Chemistry
The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.
April 3, 2013 by B

Chem
The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.
April 4, 2013 by Joel

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

Chemistry Help!
calculate the specific heat of a metallic element if 314 joules of energy are needed to raise the teperature of a 50.0g sample from 25C to 50C. i'm not sure if you use the Q=(s)(m)(delta t) equation or not since it asks for the specific heat not the specific heat capacity.. i ...
June 6, 2010 by Ashley

Chemistry
When 5.00 g of NaOH(s) are added to 100 g of water using a calorimeter, the temperature rises from 25.0 to 37.5 °C. Calculate the molar heat of solution. NaOH(s)--->Na(aq)+OH(aq) Assume that the specific heat capacity of water is 4.18 J/gK and that of the NaOH(aq) solution ...

Chemistry
A 150.0-g sample of a metal at 69.7°C is added to 150.0 g of H2O at 10.5°C. The temperature of the water rises to 13.6°C. Calculate the specific heat capacity of the metal, assuming that all the heat lost by the metal is gained by the water.
September 26, 2015 by Anonymous

Science
Chemistry Enthalpy Calculations? Given the equation: CaO + H2O ----> Ca(OH)2 A 1 g sample of CaO is dissolved in 100 ml water with density 1.00g/ml. The temperature rise is 3.7 degrees C. The specific heat is 4.00 J/g*deg. 1. Calculate the heat (in J) absorbed/given off by ...
October 18, 2012 by Pablo

IPC(integrated phsyics)
Insulating materials are rated by their _____. specific heat heat index R-value temperature resistance
November 29, 2010 by lana

Chemistry
51J of heat added to an aluminum can with a mass of 25.5 g what is temperature change if specific heat capacity is 0.903 J/ g degrees Celsius?
January 29, 2016 by Anonymous

SMK Duma
how to calculate ? when 21g of magnesium carbonate was heated , magnesium oxide produced . carbon dioxide also released. what is the volume of carbon dioxide released ?
June 5, 2012 by Nurlisa

Molar heat of combustion question!
Calculate the molar heat of combustion of paraffin, expressed in units of kJ/mol. First calculate the thermal energy released when one mole of parafin burns) because one mole of parafin (c25h52) has a mass of 325g, the molar heat of combustion will be 352 times greater than ...
February 5, 2013 by Allyson

AP Chemistry
A typical bathtub can hold 93 gallons of water. Calculate the mass of natural gas that would need to be burned to heat the water for a tub of this size from 60◦F to 99◦F. Assume that the natural gas is pure methane(CH4) and that the products of combustion are ...
October 11, 2013 by Gabriella

Chemistry
Instant cold packs used to treat athletic injuries contain solid NH4NO3 and a pouch of water. When the pack is squeezed, the pouch breaks and the solid dissolves, lowering the temperature because of the following endothermic reaction. NH4NO3(s) + H2O(l) = NH4NO3(aq) ÄH = +25.7...
February 1, 2011 by Don

Chemistry
a. Exactly 4.000 mol of NH3 is burned in a constant volume (bomb) calorimeter immersed into 100.0kg of water. The temperature of water increases by 3.619 degrees C after the reaction. Calculate the heat released by the reaction. Neglect the heat capacity of the bomb and the ...
March 18, 2012 by Wendy

science
what physical property do all the following have in common:glass,water,carbon dioxide,plastic wrap,air? mass density, specific heat, thermal conductivity, X-ray absorption, and many others
December 30, 2006 by derick

chemistry
3.) A 5.00 x 10^2 g block of metal absorbs 5016 joules of heat when its temperature changed from 20 degrees C to 30 degrees C. Calculate the specific heat of the metal. I used the formula and came with two answers 100.32 joules and 10.01 joules. Which is correct?
February 9, 2008 by mhaidar9108

Chemistry
Substance A has a normal fusion point of ‑10.0 oC, an enthalpy of fusion = 150.0 J g^-1; specific heats for the solid and the liquid are 3.00 and 6.20 J g^-1 oC^-1, respectively. How much heat, in J, is required to change 150 grams of A from a solid at –40.0 oC to a ...
November 8, 2011 by Kale

chemistry
A sample of unknown metal has a mass of 36.7 g. This metal was placed in boiling water at 96.0oC until the metal had reached the temperature of the water. The metal was then placed in a foam cup with 50.0 g of water in it at 20.0oC. The cup absorbs 42.0 J/oC, and the ...
September 28, 2014 by korko

physic-heat
the specific heat of water is one of the highest of all substances.why does this make water a useful liquid to use in hot water bottles? and could you use a lump of nickel to warm your bed instead of a hot water bottle?which would be better? why? I will be happy to crititque ...
April 8, 2007 by Pauline

Chemistry
A 1.50 g sample of glucose (C6H12O6) is burned in a bomb calorimeter that contains water at 25.0 0C. The heat capacity of the bomb calorimeter is 1046 J/0C. When the glucose is combusted, the temperature of the water rises to 47.4 0C. Calculate the heat of combustion of ...
October 18, 2015 by Mark

physical science
hermal conductors don’t have to be hot to transfer heat. According to Ch.16, explain a situation when an ice cube would still transfer heat to another object it is in contact with.
October 21, 2015 by sidney

PHYSICS 102E
1. How much ice at -10 degrees Celsius is required to cool a mixture of 0.1 kg ethyl alcohol and 0.1 kg water from 20 degrees Celsius to 0 degrees Celsius? 2. Find the heat produced by 1 KW heating element in one hour. 3. A 3g lead bullet at 30 degrees Celsius is fired at a ...
December 14, 2008 by Akitsuke

chemistry
a carbon containing 3 atoms of carbon and 8 atoms of hydrdren combinend in reactionwith oxygen molecules the 2 end products of this equation are carbon dioxide co 2 an water what element should i look at first inn this oxygen hydrogen carbon or dioxide and wen finish balancing...
May 12, 2008 by andrea

Chemistry
On a warm summer day in Athens, the temperature is 33C (dry bulb temperature) and the relative humidity is 60%. What is the absolute humidity? (kg/kg Dry air) What is the humid volume of the air? (m^3 / kg Dry Air) What is the specific enthalpy of the air, taking H2O (L, 0C, ...
August 15, 2012 by Jacob

Chemistry Science
A piece of iron with a mass of 35 g is heated to 1305oC and then placed in a calorimeter containing 600 g of water. The temperature of the water increases from 25oc to 33oC. The specific heat of water is 4.184 J/g X C. Calculate the specific heat of the iron.
May 27, 2012 by vvfrn

science
. An ice cube of 48.7 grams is just beginning to melt. It is dropped into a swimming pool with a temperature of 26.0 ºC. How much heat will the ice cube absorb from the water in the swimming pool?
January 31, 2014 by chelsea wagner

physics
which is false? Consider the following processes: I. Energy flows as heat from a hot object to a colder object II. Work is done on a system and an equivalent amount of energy is rejected as heat by the system III. Energy is absorbed as heat by a system and an equivalent amount...
June 24, 2009 by matt

Chemistry
Temperature is a measure of the amount of heat an object contains. T/F
December 6, 2014 by Rachel

Integrated Physics and Chemistry
Matching... Heat engine Heat pump Boiler Thermostat -a heating appliance that uses heat energy released from fossil fuels to warm water for use in radiant or convection heating systems -a appliacne that controls the maintenance temperature of a heating system -an appliance ...
April 19, 2011 by Ashley

science
1) Science is the ______ of temperature 2) a ________ is used to measure temperature. 3) ice is ____ dense than water 4) adding heat to a ________ increases the the motion of molecules
May 1, 2011 by Crystal

Chem!??!?!?!?
Is it possible for a cup of water to completely evaporate in a room with a constant temperature of 21ºC??? Yes, of course. Why would you think it would not? A wet towel will dry, right? but why is that? The Kinetic Molecular Theory, distributed velocity /energy in molecules as...
January 22, 2007 by kyle

chemistry
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH_4NO_3(s) rightarrow NH_4...
December 19, 2012 by savannah

Chemistry
A hot lump of 25.6 g of aluminum at an initial temperature of 57.4 °C is placed in 50.0 mL of H2O initially at 25.0 °C and allowed to reach thermal equilibrium. What is the final temperature of the aluminum and water given that the specific heat of aluminum is 0.903 J/(g·°C)? ...
October 8, 2016 by Bart

Chemistry
A quantity of ice at 0.0 degrees C was added to 33.6 of water at 21.0 degree C to give water at 0.0 degrees C. How much ice was added? The heat of fusion of water is 6.01 kJ/mol and the specific heat is 4.18 J/(g * degrees C)
February 1, 2008 by Lauren

chemistry (combustion and heat)
How much heat is evolved when 5.00g of propane C3H8 burns completely. I got the formula down, now what? C3H8 + 5O2 -> 3CO2 + 4H2O
November 20, 2010 by Anonymous

physics
How much heat must be added to 0.55 kg of aluminum to change it from a solid at 180°C to a liquid at 660°C (its melting point)? The latent heat of fusion for aluminum is 4.0 105 J/kg.
December 10, 2010 by maria

chemistry
determine the quantity of heat needed to convert 17.0g of solid mercury at -50.0C to mercury vapor at 25C . Specific heats: , 24.3C , , 28.0C . Melting point of hg, -38.87C . Heat of fusion, 2.33 .
January 30, 2013 by Laura

ICP
The question is: A 30g sample of metal with a specific heat of .34J/g is heated to 50C. 4.8KJ of energy was transferred. What is the initial temperature? I used: heat=(mass)(specific heat)(change in temp) So I did 4800J=(30)(.34)(50-x) 4800=(10.2)(50-x) 4800=510-10.2x 4290=10....
March 1, 2010 by jp

chemistry
When 0.667 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 108C 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. what is the molar heat of reaction, H rxn, for the ...
February 17, 2010 by blasting

chemistry
An ice cube with a mass of 40.0 g melts in water originally at 25.0 degree C. a. How much heat does the ice cube absorb from the water when it melts. Report the answer in calories, kilocalories, joules b. Calculate the number of grams of water that can be cooled to 0 degreeC ...
April 27, 2010 by kim

Chem 101 calorimeter
Using the "Unit conversion method", derive an equation to calculate the heat required to raise the calorimeter (2 nested styrofoam cups) to the maximum temperature. PS don't say it makes no sense because its obviously a real question
October 26, 2011 by Guapo

Chemistry
which of the following substances (with specific heat provided) would show the greatest temperature change upon absorbing 100.0 J of heat?
April 5, 2010 by Bryson

Chemistry
which of the following substances (with specific heat provided) would show the greatest temperature change upon absorbing 100.0 J of heat?
April 5, 2010 by Bryson

Physics / Heat Transfer
How much heat must be removed from a 200 g block of copper to lower its temperature from 302 oF to 68 oF? Specific heat of copper: c = 0.092 kcal/(kg K) a. 2.4 kcal b. 2400 kcal c. 18.4 kcal d. 12 kcal e. 26 kcal
January 30, 2013 by John

Chemistry 111
The heat of fusion for a solid is .825kJ/mole. the formula weight of the solid is 150.24. How many grams of this solid can be melted by 305J of energy?
April 13, 2011 by Janna

physics
When a block of ice at zero degrees Celcius melts, the ice absorbs energy from its environment. As the ice is melting, the temperature of the block (remains the same, increase decrease) I think it remains the same. A sample of liquid ethyl alcohol is boiling. As more heat is ...
November 23, 2007 by Anonymous

chemistry
Tongue touches a pipe . Calculate final temperature of the tongue. 500 g of aluminum. ambient temp is -5 degrees Celsius. tongue is 100 g. heat capacity is same as pure water. assume heat capacity of aluminum is 24 J/molK.
February 1, 2009 by kat

Chemistry
Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ÄH = -81.5 kJ A 12.4 g sample of CaCl2 is dissolved in 100. g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the ...
November 13, 2011 by Bill

Chemistry
Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ÄH = -81.5 kJ A 10.4-g sample of CaCl2 is dissolved in 102 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the ...
April 18, 2013 by Mike

Science
Please check my answers (at the bottom) with these questions. 1. An apple quickly changes color when exposed to air. This demonstrates a ________. (1 point) physical property chemical property physical change all of the above 2. When a chunk of dry ice is at room temperature, ...
May 7, 2013 by Annabelle Hartz

science
i have to write a science acrostic poem on the word sublimation can any one help me with this please. thanks in advance.
October 8, 2008 by dgisselle

science
a car of mass 1360 kg descends from a hill of height 86 m at a constant speed of 20 km/h. assuming that all the potential/kinetic energy of the car goes into heat in the brakes, find the rise in temperature of the brakes (use the heat capacity (C) of the brakes to be 16kJ/C ...
April 26, 2008 by kelsee

physics practical investigation
design and conduct an investion to find out whether the amount of heat(gas) produced will depend on an increase on the concentration of Hcl when Hcl reacts with an excess zn..guidance/hint...you may investigate either the amount of heat produced or the amount of gas produced(...
March 25, 2013 by Jossie

Chemistry
How much heat is evolved in converting 1.00 mol of steam at 155.0 ∘C to ice at -45.0 ∘C? The heat capacity of steam is 2.01 J/(g⋅∘C) and of ice is 2.09 J/(g⋅∘C).
September 5, 2016 by Caleb

Physics
In cold climates, including the northern United States, a house can be built with very large windows facing south to take advantage of solar heating. Sunlight shining in during the daytime is absorbed by the floor, interior walls, and objects in the room, raising their ...
April 17, 2012 by Laketa

chemistry
Ethanol (C2H6O) is combusted with oxygen to produce carbon dioxide and wateraccording to the following reaction: C2H6O + 3O2 -----> 2H2O + 3CO2 If 50g of ethanol is combusted, determine the volume of carbon dioxide that will be produced if the temperature is 25oC and the ...
August 3, 2012 by Jennifer

Chemistry
A 25g piece of an unknown metal alloy at 150 degrees Celsius is dropped into an insulated container with 200 g of ice. Calculate the specific heat capacity of the metal, given that 9.0 g of ice melted. How would you work this out?
July 5, 2016 by Fred

science
Describe what happens at the particle level and what happens to a liquid's temperature when it reaches the liquid's heat of fusion. Is it possible for the ice in your freezer to be below 0 degrees celsius? explain. When does ice in your freezer reach equilibrium? I don't get ...
March 4, 2008 by astrid