Fichas
Structure and bonding in the first 20 elements
Fichas del conjunto (11)
- 1Do metallic elements have high or low boiling points?High boiling points as there is a strong attraction between the metal ions and delocalised electrons
- 2Name some covalent molecular elements.All diatomic elements (e.g. nitrogen, oxygen)
Phosphorus
Sulphur
Fullerenes (carbon) - 3What are the intermolecular forces between covalent molecular elements?London dispersion forces
- 4Name some covalent network elements.Diamond (carbon)
Carbon (graphite)
Boron
Silicon - 5Why do covalent networks have very high melting points?Many strong covalent bonds must be broken
- 6Why is carbon in the form of graphite an effective lubricant?Graphite is formed in layers which are held together by weak LDF's. The layers can easily move.
- 7Why can carbon in the form of graphite conduct?Each carbon forms 3 covalent bonds, the fourth outer electrom becomes delocalised.
- 8What are monatomic elements?Single atoms which are not bonded to neighbouring atoms.
- 9Name some monatomic elements.All of the noble gases
(e.g. helium, neon) - 10Why do noble gases have very low melting points?They are held together by weak LDF's which are easily broken.
- 11Why does sodium have a higher melting point than chlorine?To melt sodium strong metallic bonds must be broken, this requires lot's of energy.
On the other hand, chlorine molecules are held together by weak London dispersion forces, so they can be easily separated.
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- Descripción
- Higher (Unit 1: Chemical Changes and Structure) Chemistry Fichas sobre Structure and bonding in the first 20 elements , creado por Lana Duncan el 04/04/2016.
- Creado por
- Lana Duncan
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