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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: -_-zzzz on October 26, 2018, 10:07:38 AM

Title: States in Reactions
Post by: -_-zzzz on October 26, 2018, 10:07:38 AM

Hey guys,

In chemical reactions involving metals, why do we say they are in the solid state (e.g Na (s))?

Thanks in advance.

Title: Re: States in Reactions
Post by: sjb on October 26, 2018, 10:25:14 AM

We don't, not always - but what would you suggest we use instead?

Title: Re: States in Reactions
Post by: -_-zzzz on October 26, 2018, 06:27:44 PM

Quote from: sjb on October 26, 2018, 10:25:14 AM

We don't, not always - but what would you suggest we use instead?

Thanks for the response! Although I’m just confused as to why we use any state  because there are no interactions between sodium atoms for any “state” to exist.

Title: Re: States in Reactions
Post by: jeffmoonchop on October 26, 2018, 07:09:49 PM

There are always interactions. Its a solid because the atoms are static due to ionic interactions. If you heat it up to 98C the interactions break and the atoms begin to move. Now its a liquid. Keep heating up to 883C and the interactions keeping the atoms close together are broken and atoms begin to leave the liquid. Its boiling and becoming a gas. Go back to basics, bonding.

Title: Re: States in Reactions
Post by: wildfyr on October 26, 2018, 08:38:24 PM

Quote

Its a solid because the atoms are static due to ionic interactions.

Just to make an important distinction here, the interactions in sodium solid are not ionic. That only occurs between formally charged species. The interactions due to metallic bonding. Wikipedia defines it thusly:

Metallic bonding is an extremely delocalized communal form of electron deficient covalent bonding.

https://en.wikipedia.org/wiki/Metallic_bonding#The_nature_of_metallic_bonding

Title: Re: States in Reactions
Post by: -_-zzzz on October 27, 2018, 01:18:50 AM

Quote from: wildfyr on October 26, 2018, 08:38:24 PM

Quote

Its a solid because the atoms are static due to ionic interactions.

Just to make an important distinction here, the interactions in sodium solid are not ionic. That only occurs between formally charged species. The interactions due to metallic bonding. Wikipedia defines it thusly:

Metallic bonding is an extremely delocalized communal form of electron deficient covalent bonding.

https://en.wikipedia.org/wiki/Metallic_bonding#The_nature_of_metallic_bonding

Hey there! When solid sodium undergoes a redox reaction with chlorine gas (Cl2), why do we say that the sodium atoms are oxidised? Because there are no sodium "atoms" in solid sodium.

Title: Re: States in Reactions
Post by: Borek on October 27, 2018, 03:48:33 AM

Quote from: -_-zzzz on October 27, 2018, 01:18:50 AM

Hey there! When solid sodium undergoes a redox reaction with chlorine gas (Cl2), why do we say that the sodium atoms are oxidised? Because there are no sodium "atoms" in solid sodium.

Have you read my answer in your other thread?

Yes, there are sodium atoms in the solid sodium.