Most popular questions
  1. 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

    asked by yr on April 17, 2011
  2. 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

    asked by Anonymous on April 12, 2011
  3. Chemisrty

    if electricity of sufficient voltage is passed into a solution of potassium iodide in water, a reaction takes place in which elemental hydrogen gas and elemental iodine are produced, leaving a solution of potassium hydroxide. what is the unbalanced

    asked by Mandy on March 20, 2016
  4. chemisrty

    put in decreasing freezing point 0.10m Na3PO4,0.35m NaCl,0.20 m MgCl2, 0.15 m C6H12O6,0.15 m CH3COOH

    asked by Anonymous on June 27, 2010
  5. chemisrty

    A 50.0 mL solution of 1.2 M HCl at 24.1C is mixed with 50.0 mL of 1.3 M NaOH, also at 24.1C, in a coffee-cup calorimeter. After the reaction occurs, the temperature of the resulting mixture is 29.8C. The density of the final solution is 1.05 g/mL.

    asked by jesse on June 18, 2014
  6. 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

    asked by Stoichiometry on August 31, 2011
  7. 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?

    asked by Anonymous on March 10, 2013
  8. Chemisrty

    Would Flame test be useful for detecting metal ions present in a mixture of metal ions?? It is not a reliable method. Atomic spectroscopy would be much more accurate and sensitive than the human eye. To add to the information provided by Bob Pursely, which

    asked by Bryan on October 23, 2006
  9. chemisrty

    Suppose that 0.490 mol of methane, CH4(g), is reacted with 0.640 mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released?

    asked by khari johnson on April 12, 2017
  10. chemisrty

    what is the strongest acid here? H2SO3 H2SO4 H2SeO3 H2SeO4 For oxyacids, the acidity increases with increasing number of oxygen atoms; therefore, H2SO3 and H2SeO3 will be weaker than either H2SO4 or H2SeO4. We have a problem determining which is the

    asked by luis on April 30, 2007
  11. Chemisrty

    What volume of oxygen, measured at STP, can be prepared by heating 2.16g HgO?

    asked by Sam on April 10, 2013
  12. Chemisrty

    How many grams of KClO3 must react to form 42.0 mL?

    asked by Mia on April 4, 2013
  13. 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 ºC. What is the partial pressure (in mmHg) of O2 in this mixture? (Vapor pressure of water @ 22 ºC is 22 mm Hg)

    asked by Marie on September 25, 2012
  14. Chemisrty

    Assuming equal concentrations, rank these solutions by pH: hclo4 caoh2 NH3 koh hbro

    asked by Carlos on March 5, 2016
  15. chemisrty

    what is the balance equation of CH3COOH(aq)+NH3(aq)

    asked by yr on April 18, 2011
  16. 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?

    asked by amy on July 15, 2011
  17. 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

    asked by Courtney on April 12, 2010
  18. chemisrty

    Rank following acids frommost to least acidic: hydrocyanic acid (HCN) Ka = 6.2 × 10−10 hypoiodous acid (HOI) Ka = 2 × 10−11 chlorous acid (HClO2) Ka = 1.2 × 10−2 acetic acid (CH3COOH) Ka = 1.8 × 10−5 1. HOI > HClO2 > CH3COOH > HCN 2. CH3COOH >

    asked by susan on June 8, 2014
  19. chemisrty

    What is the ratio of the average velocity of hydrogen molecules to that of neon atoms at the same temperature and pressure?

    asked by someone on May 13, 2010
  20. Chemisrty

    Calculate the moles of aluminum ions present in 250.0 g aluminum oxide

    asked by Sam on May 10, 2010
  21. 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

    asked by lyan on January 16, 2012
  22. Chemisrty

    H3C6H5O7(aq) + 3Na3HCO3(q)---Na3C6H5O7(aq) + 3H2O(l) + #CO2(g) NaHCO3 = 1.00g H3C6H5O5 = 0.76g CO2= 0.5g 1) show that equivalence amount of cirtic acide for 1.00g of sodium bicarbonate is 0.76g 2)Calculate the theoretical yield of carbon dioxide from 1.00g

    asked by Zaza on October 6, 2016
  23. Chemisrty

    A mineral sample is analyzed for its cobalt and calcium content. A sample is dissolved, and then the cobalt and calcium are precipitated as Co(OH)2(s) and Ca(OH)2(s). At what pH can Co(OH)2(s) be separated from Ca(OH)2(s) at 25 °C? Assume that an

    asked by P on July 9, 2016
  24. 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.

    asked by alex on February 2, 2008
  25. 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

    asked by Aria on April 16, 2014
  26. Chemisrty

    If the water temperature was 30.0C and the atmospheric pressure was 753 torr. What volume of hydrogen gas would you expect to collect if you reacted 0.083g of Ca metal with HCl?

    asked by Chay on November 2, 2015
  27. Chemisrty

    Calculate the work done when 60.0 g of tin dissolves in excess acid at 1.00 atm and 20°C. Assume ideal gas behavior.

    asked by Amber on October 14, 2010
  28. chemisrty

    how can you calculate the net charge of an ion if you know the number of protons, neutrons, and electrons it contains?

    asked by rica on November 4, 2009
  29. 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

    asked by lyan on January 16, 2012
  30. chemisrty

    Which one of the following compounds will NOT be soluble in water? A) NaOH B) Na2S C) K2SO4 D) LiNO3 E) PbO

    asked by maria on July 15, 2016
  31. chemisrty

    The pH of a solution changes from 5.5 to 3.5. This indicates that the [OH−] of the solution has 1. increased by a factor of 100. 2. increased by a factor of 2. 3. decreased by a factor of 2. 4. decreased by 2 M. 5. decreased by a factor of 100. 6.

    asked by susan on June 8, 2014
  32. Chemisrty

    Carbon tetrachloride (CCl4) and benzene (C6H6) form ideal solutions. Consider an equimolar solution of CCl4 and C6H6 at 25°C. The vapor above this solutionis collected and condensed. Using the following data, determine the composition in mole fraction of

    asked by BB on December 1, 2011
  33. Chemisrty

    Determine which law is appropriate for solving the following problem. What volume will 1.56 liters of a gas at 27°C and 745 mmHg of pressure occupy at 100°C and 700 mmHg of pressure? Law used: Boyle's Law Charles' Law Combined Gas Law

    asked by Angel on October 19, 2011
  34. 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

    asked by lyan on January 16, 2012
  35. Chemisrty

    Alexander, who weighs 159lbs , decides to climb Mt. Krumpett, which is 5460ft high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100g bar contains 10g of fat, 40g of protein, and 50g of

    asked by George on September 29, 2008
  36. chemisrty

    how many grams of cai2 are present in 3.28 moles? Can someone explaine how to do this question as well?

    asked by omar on January 24, 2013
  37. chemisrty

    The ionic compound sometimes called uranium yellow is used to produce colored glazes for ceramics. It is 7.252% sodium, 75.084% uranium, and 17.664% oxygen. What is the empirical formula for this compound? This compound has a molecular mass of 1268.06

    asked by tash on November 10, 2014
  38. chemisrty

    calculate the delta H when 0.150 mmol of AgCl dissolves in water?

    asked by samadhi kandekumbura on September 9, 2012
  39. 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,

    asked by Monster on May 18, 2011

    Calculate the energy required to raise the temperature of 160.0 g Ag from 273 K to 295 K.

    asked by Tonya on April 21, 2013
  41. chemisrty

    how to prepare 40% of Nitric acid from 70% of the Nitric acid solution

    asked by meena on April 26, 2013
  42. Chemisrty

    How can I test for catalase in a carrot using an experiment?

    asked by Christy Fultz on November 20, 2007
  43. 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

    asked by kim on March 29, 2012
  44. Chemisrty

    What is the pH of a 0.20 M solution of NH4Cl? [Kb(NH3) = 1.8 × 10−5]

    asked by Peter on February 22, 2011
  45. chemisrty

    what voule of 12M hydrochloric acid must be diluted with distilled water to prepare 5.0L of 0.10M HCl?

    asked by Cassie on December 12, 2010
  46. 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

    asked by Jay on November 16, 2010
  47. Chemisrty

    To what volume must 1.0 l of a 6.0 m solution of hcl be diluted in order to prepare a 0.2 m solution? I just need to find wht steps i need to take to get the answer

    asked by Jacob on April 27, 2015
  48. Chemisrty

    the freezing point of water is -1.86 degree Cm, if 5.00 g Na2SO4 is desolve at 45.0g H2o the freezing point is changed by -3.82 degree C. Calculate the Van't Hoff Factor for Na2SO4

    asked by saemreza on April 26, 2014
  49. 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?

    asked by Liz on June 30, 2010
  50. chemisrty

    Q6) A 10 L container contains a mixture of 0.8 g of He and 8 g of Ar at 0 oC. a) (1 pt) Calculate the total pressure of the gas mixture. b) (1 pt) Calculate the partial pressure of each gas in the gas mixture. c) (1 pt) If the initial total pressure of the

    asked by lyan on January 21, 2012
  51. 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.

    asked by lyan on January 16, 2012
  52. 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

    asked by sakura_09 on February 23, 2010
  53. chemisrty

    1 When chemicals pour on the skin, the laboratory first aid is to ---------------. Apply 1% sodium carbonate Apply 1% boric acid solution Flush the eye with a copious amount of clean lukewarm running water Wash with soap and warm water 2 For cut sustained

    asked by mikel on August 24, 2015
  54. 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.

    asked by ashley on April 25, 2013
  55. 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

    asked by Tasia on November 16, 2012
  56. chemisrty

    hello how would i draw a monomer CH2-CHCH=CH2 I have to draw three monomer units can anyone help

    asked by bex on March 15, 2007
  57. chemisrty

    the ph of a 4.0 mol/L solution of hydrogen fluoric acid is 3.0 is this a concentrated or diluted explain I believe it is concentrated because 3.0 is higher then 0.5 mol/L but it can also be diluted

    asked by Anonymous on April 7, 2016
  58. 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.

    asked by Anonymous on May 31, 2013
  59. Chemisrty

    An intravenous line provides a continuous flow of drug directly into the blood. Assuming no initial drug in the blood, the amount of drug in the blood t hours after the dosing begins in m(t) - (a/k)(1-e^-kt), for t (=>)0, where k is the rate constant

    asked by Rach on April 17, 2012
  60. 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

    asked by daniel on March 22, 2009
  61. chemisrty

    a. At low temperatures, 1,1,2, trichloro ethane is not free to rotate about the carbon-carbon bond. It will be stuck in its lowest energy position. Is 1,1,2, trichloro ethane a chiral molecule when trapped in this position? 1,1,2, trichloro ethane is

    asked by Anonymous on June 1, 2013
  62. 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?

    asked by help on March 20, 2012
  63. chemisrty

    can anybody give me the density of arsenic oxide at STP is this the correct formula volume = mass/ density thanks Yes, but if you want the density, it is density = mass/volume. The number I have seen floating around on this board is 17.8 g/L but the

    asked by bex on February 4, 2007
  64. Chemisrty

    A 10.0 g sample of ice at -14.0°C is mixed with 124.0 g of water at 81.0°C. 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/g°C, respectively, and the

    asked by Nancy on December 9, 2012
  65. 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?

    asked by lyan on January 16, 2012
  66. 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?

    asked by Kathy on January 11, 2011
  67. Chemisrty

    What volume of 0.740 M , HCl in milliliters, is required to titrate 2.05 g of Na2CO3 to the equivalence point?

    asked by Julian on October 4, 2015
  68. 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?

    asked by Shelly on October 9, 2011
  69. 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

    asked by Bryan on October 31, 2006
  70. Chemisrty

    Identify the type of question. Is it a literature research question, observation only question, demonstration question, or investigation question? How would you determine the PH of vinegar using cabbage juice as an indicator? (investigation) Do germaniting

    asked by Anonymous on September 14, 2015
  71. 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?

    asked by Kristen on October 20, 2013
  72. chemisrty

    could freezing point depression be used for substances not soluble in water?

    asked by Anonymous on April 27, 2011
  73. 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

    asked by nicole on November 21, 2010
  74. chemisrty

    I have no idea how to do this activity..can someone please help!? In this activity you will investigate how chemical reactions are limited by the amount of reactants present. You will be using paper clips to represent atoms. You can describe the quantities

    asked by Ethan on November 16, 2009
  75. chemisrty

    Why do gases deviate from ideal behavior at very high pressures?

    asked by mike on September 26, 2008
  76. chemisrty

    what is the balanced equation for thereaction of aluminum selenide with water including the physical states reactants and products im given hydrogen selenide prepared by reacting aluminum selenide with water other product solid aluminum hydroxide please

    asked by donald on February 1, 2007
  77. Chemisrty

    You wish to make a 0.195 M hydrochloric acid solution from a stock solution of 6.00 M hydrochloric acid. How much concentrated acid must you add to obtain a total volume of 50.0 mL of the dilute solution?

    asked by Letishia on November 2, 2014
  78. 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

    asked by M on March 17, 2013
  79. 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

    asked by chris on November 24, 2012
  80. Chemisrty

    How many L of carbon dioxide gas will be produced from the decomposition of 5.0g of sodium hydrogen cardonate?

    asked by Elizabeth on May 5, 2012
  81. 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

    asked by gary on June 29, 2010


    asked by Donna on February 28, 2010
  83. 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

    asked by bex on March 14, 2007
  84. chemisrty

    I have seen on the chemistry answers that a symbol is used please can you tell me what it means they are the upside v eg Na^ and CN^ It means that the number or symbol that follows is placed in the top corner of Symbol before it E.g cm^3 or CN^- you just

    asked by bex on March 12, 2007
  85. chemisrty

    if i am trying to find the diameter of an oil molecule and express my answer in scientific notation. the info is drop of oil 0.05 cm3 from a dropper spreads out to 40 cm2 is it vol = l x w x h 0.05cm3 = 20 x 20 xh 0.05 cm3 = 40cm2 after this im stuck as i

    asked by bex on February 17, 2007
  86. chemisrty

    I took 6.22 g of potassium hypochlorite and dissolved it up in a 100.0 mL flask. I then added 8.00 mL of 2.00 M nitric acid. The solution should be able to buffer that addition. How much more (mLs) of the nitric acid can the system take before it is no

    asked by Storme on February 27, 2017
  87. chemisrty

    What is the total pressure of the gas produced in the burette if it contains nitrogen gas whose pressure is 1.5 atm, oxygen gas whose pressure is 1.6 atm and water vapour with a pressure of 1.3 atm.

    asked by lusiana on May 24, 2015
  88. chemisrty

    how many ml of a .1M HCl are required to react completely with 1 gm mixture of Na2CO3 ?

    asked by swati on April 14, 2013
  89. chemisrty

    What is ΔGo at 1000 oC for the following reaction? CaCO3 (s) CaO (s) + CO2 (g)

    asked by laquisha on November 27, 2012
  90. chemisrty

    volumeof oxygen produced if 130.0g of water is completely decomposed at STP?

    asked by mike john on February 9, 2012
  91. chemisrty

    calculate the percent by mass of carbon(c) in the amino acid arginine,C6H16N4.

    asked by michelle on February 27, 2011
  92. Chemisrty

    what mass of sodium phosphate is required to make 250mL of 0.10mol/L solution?

    asked by Jenna on February 22, 2010
  93. Chemisrty

    formula for silicon dioxide?

    asked by Me on September 8, 2008
  94. chemisrty

    which element results if 2 protons and 2 neutrons are ejected from a radium nucleus with atomic num 88 and mass num 226 how do i go about this please can you help If you can add you can do these. 88Ra226 ==>2X4 + zzYww. Now make the numbers add. Protons

    asked by bex on February 17, 2007
  95. chemisrty

    i don't 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.

    asked by gabby on January 4, 2007
  96. 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

    asked by Anonymous on June 1, 2013

    How many liters of H2O will form when excess O2 reacts with 100 liters of H2 according to the gas phase reaction:

    asked by KRISTY on May 3, 2013
  98. Chemisrty

    How many grams of lithium metal would be produced if 0.500g of magnesium was added to a solution of lithium chloride?

    asked by Elizabeth on May 5, 2012
  99. 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?

    asked by lyan on January 16, 2012
  100. chemisrty

    what is the final concentration of a solution if 100mL of water is added to a 25mL of 5.0 M NaCl?

    asked by mandy on November 16, 2011


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