chemistry honors

Popular questions
  1. Chemistry Honors

    When a Bunsen burner is ignited, it begins a combustion reaction of methane gas in the air. CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (l) How many moles of water will be produced from the complete combustion of 4 moles of methane? Answer: 8

    asked by Amber M. on June 2, 2018
  2. Chemistry honors

    A 500 g piece of iron changes 7°C when heat is added. How much heat energy produced this change in temperature? C of iron is 0.450 J/g°C

    asked by Anonymous on December 9, 2018
  3. Chemistry Honors

    Which of the following compounds would be able to conduct electricity in molten form? A. CH4 B. PCl3 C. CO2 D. NaCl Answer: NaCl

    asked by Amber M. on June 2, 2018
  4. chemistry honors

    Assuming standard pressure, at what temperature is there an equilibrium between water vapor and liquid water?

    asked by mike on April 5, 2011
  5. Chemistry honors

    Formula: 2LiOH + CO2 yields Li2CO3 +H2O Suppose a lithium hydroxide canister contains 155grams of LiOH. What mass of CO2 will the cannister be able to absorb? If it is found that after 24 hours of use the cannister has absorbed 102 grams of CO2. What

    asked by Liem on January 22, 2013
  6. Chemistry Honors

    Which of the following subatomic particles have a mass of approximately 1 amu? I. protons II. neutrons III. electrons A. I and III only B. I, II, and III C. I only D. I and II only Answer: D

    asked by Amber M. on June 2, 2018
  7. Chemistry Honors

    In a science lab, acids and bases are often stored in high concentration "stock" bottles and then diluted as needed. If 100 mL of a 12 M solution of HCl is diluted to a final volume of 500 mL, what would be the final concentration of the diluted HCl?

    asked by Amber M. on June 2, 2018
  8. chemistry honors

    A student is asked to make an acetic acid/ acetate buffer with a pH of 4.10. The only materials on hand are 300 mL of white vinegar (5.00% by mass acetic acid, density = 1.006g/mL) and potassium acetate. How should the student proceed?

    asked by lola on June 6, 2013
  9. Chemistry Honors

    A sample of 2.0 moles of dihydrogen gas is placed in a container with a volume of 10.4 L. What is the pressure of of the gas in torr if the gas is at 25 degrees Celsius.

    asked by Giselle on February 24, 2015
  10. Chemistry Honors

    What mass of calcium bromide is needed to prepare 150.0 mL of a 3.50 M solution? (Assume that the molecular weight of CaBr2 is 200.618 g/mol) A. 105 g B. 100.42 g C. 0.105 g D. 103.35 g

    asked by Tony on December 16, 2014
  11. Chemistry Honors

    Arthur is performing a lab which requires a 0.2 M solution of calcium hydroxide. However, the only calcium hydroxide solution available has a concentration of 0.5 M. How can Arthur dilute the 0.5 M solution to make 10 mL of a 0.2 M solution? A.He needs to

    asked by Tony on December 16, 2014
  12. Chemistry Honors

    A 0.25 mol sample of n204 dissociates and comes to equilibrium in a 1.5 L flask at 100 degrees C. The reaction is N2O4 > 2 NO2. The Kc at 100 degrees C is 0.36. What are the equilibrium concentrations of NO2 and N2O4?

    asked by Marie Genvieve on July 20, 2013
  13. Chemistry honors

    You have 2.657 x 10^2 mL of oxygen gas (O2) at 7.02 x 10^2 mm of Hg and 46 oC. What is the mass of the sample in milligrams?

    asked by haley on March 22, 2012
  14. Chemistry Honors

    Use the diagram below to answer the following question. What will be water's phase of matter at a temperature of 74°C and a pressure of 4.4 mm? A. mostly liquid B. mostly solid C. solid, liquid, or gas D. mostly gaseous Answer: D

    asked by Amber M. on June 2, 2018
  15. Chemistry Honors

    A sample of water has a temperature of 87.5 d/C. The volume of the sample is 430 mL. What mass of ice at 0.0 d/C will melt with this sample of water if the final temperature of water and melted ice is 0.0 d/?

    asked by Sim on March 27, 2016
  16. Chemistry Honors

    Nitrosyl chloride (NOCl)decomposes to nitrogen oxide and chlorine gases. The concentration of NOCl drops from 0.580 M to 0.238 M in 8.00 min. Calculate the average rate of reaction over this time interval.

    asked by Caden on March 20, 2016
  17. Chemistry Honors

    What volume of a 0.50 M MgSO4 solution will be needed to prepare 100.0 mL of a 0.20 M MgSO4 solution? A.250 mL B.100 mL C.0.250 mL D.40.0 mL

    asked by Tony on December 16, 2014
  18. Chemistry Honors

    If water, a polar molecule, is combined with another polar molecule, what can be said about the substance added to the water? A. The solubility can not be determined by only knowing the polarity. B.It is soluble in water only if the water is poured over

    asked by Tony on December 16, 2014
  19. Chemistry honors

    20 grams magnesium metal react with excess oxygen and 28 grams of magnesium oxide are produced in lab what is percent yield? If 99.8 g of aluminum nitrate are reacted with excess sulfuric acid what would be the theoretical yield in grams of aluminum

    asked by lynn on December 4, 2014
  20. Chemistry Honors

    At a particular temperature, 12.0 mol of NH3 is introduced into a 2.0 container, and the NH3 partially dissociates by the reaction: 2NH3 N2 + 3H2 At equilibrium, 6.0 mol of H2 gas are present. Calculate the K for this reaction.

    asked by Marie Genvieve on July 20, 2013
  21. chemistry honors

    A student is asked to make an acetic acid/ acetate buffer with a pH of 4.10. The only materials on hand are 300 mL of white vinegar (5.00% by mass acetic acid, density = 1.006g/mL) and potassium acetate. How should the student proceed?

    asked by lola on June 6, 2013
  22. Chemistry Honors

    Hydrogen burns to give water. If 200cm3 of H2 reacts with 150cm3 of O2 what volume of water vapor is produced

    asked by Pam on May 29, 2013
  23. Chemistry Honors

    Hello, Can you please tell me how a fisher chart differs from a traditional chart?

    asked by DAVID on November 10, 2010
  24. Chemistry Honors

    I need help balancing equations 1) CH4+O2-->CO2-->+H2O 2) Hf+N2-->Hf3N4 3) Mg+H2SO4-->MgSO4+H2 4) C2H6+O2 -->CO2+H2O 5) Pb(NO3)2 + NaI--> PbI2+NaNO3 6) Fe+O2-->Fe3O4

    asked by S on October 20, 2010
  25. chemistry honors

    how many grams of a stock solution that is 85% H2SO4 by mass would be needed to make 150 grams of a 45.0 percent solution?

    asked by jimmy on September 30, 2010
  26. chemistry honors

    a student collects 400 mL of oxygen at 9.80 kPa. if the tempeture remains constant, what volume would this gas occupy at 9.40 kPa

    asked by sal on May 14, 2009
  27. Chemistry Honors

    I have to design a gadget that will either: light a match, pop a balloon, cause something to change color, lift a 500gm object at least 5cm, Blow out a candle, and/or turn on a light bulb. This experiment can be done by either using baking soda and vinegar

    asked by Kearse on September 16, 2008