Geek_shay
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Why is chlorine a gas at room temperature ,but sodium chloride is a solid at room temperature?
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Matrix123
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(Original post by Geek_shay)
Why is chlorine a gas at room temperature ,but sodium chloride is a solid at room temperature?
Elements (chlorine) have different physical and chemical properties to the products (sodium chloride) that contain them. There is also a stronger structure with the salt because it has ionic bonds.
I hope that helps.
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rxns_00
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(Original post by Geek_shay)
Why is chlorine a gas at room temperature ,but sodium chloride is a solid at room temperature?
Chlorine molecules are bonded covalently and have weak intermolecular forces between them (dipole-dipole and van der Waals). Little energy is required to loosen the bonds and therefore the substance is a gas at 273K.
Sodium chloride is composed of an ionic lattice. There are strong electrostatic forces acting on all ions attracting them to all oppositely charged ions, meaning that multiple strong ionic bonds are involved. A lot of energy is required to overcome these and therefore at 273K the ions do not have enough KE for the substance to be anything other than a solid
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Docjones1
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Bit shaky on my AS but I believe it's because NaCl has a structure of giant ionic lattice which means the intermolecular forces are strong and require more energy to break than Cl2, which has weaker Van der Waals forces. Because it requires more heat energy the melting point will mean it's a solid whereas Cl2's boiling point will have been reached by room temperature so it'll be a gas
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rxns_00
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(Original post by Docjones1)
Bit shaky on my AS but I believe it's because NaCl has a structure of giant ionic lattice which means the intermolecular forces are strong and require more energy to break than Cl2, which has weaker Van der Waals forces. Because it requires more heat energy the melting point will mean it's a solid whereas Cl2's boiling point will have been reached by room temperature so it'll be a gas
Sodium chloride cannot have intermolecular forces as it is not composed of molecules

Op that will be chemical error and 0 marks most likely if you put that down
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Docjones1
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(Original post by RonnieRJ)
Sodium chloride cannot have intermolecular forces as it is not composed of molecules

Op that will be chemical error and 0 marks most likely if you put that down
Are moles composed of molecules?
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rxns_00
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(Original post by Docjones1)
Are moles composed of molecules?
Moles? It is a ratio of mass to Mr, so for sodium chloride we would use Mr for a single neutral unit, so NaCl. But sodium chloride does not exist in molecular form
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Maker
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(Original post by Docjones1)
Are moles composed of molecules?
No, moles are a unit for measuring the number of atoms or molecules
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hoafanuk
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(Original post by Docjones1)
Are moles composed of molecules?
Not necessarily. A mole is simply an amount, the number of particles present of a particular substance. For example, you could have a mole of Mg, however the particles here would be atoms, not molecules.
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Docjones1
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(Original post by hoafanuk)
Not necessarily. A mole is simply an amount, the number of particles present of a particular substance. For example, you could have a mole of Mg, however the particles here would be atoms, not molecules.
(Original post by Maker)
No, moles are a unit for measuring the number of atoms or molecules
(Original post by RonnieRJ)
Moles? It is a ratio of mass to Mr, so for sodium chloride we would use Mr for a single neutral unit, so NaCl. But sodium chloride does not exist in molecular form
What about naked mole-rats?
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Geek_shay
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(Original post by RonnieRJ)
Chlorine molecules are bonded covalently and have weak intermolecular forces between them (dipole-dipole and van der Waals). Little energy is required to loosen the bonds and therefore the substance is a gas at 273K.
Sodium chloride is composed of an ionic lattice. There are strong electrostatic forces acting on all ions attracting them to all oppositely charged ions, meaning that multiple strong ionic bonds are involved. A lot of energy is required to overcome these and therefore at 273K the ions do not have enough KE for the substance to be anything other than a solid
Thank you so much , I understand it now
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Docjones1
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(Original post by Geek_shay)
Thank you so much , I understand it now
You're welcome
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Geek_shay
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(Original post by Docjones1)
You're welcome
Thanks to you aswl
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rxns_00
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(Original post by Docjones1)
You're welcome
Shush boy u would've got her 0/3
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Absent Agent
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(Original post by RonnieRJ)
Shush boy u would've got her 0/3
That might be true but almost everyone on here makes mistakes. If anybody is wrong then it would be better to explain to them why they were wrong rather than explicitly pointing out the error. I hope you don't mind me saying this
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rxns_00
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(Original post by Mehrdad jafari)
That might be true but almost everyone on here makes mistakes. If anybody is wrong then it would be better to explain to them why they were wrong rather than explicitly pointing out the error. I hope you don't mind me saying this
That was a joke you realise?

And yeah I did explain why they were wrong in my previous post thanks
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Docjones1
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(Original post by Mehrdad jafari)
That might be true but almost everyone on here makes mistakes. If anybody is wrong then it would be better to explain to them why they were wrong rather than explicitly pointing out the error. I hope you don't mind me saying this
Thanks Mehrdad you are a true TSR hero for standing up to RonnieP
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