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  1. B

    Optical isomerism

    It's in the context of simple http://wwwchem.uwimona.edu.jm:1104/courses/CFT.html". I don't think there's any unobivious rules here, but I don't know...
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    Optical isomerism

    I see your point. If we assume that every H2O molecule occupies one ligand space and does not interact with it's neighbors -- would I then be correct? It's an introductory course, so I assume there's no pitfalls.
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    Optical isomerism

    Hi. I'm asked the following question: What isomers does the complex [\text{Fe}(\text{H}_2\text{O})_6] give rise to? Is it optically active? My answer to the first question would be 'none': The 6 identical H2O molecules are arranged in an octahedral fashion around the central Fe-atom, so...
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    Bonding etc.

    c) Still in the dark. Can't relate these things to the activation energy... sorry. f) Oxygen is more electronegative than nitrogen, so the OH-molecule has a greater dipole strength than the NH-molecule and therefore the hydrogen bond is stronger in the former case (O-H---O). Right? Thanks...
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    Bonding etc.

    Hi. I need help with (part of) this exercise: c) By considering the differences in bonding determine which of the combustion reactions (in part a) I have written combustion reactions for the following hydrides: B2H6, CH4, NH3 and H2S) must be expected to have the lowest energy of activation...
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    Solubility problem

    Hmm, not sure. But I think I know how to do it now. Thanks.
  7. B

    Solubility problem

    It will shift to the right, so the solubility will go up (consistent with my result.) I should compute the I3- concentration and add it to the I2(aq) concentration to find the new solubility, right?
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    Solubility problem

    Hi. I'm preparing for a chemistry exam and I have trouble with this former exam problem: The solubility of I_2\text{(s)} in water at 25ºC is 0.0013 M. Calculate the solubility of I_2\text{(s)} in a 0.1 M solution of KI(aq) by considering this equilibrium: I_2\text{(aq)}+I^-\text{(aq)}...
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    Enthalpy of hydration

    I have no idea, just quoting from the book, basically. Doesn't Li- and Cs-solids exist? I'm a lousy chemist, I know. I would think that "quietly" means slow and "violently" means fast, so the statement is that the reaction rate of Cs + water is larger than the reaction rate of Li + water. I...
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    Enthalpy of hydration

    The Li atoms are smaller, but how does that affect the reaction?
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    Enthalpy of hydration

    Hi. How come that Cs reacts more violently with water than Li, when the enthalpy of hydration for Li is -520 kJ/mol while it is only -276 kJ/mol for Cs. More energy is released in the Li reaction, but still it reacts more quietly? (EDIT: Oops, maybe this should be in the homework section?)
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    Calculate the pH-value of a solution that does not contain water

    Ok, I see. The reaction is this (right?): CO3^2- + CH3COOH -> HCO3^- CH3COO^- How can I determine pH? All I know is that half of the CH3COOH is used up in this reaction.
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    Calculate the pH-value of a solution that does not contain water

    Hi, How do one calculate the pH-value of a solution that does not contain water, pH being equal to -log([H3O+])? I need to calculate the pH-value of a solution where BaCO3 and SrCO3 is dissolved in acetic acid (4 M). The only information I am given is, that half of the acetic acid is...
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    Inorganic chemistry help

    Hi, I'm doing this chemistry report, and I have absolutely no experience in chemistry. We have this solution containg (among some other stuff) Ba^2+, Sr^2+ and Ca^2+ ions along with SO4^2-ions in excess. Now we add some Na2CO3 to transform the sulphates to carbonates. They ask me these...
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