All Questions
Tagged with ionic-compounds energy
10
questions
2
votes
3
answers
328
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Why would a metal form an ionic compound with a nonmetal from a lower period?
Take sodium iodide for example. I understand both elements can obtain a full outer shell via the electron transfer. But doesn't the electron move from a lower-energy orbital ($3s$ in sodium) to a ...
- 131
0
votes
0
answers
55
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Data for Madelung Constants
Where can I find data for the Madelung constants for various ionic compounds? Specifically, I am looking at silicon tetrachloride, yttrium (III) chloride, zirconium (IV) oxynitrate hydrate, niobium (V)...
1
vote
1
answer
959
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Why does lattice enthalpy decrease with increasing ionic size?
Lattice enthalpy decreases as ions get larger, but I have found two explanations:
The charge density is greater in smaller ions, so greater attraction
The ions are themselves able to get closer ...
- 209
2
votes
1
answer
4k
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Why does aluminum chloride have a higher lattice energy than aluminum fluoride?
From the table below (source: McMurry's Chemistry [1, p. 212]), it is evident that $\ce{AlCl_3}$ has a higher lattice energy than $\ce{AlF3},$ even though $\ce{F}$ is smaller than $\ce{Cl}$. Why is ...
- 2,109
7
votes
2
answers
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Which has higher lattice energy: MgO or LiF?
Which has higher lattice energy: MgO or LiF ?
A compound has higher lattice energy if it's ions have smaller size and greater charge
Li cation is smaller than Mg cation => +1 for (LiF)
Fluoride ...
- 101
4
votes
1
answer
3k
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How to know which ionic compound have the highest lattice energy without knowing the values of the radii?
Given two ionic compounds, for instance:
$$\ce{CaS} \quad \mathrm{or} \quad \ce{KCl}$$
What is the procedure to predict which of the two have the highest lattice energy (in absolute value)?
(...
- 225
6
votes
2
answers
10k
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Difference between lattice energy and thermal stability
For an ionic compound, is it always true that the greater the thermal stability, the greater the lattice energy. E.g. for 2 ionic compounds MX and MY, if MX has a higher thermal stability than MY, ...
- 223
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votes
1
answer
1k
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Energetics of Bond formation
Back to chemistry after 2 months and got stuck in the beginning! That's why I don't like it. Anyways, come to the question please.
Following are the words from my textbook (Don't ask the name ;-)
$$\...
- 312
2
votes
0
answers
583
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Using electron affinity to calculate lattice energy
I am trying to calculate the lattice energy of $\ce{CaBr2}$, I am uncertain of how to incorporate the electron affinity value provided for $\ce{Br2}$ into my calculation.
Since electron affinity is ...
- 105
4
votes
1
answer
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Chemical bonding - lattice energy
Question: Why is ionic lattice energy inversely proportional to the radius of the atom?
Most heterogeneous covalent molecules are polar to some extent. The degree of polarity, or the dipole moment, ...
- 735