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Questions tagged [alkali-metals]

For questions about the alkali metals (group 1), their compounds, and their physical and chemical properties. For questions specifically about hydrogen, use tag [hydrogen] instead.

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2answers
90 views

Flame Test Spectrograms Not Lining Up With Reality

In my AS Level chemistry class we had tried some DIY spectroscopy of flame tests with the aim of identifying anions in certain salts. We got as far as building the spectrometer inspired by Paper Craft ...
8
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1answer
99 views

Are crown ethers “recycled”, typically?

I know that crown ethers have the interesting property of strongly complexing alkali metals, which allows them to be used in organic solvents (eg. as "dissolving-activity enhancing agents" for ...
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2answers
3k views

Which of sodium or lithium will be more reactive with oxygen?

I do not understand how you can work out which element will react more readily with another element. For example, I have lithium (Li) and sodium (Na) and I am trying to work out which element will ...
4
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1answer
53 views

Does aluminum oxide react with rubidium?

I have rubidium vapor inside of the vacuum chamber. Inside the vacuum chamber, there are two flat stainless steel coated with aluminum oxide at temperature ~100 °C. Since rubidium is active, I am ...
4
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1answer
107 views

Unusual oxidation states of alkali metals

When going through list of oxidation states on Wikipedia I encounterd there that sodium, potassium, rubidium and caesium exhibit oxidation states of -1, but not lithium, even though its ...
4
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1answer
17k views

Why do the boiling and melting points decrease as you go down group 1 and vice versa for group 7?

I used to think that because an alkali metal needs to lose one electron to complete its outer shell, when the atom increases in size (atomic radius), the electron would be easier to lose as the ...
3
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1answer
663 views

Coordination number of carbon in methyllithium tetramer

According to J. D. Lee's Concise Inorganic Chemistry, the coordination number of carbon in $\ce{Li4(CH3)4}$ is $7$. But the structure of the tetramer is Doesn't carbon have coordination number $6$ ...
3
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1answer
64 views

Are there known compounds of caesium with oxidation number >1?

Given that the left neighbor of caesium, xenon, does have fluorides and oxides, it is not inconceivable that caesium can have oxides or fluorides with an oxidation number higher than 1. Are such ...
3
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1answer
43 views

What's the densest alkali metal?

This was asked in a school exam of mine, GCSE curriculum, exactly as it was worded on the title. I found this question a bit vague, and answered it francium, however of course francium is just an ...
3
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0answers
35 views

What is the pale green solution from dissolving sodium hydroxide in a stainless steel flask?

I have previously used drain/sink cleaner gel based on sodium hydroxide but noticed that caustic soda crystals were a lot cheaper. I decided to experiment with making my own cleaner. I bought a 1 ...
2
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0answers
56 views

Why doesn't lithium form dilithium crystals? (Calling Mr.Spock) [duplicate]

Hydrogen is in the first column of the periodic table. At STP it is a diatomic gas. When cooled and/or under pressure it forms a crystalline solid of di-hydrogen molecules. Calculations indicate that ...
2
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1answer
11k views

Alkali metal carbonates, their thermal stability and solubility [duplicate]

From Li to Cs, thermal stability of carbonates increases. From Li to Cs, due to larger ion size, hydration enthalpy decreases. So, solubility should decrease from Li to Cs. But, experimentally, order ...
1
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1answer
83 views

Reaction of potassium with water

In general, when we put potassium into water, it will produce potassium hydroxide and hydrogen: $\ce{2K + 2H2O ⟶2KOH + H2}$ However isn't the following reaction also possible? $\ce{2K + H2O ⟶K2O + ...
1
vote
1answer
98 views

Does the van der Waals force not affect the alkali metal 's trend of decreasing melting points down the table? [duplicate]

Melting and boiling points increase further down the halogen group, but they decrease further down the alkali metal group. I know that the former's trend has to do with the van der Waals force, but I ...
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0answers
38 views

Potassium ethoxide

Is it possible to make potassium ethoxide by mixing $\ce{KOH}$ and $\ce{EtOH}$ in the presence of a dehydrating agent like $\ce{MgSO4}$ or $\ce{CaO}$ or $\ce{K2CO3}$? The easy way is adding metallic ...
0
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1answer
51 views

Why is the reason for color different in these two cases? [closed]

I have read in a book (NCERT India) about flame color for salts of alkali metal and color of transition metal complexes. In the first case, it says that during excitation of electrons to higher ...
0
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0answers
2 views

Hydration, Coordinate Bonding, and Reduction Potential in Groups 1 and 2 Elements

Whenever an alkali metal such as Lithium is hydrated/solvated, coordinate bonding occurs and it is the high hydration enthalpy of lithium which makes it the strongest reducing agent in aqueous ...