Search results

  1. C

    Organic Chem - Products

    Hey, I have a question which asks me to provide two examples of how organic chem can be used to improve existing products and therefore provide solutions to newly identified health or environment problems. One example is unleaded gasoline, instead of leaded. What are some others? I've...
  2. C

    Dissociation constant

    I understand this tells us how strongly binded a solution is. So I hve hydroflouric acid, it says it contains 2.0g of HF per litre and has a PH of 2.2. How do I figure what the dissociation constant for HF is? Thanks
  3. C

    Formation of products is strongly favoured in the acid-base system

    The formation of products is strongly favoured in the acid-base system: HX + B- <--- HB + X- ----> a) Identify the bases competing for protons. b) Which base is stronger? c) Which is the weaker acid, HX or HB? d) Does the K for this system have a large or small value...
  4. C

    Question - Heat of Reaction

    For the reaction CO + NO2 ----> CO2 + NO the activation energy for the forward reaction is 135kj/mol of CO reacted. a) determine the heat of reaction b) from the data given, and the deltaHr for the reaction, determine the activation energy for the reverse reaction c) draw and label a...
  5. C

    Mutiple Choice - Equilibrium state

    1. Consider a stoppered flask containing benzene, iodine, and air, which has reached equilibrium at 298K. Which one of the following statements converning the system at equilibrium is true? a) The pressure of the vapour phase is not constant b) Evaporation of the liquid continues. c) The...
  6. C

    Litres to moles?

    How would you go about changing liters, like 1L into moles? Thanks
  7. C

    Chem Equilibrium Q

    A(g) <--- <--- 2B(g) + C(g) When 1.00mol of A is placed in a 4.00L container at temperature t, the concentration of C at equilibrium is 0.050mol/L. What is the equilibrium constant for the reaction at temperature t? Thanks for the help.
  8. C

    Le Chatelier's Principle

    I've read on it, but dont get this question. " The digestion of some foods, such as red meat, releases urate ion C5H3N4Otothe-3 into the bloodstream. An excess of urate in the blood can result in the formation of sodium urate crystals in joints and tissues. This leads to a painful form of...
  9. C

    Figure out the vapor pressure

    a 1 L container with 5 mL of water held at 20degcel I have to figure out the vapour pressure. I was told to use PV=nRT..but how do I find n? thanks
  10. C

    Will a precipitate form wiht this CaCl2 and NaOH mixture

    The solubility product calcium hydroxide, Ca(OH)2 is 7.9 * 10tothe-6 at 25degcel. Will a precipitate form when 100mL of 0.10mol/L of CaCl2 solution and 50.0mL of 0.070 mol/L of NaOH solution are combined?
  11. C

    Help with 2 Q's

    A(g) ----> 2B(g) + C(g) <---- When 1.00mol of A is placed in a 4.00L container at temp t, the conventration of C at equilibrium is 0.050mol/L. What is the equilibrium constant for the reaction at temperature t? Also have to Calculate the K(sp) for each of the salts whose solubility...
  12. C

    How to define dynamic equilibrium

    Just a few short questions: I have to define dynamic equilibrium state in terms of a) reaction rates b) change in observable properties and c) energy and entropy state I also have to explain in which of the following closed containers has the greatest vapour pressure. the choices are a)...
  13. C

    One question

    Ethanol and water are completely miscible; that is, they dissolve in each other in all propertions: a) When the two substancse are mixed, is randomness increased or decreased? b) Head is liberated in the dissolving process. Does the tendency toward the minimum energy favour the seperated...
  14. C

    Rates of Reaction

    I have some quick questions that I need some help with: 1. Why would a simple chemical reaction such as NO9g) + 1/2O2(g) -----------> NO2(g) most likley be most rapid at the start? 2. In what ways can the rate of dissolving a lump of sugar be increased? (at least 3) 3...
  15. C

    Repulsive/Attractive Forces

    What are some repulsive and attractive forces that would infludence the formation of chemical bonds between two atoms?
  16. C

    Chemical Bonding

    1. What test would determine whether a solid substance contains ionic bonds? and 2. a) Explain why graphite is soft and has a high melting point. b) Explain why diamond is hard and has a high melting point. c) Why is diamond a poor conductor of an electric current and graphite a good...
  17. C

    Review Questions

    Doing a review for exams but some word type questions I dont understand, and another question thats not word type. Anybody that can answer please do, I do need to know to do it by Friday morning. Here they are... Question 1.... An industrial plant is confronted with a problem of...