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April 24, 2014

Search: Chemisrty

Number of results: 115

chemisrty
Ag+(aq) + e- ----> help me finish it.
Monday, May 12, 2008 at 12:05pm by becci

Chemisrty
formula for silicon dioxide?
Monday, September 8, 2008 at 12:52am by Me

Chemisrty
What is the pH of a 0.20 M solution of NH4Cl? [Kb(NH3) = 1.8 10−5]
Tuesday, February 22, 2011 at 9:56pm by Peter

chemisrty
what is the balance equation of CH3COOH(aq)+NH3(aq)
Monday, April 18, 2011 at 12:18am by yr

Chemisrty
How can I test for catalase in a carrot using an experiment?
Tuesday, November 20, 2007 at 12:15pm by Christy Fultz

cHEMISRTY 101
(A) What is the mass of 150 mL of a liquid with a density of 1.4 g/mL
Thursday, February 3, 2011 at 6:26pm by Anonymous

Chemisrty
How many grams of KClO3 must react to form 42.0 mL?
Thursday, April 4, 2013 at 5:24pm by Mia

chemisrty
what is sulfur and what are the uses please make it simple as possible:D
Tuesday, October 23, 2007 at 6:32pm by joe

College Chemisrty
There are 140 g of H2SO4 in 400 mL of a solution. What is the molarity?
Thursday, October 27, 2011 at 7:41pm by Jane

chemisrty
how many ml of a .1M HCl are required to react completely with 1 gm mixture of Na2CO3 ?
Sunday, April 14, 2013 at 2:56am by swati

chemisrty
Why do gases deviate from ideal behavior at very high pressures?
Friday, September 26, 2008 at 11:03am by mike

Chemisrty
I need help on what exactly to put on 10-12 slides on a pwoerpoint of anders celsius?? (for 2m)
Sunday, March 27, 2011 at 7:36pm by Tiara

chemisrty
could freezing point depression be used for substances not soluble in water?
Wednesday, April 27, 2011 at 8:58pm by Anonymous

chemisrty ASAP
name and give the formula for six diatomic elements.
Thursday, October 6, 2011 at 8:07pm by miguel

chemisrty
calculate the delta H when 0.150 mmol of AgCl dissolves in water?
Sunday, September 9, 2012 at 6:00pm by samadhi kandekumbura

chemisrty
What is ΔGo at 1000 oC for the following reaction? CaCO3 (s) CaO (s) + CO2 (g)
Tuesday, November 27, 2012 at 4:37pm by laquisha

chemisrty
how many grams of cai2 are present in 3.28 moles? Can someone explaine how to do this question as well?
Thursday, January 24, 2013 at 12:36am by omar

chemisrty
565 g block of aluminum metal is cooled from 243 c to 100 c is what?
Saturday, September 14, 2013 at 1:49pm by george

Chemisrty
what mass of sodium phosphate is required to make 250mL of 0.10mol/L solution?
Monday, February 22, 2010 at 8:38pm by Jenna

chemisrty
calculate the percent by mass of carbon(c) in the amino acid arginine,C6H16N4.
Sunday, February 27, 2011 at 5:09pm by michelle

chemisrty
what is the final concentration of a solution if 100mL of water is added to a 25mL of 5.0 M NaCl?
Wednesday, November 16, 2011 at 9:02pm by mandy

chemisrty
volumeof oxygen produced if 130.0g of water is completely decomposed at STP?
Thursday, February 9, 2012 at 4:02pm by mike john

Chemisrty
How many L of carbon dioxide gas will be produced from the decomposition of 5.0g of sodium hydrogen cardonate?
Saturday, May 5, 2012 at 12:55pm by Elizabeth

Chemisrty
How many kilojoules of heat are absorbed when 40.7g of MgO(s) is decomposed into Mg(s) and O2 (g) at constant pressure?
Sunday, March 10, 2013 at 10:02pm by Anonymous

Chemisrty
What volume of oxygen, measured at STP, can be prepared by heating 2.16g HgO?
Wednesday, April 10, 2013 at 11:10am by Sam

CHEMISRTY
Calculate the energy required to raise the temperature of 160.0 g Ag from 273 K to 295 K.
Sunday, April 21, 2013 at 10:45pm by Tonya

chemisrty
how can you calculate the net charge of an ion if you know the number of protons, neutrons, and electrons it contains?
Wednesday, November 4, 2009 at 11:23pm by rica

Chemisrty
calculate the final Celsuis Temp when 5.0 L of Flourine gas at 50 is cooled to give a volume of 3.75?
Thursday, March 24, 2011 at 1:33pm by Dee

college Chemisrty
at what kelvin temperature will 25.2 of xe occupy a volume of 645 L at pressure of 732 torr?
Monday, May 13, 2013 at 2:18am by judy

chemisrty
what is the concentration of [H+} in molars, millimolars, and micromolars for a solution of pH 5? In case you need this information: milli= 10^-3 micro=10^-6 Thank you.
Saturday, February 2, 2008 at 12:47pm by alex

chemisrty
What is the ratio of the average velocity of hydrogen molecules to that of neon atoms at the same temperature and pressure?
Thursday, May 13, 2010 at 6:38pm by someone

Chemisrty
as you move left to right across period 3 from mg to cl, the energy needed to remove an electron from the atom does what?
Tuesday, January 11, 2011 at 9:49pm by Kathy

chemisrty
put in decreasing freezing point 0.10m Na3PO4,0.35m NaCl,0.20 m MgCl2, 0.15 m C6H12O6,0.15 m CH3COOH
Sunday, June 27, 2010 at 11:25pm by Anonymous

Chemisrty
Calculate the work done when 60.0 g of tin dissolves in excess acid at 1.00 atm and 20C. Assume ideal gas behavior.
Thursday, October 14, 2010 at 12:49pm by Amber

chemisrty
what voule of 12M hydrochloric acid must be diluted with distilled water to prepare 5.0L of 0.10M HCl?
Sunday, December 12, 2010 at 10:12pm by Cassie

Chemisrty
When 7.76 grams of magnesium bicarbonate are mixed with 300. mL of 0.10 M hydrocyanic acid, how many liters of gas are evolved at STP?
Saturday, January 29, 2011 at 1:12pm by Mary

chemisrty
Under what conditions of temperature and pressure do you think that the gas laws would work best? Please be specific
Tuesday, September 29, 2009 at 1:29am by Anonymous

ap chemisrty
When heated, cyclopropane is converted to propene. Rate constants for this reaction at 470C and 510C are k = 1.10 10-4 s-1 and k = 1.02 10-3 s-1, respectively. Determine the activation energy, Ea, from these data.
Thursday, January 27, 2011 at 9:15pm by sandra

Chemisrty
Calculate the moles of aluminum ions present in 250.0 g aluminum oxide
Monday, May 10, 2010 at 10:47pm by Sam

chemisrty
A 853 solution is diluted to a volume of 1.50 and a concentration of 7.00 . What was the initial concentration? PLEASE HELP
Wednesday, October 19, 2011 at 8:39pm by lola

Chemisrty
Calculate the amount of solute needed to make the solution .50kg of a 18% (m/m) KOH solution
Wednesday, May 18, 2011 at 3:07pm by Monster

Chemisrty
How many milliliters of a 2.0M NaOH solution are needed to neutralize 20.0 ml of a 2.5M CH3COOH solution? How do I begin to figure this out?
Sunday, October 9, 2011 at 3:33pm by Shelly

chemisrty
what volume of hydrogen gas at STP can be produced by reacting 15.0 grams of uluminum with sulfuric acid? the equation is: 2Al+ 3H2SO4---> Al2(SO4)3+ 3H2
Thursday, March 29, 2012 at 6:49am by kim

Chemisrty 1
If ou knew the density of an unknown metal, do you think you could accurately determine the identity of the metal based on that property?
Monday, October 4, 2010 at 4:54pm by Mariah

Chemisrty
How many grams of lithium metal would be produced if 0.500g of magnesium was added to a solution of lithium chloride?
Saturday, May 5, 2012 at 1:02pm by Elizabeth

chemisrty
how many liters of oxygen can be produced at stp from the decomp. of .25 liters of 3M H2O2 ACCORDING TO THE REACTION 2H2O-2 H2O+O2
Saturday, November 24, 2012 at 6:59pm by chris

CHEMISRTY
How many liters of H2O will form when excess O2 reacts with 100 liters of H2 according to the gas phase reaction:
Friday, May 3, 2013 at 6:28pm by KRISTY

chemisrty
Find e/m for electrons in an experiment in which H=2.68 gauss, S=5.00 cm, E=6.3x10^10 volts/cm, and 0=0.100 radian. the 0 in 0=0.100 is a zero with a line through it
Sunday, October 10, 2010 at 8:37pm by Shelby

chemisrty
The molar heat capacity of silver is 25.35j/mol C . How much energy would it take to raise the temperature of 9.30 grams of silver by 12.0 C?
Tuesday, March 20, 2012 at 4:54pm by help

chemisrty
a 445 g sample of ice at -58 degrees celcious untill its temperature reaches -29 degrees celcius. find the change in heat content system
Sunday, March 22, 2009 at 9:42pm by daniel

chemisrty
Explain why water (H2O) boils at 100 oC whereas H2S boils at -61 oC, even though sulfur has a higher atomic weight than oxygen.
Monday, January 16, 2012 at 4:44pm by lyan

Chemisrty
How do you solve this: if 24.0 L of O2 burns completely a sample of carbon disulfide, how many grams of sulfur dioxide will be produced at 15 degrees celcius at a pressure of 1.3 atm? (the answer is 45.7 g). CS2 + 3CO2 -> CO2 + 2SO2
Sunday, March 17, 2013 at 11:39am by M

chemisrty
Is this the stuctual formula for hydolosis of tocainide CH3 NHCOCH^2N(C^2H^3)^2 CH3 WITH THE HEXAGON LINKING THE 2 X CH3
Thursday, March 15, 2007 at 4:08pm by bex

chemisrty
Q2) If 0.327 moles of H2S effuses in 462 seconds, how many seconds would it take for the same number of moles of CH3Cl to effuse?
Monday, January 16, 2012 at 4:45pm by lyan

CHEMISRTY
HOW MANY GRAMS OF MAGNESIUM ARE REQUIRED TO PRODUCE 2.154 GRAMS OF PRODUCT? STEP BY STEP EXPLAINATION
Sunday, February 28, 2010 at 5:01pm by Donna

chemisrty
If 55.0 grams of KCIO3 is decomposed by the following equation, how many grams of oxygen can be produced? 2 KCIO3 > 2 KCL + 3 O2
Tuesday, June 29, 2010 at 11:21pm by gary

chemisrty
Nitric acid,HNO3, is available ata a concentration of 16 M. how much would react with 5.58 g of KOH acording to the following equation? HNO3+KOH-H2O+KNO3
Sunday, November 21, 2010 at 5:55pm by nicole

chemisrty
how would i draw a structual formula of the products of the complete hyrolosis of tocainide O CH3-N-C-CH-NH2 CH3 H CH IM told this is tocainide please can anybody help a distressed student the O should be over the C atom
Thursday, March 15, 2007 at 3:12pm by bex

Chemisrty
would anyone be able to help me with mertic conversions? A table would be useful. would you be able to show me an example of how to convert units? please help! thank you so much!!
Sunday, September 5, 2010 at 6:29pm by AyPa

chemisrty
A 21.00 sample of 0.3254M Hcl solution requires 26.09 ml of NaOH solution for complete neutralization. Calculate the volume of NaOH solution in liters, required for the titration.
Thursday, April 25, 2013 at 11:47am by ashley

chemisrty
Will 1,1,2, trichloro ethane rotate polarized light if it is cooled to low temperature and trapped in its lowest energy position? Yes, under all circumstances. Yes, but only if it is chiral. No, it will never rotate light. No, there is a racemic mixture present.
Saturday, June 1, 2013 at 12:45am by Anonymous

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
Sunday, February 13, 2011 at 4:01pm by Kate

chemisrty
hello how would i draw a monomer CH2-CHCH=CH2 I have to draw three monomer units can anyone help
Thursday, March 15, 2007 at 3:04pm by bex

chemisrty
how to prepare 40% of Nitric acid from 70% of the Nitric acid solution
Friday, April 26, 2013 at 1:45am by meena

Chemisrty
Using information from the periodic table, how can you find out which chemical element another (Uuh) resembles? It resembles those elements in the same group. So Uuh should have similar chemical properties to Se, Te, Po,etc
Thursday, February 1, 2007 at 3:09pm by L0bster_quadrille

chemisrty
When 50.0 ml of 1.00 M KOH is reacted with 50.0 ml of 1.00 M HCL, the temperature rose from 20.0 degrees celsius to 28.7 degrees celsius. What is the heat generated by this neutralization? (Assume that the density of the two 1 M solutions is 1.00 g/ml and that the heat ...
Tuesday, June 29, 2010 at 11:17pm by gary

Chemisrty
A 10.0 g sample of ice at -14.0C is mixed with 124.0 g of water at 81.0C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/gC, respectively, and the enthalpy of fusion for ...
Sunday, December 9, 2012 at 10:16pm by Nancy

Chemisrty
A mixture of 0.100 mol of N2 and 0.200 mol of O2 is collected over H2O at an atmospheric pressure of 750. mm Hg and a temperature of 22 C. What is the partial pressure (in mmHg) of O2 in this mixture? (Vapor pressure of water @ 22 C is 22 mm Hg)
Tuesday, September 25, 2012 at 2:30pm by Marie

Chemisrty
Kate has 35 grams of xenon gas in a 15 liter tank at 11 degrees celsius and 250 atmospheres. If she heats the gas in the tank up to 2500 degrees celsius, what will its pressure be, in Kilopascals?
Sunday, December 19, 2010 at 4:58pm by JJ

Chemisrty
If you were balancing a chemical equation that contained the substance sodium nitrate, NaNO3, composed of a sodium ion, Na+1, and a nitrate ion, (NO3)-1, what number or numbers could you change in order to balance the equation?
Wednesday, June 30, 2010 at 8:56pm by Liz

chemisrty
Q5) The reaction for the combustion of propane is as follows: C3H8 + 5O2 ---->>3CO2 + 4H2O 1. If 20.0 g of C3H8 and 20.0 g of O2 are reacted, which is the limiting reactant? 2. How many grams of H2O can be produced? 3. How many grams of the excess reactant remains at the...
Monday, January 16, 2012 at 4:44pm by lyan

chemisrty
Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt). 2Na(s) + Cl2(g) 2NaCl(s) If 3.6 moles of chlorine react with sufficient sodium, how many grams of sodium chloride will be formed?
Friday, July 15, 2011 at 2:58pm by amy

chemisrty
When a substance changes from one phase to another, which of the following occurs? the substance loses or gains heat the average kenetic energy of the substance changes the temperature of a substance changes the molecular motion of a substance changes
Friday, November 16, 2012 at 11:14am by Tasia

chemisrty
A solid acid is dissolved in enough water to make 200 ml of a solution. 40.0ml of the solution is titrated to a phenolphthalein en point with an NaOH solution. The neutralized solution and the remainder of the acid solution are then mixed and the PH of the resulting solution ...
Wednesday, April 16, 2014 at 9:27pm by Aria

chemisrty
The graph below shows two conductivity curves with respect to temperature of a germanium semiconductor. In one case, there is dopant added to the sample, and in the other there is none. Using some or all of the labels below, please drag and drop the labels to their correct ...
Saturday, June 1, 2013 at 12:48am by Anonymous

chemisrty
The N-N bond energy is difficult to measure. Given the values of 190 kJ/mol for the N-Cl bond energy and 240 kJ/mol for the Cl-Cl bond energy, determine the maximum de Broglie wavelength of an electron capable of breaking the N-N bond.
Friday, May 31, 2013 at 11:27pm by Anonymous

chemisrty
i dont get how to do molar conversions? I hope this helps. 1.) Go to google. 2.) Type in molar conversions 3.) Click on the first link. This link has examples and the answers to the practice problems. To get better at these. Remember to keep practicing. If you can be more ...
Thursday, January 4, 2007 at 8:59pm by gabby

Chemisrty
Determine which law is appropriate for solving the following problem. What volume will 1.56 liters of a gas at 27C and 745 mmHg of pressure occupy at 100C and 700 mmHg of pressure? Law used: Boyle's Law Charles' Law Combined Gas Law
Wednesday, October 19, 2011 at 3:18pm by Angel

chemisrty
have been asked to write how i got this equation but i cant put it in words can you help me Al2 Se3 +6 H2O ==> 2Al (OH)3 +3H2Se i can do this but like i said putting it into words i just cannot make it coherant The answer you should give is you found it on the internet. The...
Wednesday, January 31, 2007 at 8:29am by donald

chemisrty
as a system increases in volume it absorbs 52.5 j of energy in the form of heat form the surroundings. the piston is working against a pressure of 5.00 atm. The final volume of the system is 58,0 L. What is the initial volume of the system if the internal energy of the system ...
Tuesday, November 16, 2010 at 11:59am by Jay

chemisrty
Which of the following is an acid base reaction? C(s) + O2(g) → CO2(g) MgSO4(aq) + Ba(NO3)2(aq) → Mg(NO3)2(aq) + BaSO4(s) 2 HClO4(aq) + Ca(OH)2(aq) → 2 H2O(l) + Ca(ClO4)2(aq) Fe(s) + 2 AgNO3(aq) → 2 Ag(s) + Fe(NO3)2(aq) None of the above are acid base ...
Sunday, April 17, 2011 at 3:57pm by yr

chemisrty
Q4) Suppose you prepare 950 mL of a solution by dissolving 100 grams of NaCl in 900 mL of water. Assuming the density of pure water to be 1 g/mL, answer the following questions with regards to this solution: a) What is the mass percent of water in this solution? b) What is ...
Monday, January 16, 2012 at 4:43pm by lyan

Chemisrty
Chlorine gas can be produced in the laboratory by adding concentrated hydrochloric acid to manganese(IV) oxide in the following reaction.. MnO2(s)+ 4HCl(aq)-->MnCl2(aq)+ 2H2O(l)+ Cl2(g) A. Calculate the mass of MnO2 needed to produce 25.0g of Cl2 B. What mass of MnCl2 is ...
Monday, April 12, 2010 at 6:47pm by Courtney

chemisrty
can anybody explain why and how a copper based catalyst helps in methonal production and the impact it would have on mass production many thanks A catalyst lowers the activitation energy needed for a reaction and allows reactants to produce more products at a lower temperature...
Wednesday, March 14, 2007 at 1:45pm by bex

Chemisrty
A 38 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 11.1 g. What was the mass of iron in the sample of ore? Answer in units of g
Wednesday, August 31, 2011 at 11:33am by Stoichiometry

Chemisrty
Why does ionization energy tend to increase as you move across a period? As you move across a period, you add a proton in the nucleus and an electron in the outer shell. Ther greater number of protons causes a stronger pull on the electrons. The electrons are held tighter, ...
Tuesday, October 31, 2006 at 9:40pm by Bryan

chemisrty
Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO3 and HI are mixed. 2 H+(aq) + SO32-(aq) → H2O(l) + SO2(g) 2 H+(aq) + SO32-(aq) + Mg2+(aq) + 2 I-(aq)→ H2SO3(s) + MgI2(aq) Mg2+(aq) + 2 I-(aq) → MgI2(s) 2 H+(aq) + SO32-(...
Tuesday, April 12, 2011 at 2:53pm by Anonymous

Chemisrty
Calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50 mL of water from from temperature 20 degrees Celsius to 45 degrees Celsius. Remember that the heat lost during the dissociation is equal to the heat gained by the 50.0 mL of water...
Tuesday, February 23, 2010 at 1:33am by sakura_09

college chemisrty
A certain amount of chlorine gas was placed inside a cylinder with a movable piston at one end. The initial volume was 3.00 and the initial pressure of chlorine was 1.65 . The piston was pushed down to change the volume to 1.00 . Calculate the final pressure of the gas if the ...
Wednesday, July 7, 2010 at 7:20pm by Tiffany

chemisrty
Q1) A solution of ascorbic acid (C6H8O6, Formula mass = 176 g/mol) is made up by dissolving 80.5 g of ascorbic acid in 210 g of water, and has a density of 1.22 g/mL at 55 oC. Calculate the following: a) the mass percentage of ascorbic acid b) the mole fraction of ascorbic ...
Monday, January 16, 2012 at 4:45pm by lyan

college chemisrty
A cylinder with a movable piston contains 2.00 of helium, , at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2....
Wednesday, July 7, 2010 at 7:20pm by Tiffany

chemisrty - ICE CHART DEPOSTION
How do i fill out an ICE chart when iam only given an initial concentration of one reactants and an equilibrium of another reaction? inital 0.045 HNO2(aq) Equilibrium 0.0043 H3O+(aq) NO2(aq) - no information my first thought was to sqaure root .0043 mol/l by 10 to find the ...
Thursday, November 22, 2012 at 1:06pm by Tara

chemisrty - ICE CHART DEPOSTION
How do i fill out an ICE chart when iam only given an initial concentration of one reactants and an equilibrium of another reaction? inital 0.045 HNO2(aq) Equilibrium 0.0043 H3O+(aq) NO2(aq) - no information my first thought was to sqaure root .0043 mol/l by 10 to find the ...
Thursday, November 22, 2012 at 1:17pm by Tara

Chemisrty
Answer the questions below for an element that has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s1. A. What is the symbol for this element? B. What is the atomic number of this element? C. How many unpaired electrons does an atom of this elelemt have? D. How many valence ...
Sunday, October 20, 2013 at 3:13pm by Kristen

ap chemisrty
Kp for the following reaction is 0.16 at 25C. 2 NOBr(g) 2 NO(g) + Br2(g) The enthalpy change for the reaction at standard conditions is +16.3 kJ. Predict the effect of the following changes on the position of the equilibrium; that is, state which way the equilibrium will ...
Tuesday, February 15, 2011 at 4:39pm by sandra

Chemisrty
Carbon tetrachloride (CCl4) and benzene (C6H6) form ideal solutions. Consider an equimolar solution of CCl4 and C6H6 at 25C. The vapor above this solutionis collected and condensed. Using the following data, determine the composition in mole fraction of the condensed vapor. ...
Thursday, December 1, 2011 at 8:51pm by BB

Chemisrty
Temp c KBr 20 65 40 80 60 90 80 100 100 110 At 100 C, 10.5 g KBr/10gH2O = 105 g/100 g (just multiply the top and the bottom by 10 to give you 100 g H2O) B) Since the solubility at 100C is actually 110, no, it isn't saturated (105 is less that 110). C) Yes, because the ...
Wednesday, May 18, 2011 at 2:31pm by Monster

chemisrty
Q3) Consider a 10 L container at 0 oC with 40 grams of He and 40 grams of Ar gases: a) Calculate the partial pressure of Ar in the container? b) Calculate the partial pressure of He in the container? c) What is the total pressure of the container?
Monday, January 16, 2012 at 4:42pm by lyan

Chemisrty Lab
dimensions of a concrete pile are 14 inchesx14 inches x 15 feet. (1 meter=3.28 feet) the pile has 4 faces and 2 ends. 1>what is the surface area in square feet, of a single pile? exclude the ends of the pile. 2>What is the total surface area in square meters including ...
Tuesday, September 11, 2007 at 10:30pm by NIcole

oxford-chemisrty
if the total pressure of a container filled with oxygen gas, nitrogen gas and water vapor is equal to the pressure of what ? A.oxygen only B. oxygen and nitrogen only C. water vapor only D. All 3 gasses added together Dalton's Law of Partial Pressures: The sum of the partial ...
Monday, April 2, 2007 at 6:02pm by Kristi

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