Thursday

January 29, 2015

January 29, 2015

Number of results: 37,308

**Chemistry**

Lead has a melting point of 327C, its specific heat is J/gdeg, and its molar enthalpy of fusion is 4.80 kJ/mol. How much heat, in kilojoules, will be required to heat a 500.0-g sample of lead from 23.0C to its melting point and then melt it?
*November 4, 2012 by steph*

**Chemistry**

Lead has a melting point of 327C, its specific heat is J/gdeg, and its molar enthalpy of fusion is 4.80 kJ/mol. How much heat, in kilojoules, will be required to heat a 500.0-g sample of lead from 23.0C to its melting point and then melt it?
*November 4, 2012 by steph*

**Physics**

How much energy is needed to melt 0.225 kg of lead so that it can be used to make a lead sinker for fishing? The sample has an initial temperature of 27.3 degrees celsius and is poured in the mold immediately after it has melted. Not sure if this is relevant to finding the ...
*March 30, 2010 by Kim*

**Physics**

How much energy is needed to melt 0.225 kg of lead so that it can be used to make a lead sinker for fishing? The sample has an initial temperature of 27.3 degrees celsius and is poured in the mold immediately after it has melted. Not sure if this is relevant to finding the ...
*March 30, 2010 by Kim*

**College Physics**

100 grams of molten lead (600oC) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21oC), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/g oC; the latent heat of fusion and the...
*June 12, 2011 by Chris*

**physics**

If 50,000joules of heat is added to 10kg of lead at its melting point of 330 degrees celsius.If 2kg of lead melts,calculate the latent heat of fusion of lead
*January 12, 2012 by chrystabelle1*

**Physics**

. How much heat does it take to melt 2.5 kg of lead when it is at its melting point (m.p. = 327.5C; Hf = 2.04 104 J/kg)? 6.2 101 J 8.2 103 J 5.1 104 J 1.7 107 J
*May 7, 2014 by PeterPiperPAPP*

**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*

**physics**

lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 250.0 kg sample of lead with a temperature of 20.0 degrees Celsius? q1 = heat to move ...
*November 21, 2006 by Erica*

**Science**

I'm going crazy! The heat necessary to change the state of water between a solid and a liquid is called the latent heat of vaporization, latent heat of solidification, latent heat of fusion, latent heat of liquefaction, or none of the above. I thought it was none of the above...
*December 8, 2006 by Pat*

**SCIENCE QUESTION**

LEAD IS A SOFT, DENSE METAL WITH A SPECIFIC HEAT OF 0.028KCAL/KGC, A MELTING POINT OF 328.0C, AND A HEAT FUSION OF5.5KCAL/KG. HOW MUCH HEAT MUST BE PROVIDED TO MELT A 250.0KG SAMPLE OF LEAD WITH A TEMPERATURE OF 20.0C? Figure the heat to heat if from 20C to the melting point (...
*October 7, 2006 by priscilla*

**physics**

What mass (in grams) of steam at 100C must be mixed with 341 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 57.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
*April 15, 2011 by tim*

**physics**

What mass (in grams) of steam at 100C must be mixed with 446 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 65.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
*April 1, 2013 by safc*

**thermal physics**

What mass (in grams) of steam at 100C must be mixed with 340 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 12.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
*March 23, 2009 by chirayu*

**thermal physics**

What mass (in grams) of steam at 100C must be mixed with 340 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 12.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
*March 25, 2009 by chirayu*

**HELP URGENT Phyiics**

What mass (in grams) of steam at 100C must be mixed with 446 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 65.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
*April 12, 2013 by HELP*

**physical mod**

What mass (in grams) of steam at 100C must be mixed with 462 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 40.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
*September 13, 2013 by adrian*

**physics**

Objects A and B have the same mass of 3.4 kg and are at their melting points. They melt when 4.9 104 J of heat is added to A and when 11 104 J is added to B. (a), (b) Determine the latent heat of fusion for the substance from which each object is made. (c) Find the heat ...
*April 24, 2013 by Anonymous*

**physics**

How much heat must be added to 0.55 kg of aluminum to change it from a solid at 180C to a liquid at 660C (its melting point)? The latent heat of fusion for aluminum is 4.0x10^5 J/kg. I understand the Equation Q=mc times change it T would that be .55 times 4.0 x 10^5 times (...
*December 10, 2010 by maria*

**physics**

If a lead bullet goes fast enough, it can melt completely when it comes to a halt suddenly, and all it's kinetic energy is converted into heat via friction. Find the minimum speed of a lead bullet (initial temp. = 30.0 C) needed for this to happen. So I related that Q = KE ...
*April 15, 2012 by Daniel*

**physics**

The latent heat of fusion for water is 33.5 104 J/kg, while the latent heat of vaporization is 22.6 105 J/kg. What mass m of water at 0 C must be frozen in order to release the amount of heat that 2.32 kg of steam at 100 C releases when it condenses?
*July 30, 2013 by damon*

**Chemisty**

LEAD IS A SOFT, DENSE METAL WITH A SPECIFIC HEAT OF 0.028KCAL/KGC, A MELTING POINT OF 328.0C, AND A HEAT FUSION OF5.5KCAL/KG. HOW MUCH HEAT MUST BE PROVIDED TO MELT A 250.0KG SAMPLE OF LEAD WITH A TEMPERATURE OF 20.0C?
*October 23, 2008 by Jessica*

**Physical Science**

Lead is a soft, dense metal with a specific heat of 0.117 J/goC, a melting point of 328.0 oC, and a heat of fusion of 23012 J/g. How much heat (in kilojoules) must be provided to melt a 350.0 kg sample of lead that is initially at 20 oC?
*October 27, 2014 by Ashley*

**physical science**

Lead is a soft, dense metal with a specific heat of 0.028 kcal/kgC, a melting point of 328.0C, and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 202.2 kg sample of lead with a temperature of 20.0C?
*October 12, 2010 by Anonymous*

**Physical Science**

lead has specific heat of .028kcal/kgC, melting point of 328 degrees C and a heat fusion of 5.5 kcal/kg. how much heat must be provided to melt a 250kg sample of lead with a temperature of 20 degrees Celsius?
*April 8, 2011 by yolanda*

**physics**

Entropy of melting A block of a certain substance (m = 0.3 kg) sits in a cold room at its melting point 170 K. A lab demonstrator supplies heat at a rate of 200 W for 140 seconds by focusing light on the block to (just) completely melt the block. (a) What is the latent heat of...
*March 27, 2010 by michael*

**physics**

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

**Physics**

You have a 2.00 kg block of lead. Lead melts at 327.5°C. CPb = 130.0 , and Hf for lead is 2.04 × 104 J/kg. Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?
*March 18, 2012 by Pat*

**physics**

How much heat in joules must be added to 0.348 kg of aluminum to change it from a solid at 138 C to a liquid at 660 C (its melting point)? The latent heat of fusion for aluminum is 4.0 x 105 J/kg.
*May 15, 2012 by RM*

**Physics**

The latent heat of fusion of alcohol is 50 kcal/kg and its melting point is -54oC. It has a specific heat of 0.60 in its liquid state. Calculate the energy needed to melt 2.0 kg of solid alcohol at -54o and raise it to a temperature of -4C.
*June 18, 2013 by Isis*

**physics**

It has been said that sometimes lead bullets melt upon impact. Assume that a bullet with an initial temperature of 301 K receives 73.9 % of the work done on it by a wall on impact as an increase in internal energy. (The melting point of lead is 601 K, the heat of fusion for ...
*November 5, 2014 by Anonymous*

**physics**

It has been said that sometimes lead bullets melt upon impact. Assume that a bullet with an initial temperature of 295 K receives 73.5 % of the work done on it by a wall on impact as an increase in internal energy. (The melting point of lead is 601 K, the heat of fusion for ...
*November 12, 2014 by Anonymous*

**Physics**

It takes 1110 calories of energy to melt a 185 gram lump of lead. What is lead's latent heat of fusion?
*March 5, 2012 by Tracy*

**Astronomy**

The latent heat of melting is the amount of energy needed to convert a solid substance at its melting temper- ature to a liquid at the same temperature. For typical volcanic rocks, the latent heat of melting is around 5105 J/kg, which means it takes 5105 J to turn 1 kg of ...
*April 9, 2009 by Ashley*

**physics**

It has been said that sometimes lead bullets melt upon impact. Assume that a bullet with an initial temperature of 301 K receives 67.9 % of the work done on it by a wall on impact as an increase in internal energy. (The melting point of lead is 601 K, the heat of fusion for ...
*November 18, 2014 by mehmet kaya*

**Science**

The latent heat of fusion for metal is 246kj per kg. How much heat would be used by melting 10 tonnes of metal?
*November 7, 2014 by Aliya*

**physics**

The latent heat of fusion for metal is 246kj per kg. How much heat would be used by melting 10 tonnes of metal?
*November 9, 2014 by Aliya*

**chemisty**

calculate the heat energy released when 25.8 g of liquid mercury at 25 C is converted to solid mercury at its melting point. Constants for mercury at 1 atm: heat capacity of Hg-->28.0 melting point-->234.32 K enthalpy of fusion-->2.29 kj/mol
*June 27, 2013 by Jill*

**Phase Changes**

The heat of fusion of water is 335 J/g, the heat of vaporization of water is 2.26 kJ/g, the specifc heat of ice is 2.05 J/deg/g, the specific heat of steam is 2.08 J/deg/g and the specific heat of liquid water is 4.184 J/deg/g. How much heat would be needed to convert 10.73 g ...
*May 8, 2013 by Jenny*

**physics**

At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. The thickness of the cup is 2.0*10^-3m, and the area is 0.016 m^2. The temperature at the outside surface of the cup is 35 degree C. The latent heat of fusion for ice is 3.35*10^5 J/kg. What mass of ice ...
*February 21, 2008 by Lydia*

**physics**

A 40kg box of sweet cherries at 10 c cosisting of 30kg water and 10kg cherries is to be frozen at -30c.Calculate the total amount of heat that needsto be removed from the cherries . The specific heat capacity of cherries is 3.43kj /kgc. The specific ccapacity of water is ...
*November 9, 2014 by Aliya*

**physics**

A 40kg box of sweet cherries at 10 c cosisting of 30kg water and 10kg cherries is to be frozen at -30c.Calculate the total amount of heat that needsto be removed from the cherries . The specific heat capacity of cherries is 3.43kj /kgc. The specific ccapacity of water is 4...
*November 9, 2014 by please help!!!*

**Physics Please check my answers**

1. An amusement park ride has a diameter of 16 meters and revolves at 15 rpm (revolutions per minute). How fast is a rider moving if she sits at the outermost part of the ride? A. 29.4 m/s B. 1.07 m/s <<<< C. 225 m/s D. 12.56 m/s E. 9.8 m/s 2. A police officer ...
*January 17, 2014 by Rachell*

**chemistry**

the heat of fusion water is335 J/g. The heat of evaporization of water is 2.26 kJ/g, the specific heat of ice is 2.05 J/Deg/g, the specific heat of steam is 2.08 J/deg/g and the specific heat of liquid water is 4.184 J/deg/g. How much heat would be needed to convert 12.09 g of...
*April 24, 2012 by Randy*

**Physics: Capacitance of Capacitor**

Capacitor A and capacitor B both have the same voltage across their plates. However, the energy of capacitor A can melt m kilograms of ice at 0 C, while the energy of capacitor B can boil away the same amount of water at 100 C. The capacitance of capacitor A is 8.4 μF. ...
*May 10, 2013 by Phil-- HELP NEEDED ASAP*

**physics**

How much heat must be removed from 456 g of water at 25.0C to change it into ice at -10.0C? The specific heat of ice is 2090 J/kg ∙ K, the latent heat of fusion of water is 33.5 104 J/kg, and the specific heat of water is 4186 J/kg ∙ K.
*January 25, 2015 by ej*

**physcial science**

When 1 kg of ice at 0 degrees Celsius absorbs 80 kilocalories of heat, the ice undergoes a) a change of state b) a loss of energy c) a rise in temperature d) an increase in volulme The heat of fusion of water is 80 kcal/kg. That means that 1 kg of ice will melt if it absorbs ...
*June 22, 2007 by daniel*

**Physical Science**

A 5.00 kg block of ice at 25 oC is converted to steam at 125 oC. How much energy (in kilojoules) is expended in this process? The following data are provided: a. Specific heat of ice = 2.092 J/g oC b. Latent heat of fusion = 334.72 J/g c. Specific heat of water = 4.184 J/g oC...
*October 27, 2014 by Ashley*

**Physics**

What is latent heat of vaporisation and latent heat of fusion?
*June 5, 2011 by Shruthi*

**Chemistry**

The specific heat capacity of solid lead is 0.159J/gC, the molar enthalpy of fusion is 5.0kJ/mol, and the melting point of lead is 328C. Calculate the total energy required to change 100g of lead at 25C to molten lead at it's melting point. I will be happy to critique your ...
*September 23, 2006 by J.M.*

**chem**

im working on a lab in chemistry called measuring energy changes :Calorimetry how to you determine the molar latent heat of fusion of ice using q=mcT ?? why was the ice driedbefore it was placed in water? why is hot warer ysed rather than room temp? in which dirextion would ...
*February 11, 2010 by jess*

**Chemistry**

DrBob222, HELP! Calculate the heat energy released when 29.7 g of liquid mercury at 25.00 C is converted to solid mercury at its melting point. Constants for mercury at 1 atm: Heat capacity of Hg (l) 28.0 J/Mol*K, Melting pt 234.32 k, and enthalpy of fusion 2.29 kg/mol
*September 11, 2012 by Jordan*

**CHEM HELP ASAP!**

Calculate the heat energy released when 29.7 g of liquid mercury at 25.00 C is converted to solid mercury at its melting point. Constants for mercury at 1 atm: Heat capacity of Hg (l) 28.0 J/Mol*K, Melting pt 234.32 k, and enthalpy of fusion 2.29 kg/mol
*September 11, 2012 by Jordan*

**Physics**

5) An insulated Thermos contains 190 cm3 of hot coffee at 79.0C. You put in a 11.0 g ice cube at its melting point to cool the coffee. By how many degrees (in Celsius) has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it ...
*November 14, 2010 by john*

**physics**

An insulated Thermos contains 140 cm3 of hot coffee at 89.0C. You put in a 11.0 g ice cube at its melting point to cool the coffee. By how many degrees (in Celsius) has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were ...
*December 4, 2011 by mar13*

**physics**

An insulated Thermos contains 140 cm3 of hot coffee at 89.0C. You put in a 11.0 g ice cube at its melting point to cool the coffee. By how many degrees (in Celsius) has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were ...
*December 4, 2011 by mar13*

**Chemistry **

A substance has the following properties: Heat capacities: 1.34 J/g oC (solid) 3.02 J/g oC (liquid) 2.55 J/g oC (gas) Heat of Fusion = 4.23 kJ/mole Heat of Vaporization = 23.5 kJ/mole Boiling Point = 88.5 oC Melting Point = -30.0 oC Molar Mass = 96.3 g/mole How much energy (in...
*November 25, 2014 by Amanda*

**science**

When you freeze water, 80 calories of heat are released into the surroundings for every gram of water that freezes. This is known as the "latent heat of fusion" of water, which is 80 cal/g. Heat of fusion is a characteristic property. Theoretically, if you could "capture" all ...
*January 31, 2011 by Elizabeth*

**chem**

The normal melting point of copper is 1357 K and heat of fusion of Cu is 13.05 KJ. How much heat, in kilojoules, is evolved when a 3.70 kg sample of of molten Cu freezes?
*February 11, 2010 by Joseph*

**Chemistry**

The standard molar heat of fusion of ice is 6020 J/mol. Calculate q, w, and (delta) E for melting 1.00 mol of ice at 0 deg. C and 1.00 atm pressure.
*April 11, 2012 by AChem*

**Physics**

Help me understand this please You have a 2.00 kg block of lead. Lead melts at 327.5C. CPb = 130.0 , and Hf for lead is 2.04 10^4 J/kg. Say you start at room temperature (25.0C). How much heat must you transfer to melt all the lead?
*March 25, 2014 by Me and I*

**chemistry**

HELPPPP!!!! This is a lab, and i need help with the equations please!! Thank you !! Heat of fusion data table : Mass of foam cup = 3.57g Mass of foam cup + warm water = 104.58g Mass of foam cup + warm water + melted ice = 129.1g Temperature of warm water = 37 degrees celcius. ...
*December 2, 2012 by maryam*

**Chemistry**

Search: How much energy (in Kj) is relased when 25.0g of ethanol vapor at 93, is cooled to -10? Ethanol has a melting point of -114.5, bp of 78.4, specific heat= 2.10J/g, heat of fusion =4.60Kj/mol, specicic heat= 1.9j/g, heat of vaporization = 38.56Kj/mol
*September 27, 2011 by Oscar*

** matter and energy**

how much heat must be added to 5.0 g of solid lead at 30 degrees celcius to convert it to liquid lead at the melting point?
*October 1, 2014 by fred*

**Nsuk**

(1)calculate the heat energy datas temperatures 100degree celciuse and 4degree celciuse,mass 0.5kg take latent heat of vapourisation 2.02times10raised to the power of minus6.(2)calculate the specific latent heat of fusion mass of calorimeter 0.01kg and mass of ice 0.09kg and 0...
*February 22, 2013 by Saen*

**math**

Problem The latent heat of fusion (solid become liquid) for ice is 79.8 cal/gram. How much ice can we melt with 1000 calories of heat? Problem Which would require more heat, melting 500 g of 0 C ice or turning 500 g of 100 C water into steam? Problem A 500 g sample of an ...
*October 6, 2008 by sherri*

**Chemistry**

The specfic heat of iron is 0.11cal/g C. The heat of fusion of iron, the heat required to convert iron from a solid to liquid at its melting point, is 63.7cal/g. Iron melts at 1530 C. How much heat must be added to 2g of iron at 25c to completely melt it?
*March 15, 2013 by Dan*

**Chemistry**

38.0kg mass of copper is melted to be cast into a graphite mold at a copper pipe foundtry. If the solid copper starts off at the normal melting temperature of copper and the liquid copper is put into the mold at the crystallization point of copper, how much heat is added to ...
*August 15, 2012 by Jacob*

**physics**

1. Assume that 10 g of steam is added to 100 g of water initially at 19C. The water is inside an aluminum cup of mass 35 g. The cup is inside a perfectly insulating calorimetric container that prevents heat flow from the outside environment. Find the final temperature of the ...
*December 5, 2013 by bano*

**physics**

Assume that 10 g of steam is added to 100 g of water initially at 19C. The water is inside an aluminum cup of mass 35 g. The cup is inside a perfectly insulating calorimetric container that prevents heat flow from the outside environment. Find the final temperature of the ...
*December 5, 2013 by bano*

**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**

Lithium metal is a highly reactive metal that oxidizes instantly in water or air. Given the data below, calculate the energy required to heat 10.0 g of Li from 150.0 C to 200.0 C. Molar heat capacity (solid) = 3.58 J/C mol Molar heat capacity (liquid) = 4.379 J/C mol ...
*April 25, 2013 by Johnny*

**Chemistry**

Ethanol (C2H5OH) has been produced since antiquity by the fermentation of fruits and vegetables. Given the following data, if 5.87 kJ of energy are transferred to 13.3 g of frozen ethanol at -130.0 C, what is the final temperature of the sample? Heat capacity (solid) = 0.97 J...
*April 25, 2013 by Johnny*

**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*

**physics**

A 1.3 Kg block of ice is initially at a temp of -5 degrees celsius. If 7.5 *10^5 J of heat are added to the ice, what is the final temperature of the system? I multiplied 1.3 Kg of ice by the specific heat of ice (2090), then I divided by the amount of heat added. I came up ...
*June 22, 2007 by tasha*

**chemistry**

Some properties of aluminum are summarized in the following list. normal melting point 658C heat of fusion 0.395 kJ/g normal boiling point 2467C heat of vaporization 10.52 kJ/g specific heat of the solid 0.902 J/gC (a) Calculate the quantity of energy required to heat 1.75 ...
*May 1, 2010 by Jake*

**Chemistry**

Some properties of aluminum are summarized in the following list. normal melting point 658C heat of fusion 0.395 kJ/g normal boiling point 2467C heat of vaporization 10.52 kJ/g specific heat of the solid 0.902 J/gC (a) Calculate the quantity of energy required to heat 1.75 ...
*May 1, 2010 by Charles*

**Physics**

lead melts at 328 degrees C. lead has a heat of fusion of 2.04X10^4 J/kg and a specific heat of 130 J/kgK. how much heat must be removed from 0.50 kg of molten lead (liquid) at 328 degrees C to make it all a solid chunk at 300 degrees C?
*November 18, 2010 by Brittany*

**Physics**

How much energy is required to change a 58 g ice cube from ice at −1◦C to steam at 101◦C? The specific heat of ice is 2090 J/kg ◦ C and of water 4186 J/kg ◦ C. The latent heat of fusion of water is 3.33 105 J/kg, its latent heat of ...
*January 30, 2013 by Tiffany *

**Phyics**

How much energy is required to change a 57 g ice cube from ice at −4◦C to steam at 107◦C? The specific heat of ice is 2090 J/kg ◦ C and of water 4186 J/kg ◦ C. The latent heat of fusion of water is 3.33 105 J/kg, its latent heat of ...
*July 8, 2013 by Beatles Lover *

**chem**

The specific heat of silver is 0.237 J/goC Its melting point is 961oC . Its heat of fusion is 11 J/g. How much heat (in J) is needed to change 17.5 g of silver from solid at 25oC to liquid at 961oC ? Add the heat required to warm the silver from room temp to the mp. Then add ...
*October 31, 2006 by mary*

**chemistry**

Tungsten has been used to make light bulb filaments since 1908. The melting point of tungsten is 3422 C and the heat of fusion is 35 kJ/mole. Calculate the entropy change associated with the melting of one mole of tungsten.
*October 24, 2007 by dan*

**Physics**

How much heat is necessary to raise the temperature of 3,439 grams of lead, from 20C solid lead to all liquid at 327C?
*November 12, 2012 by Anonymous*

**Physics**

The melting point of a solid is 90.0 degrees C. What is the heat required to change 2.5 of this solid at 40.0 degrees C to a liquid? The specific heat of the solid is 390 J/kg (K) and its heat of fusion is 4000 J/kg. A. 4.9 10^4 J B. 1.0 10^4 J C. 5.9 10^4 J D. 5.0 10^4 J I am...
*April 3, 2009 by sophie*

**Entropy**

Tungsten has been used to make light bulb filaments since 1908. The melting point of tungsten is 3422C and the heat of fusion is 35 kJ/mole. Calculate the entropy change associated with the melting of one mole of tungsten.
*October 24, 2007 by Matt*

**chemistry**

The heat of fusion of water is 335 J/g, the heat of vaporization of water is 2.26 kJ/g, and the specific heat of water is 4.184 J/deg/g. How many grams of ice at 0 could be converted to steam at 100 C by 9,946 Joules of heat?
*November 15, 2013 by Dakota*

**Physics**

You have left your bicycle outside in the backyard for three hours on a very cold day. Now you decide to go for a ride. The metal handlebars feel colder than the plastic hand-grips because: Question 4 options: A) The latent heat of fusion of the plastic is bigger than the ...
*August 15, 2011 by Skylar*

**chemistry**

Calculate the enthalpy of fusion of naphthalene (C10H8) given that its melting point is 128 Celsius and its entropy of fusion is 47.7 J (k*mol) .
*April 29, 2013 by Chloe*

**Chemistry - Heat of Fusion of Ice**

Conclusion question(s) from a lab we did to find the heat of fusion of ice: Does the value obtained for the molar heat of fusion depend on the volume of water used? Does it depend on the mass of ice melted? Does it depend on the final temperature of the mixture? The heat of ...
*October 1, 2006 by J.M.*

**physics**

The melting point of a solid is 90.0 d/C. What is the heat required to change 2.5 kg of this solid at 40.0 d/C to a liquid? The specific heat of the solid is 390 J/kg-K and its heat of fusion is 4000 J/kg. I got 2 different answers 2 different ways: 2.5(50)(4000) which is 5.0 ...
*April 3, 2008 by Jon*

**Physics**

You have collected exactly 2800 aluminum cans for recycling, each with a mass of 13.6 g. How much energy is needed to melt them if their initial temperature is 26.2◦C? Assume the specific heat, the latent heat and the melting point of aluminum are 899 J/kg ◦ C, 3....
*January 30, 2013 by Tiffany *

**physical science**

Suppose you are camping in the mountains and you need to melt 1.8 kg of snow at 0.0 degC to 70.0 degC. The specific heat of water is 4186 j/kg*C while the latent heat of fusion for water equals 3.34 x 10^5 J/kg. How much heat will be needed? Express in KJ.
*March 18, 2014 by Paul*

**chemistry**

Say you have two substances, A and B. A has a melting point of 300 degrees Celcius, while B has a melting point of 200 degrees Celcius. If you took a mixed melting point where the ratio of A is higher than B, what would the melting range look like? Would the melting point be ...
*January 25, 2014 by Louis*

**chemistry**

How much heat is required to heat 28 g of solid silver from 130 ◦ C to liquid silver at 961 ◦ C? The speciﬁc heat of solid silver is 0.235 J/g ◦ C, and the heat of fusion of silver at its melting point of 961 ◦ C is 11.3 kJ/g. Answer in units ...
*October 2, 2012 by Austin *

**chemistry **

the heat of fusion for thallium is 21 J/g, and its heat of vaporization is 795 J/g. Thallium's melting point is 304 degrees celsius, and its boiling point is 1457 degrees celsius. The specific heat of liquid thallium is 0.13 J/g degrees celsius. How much heat is needed to ...
*February 23, 2010 by billy*

**physics**

The wattage of a commercial ice maker is 226 W and is the rate at which it does work. The ice maker operates just like a refrigerator and has a coefficient of performance of 3.90. The water going into the unit has a temperature of 15.0C, and the ice maker produces ice cubes ...
*December 1, 2012 by angie*

**PHYSICS**

The wattage of a commercial ice maker is 226 W and is the rate at which it does work. The ice maker operates just like a refrigerator and has a coefficient of performance of 3.90. The water going into the unit has a temperature of 15.0C, and the ice maker produces ice cubes ...
*December 1, 2012 by ag*

**PHYSICS**

The wattage of a commercial ice maker is 226 W and is the rate at which it does work. The ice maker operates just like a refrigerator and has a coefficient of performance of 3.90. The water going into the unit has a temperature of 15.0C, and the ice maker produces ice cubes ...
*December 1, 2012 by HELP*

**ap chemistry**

How much heat is required to heat 19 g of solid silver from 100 ◦C to liquid silver at 961◦C? The specific heat of solid silver is 0.235 J/g ◦ C, and the heat of fusion of silver at its melting point of 961◦C is 11.3 kJ/g. Answer in units of kJ
*October 22, 2013 by gabriella*

**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*

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