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41 votes
5 answers
19k views

Why does potassium react more violently with water than lithium?

Recently, I was telling my friends about the violent reaction that takes place when you throw potassium into water. Soon after, a friend of mine claimed that lithium would react more violently than ...
Nick's user avatar
  • 529
16 votes
4 answers
28k views

Why is fluorine more reactive than chlorine?

Why is fluorine more reactive than chlorine despite chlorine having a higher electron affinity?
Luckylak's user avatar
  • 227
14 votes
2 answers
18k views

Why does N₂ react with O₂ to Form NO at high temperatures?

This also raises questions that I have about the Haber Process which produces ammonia ($\ce{NH3}$) from molecular nitrogen ($\ce{N2}$) and hydrogen ($\ce{H2}$). I have heard multiple times that bond ...
Nick's user avatar
  • 442
13 votes
1 answer
672 views

What are the properties of COₓ where x ≥ 3?

$\ce{CO_x}$ are part of the oxocarbon molecule class. Commonly known are $\ce{CO}$ and $\ce{CO2}.$ However, there are molecules in which $x$ is equal to or larger than $3.$ Those molecules are barely ...
JMRD's user avatar
  • 139
11 votes
1 answer
22k views

How does HF dissolve glass?

By what mechanism does HF proceed in dissolving glass? Why is it the only acid that has this capability? Is it because of the small size and high electronegativity of fluorine?
user avatar
11 votes
1 answer
465 views

Why does radium form a nitride rather than oxide when exposed to air?

The Wikipedia article states: Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride ($\ce{Ra3N2}$)....
Petr's user avatar
  • 451
11 votes
2 answers
307 views

Silver Tarnish and Reactivity Series

I read that silver in the presence of hydrogen sulfide corrodes to form silver sulfide and hydrogen. $$\ce{Ag + H2S -> Ag2S + H2}$$ But in the reactivity series silver is placed much below hydrogen....
Shub's user avatar
  • 408
10 votes
3 answers
65k views

Why doesn't copper react with hydrochloric acid while the other metals do?

5) Which one of the following metals does not react with hydrochloric acid? A. zinc B. magnesium C. iron D. copper E. aluminium The right answer must be copper, but why ...
Adam's user avatar
  • 849
10 votes
1 answer
1k views

Reactivity of different isomers of N2F2

$\ce{ N2F2}$ exists in two forms cis and trans. Today my chemistry teacher tells me that among the two only cis form takes part in reactions and that it is more reactive. But I have read elsewhere ...
Karmanya GB's user avatar
10 votes
3 answers
60k views

How can I relate the reactivity series to electronegativity and ionization energy?

I am trying to figure out how the reactivity series comes about. My understanding is that elements with a higher electronegativity will be more reactive than elements with a lower electronegativity, ...
spraff's user avatar
  • 493
9 votes
2 answers
480 views

I can't choose the set of 3 chemicals with each of which Si will react (out of 5 possible sets)

This is one of the questions used in the Russian State Chemistry Exam. One needs to select the set of chemicals in the second column such that each of them would react with the element or chemical in ...
CowperKettle's user avatar
  • 3,276
9 votes
3 answers
2k views

Why is tantalum so unreactive?

What is the fundamental argument behind explaining why Ta metal is so inert and does not usually participate in corrosion? I know that it forms a protective oxide, but nothing explains why in an ...
sciencenewbie's user avatar
9 votes
1 answer
812 views

Is ruthenium really invulnerable to aqua regia?

Recently, I answered a question "What metals aren't dissolved in/attacked by aqua regia?" in which I finally concluded "ruthenium is resistant to aqua regia in any form at any concentration of ...
Nilay Ghosh's user avatar
  • 26.3k
9 votes
1 answer
25k views

Reaction between magnesium metal and sodium hydroxide: Does this even happen?

Came across this question in a book: Among aluminum, zinc, tin and magnesium, which metals (if any) will react with an aqueous solution of sodium hydroxide to displace dihydrogen? The answer to ...
paracetamol's user avatar
  • 18.8k
9 votes
1 answer
3k views

How does conjugation affect reactivity?

From this topic on MOs of butadiene vs ethene, it is clear that when two ethene molecules are combined to extend the conjugate chain, the HOMO is raised in energy and the LUMO is lowered in energy. ...
Adroit's user avatar
  • 780

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