CHEMISTRY COMMUNITY

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What exactly is the residual entropy of an element? More specifically, I'm still confused on why NO has a higher residual entropy than BF3?

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For question 1B, could anyone explain why the change in number of moles in 2 when the equation is
CH4 + 2O2 -----> 2H20 + Co2

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Could anyone explain how in question 4 from Winter 2008, the reaction is first order with respect to B?

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Does the work of expansion for reversible and irreversible process differ in any way?

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How do you determine the number of intermediates in an addition reaction of a hydrogen halide and an organic molecule? Is the Bromine ion considered an intermediate in the first step?

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Yes, the value of A should always be given to you or is usually a constant for very small temperature change.

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When do we need the integrated rate law as opposed to the differential rate law?

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Often the cell reaction is given to you and you're asked to construct the two half equations. When one of the half equations you would construct from the elements in the reaction is not given in the list of standard potentials, what are you meant to use? This was incorporated into question 15 in the...

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In terms of calculating the microstates, when would we use the formula KBln(W2/W1) as opposed to kBln(V2/V1) and also is W the value of microstates itself or is degeneracy a different concept?

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Evaporation and boiling are actually two different processes, in its essence. Evaporation of water from the surface can take place at any temperature whereas the phase change to vapor due to boiling can only take place at 100 degrees celsius.

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Why is that heat is not a state property but temperature is a state property?

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Reversible processes are reactions in which the forward reaction as well as the backward reaction can take place. More importantly, the products formed can react with each other in order to reform the initial reactants.

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In what way does the calculation of pH for a solution with a weak acid differ from calculating pH when there is a strong acid?

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While doing a pH calculation for salt solutions, we were told that if your X value is less than 5% of the initial, its okay to approximate. However, the approximation would take place before you calculate the X value, particularly while cross multiplying. SO when can we determine if we can approxima...

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A neutralization reaction is when an acid and a base react to give water and a salt. The moles of the components named can be calculated by the experimental process of titration as long as the concentration of one of the components is known.

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Salts are in fact included in the reaction equation as long as they are aqueous and can split up into their ions.

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After doing a few questions, I've been confused on the relation between electron pair geometry, lone pairs and the polarity of a molecule. The first step to determining polarity would be to find a non-symmetric electron pair geometry. However if the shape is symmetric and there is a lone pair involv...

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When working on a chemical equilibrium problem with gases, is atm or bar the preferred unit for calculation?

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What exactly do the anti-bonding orbitals signify in the MO theory? Are these orbitals always filled with electrons and how do you determine wether they are?

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You actually answered your own question because the VSEPR theory itself states that electron repulsion affects the molecular shape of an atom. Lone pair-lone pair repulsion is greater than bond pair-bond pair and this causes the bond angle to increase which in turn affects the bond orientation. In t...

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You would never have to calculate the ionization energy of an atom because the value is a constant which is given in the problem. It's usually used to calculate other values.

CHEMISTRY COMMUNITY

Search found 21 matches

Re: Residual Entropy

Winter 2011 Final

Winter 2008 Final

Work formulas

Electrophilic Addition and Intermediates

Re: A as pre-exponential factor

Rate Laws

Half equations

Re: Calculating the number of microstates

Re: Unrelated

State Properties

Re: Reversible and Irreversible Processes

Calculating pH

Making Approximations

Re: 2010 Final Q7B neutralization reaction

Re: Salts in Reactions

Polarity of Molecules

Partial Pressures

Anti-bonding

Re: Electron Repulsion in regards to VSEPR

Re: Ionization Energy