Saturday

October 1, 2016
Number of results: 70,721

**Chemistry**

calculate the amount of heat energy in joules to condense 125g of steam at 100 degrees celcius and cool to the liquid to 15 degrees celcius?

*April 20, 2012 by Kimberly*

**physics**

The specific heat capacity is 1800 J/Kg/K .Calculate the amount of energy liberated when 7kg of the liquid cools from 70 Degrees Celcius to 35 degrees celcius

*June 1, 2013 by zaheer*

**Physics 11th Grade "HEAT' 2**

1) Emily is testing her baby's bath water and finds that is too cold,so she adds some hot water from kettle on the stove. If Emily adds 2.00 kg of water at 80.0 degree celcius to 20.0 kg of bath water at 27.0 degree celcius , what is the final temperature of the bath water? 2...

*March 14, 2013 by Isis*

**Chemistry**

A 35.0 g block of copper at 350.0 degrees celcius is added to a beaker containing 525 g of water at 35.0 degrees celcius. What is the final temperature of water?

*November 27, 2012 by Maryam*

**Chemistry**

A 30 ounce iron bar at 425 degrees Fahrenheit is placed in 2.00 quarts of water at 80.0 degrees Fahrenheit. What will be the change in temperature of the iron bar in degrees Fahrenheit? (Assume 1/3 heat lost to the surroundings) Specific heat of iron= .473 Joules/grams degrees...

*October 14, 2010 by Samantha*

**chemistry**

What is the total amount of heart absorbed by 100.0 grams of water when the temperature of the water is increased from 30.0 degrees Celcius to 45.0 degrees Celcius?

*March 16, 2011 by Kristina*

**Chemistry**

The density of water at 17 degrees celcius is 0.998774g/mL and at 18 degrees celcius it is 0.998595 g/mL. Calculate the density of water at 17.7 degrees celcius?

*March 13, 2011 by Renee*

**Chemisrty**

what is the molality of a 0.075m of ethyl alcohol in water at 25 degrees celcius. Assume the density of the solution at such low concentration is equal to that of water at 25 degrees celcius, 0.997g/ml

*February 13, 2011 by Kate*

**chem**

The solubility of KNO3 is 155 g per 100 g of water at 75 degrees celcius and 38.0 g at 25 degrees celcius. What mass (in grams) of KNO3 will crystallize out of solution if exactly 100 g of its saturated solution at 75 degrees celcius is cooled to 25 degrees celcius. i found ...

*October 15, 2008 by Mischa*

**physical science**

How many joules of heat are required to melt 40kg of ice at o degrees celcius?

*October 2, 2008 by Rosemary*

**physical scince**

answer the following question: QUESTION 4: What does it mean if a compound has a solubility of 15g in 100g of water at 0 degrees Celcius? A) 100 g of the compound will dissolve in 15 g of water at 0 degrees celcius B)15 g of the compound will dissolve in 100g of water at 0 ...

*December 12, 2010 by fatima*

**chemistry**

calculate the energy, in joules and calories required to heat 25.0g of water form 12.5 deg. celcius to 25.7 deg. celcius i know the answer just need to see how to do it especially the calories

*January 22, 2012 by shaun*

**Chemistry**

How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization ...

*September 16, 2008 by Jimmy*

**Chem**

How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization ...

*February 4, 2012 by Dan *

**Heat Energy**

A container holds 3kg of water at 25 degree celcius. If 0.5kg of iron at 80 degree celcius is added to the water in the contain. What is the? (i) final temperature of the container. (ii) Quantity of heat gained by water

*March 19, 2013 by Precious*

**Heat energy**

CORRECTION (a). 500g of copper is heated from 30 degree celcius to 120 degree celcius, what is the quantity of heat supplied?(b). If the same quantity of heat is supplied to 300g of water initial at 30 degree celcius. What will be the final temperature.

*March 19, 2013 by Precious*

**chem**

how much heat is required to vaporize 34.8g of water at 100 degrees celcious?

*November 16, 2012 by law-rece*

**Chemistry**

which of the following quantities is not required to calculate the amount of heat energy required to heat water from 25^OC to 55^OC? A-the mass of water sample. B-the initial temp. C-the heat of vaporization for water. D-the final temp. E-the specific heat of water.

*July 15, 2011 by John Height*

**chemistry**

A student used 6.3 x 10^3 J to heat up 50.0g of porcelain from 25.0 degrees Celcius to 45.0 degrees Celcius. What is the specific heat of porcelain?

*December 1, 2011 by Kdot*

**chemistry **

I have to calculate the vapor pressure of water at 25.0 degrees celicus. The heat of vaporization of water is 40.65 kj/mol and the vapor pressure of water is 92.7 Torr at 50 degrees celcius. I know I should use log10 P=A- B/C+T but I don't know how to work it out.

*January 30, 2015 by Mary*

**chemistry**

A 94.7 g sample of silver (s= 0.237 J/(g x Degree C)), initially at 348.25 Degrees C , is added to an insulated vessel containing 143.6 g of water (s=4.18 J/(g x Degree C)), initially at 13.97 Degrees C. At equilibrium, the finial temperature of the metal-water mixture is 22....

*November 14, 2012 by marcus *

**Physics**

Calculate the total entropy change hat occurs when 2kg of lead at 40 degrees celcius are placed in a very large quantity of water at 10degrees celcius. the specific heat of lead is 0.031 cal/g K).

*September 10, 2015 by Kelsey*

**Chemistry**

How much heat is required to warm 1.50 kg of sand from 20.0 C to 100.0 C?

*March 20, 2012 by Derek*

**Physics**

How much heat is added to a 10.0 g of ice at -20.0 degrees Celsius to convert it to steam at 120.0 degrees Celsius? compute and add the following heats: heat to heat ice from -20C to 0C heat to melt ice at 0C Heat to heat water from 0 to 100C heat to convert water to steam at ...

*March 5, 2007 by Marie*

**chemistry**

What quantity of heat is required to warm 53.7 g of liquid water from 0°C to 100°C?

*March 29, 2010 by rachel*

**physics**

You have a bathtub containing 100 ml of water at 25 degrees celcius. How long must you stir the water to bring the temperature of the water to 100 degrees celcius?

*March 24, 2010 by jonathan*

**physics**

how much heat is required to vaporize 7 grams of ice initially at 0 degrees celsius when the latent fusion of ice is 80 cal/g, the vaporization of water is 540 cal/g, and the specific heat of water is 1 cal/(g x C)?

*February 19, 2010 by elisabeth*

**Chemistry**

1. How much heat is absorbed when 63.7g H(small 2)O [water](l) at 100 degrees C and 101.3 kPa is converted to steam at 100 degrees C? Express your answer in kJ. Is there an equation? 2.How much heat (in kJ) is released when 0.677 mol NaOH(s) is dissolved in water? (Steps?) ...

*May 12, 2010 by Anonymous*

**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**

How much heat is required to raise the temperature of a 65-g sample of water from 32 degrees celsius to 65 degrees celsius

*February 11, 2012 by Lisa*

**Chemistry**

80.0 mL of water is initially at room temperature (22degrees C). A chilled steel rod at 2 degrees C is placed in the water. If the final temperature of the system is 21.2 degrees C, what is the mass of the steel bar? Specific heat of water = 4.18J/g(degreesC) Specific heat of ...

*October 22, 2010 by Ellen*

**math chem**

Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth¡¯s oceans, because of their high heat capacity, can absorb heat and therefore act to slow down global warming...

*January 24, 2011 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**

How much heat is required to bring 1.0kg of water from 25 degrees celsius to 99 degrees celsius?

*October 26, 2012 by Kayla*

**Chemistry**

How much energy is required to heat 36.9g of ice at 0 degrees celsius to water at 0 degrees celsius?

*March 2, 2013 by Maria*

**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) q = mass x specific heat x delta T? q = mass x heat...

*February 4, 2008 by Lauren*

**Chemistry**

The heat of fusion for water is 80cal/g. The specific heat of liquid water is 1.00cal/g. How many calories of heat are released when 20g of water at 30 degrees is cooled to 0 degrees and frozen to ice at 0 degrees?

*July 19, 2010 by Leah*

**Chemistry**

A 45-kg sample of water absorbs 345 kJ of heat. If the water was initially at 22.1 degrees celcius, what was the final temperature?

*September 30, 2012 by Anonymous *

**chem**

How much heat is required to heat 0.1 g of ice at −30 degrees C to steam at 100 degrees C

*March 1, 2012 by sammy *

**Chem**

The specific heat capacity of aluminum is .89 J/y degrees C. How much heat is required to change the temp of 1500g aluminum pan from 25 degrees C to 100 degrees C?

*October 17, 2010 by Emily*

**Chem**

The specific heat capacity of aluminum is .89 J/y degrees C. How much heat is required to change the temp of 1500g aluminum pan from 25 degrees C to 100 degrees C?

*October 17, 2010 by Emily*

**Lauren**

The specific heat of water is at 4.184J/g * degree C. How much heat is evolved, or absorbed, when the temperature of 9.00 mol of liquid water cools from 38 degrees C to 28 degrees C? How do I start this problem

*November 16, 2007 by Chemistry*

**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**

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) q = mass x specific heat x delta T? q = mass x heat...

*February 4, 2008 by Lauren*

**ap chemistry!! help!!**

some solutes have large heats of solution, and care should be taken in preparing solutions of these substances. The heat evolved when sodium hydroxide dissolves is 44.5 KJ/mol. What is the final temperature of the water, originally at 20.0 degrees Celcius. used to prepare 500....

*January 9, 2007 by john*

**Chemistry 106 ch 11**

Calculate the heat released when 73.5 g of steam at 122.0 C is converted to water at 39.0C. Assume that the specific heat of water is 4.184 J/g C, the specific heat of steam is 1.99 J/g C, and change in heat vap =40.79 kJ/mol for water.

*February 15, 2014 by alex*

**chemistry**

How much heat (in Kj ) is required to warm 10.0g of ice, initially at -11.0 C, to steam at 112.0 C?

*April 20, 2012 by haley*

**Chemistry**

How much heat (in Kj ) is required to warm 10.0g of ice, initially at -11.0 C, to steam at 112.0 C?

*April 20, 2012 by Haley*

**Science**

If you wish to warm 100 kg of water by 20° C for your bath, show that 8370 kJ of heat is required.?

*March 13, 2014 by Reggie*

**Physics**

If you wish to warm 100 kg of water by 20° C for your bath, show that 8370 kJ of heat is required.?

*March 13, 2014 by Reggie*

**CHEMISTRY**

I put down all the info that I found but I cant figure out the questions 1 & 2 at the bottom!! Empty Calorimeter- 11.6 g Room temp - 21 degrees celcius Three different experiments of 50mL 1(M) HCl reacts with 0.15 g Mg, 0.25g Mg, and 0.35g Mg respectively. The maximum ...

*November 8, 2010 by Anonymous*

**chemistry**

How much heat energy in KJ is evolved by a reaction in a calorimeter in which the temperature of the calorimeter and water increases from 20.91 degrees C to 26.45 degrees C? The bomb has a heat capacity of 469 J/degrees . The Calorimeter contaains 792 grams of water.

*December 8, 2010 by Brittany*

**chemistry**

The heat of solution of potassium acetate (KC2H3O2) in water is -15.3 kJ/mol. If 18.8 g of KC2H3O2(s) is dissolved in 655 mL of water that is initially at 25.8 °C, what will be the final temperature (in degrees Celcius) of the resulting aqueous solution? (Assume no heat ...

*March 3, 2015 by Fiona*

**physics**

Determine the quantity of heat required to convert 1kg of ice at −20 degrees Celsius to water at 100 degrees Celsius? Specific heat capacities of water and ice water are 2302 J/kgK and 4186 J/kgK respectively

*November 19, 2014 by Sam*

**Science check**

I was wondering if someone could check the problems for me? Thanks I can go back and show work if needed..this was just easier to type out. 1)An object has a mass of 615 grams and a volume of 105cm3.What is the density of the object? answer 5.86 gm/cm3 2) A player uses a ...

*May 29, 2007 by Anonymous*

**Physics**

How much heat is absorved when a temparature of a piece of iron of mass 0.1kg and specific heat capacity 2*10 rest to power of 2 J/kg/k is rise from 25degree celcius to 75degree celcius

*February 20, 2016 by Samuel*

**Physics Heat**

1) Peter is heating water on the stove to boil eggs for a picnic. How much heat is required to raise the temperature of his 10.0-kg vat of water from 20.0℃ to 100.0℃? Formula>> Q=mTcp 2)Under the spreading chestnut tree of the village blacksmith dunks red-hot...

*April 10, 2013 by Isis*

**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*

**Science**

90 calories of heat is added to 1 gram of fresh water with an initial temperature of 10 degrees Celcius. What is the final temperature of this liquid? (latent heat of fusion = 80cal/g°C, latent heat of vaporization = 540 cal/g°C)

*February 26, 2015 by melissa*

**science**

jay heated 120mL of water that was 20 degrees celsius to 80 degrees celsius. a)how much did the temperature of water change? b) how much heat did jay add to the water? c) if jay used a liquid that was not water, the specific heat would not equal:(circle best answer) 0cal/g/...

*October 14, 2012 by Johna *

**chemistry**

the boiling point of water at 735mmHg is 99.073 degrees celcius. What mass of NaCl should be added to 3.11kg water to increase the boiling point to 100.000 degrees celcius? Kb for water = 0.510 K Kg mol-1

*October 6, 2010 by Kell*

**Chemistry**

What is the molality of a 0.065M solution of ethyl alcohol in water at 25 degrees Celcius? (Assume the density of the solution at such low conentration is equal to that of water at 25 degrees Celcius, 0.997 g./mL)

*March 1, 2011 by Shai*

**chemistry**

How much heat is required to convert 0.4 kilograms of ice at 0 degrees celsius to water at the same temperature?

*March 1, 2011 by Anonymous*

**Chem 103**

a piece of gold is heated to 100 degrees celsius. A piece of copper is chilled in an ice bath to 0 degrees celsius. Both pieces of metal are placed in a beaker containing 150 g of water at 20 degrees celcius. Will the temperature of the water be greater than or less than 20 ...

*April 15, 2013 by Anonymous*

**algebra**

At a crime scene, police officers find a murder victim in a tub full of warm water. A thermometer shows that the water temperature is 75 degrees F and the air temperature is 70 degrees F. It is known that most people fill a tub with water at 100 degrees F. Find Newton's Law of...

*December 12, 2012 by Andrea*

**Chem.**

Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius??

*February 10, 2010 by Joseph*

**Chemistry**

7750 J of energy is added to a 325g stone at 24.0 degrees celcius. The temperature increases by 75.0 degrees celcius. What is the specific heat of the stone?

*November 27, 2012 by Maryam*

**Physics - Heat and phase change**

8.94 kJ of energy is available to melt 20 g of ice (initially at 0*C) and subsequently to warm the water. What is the water's final temperature in degrees Celsius?

*March 19, 2013 by Jos*

**Chemistry**

How many joules of heat are lost by 3399kg granite as it cools from 41.7 degrees Celcius to -13.3 degrees Celcius? answer must be in joules not kJ

*May 19, 2010 by Ev*

**chemistry**

Can somebody please help me with this question? That'd be great. Thanks! Determine the amount of heat needed in the following: the number of calories to heat 25 grams of water from 22 degrees celcius to 44 degrees celcius. Q= m c deltaTemp = 25g*1cal/gC*(44-22)C =25*22 ...

*October 4, 2006 by Pyrgus*

**chemistry**

The vapor pressure of dichloromethane, CH_2Cl_2, at 0 degrees celcius is 134 mmHg. The normal boiling point of dichloromethane is 40 degrees celcius. Calculate its molar heat of vaporization (in kJ/mol).

*January 31, 2010 by jack*

**Math**

An object is heated to 90 degrees Celcius and is then allowed to cool in a room whose air temperature is 25 degrees celcius. If the temperature of the object is 75 degrees celcius after 10 minutes, when will its temperature be 50 degrees celcius? I have no idea how to do this...

*November 21, 2010 by Hannah*

**Math**

An object is heated to 90 degrees Celcius and is then allowed to cool in a room whose air temperature is 25 degrees celcius. If the temperature of the object is 75 degrees celcius after 10 minutes, when will its temperature be 50 degrees celcius? I have no idea how to do this...

*November 21, 2010 by Hannah*

**Physics**

How many grams of ice must be added to 100 grams of water at 60 degrees so that its temperature drops to 20 degrees celcius? As far as i know I have to use: (Mass)*(specific heat of water) *(finaltemperature - initial temperature = ??

*January 7, 2010 by Jose*

**Chemistry**

what is the final temp of the combination when 50 grams of chromium at 15 degrees celcius is added to 25 milliliters of water at 45 degrees celcius?

*August 7, 2010 by Nick*

**Physics**

How do I find out how much heat it takes to raise the temperature of 100 grams of aluminum from 50 degrees celcius to 80 degrees celsius. The specific heat is 900j/kg First I did 100*30*900 and it equalled 2,700,000. that seems to high, is it? I then multiplied 100*30*.9 and ...

*June 27, 2010 by Carissa*

**Physics**

How much heat, expressed in Kwh, is required to raise the temperature of water in a 20,000 gallon pool by 10 degrees C. ?

*April 26, 2013 by Wolter*

**thermochem**

A meal is 8000kJ. If all the energy is converted to heat, how much iced water with a temperature of 0 degrees must a person drink to maintain body temperature of 37 degrees? How do I solve this - using the fact that 1mL water by 1 degree is 4.2Joules? Heat gained by water = ...

*February 6, 2012 by Cole*

**algebra**

At a crime scene, police officers find a murder victim in a tub full of warm water. A thermometer shows that the water temperature is 75 degrees F and the air temperature is 70 degrees F. It is known that most people fill a tub with water at 100 degrees F. Find Newton's Law of...

*December 12, 2012 by Andrea*

**chemistry**

you dissolve x in 175g of water to make a saturated solution at 50 degrees celcius. if the solution is cooled to 10 degrees celcius, how many grams of x settle out? (x=15.0 at 50 degrees)

*October 13, 2010 by steve *

**physics**

0.2 kg of ice at 0 degrees celcius is mixed with 500g of water at 25 degrees celcius. What is the resulting temperature?

*June 22, 2010 by Gibbons*

**Chemistry**

How many grams of ice are needed to cool 250 ml of water from 75 degrees celcius to 5 degrees celcius?

*April 12, 2011 by Thao*

**College Chemistry**

Calculate the heat in joules needed to warm 225g of water from 88.0 degrees Celsius to its boiling point 100.0 degrees Celsius

*October 24, 2012 by Alex *

**p.s**

calculate the mass of ice required to lower the temperature of 300 gm of water at 40degree celcius to water at0 degree celcius.

*August 28, 2016 by hema*

**Physics**

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

*October 24, 2013 by youlifex*

**chemistry**

how many joules of heat are used in raising temp of 25 g of water from 20 to 35 degrees celcius

*March 11, 2010 by jill*

**chemistry**

you have 2.0 grams of water at 0 degrees Celcius. how many kilojules of heat will freez it?

*April 30, 2010 by Anonymous*

**biology**

What happens to proteins dissolved in water when you heat it to 100 degrees celcius?

*November 4, 2010 by Anonymous*

**Chemistry**

A 35.00 mL sample of water at 30.0°C is placed in an open container with an external pressure of 1.00 atm. 30.0 kJ of heat is added to the water sample. The density of water is 1 g/mL. (a) How many grams of liquid water remain at the end of the process? Like, the equation I ...

*February 11, 2015 by N*

**biology**

between 5 degrees celcius and ten degrees celcius, which solute shows the greatest change in the amount that can be dissolved in 100 grams of water?

*October 10, 2010 by Anonymous*

**Chemistry**

calculate the enthalpy change in delta H foor heating 250 grams of liquid water from 0 degrees celcius to 100 degrees celcius.

*February 11, 2011 by Bri*

**Chemistry**

How many joules (J) are needed to increase the temperature of 43.0g of aluminum from 25 degrees celcius to 50 degrees celcius? (Cp of Al=0.90J/g degrees of celcius) I also need the formula, data, and answer.

*October 10, 2013 by Jaret*

**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*

**physics**

swimmers often notice that when they start to swim in a still body of water after a hot sunny day the surface water is warm but the deeper water is cold. why this happens?explain. (is it that the heat of the sun can only heat up the surface of the water?) swimmers often feel ...

*May 3, 2007 by Pauline*

**chemistry**

what mass of steam intially at 130 degree celcius is needed to warm 200 grams of water in a 100 gram container from 20 to 50 degree celcius

*January 20, 2011 by mike*

**Chemistry**

How much energy would be needed to turn 183.7 g of Ice at -27 degrees celcius to steam at 135 degrees celcius?

*November 15, 2013 by Lindsay*

**chemistry**

Propane gas is used to heat a tank of water. If the tank contains 200 L of water, what mass of propane will be required to raise its temperature from 20 degrees C to 65 degrees C. The heat of combustion for propane is -2220 kJ/mol.

*November 4, 2010 by Ray*

**AP Environmental Science**

Consider the following heats, copper: 0.384J/g degrees, glass:0.502J/g degrees, water: 4.18J/g degrees, and lead:0.159J/g. Which substance once warmed, would be more likely to maintain its heat and keep you warm through a long party on a cold night?

*October 10, 2012 by Becca*

**chemistry**

What is the specific heat of a substance if it takes 250 J of heat energy to raise the temperature of a 20 g sample from 20 degrees celsius to 45 degrees celcius?

*May 31, 2010 by Toni*

**Chemistry**

How much energy does it take to convert 750 grams of ice at 0 degrees Celsius to liquid water at 40 degrees Celsius? (Specific Heat of water = 4.18 J/g*C and the heat of fusion = 334 J/g)

*May 10, 2012 by Morgan Chemistry*