Friday
October 31, 2014

Search: a metal sample weighing 45.0 g and at a temperature of 99.1

Number of results: 20,154

chemistry
A heater caused the temperature of a 550 g Aluminum block to change from 22 degrees C to 145 degrees C. How many calories were required to heat the metal block?
April 11, 2011 by cam

Chemistry
A sample of zinc metal reacts completly with an excess of hydrochloric acid: Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g) The hydrogen gas produced is collected over water at 25.0 C. The volume of the gas is 78.0 L & the pressure is 0.980 atm. Calculate the amount of zinc metal ...
August 12, 2011 by ChemLover

chemistry
The phosphorus in a completely dried fertilizer sample weighing 0.4498 grams was precipitated as MgNH4PO4*6H2O. The precipitate weight was determined to be 236.8 mg and ignited to Mg2P2O7. The weight of the ignited precipitate was 268.9 mg. Calculate the percent phosphorus. My...
August 31, 2007 by smiley

chemistry
a 60.0 g sample of chromium at 82.0 degrees celsius was place in 80.0 g of water. Assume there is no loss of heat to the environment. What is the final temperature of the water and chromium? The initial water temperature was 24.0 degrees celsius
November 12, 2013 by Anonymous

Chemistry
How do i calculate the amount of heat required to raise the temperature of an 89 sample of water from 40 to 60.
February 20, 2010 by Kesha

Chemistry
Calculate the amount of heat required to raise the temperature of a 54 g sample of water from 5C to 20.C.
September 15, 2010 by Ben

chemistry
Calculate the amount of heat required to raise the temperature of a 25 sample of water from 7 to 25.
September 20, 2010 by Anonymous

chemistry
a 25.0 sample of nitrogen has a volume of 50.0L and a pressure of 630. mmHg. what is the temperature of the gas?
March 29, 2011 by Anonymous

chemistry
at what temperature will a gas sample occupy 6.6L if it originally occupies 14.1L at 14.4 degrees celcius
June 29, 2011 by cindy

chem
If 7.59 moles of an ideal gas has a pressure of 4.41 atm, and a volume of 71.59 L, what is the temperature of the sample?
December 1, 2013 by dinah

Chemistry
Can somebody help me with this question? Zinc metal is placed in a solution of copper ions and undergoes an oxidation-reduction reaction. Which direction is the spontaneous reaction? Zn metal goes into solution. Cu(II) ions come out. Zn + Cu+2 ==> Zn+2 + Cuo Zn metal is ...
February 10, 2007 by Lisa

calculus
A box is contructed out of two different types of metal. The metal for the top and bottom, which are both square, costs $5 per square foot and the metal for the sides costs $2 per square foot. Find the dimensions that minimize cost if the box has a volume of 40 cubic feet.
April 14, 2014 by Griffin Bilskie

chemistry
A 50g chunk of metal (c=0.0506 j/gC) is heated to 60C. it is then dropped into a calorimeter(c=1.40 j/gC,m=5.0 g)that contains 100.0g of an unknown liquid. the temperature of the liquid raises from 15C to 20C.What is the c of the calorimeter?
September 23, 2014 by liz

chemistry
1. Nitrogen gas and sodium liquid are produced by the decomposition of sodium azide NaN3 (s). what volume of nitrogen gas, measured at 25 C and 0.980 atm, is produced by the decomposition of 62.5 g of sodium azide? 2. A gas sample in a container with a volume V at a ...
December 9, 2010 by Helen

chemistry
An engine goes through the following cycle with 2.60 moles sample of a diatomic gas. I. an isothermas expansion from point a to point b. II. a constant pressure compression from point b to point c. III. an adiabatic compression from point c to point a. We are given point a has...
December 7, 2009 by dan

chemistry
I did an experiment where i put iron nail with zinc metal wrapped around it in agar solution. the solution turned pink. I have to find the anode: anode reaction: cathode (remember, a metal can be an inactive electrode): cathode reaction (there arent any metal ions present, so...
March 10, 2009 by Anonymous

CRC
A sample of ideal gas is in a sealed container. The pressure of the gas is 675torr , and the temperature is 28\, ^{\circ}C . If the temperature changes to 91\, ^{\circ}C with no change in volume or amount of gas, what is the new pressure, P_2, of the gas inside the container?
April 28, 2013 by Touch

physics
How does the resistance of a piece of metal change if both its length and its diameter are reduced to one half their original values? .. im confused because i dont know what the shape of the metal is...please help!
March 7, 2010 by Anonymous

Chemistry
If 200 g. of an unknown metal oxide, M2O3, upon reaction with chlorine yields 376 g of M2Cl2, then the metal M is: a. Indium b. Aluminum c. Gallium d. Silicon e. boron
May 5, 2011 by Kamila

chemistry
3. Based on your answer in question 2, determine the percent error of your calculated specific heat capacity value of your unknown metal using the specific heat capacities of known metals below. Metal Specific Heat Capacity Nickel 0.440 Tin 0.210 Silver 0.237 Magnesium 0.140 ...
April 4, 2013 by lex

physic
2. Rank the following in the order of how much of a corona discharge they would produce, from highest to least (e.g., if D is highest, then A, C, and B is lowest. enter DACB). Explain your response. a. a large round metal ball hooked to a high voltage battery b. a sharp metal ...
January 21, 2011 by sabrina

science
2. Rank the following in the order of how much of a corona discharge they would produce; from highest to least (e.g., if D is highest, then A, C, and B are lowest. entering DACB). Explain your response. a. a large round metal ball hooked to a high voltage battery b. a sharp ...
June 22, 2011 by i

physics
A sample of anthracite has a moisture content of 5% when mined and an energy density of 35 kJg-1 when completely dried. Assuming that during combustion, the temperature of the water in the un-dried coal is raised from 20.0oC to 100.oC, and then vaporized at 100.oC, estimate ...
March 10, 2010 by k

chemistry
A 13.8 g piece of Zn metal was heated to 98.6 oC and then dropped in 45.6 g of water at 25.0 oC. Assuming that no heat is lost to the surroundings, determine the specific heat capacity of Zn if the final temperature of the water was 27.1 oC C=6461.39
April 25, 2013 by Chade

Chemistry
You have a metal tank containing 74.0 moles of nitrogen gas at a pressure of 15.0 atm. If the pressure is measured at a temperature of 25.0 C, then the volume of the tank must be ___ liters
October 23, 2013 by Daud

Math
If a metal bar at a temperature of 20 degree celcius is dropped in boiling water how long will it take for the bar to reach 98 celcius at a rate of 2 degrees per second
February 21, 2014 by Derek

science
a 1.0 kg metal head of a geology hammer strikes a solid rock with a speed of 3.9 m/s. assuming all the energy was retained by the hammer head, how much will its temperature increase?
April 8, 2014 by paige

Math (Ms. Sue! Anyone!)
1)At 1 p.m., Lin records an outside temperature of 14.8F. At 3 p.m... she records the outside temperature and notices the temperature had increased by 22.6 degrees. What was the temperature that she recorded at 3 p.m.? ( no multiple choice) *confused on this question* 2) (x...
September 15, 2014 by Anonymous

physics
a 200g aluminum container has 500g of water with an initial temperature of 22 degree celsius. The following heated pieces of metal are dropped into water at the same time as follows: 300g piece of aluminum heated at 100 degree celsius; a 50g piece of copper heated at 80 degree...
July 31, 2012 by Anonymous

physics
a 200g aluminum container has 500g of water with an initial temperature of 22 degree celsius. The following heated pieces of metal are dropped into water at the same time as follows: 300g piece of aluminum heated at 100 degree celsius; a 50g piece of copper heated at 80 degree...
July 31, 2012 by Anonymous

math
1)At 1 p.m., Lin records an outside temperature of 14.8F. At 3 p.m... she records the outside temperature and notices the temperature had increased by 22.6 degrees. What was the temperature that she recorded at 3 p.m.? ( no multiple choice) *confused on this question* 2) (x...
September 15, 2014 by Anonymous

Chemistry
A metal element (M) forms a hexadentate complex with the ligand ethylenediammine (en). Its formula is M(en)32+. The metal ion and the ligand do not absorb in the visible region of spectrophotometer and a 1.00 cm cuvette, the following absorbances were measured for various ...
August 13, 2012 by John

chemistry
Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0011 % Pb by mass. How much of the water (in mL ) contains 165mg of Pb? (Assume a density of 1.0 g/ml.)
December 7, 2010 by Lisa, Help needed!

Chemistry
A metal M forms the sulphate M2(SO4)3 . A 0.596 gram sample of the sulphate reacts with excess BaCl2 to give 1.220 g BaSO4. What is the atomic weight of M? (Atomic weights : S = 32, Ba = 137.3)
July 26, 2014 by Susan

intro chem HELp please
1. Zinc is often used to calibrate calorimeters because it undergoes a very sharp phase transition from the solid to the liquid at 419.5oC. Calculate the enthalpy change when 5 g of zinc metal is heated from 100oC to the point where the entire sample is melted. (The heat of ...
November 5, 2010 by John

chemistry
The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In a particular bomb calorimeter (initially at room temperature), the combustion of 0.1182 g of salicylic acid, in the presence of excess oxygen, causes the temperature of the ...
September 25, 2014 by korko

calculus
A box is constructed out of two different types of metal. The metal for the top and bottom, which are both square, costs $4 per square foot and the metal for the sides costs $4 per square foot. Find the dimensions that minimize cost if the box has a volume of 50 cubic feet. ...
November 11, 2011 by saud

Calculus
A box is constructed out of two different types of metal. The metal for the top and bottom, which are both square, costs $2 per square foot and the metal for the sides costs $7 per square foot. Find the dimensions that minimize cost if the box has a volume of 30 cubic feet. ...
November 13, 2011 by Kayla

chemistry
Calculate the mass in grams for a gold sample that absorbs 225 to change its temperature from 16.0 to 36.0.
February 3, 2011 by Heather

chemistry
a sample of iron (35.0g) absorbs 5.50J. of heat. calculate the increase in temperature that occurs
November 3, 2011 by payton

Chemistry
how do i calculate the temperature in Celsius of a 3.50L,0.75 mole sample of ammonia at 1.0 atm of pressure
March 14, 2012 by Jerrad

Chem
You have a 46.0 G sample of H20 at a temperature of -58.0*C. How many joules of energy are needed to heat the ice to 95.3*C?
May 14, 2012 by Joel

chemistry
if a 3.72 gram sample of nitrogen occupies a 2.50 liter container at 1.08 atm, what is the temperature in Celcius?
January 24, 2013 by jessica

chemistry
What is the specific heat of an unknown substance if a 2.53 g sample releases 13.1 cal as its temperature changes from 25.5C to 21.3C?
April 17, 2013 by ching chong

chemistry Ap
How much heat must be added to 50.0g of aluminum metal at 25 degrees C to raise its temperature to 125 degrees C? I have about 20 of these left so if you can do this and work it out and show me how you did it it would be great so I can use it as a guide for the next 19. Thanks.
February 8, 2008 by mhaidar9108

PHYSICAL SCIENCE
A 1.0 kg metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the hammer head, how much will its temperature increase?
November 2, 2007 by Sarah

algebra
a metal stays solid a fahrenheit temperature below 1756.7 degrees. determine (in terms of an inequality) Celsius temperatures for which the metals stays solid. use formula F=9/5C +32.
December 3, 2010 by norma

Physics
When UV light of wavelength 295nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.50eV. What is the work function of the metal? W0 in eV Please someone help me out. Thank you.
April 22, 2013 by Sheila

Algebra I
A sample of radioactive material weighing 45 grams has a decay rate of 4.25% each day. The equation y = 45(2.7)0.0425t can be used to find the amount of material that still remains, where t is the number of days that have passed. Approximately what is the amount of material ...
March 22, 2011 by Sarah

chemistry
when aluminum metal reacts with iron (III) oxide to form aluminum oxide and iron metal, 429.6 kJ of heat are given off for each mole of aluminum metal consumed, under constant pressure and standard conditions. What is the correct value for the standard enthalpy of reaction in ...
December 2, 2008 by sylvia

Chemistry
If given: A 1.4470g sample of an oxide of gold was reduced with ethane to 1.2900g of gold metal. What is the simple formula of the original gold oxide?
September 18, 2007 by Cat

statistics
What are the sample median and the mode for males? The sample mean mark of the 50 male students is 8.30. If the sample mean for the entire sample is 8.42, what is the sample mean for the 75 female students?
September 12, 2012 by Maria

statistics
What are the sample median and the mode for males? The sample mean mark of the 50 male students is 8.30. If the sample mean for the entire sample is 8.42, what is the sample mean for the 75 female students?
September 12, 2012 by Maria

Physical science
A 1.0kg metal head of a geology hammer strikes a solid rock with a velocity of 5.0m/s. Assuming all the energy is retained by the hammer head, how much will its temperature increase?
November 8, 2010 by Anonymous

Chem
What equation can I use to solve this kind of problem? A metal undergoes electrolytic reduction according to ne- + Mn+ ===> M. What current (in Ampres) must be provided to deposit the metal at a rate of 1.914 mol/hr if n = 3?
March 30, 2008 by Ginger

chemistry
11.31) solve for the new pressure when each of the following temperature changes occurs, with n and V constant: a. a gas sample has a pressure of 1200 torr at 155 celcius. what is the final pressure of the gas after the temperature has droped to 0 celcius? 1200 x12 celcius/0 ...
June 27, 2010 by Jetta

chemistry
The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In a particular bomb calorimeter (initially at room temperature), the combustion of 0.1182 g of salicylic acid, in the presence of excess oxygen, causes the temperature of the ...
September 27, 2014 by korko

Chemistry
I've got the specific heat of a metal for three trials. t1= .186 j/gdegrees C t2= .178 j/gdegrees C t3=.128j/gdegrees C the mean of the specific heat is .164 j/gdegrees C we're supposed to find which metal it is from a "CRC" handbook. I've tried and can't find any metal with ...
March 10, 2010 by Abdullah

Chemistry
Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0012% Pb by mass. How much of the water in milliliters contains 145 mg of Pb? (Assume that the density of the solution is 1.0g/mL.)
November 30, 2010 by Kelsey G

chemistry
Here is the question: sodium hydride reacts with excess water to produce aqueous sodium hydroxide and hydrogen gas: NaH(s)+H2O-->NaOH(aq)+H2(g) A sample of NaH weighing ________g will produce 982mL of gas at 28.0 C adn 765 torr, when the hydrogen is collected over water. ...
June 17, 2009 by Gweedo

physics
a 0.03 mol sample of helium is taken through a cycle. the temperature of state A is 400K. calculate V.
June 9, 2008 by shelly

Chemistry
If 42.8 L of helium gas is collected at a temperature of 277K and has a mass of 4.84 grams, what is the pressure of the sample in torr?
December 7, 2011 by Cami

science
If the pressure of 20.0 mL of a gas sample is increased by 4 times and the absolute temperature is doubled, what is the new volume?
October 30, 2012 by Mickeykalle

chemistry
A sample of gas has a mass of 0.585g . Its volume is 110mL at a temperature of 95^\circ C and a pressure of 745mm\;Hg .
December 12, 2012 by sydney

Chem
What will be the temperature of a 3.5 gram sample of carbon dioxide gas in a 2.5 liter container at .955 atm
April 1, 2013 by Ben

Chemistry
If 5.01 moles of an ideal gas has a pressure of 4.81 atm, and a volume of 86.95 L, what is the temperature of the sample in degrees Celsius?
November 19, 2013 by Noelia

Physics
Jenny measured the temperature of the water in a beaker, set the beaker aside, and then measured the temperature again after an hour. If the initial temperature of the water was 30C and the final temperature was 20C, which of the following could be the temperature of the ...
August 23, 2012 by Meka

Algebra 1
The temperature outside was 72 degrees at 6 am. The temperature rose 4 degrees per hour for the next 12 hours. The total temperature is a function of the number of hours the temperature rose. What was the temperature at noon? (also write an equation)
November 20, 2013 by Cristian

Chemistry
I've seen the posts on solving this particular equation, and I know the answer is right in front of me. I'm still having trouble understanding why... a 42g piece of ice at 0.0 degrees C is added to a sample of water at 7.8 degrees C. All the ice melts and the temperature ...
September 22, 2012 by Elliott

College Chemistry
I need help with this question!! a sample of pure KHP weighing .8097g dissolved in water and titrated with 40.25 mL of NaOH solution. The same NaOH solution was used to titrate a solution of a weak diprotic acid H2X. A sample of 0.18694g of the weak acid was first dissolved in...
April 25, 2012 by Emily

Chem
A 53.31-g sample of water at 88.8 degrees C is added to a sample of water at 23.9 degrees C in a constant- pressure calorimeter. If the final temperature of the combined water is 43.3 degrees C and the heat capacity of the calorimeter is 26.3 J/degrees C, calculate the mass of...
November 2, 2012 by k

Chemistry
A sample of Oxygen has occupies 1.00x10^6mL at 575mm Hg is subjected to a pressure of 1.25atm. What will the final volume of the sample be if the temperature is held constant v2=(p1)(p2)/p2 I'll have to convert 1.25atm to mm first 1.25atm*760mm/1.0atm = 950. mm V2=(575mm)(1....
March 18, 2009 by Chopsticks

physicis
A 1.0 kg metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the hammer head, and that it's heat capacity is 0.11 cal/(gC), how much will its temperature increase?
February 7, 2013 by Anonymous

Chemistry
A shiny gold colored car of metal weighting 57.3g has a volumes of 4.7cm^3. Is the bar of metal pure gold?
September 20, 2007 by Charles

science
I am a metal. I am a transition metal. I have the smallest atomic radius in my group. I have 6 valence electrons. What element am I?
September 22, 2009 by Mat

Chemistry
When 1.187g of a metallic oxide is reduced with excess hydrogen, 1.054g of the metal is produced. How do you determine what the metal oxide is?
May 18, 2011 by Josh

Fluid ''Physics''
A block of metal floats in oil of density 700Kg/m3 with 3/4 of volume in mass. Find the density of metal.
November 6, 2011 by Said

chemistry
A metal block of mass 11.5 g gives off 360 J of heat while cooling from 99.7 to 32.5 oC. What is the specific heat of the metal in J g-1 oC-1?
March 26, 2013 by d

chemistry
A metal block of mass 11.5 g gives off 360 J of heat while cooling from 99.7 to 32.5 oC. What is the specific heat of the metal in J g-1 oC-1?
March 26, 2013 by d

math
A metal sphere has a mass of 1 kg. 1 cubic centimeter of this metal has a mass of 4.8 grams. find the radius. how do you work this out?
September 22, 2014 by maya

chemistry
Which of the following would lower the vapor pressure of a sample of butanol in a closed container? I) decreasing the temperature of the sample II) decreasing the size of the container III) draining off some of the liquid a. I, II and III b. I and II c. II and III d. I and III...
January 28, 2011 by john

Chemistry
The density of an unknown metal is 1.55 and its atomic radius is 0.197 . It has a face-centered cubic lattice. What is the atomic weight of this metal?
February 20, 2010 by Amanda

chemistry
same masses of different metal carbonates are fully decomposed. why is the volume of carbon dioxide different for each metal carbonate?
July 6, 2013 by lolly

Chemistry
Would flame test be useful for detecting metal ions present in a mixture of metal ions?
October 1, 2008 by Martimer

Chemistry
a sheet of metal is 97.4 mm wide and 59.4 mm long. if it weighs 9.788g and the density of the metal is 7.23g/cm^3, what is the thickness of the sheet(in mm) ?
September 12, 2011 by Smarth

ORG CHEM LAB
Im doing a conclusion on a lab of acetaminophen. We were to take a melting point of the crude smale of acetaminophen and melting point of the crystallized acetaminophen. The mp for crude sample: 169.2 degree C The mp for crystallized sample: 172. degree C Why the change in mp'...
February 26, 2007 by Anonymous

Physics
Consider a piece of metal that is at 5 deg C. If it is heated until it has twice the internal energy, its temperature will be. a)556 deg C b)283 deg C c)273 deg C d)278 deg C e)10 deg C
November 19, 2012 by S

science
An unknown metal has a volume of 20cm^3 and a mass of 54g. What is the likely identity of the unknown metal? could i please have some help with this? ur help is appreciated. :D
September 29, 2009 by becca

math
Metal discs for pet collars have a diameter of 4cm. Each disc is 0.1cm thick. How many discs can be made from 1000cm3 of metal?
October 14, 2010 by Anonymous

chemistry
An electric range burner weighing 614 grams is turned off after reaching a temperature of 499.0oC, and is allowed to cool down to 22.2oC. Calculate the specific heat of the burner if all the heat evolved from the burner is used to heat 565 grams of water from 22.2oC to 80.9oC.
January 25, 2012 by jayla

STAT
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 15 and a sample standard deviation 6 and a sample size of 18. Machine 2 has a sample mean of 12 and a sample standard deviation of 6 with a sample size of 18. With an...
October 4, 2013 by Tammy

Temperature(Math)
At 5 o'clock in the morning, the temperature at the top of the race course was -13o. By 10:00 A.M., it was +12o. How much had the temperature risen? Answer: 25o The temperature rose from -12o to +23o by noon. How much did the temperature change? Answer: 11o In the afternoon, ...
January 26, 2012 by Andrew

Chemistry
Constant-volume calorimeters are sometimes calibrated by running a combustion reaction of known ΔE and measuring the change in temperature. For example, the combustion energy of glucose is 15.57 kJ/g. When a 2.500 g sample of glucose burns in a constant volume calorimeter...
October 23, 2014 by Kales

Chemistry
A sample of KHC2O4 weighing 0.5839 g is dissolved in 25 mL of water and an endpoint is reached when 31.99 mL of KOH has been added. Calculate the molarity of the KOH solution. KHC2O4(aq) + KOH(aq) K2C2O4(aq) + H2O(l) because the coefficents are all the same, i just assumed ...
January 9, 2008 by Andrew

Chemistry
An unknown metal with a mass of 313 g has a heat capacity of 121 J/oC. What is the specific heat of the metal?
July 14, 2014 by Mike

Algebra (math)
The temperature outside was 72 degrees at 6 am. The temperature rose 4 degrees per hour for the next 12 hours. The total temperature is a function of the number of hours the temperature rose. What was the temperature at noon?
November 20, 2013 by Cristian

Chemistry
1. A student uses 6M HCl solution contaminated with Al(NO3)3 to wash the nichrome wire in between recordings of emission spectra for the different known and unknown metal ion solutions. The emission energies for the aluminum are 3.90x10^-19 J/atom, 3.58x10^-19 J/atom, and 2....
February 16, 2014 by Sandy

chemistry
you have a metal tank containing 74.0moles of nitrogen gas at a pressure of 15.0atm.If the pressure is measured at a temperature of 20.0c,then the volume of the tank must be how many liters(Round answer to one decimal place.
February 12, 2014 by gloria

Chemistry
mass of empty flask with stopper = 32.634 g mass of flask with water and stopper = 59.479 g density of the water = 0.9973 g/cm^3 mass of water = 26.845 g volume of water = 26.918 cm^3 the flask is then emptied and an unknown substance is added mass of flask with new liquid and...
October 16, 2007 by Vanessa

Chem hw!
1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas at 759 mm Hg pressure ...
March 11, 2010 by Teisha

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