All Questions
Tagged with ionic-compounds melting-point
10
questions
3
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2
answers
802
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Why is the thermal stability of calcium carbonate higher than that of magnesium carbonate even though lattice energy decreases down a group?
The difference in thermal stability of $\ce{CaCO3}$ and $\ce{MgCO3}$ can be explained using Fajans' rules, but why not using the lattice energy method?
Why is the thermal stability of $\ce{CaCO3}$ ...
-1
votes
1
answer
231
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Covalent Bonds and Ionic Bonds [duplicate]
Covalent bond is a strong bond compared to Ionic Bonds but Ionic Compounds have higher melting and boiling points then covalent compounds. Why?
- 11
2
votes
1
answer
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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
6
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4
answers
510
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Is it possible to freeze water by dissolving a salt?
Theoretically, by dissolving a salt in water the melting point lowers, approximately 1.86 K��kg/mol, making it more difficult to freeze water. However, the process of dissolution of certain salts is ...
- 169
4
votes
1
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Is molten potassium nitrate possible?
Is it possible to melt potassium nitrate without it decomposing into potassium nitrite and oxygen? If so when it solidifies does it keep its oxidizing properties?
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2
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Why is the melting point of magnesium oxide higher than aluminium oxide?
There's a graph of the melting points of period three oxides. The melting point of magnesium oxide is several hundred Kelvin higher than aluminiumoxide. I can't find any explanations for this on the ...
- 291
2
votes
1
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Melting point of ocean salt: eutectic?
I'm interested in the melting point of ocean salt. While sodium chloride has a melting point of 801 °C, ocean salt contains 15 % other ions, mainly sulphate, magnesium, calcium and potassium (the ...
- 1,220
0
votes
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answer
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Melting points of alkali metal halides
The correct order of melting point of alkali metal halides is:
$\ce{MF}>\ce{MCl}>\ce{MBr}>\ce{MI}$
$\ce{MI}>\ce{MBr}>\ce{MCl}>\ce{MF}$
$\ce{MCl}>\ce{MF}>\ce{MBr}>\ce{MI}$
$\...
- 780
7
votes
1
answer
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Crystal structure vs melting point
Calcium oxide has a melting point of $\ce{2700^\circ C}$ and sodium chloride has a melting point of $\pu{801^\circ C}$.
If they have the same crystal structure and ions are about the same distance ...
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How can sodium chloride melt ice or keep it frozen?
In European countries, they use $\ce{NaCl}$ or $\ce{KCl}$ to melt ice during the winter season.
In Asian Countries, they use $\ce{NaCl}$ to keep the ice without melting, for example in ice cream and ...
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