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March 29, 2017

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Number of results: 57,081

chemistry
When 34.1 g of lead reacts with 6.81 L of oxygen gas, measured at 1.00 atm and 25.0°C, 36.1 kJ of heat is released at constant pressure. What is DH° for this reaction?
October 5, 2014 by george

chemistry
In a soda acid fire extinguisher, concentrated sulfuric acid reacts with sodium hydrogen carbonate to produce carbon dioxide, sodium sulfate and water. How many moles of sodium hydrogen carbonate are produced from a reaction of 0.4 moles of sulfuric acid? Write the balanced ...
January 19, 2015 by student_14579

science
Consider a 1.50-g mixture of magnesium nitrate and magnesium chloride.After dissolving this mixture in water,0.500M silver nitrate is added dropwise until precipitate formation is complete. THe mass of the white precipitate formed is 0.641 g. a)Calculate the mass percent of ...
January 2, 2008 by Brianna

chem
You mix 5.32 g of solid magnesium sulfate with 105.24 g of water inside a calorimeter. As the magnesium sulfate dissolves, the temperature of the solution rises from 24.5°C to 30.1°C. Calculate the amount of energy in kJ that was transferred into the surroundings through ...
November 11, 2015 by Anonymous

Chemistry , please !
when 21g of magnesium carbonate was heated , magnesium oxide produced . carbon dioxide also released. what is the volume of carbon dioxide released ?
June 5, 2012 by Ikram

Chemistry
The equilibrium constant Kc for the following reaction is equal to 0.20 at 250°C. Calculate the equilibrium constant Kp for the reverse reaction at the same temperature. COCl2 (g) = CO (g) + Cl2 (g) I'm sorry.. English is a second language for me. After solving for K'c and ...
March 15, 2012 by David

Chemistry
Lead can be extracted from lead(II) sulfide, PbS, in two stages. Stage 1: Lead(II) sulfide is heated in air. It reacts with oxygen to produce lead(II) oxide and sulfur dioxide. Stage 2: The Lead(II) oxide is then heated in a blast furnace with coke. (a) Write a chemical ...
April 22, 2013 by Qindan

Chemistry
If a precipitation reaction occurs when a solution of one species is added to a solution of the other, enter the formulas and states of all products. Separate by comma. If there is no reaction, enter the formula and state of all ions in solution. CoCl2(aq) + NaOH(aq) →
November 23, 2010 by Amrita

Physical Science
why does the maximum initial reaction rate cannot be reached at low substrate concentrations.
August 1, 2011 by Ron

physical science
A substance whose 0xidation number decreases during a chemical reaction
October 28, 2012 by sthabiso

Physical science
What did svante arrhenius discover about the reaction between an Acid and a Base?
August 22, 2014 by Siphelele

Chemistry
Rates of reaction, redox reactions? 10 points? An structural isomer of bromobutane (C4H9Br) can be hydrolysed using aqueous sodium hydroxide to produce butanol. This can be represented by the following equation: C4H9Br(l) + OH-(aq) > C4H9OH(l) + Br-(aq) This reaction was ...
March 30, 2012 by Local

CHemistry
The first step of the synthesis is described by the reaction below. When 1.200 g of Fe(NH4)2(SO4)2 6H2O is mixed with 13 mL of 1.0 M H2C2O4, the theoretical yield of FeC2O42H2O is ? grams im not sure what to do. do u convert 1.0M to grams first? by multiplying .013 L thx First...
April 22, 2007 by Jason

American Government
1. Justice Stephen Breyer stated, “people need to understand the importance of the Court as an institution, even though the Court’s decisions may at times be unpopular and possibly wrong,” Explain how this statement relates to the concepts of “Judicial Independence” ...
April 17, 2012 by Jessica

chemistry
The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 C is 410 s, what is the value of the rate constant k? If the initial concentration of dinitrogen pentoxide in an expt at 55 ...
March 11, 2009 by jen

chemistry
Write down a balanced acid-base reaction given the following reactants Reactants: NaOH(aq) + HCl(aq)
February 10, 2011 by jonh

Chemistry 104 PLEASE HELP ME!!
Calculate Eo (reduction potential) for the following balanced reaction. NiO2 + 2H2O + 2Fe(OH)2 Ni(OH)2 + 2Fe(OH)3
May 3, 2013 by Sophie

Gr.11 Chemistry
Is this right? Balanced: 3 Mg(s) + 2 Al(NO3)3(aq) = 2 Al(s) + 3 Mg(NO3)2(aq) Total Ionic Equation: 3 Mg(s) + 2 Al +3 (aq) + 6NO3 -1 (aq) = 2 Al(s) + 3 Mg+2 (aq) + 6NO3 -1 (aq) Net Equation : 3 Mg(s) + 2 Al +3 (aq) = 2 Al(s) + 3 Mg+2 (aq)
March 17, 2011 by Kwan

chemistry
Based on the balanced equation 2I2O5 + 10NO → 5N2O4 + 2I2 calculate the number of excess reagent units remaining when 188 I2O5 molecules and 850 NO molecules react? do i start with a new balance equation in order to solve it
February 10, 2010 by eng

physical science
1. Boyle’s law states that if you squeeze a fixed amount of a gas into a smaller volume, the pressure will increase. Explain why in your own words.
March 3, 2013 by alex

chemistry
2C3H6(g) + 2NH3(g) + 3O2(g) -> 2C3H3N(g) + 6H2O(g) A 150.0 liter steel reactor at 25 ºC is filled with the following partial pressures of reactants: 0.500 MPa C3H6, 0.800 MPa ammonia, and 1.500 MPa oxygen gas. If the reaction proceeds to 90% yield, and no side reactions ...
March 18, 2014 by keitanako

general chemistry
. The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 °C is 410 s, what is the value of the rate constant k? If the initial concentration of dinitrogen pentoxide in an expt at...
October 22, 2009 by susie

general chemistry
. The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 °C is 410 s, what is the value of the rate constant k? If the initial concentration of dinitrogen pentoxide in an expt at...
October 22, 2009 by susie

Chemistry
Is there a reaction between CuSO4 + KI? When I performed the reaction, a brown and yellow color was formed but when I wrote out the molecular equation, I did not find a precipitate or gas evolution.
February 22, 2009 by Caileen

Chemistry
Is there a reaction between CuSO4 + KI? When I performed the reaction, a brown and yellow color was formed but when I wrote out the molecular equation, I did not find a precipitate or gas evolution.
February 22, 2009 by Caileen

Chemistry
Is there a reaction between CuSO4 + KI? When I performed the reaction, a brown and yellow color was formed but when I wrote out the molecular equation, I did not find a precipitate or gas evolution.
February 22, 2009 by Caileen

Please help!! Chemistry
Ethanol is produced by the action of yeast (catalyst) on sugar cane juice. (1).What is specific name of this reaction? (2.) Write a simple word equation of this reaction.
August 25, 2012 by Jeconiah

Please help!! Chemistry
Ethanol is produced by the action of yeast (catalyst) on sugar cane juice. (1).What is specific name of this reaction? (2.) Write a simple word equation of this reaction.
August 25, 2012 by Jeconiah

Chemistry
in a particular redox reaction, MnO2 is oxidized to MnO4– and fe3+ is reduced to fe2+. Complete and balance the equation for this reaction in acidic solution. Phases are optional.
November 21, 2014 by lori

Chemistry
Given a 10.0g sample of MgCO3*5H2O, what weight of anhydrous magnesium carbonate can be obtained after driving off the water? The GFM of the sample is 174.3amu. Now.. how do I go about finding the weight of the magnesium carbonate?
November 9, 2009 by c

Chemistry
For every liter of sea water that evaporates, 3.70g of magnesium hydroxide are produced. How many liters of sea water must evaporate to produce 5.00 moles of magnesium hydroxide? Please show and explain all steps! Thank you!
September 29, 2010 by Jack

Chemistry
An antacid tablet containing magnesium hydroxide instead of calcium carbonate was dissolved in 100.0 mL of 0.2893 M HCL. 10 mL of this solutions was titrated to endpoint with 25.20 mL of 0.1007 M NaOH. How much magnesium hydroxide was in the antacid tablet(in mg)? Any help is ...
May 7, 2013 by Mindy

Physical Chemistry
When the reaction glucose-1-phosphate (aq) --> glucose-6-phosphate (aq) is at equilibrium at 25.0 degrees celcius, the amount of glucose-6-phosphate present is 95% of the total. A.) Calculate the Standard Delta G at 25.0 degrees celcius. B.) Calculate Delta G for the ...
October 20, 2006 by Angela

Algebra I
Write an equation based on the given facts and find the solution. Show all your work, including the steps for solving the equation and checking your answer. –2 times a number plus 12 is –110. Find the number.
May 31, 2012 by Kasey

chem
a soln. that is .195 M in CH3NH2 and .105 M in CH3NH3Br what is the balanced equation for this ? How do you know ?
March 8, 2009 by natash

Chemistry
What is the balanced chemical equation for neutraling chlorine with sodium thiosulfate
May 4, 2009 by Crista

chemistry
Why must a balanced chemical equation be used when determining Keq?
June 3, 2009 by kelly

Chemistry
What is the balanced ionic equation between bromine and sodium bisulfite??? thanks
March 1, 2010 by niki

chemistry 1
what is the value of the coefficient for cobalt when the following equation is balanced Co(s)+ O2 (g)> Co2O3(s)
March 5, 2010 by jeanette

Chemistry
Have I balanced this equation correctly CN + NaOCL---OCN + NaCl
April 6, 2010 by Mel

chemistry
Why must a balanced chemical equation be used when determining Keq?
May 25, 2010 by sara johnson

chemistry
CuCl2(aq) and Na2CO3(aq) are mixed.Write the balanced equation for the process.
October 20, 2010 by Bonnie

Chemistry
When NiCl2.6H2O dissolves in water, what does it form (i.e. balanced equation)?
March 7, 2011 by John

chemistry
give a balanced equation between phosperuos and sodium hydroxide
August 22, 2011 by wane

Chemistry
Write a balanced equation for copper oxide + Ethanoic Acid
October 2, 2011 by Eloise

Organic Chem
Write the balanced equation for dibenzalacetone and benzoic acid
October 10, 2011 by Ruth

chemistry
What is the balanced equation for 0.60M Phosphoric acid and 1.85M NaOH?
January 24, 2012 by Alexis

Chemistry
What is the full balanced equation?? Hg2(NO3)2(aq) + HBr(aq) → ?
January 26, 2012 by Shea

chemistry
From the balanced equation for tums and .0072mL calculate no. moles titrated.
February 9, 2012 by Everett

Chemistry
NaCl+H2SO4 Write the balanced net ionic equation.
February 17, 2012 by Alex

Chemistry
NaBr+H2SO4 Write the balanced net ionic equation.
February 17, 2012 by Alex

chemistry
KI+H2SO4+KIO3 Write the balanced net ionic equation.
February 18, 2012 by Greg

chemstry
when the equation is balanced, the lowest whole number coffinent for hydrogen is?
December 12, 2012 by los

chemistry
What are the steps in finding the balanced equation for the complete combustion of benzene?
December 13, 2012 by Morgan

chemistry
what is the word and balanced chemical equation for oxalic acid and marble?
April 18, 2013 by sarah

chemistry
What is the balanced chemical equation Shampoo? please i need a help ASAP!
November 26, 2014 by krisha

chemistry
When the following equation is balanced, what is the coefficient for Ta? H2 + Ta2O3 → Ta + H2O
December 6, 2014 by Taylor

science
what is the balanced chemical equation for (NH4)2SO4 + CuSO4.5H2O?
March 1, 2015 by Bonga

Chemistry
Balanced chemical equation for H2O + SO2 --> O3 + H2S + SO3?
April 24, 2016 by Name

chemistry
Write the balanced chemical equation for the oxidation of catechol to quinone.
October 4, 2016 by jack

chemistry
what volume of a 2.4 mol/L magnesium oxide solution contains 2.3 mol of magnesium oxide?
March 12, 2015 by sharon

chemistry
I cannot figure out how to work this stoichiometry problem with the given equation: Mg+2HCl-->MgCl2+H2 What volume of hydrogen is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl What do you not understand about it? It is a limiting reagent problem...
February 5, 2007 by Carter

chemistry
Doing review for an exam and I can't find how to do this problem in my notes. 2 SO2 + 2 Cl2 -----> 2 SOCl2 + O2 from a previous problem I solved: rate=k[SO2]^2[Cl2] k = 467.666666... or in sig. figs 467 Energy reaction: T= 25 C The activation energy (Ea) is 35.0kJ/mole ...
July 13, 2011 by energy diagram

chemistry
Doing review for an exam and I can't find how to do this problem in my notes. 2 SO2 + 2 Cl2 -----> 2 SOCl2 + O2 from a previous problem I solved: rate=k[SO2]^2[Cl2] k = 467.666666... or in sig. figs 467 Energy reaction: T= 25 C The activation energy (Ea) is 35.0kJ/mole ...
July 14, 2011 by energy diagram

Chemistry
I am not sure if I answered the question below correctly and if I need all the information in my answer. Do I need all of this information? Why does the simplest ketone have 3 carbon atoms and no less? The simplest ketone has three carbon atoms and no less because of the ...
February 16, 2008 by Megan

science
write word equations and balanced chemical equations for each of the following reactions: a)calcium bicarbonate reacts with hydrochloric acid. b)magnesium hydroxide reacts with hydrochloric acid. c)Aluminum hydroxide reacts with hydrochloric acid.
June 22, 2016 by Adivhaho

Physical anthropology
Chinese premoderns retain certain H. erectus trails including- A. extreme post orbital construction and sagittal crests B. projecting canines and diastemata C. sagittal ridges and flattened nasal bones D. All of the above
March 13, 2012 by Taylor

Intro to Physical Science
Define physical science Andrew: I went to www.dictionary.com and typed in physical science. The following is what it returned.I hope this helps. physical science  1. any of the natural sciences dealing with inanimate matter or with energy, as physics, chemistry, and ...
September 9, 2006 by andrew

chemistry help plz
if 4.55 g of sodium sulphide and 15.0 g of bismuth nitrate are dissolved in separate beakers of water which are then poured togehter, what is the maximum mass of bismuth sulphide an insoulble compound that could precipitate? Which reactant was the limitting reactant? Na2S + Bi...
January 8, 2010 by bobsley plz conform

Chemistry
When solutions of KCl and Pb(NO3)2 are mixed, a precipitate forms. Which of the following is the balanced equation for the double replacement reaction that occurs? a. KCl(aq) + Pb(NO3)2 (aq) ¨ KNO3 (aq) + PbCl2 (s) b. KNO3 (aq) + PbCl2 (s) ¨ KCl(aq) + Pb(NO3)2 (aq) c. K...
November 30, 2012 by Z

Chemistry
For the reaction: H2(g) + Cl2(g) ¨ HCl(g) (is this balanced?) calculate the mass, in grams of H2 needed to react with 25.0g Cl2. A. none of these B. 25.0 C. 0.711 D. 0.353
March 5, 2011 by Anthony

chemistry
What is the molar solubility of Sr3(AsO4)2 and the concentration of Sr^+2 and AsO4^-3 in a saturated solution at 25C? the Ksp is 1.3 E -18. Show the balanced reaction.
June 10, 2012 by Chloe

chemistry
Calculate the molarity if a Ba(OH)2 solution if a 37.25ml portion of this solution is neutralized by 45.00mL of 1.500M HCl. You will need the balanced reaction
March 14, 2014 by Anonymous

emily
some skin creams claim that they are "pH balanced" and yet do not have a pH of 7. what do they mean when they say pH balanced?
March 19, 2014 by please answer!! ASAP

Chemistry+Balancing equations
Aqueous magnesium hydroxide has been used for many uears because it reacts with HCL to produce magnesium chloride So far I got Mg(pos. 2 charge)OH2(-1 charge) + HCL >>>>>>> Mg(+2 charge)Cl2(-1 charge) + H2O did i get that rite?
February 3, 2009 by Chopsticks

chemistry
If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, 1.)what is the balanced equation for this reaction? 2.) what is the ...
April 13, 2014 by Alison

Social Studies
The Surpreme Court ruled that slaves were not citizens of the U.S. and had no rights. Answer:Dred Scott decision The number of slave states and free states was kept balanced when Missouri was allowed into the Untion as a slave state and Maine as a free state. Answer:Missouri ...
March 19, 2012 by Derrick

chemistry
If a precipitation reaction occurs when a solution of one species is added to a solution of the other, enter the formulas and states of all products. Separate by comma. If there is no reaction, enter the formula and state of all ions in solution. aluminum sulfate + lead(II) ...
November 23, 2010 by Amrita

chemistry
determine the mass of CO2 produced when 76.8g of CaO is reacted with 50.0 g of C acording to the unbalanced equation... CaO + C ==> CaC2 CO2 after i balanced the equation i got 2CaO +5C ==> 2CaC2 +CO2
March 22, 2011 by Anonymous

chemistry
an ezyme -catalysed reaction was carried out in a solution buffered with 0.05 M phosphate ph 7.2 . As a result of the reaction ,0.06M of acid was formed. (phosphoric acid has three pka values. The one required for this calculation is pka2=7.2). 1) what was the pH at the end of...
January 12, 2016 by josh

Chemistry
1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of solvent. 2. In ...
September 26, 2011 by Jack

chemistry
the thermal decompostion of 26.4g of CaCo3 produced10.6g calcium and 3.17g carbon. calculate the mass of oxygen produced in this reaction.
February 13, 2011 by Mary

chemistry
if 15 grams of ethane gas c2h6, reacts with 128 g oxygen un a combustion reaction, how many moles of water can be produced?
January 31, 2016 by jen

science
identify the type of reaction when hydrogen sulphide gas burns in oxygen to give water and sulphur dioxide
June 16, 2016 by shivani

Chemistry
For the reaction shown, calculate how many grams of oxygen form when each of the following completely reacts. 2HgO(s)→2Hg(l)+O2(g)
July 17, 2016 by Marley

chemistry
At 300.K and 1.00 atm, assume that 25 mL of NO gas reacts with 22 mL of oxygen gas and excess water to produce nitric acid according to the following equation: O (g) H O(l) 2 HNO (g) 2 2NO(g) 3 + 2 + 2 ⎯⎯→ 3 . If all of the nitric acid produced by this ...
March 21, 2010 by bob

physical chemistry
for this equation Fe(CN)6 4- + Fe 3+ --> Fe(CN)6 3- + Fe 2+ at 310 K and pH 2 using the equation E = Eo + 2.303 RT/nF log K - 2.303 pH RTh/nF what is h ?
February 16, 2010 by lucy

chemistry
Write a balanced equation for the neutralization of each of the following. Express your answer as a chemical equation. Identify all of the phases in your answer. Part A: H3PO4(aq) and NaOH(aq) Part B: Hl(aq) and LiOH(aq) Part C: HNO3(aq) and Ca(OH)2(aq
April 1, 2012 by Lisa

History
"Americans had decided how to rule their new territories. When the war with Spain began, the United States pledged to "leave the government and control of cuba to its people." In what way did the United States fail to keep the promise referred to in this quotation? A.The ...
February 27, 2017 by Babe

chemistry
Subject – equilibria Pure ethanoic acid (25.0cm3, CH3COOH), pure ethanol (35.0 cm3, C2H5OH) and pure water (20.0cm3, H2O) were mixed in a sealed flask at room temperature. The flask was placed in a heated water bath and maintained at 323K until equilibrium was established. ...
May 7, 2012 by yaya

Chemistry
Imagine that you have a 6.00L gas tank and a 3.00L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 125atm , to what pressure should you fill the...
May 1, 2015 by Anonymous

College Chemistry
Sulfur trioxide is made from the reaction of sulfur dioxide and oxygen. how many grams of SO3 can be made from the reaction of 1.91g SO2 with 1.29g O2? 2 SO2(g) + O2(g)---> 2SO3(g) a) 2.39g b) 3.20g c) 3.23g d) 4.77g e) 6.46g How would i solve this problem?? Im thinking i ...
May 4, 2010 by James

Chemistry II
17.5 mL of oxygen gas were collected at room temperature (22oC) and 100.2 kPa of atmospheric pressure. a) How many moles of oxygen gas were produced? b) What is the molar volume of the oxygen gas at the conditions in the laboratory?
September 14, 2009 by pasely

chemistry
A 36.1 mL sample of oxygen gas contains 0.529 mol of oxygen. If enough oxygen is added to the sample to obtain a volume of 50.5 mL, what must the final mass of the sample be? (The pressure and temperature is constant.)
September 29, 2014 by Br¥an

Chemistry
Chemistry HELP - Rates of reaction, redox reactions? 10 points? An structural isomer of bromobutane (C4H9Br) can be hydrolysed using aqueous sodium hydroxide to produce butanol. This can be represented by the following equation: C4H9Br(l) + OH-(aq) > C4H9OH(l) + Br-(aq) ...
March 27, 2012 by Lola

chemisty
4. N2+3H2----2Nh3 k=1.2 at a T=375C you initially have 0.249mol of N2. 3.21*10^-2mol of H2, and 6.42*10^-4 mol of NH3 in a 3.5L container a.what is the equation to determine the reaction quotient, Q b.determine the reaction quotient Q c. compare Q and K. determine which way ...
March 20, 2011 by shanice

college us history to 1877
compare and Contrast the New England, Southern and Middle colonies using geography including a appraisal of a geographic perspective that considers physical and cultural processes as they effect the areas, population, reason for coming to America, religion, and economy.
September 20, 2012 by tristen

Chemistry
2C6H6(l) + 15O2 (g) ---> 12CO2 (g) + 6H2 (l) Calculate the deltaHrxn using standard heats of formations from Appendix C, paying close attention to the physical states of substances. Thanks!
April 30, 2012 by Julio

Chem
In an experiment 16.81 +/- 0.02 grams of hydrogen peroxide chemically decomposes into the products water and oxygen gas. The measured mass of oxygen gas produced in the reaction is 8.854 +/- 0.003 grams. Report the mass of water produced to the correct number of significant ...
February 8, 2008 by CHEM HELP!

Chem
In an experiment 16.81 +/- 0.02 grams of hydrogen peroxide chemically decomposes into the products water and oxygen gas. The measured mass of oxygen gas produced in the reaction is 8.854 +/- 0.003 grams. Report the mass of water produced to the correct number of significant ...
February 8, 2008 by Chem Help!!

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