Covalent structures and bonding
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Sorted FAQs on Covalent Structures and Bonding
This topic has attracted quite a lot of questions to React over the years. To help you find the ones of most interest to you more easily, whether they are about background theory or a particular experiment, we have sorted the FAQs under several headings below, with a direct link to each question and answer.
1. Properties
•Why CO2 a gas but SiO2 a solid?
•Does a sigma bond arise only from s-orbital overalap?
•Difference in M.Pts. of red and white P in terms of structure & bonding
•Properties of a polymeric, covalent molecule?
•Why is rock salt harder than sugar?
•Properties of low density poly(ethene) related to structure
2. Shapes
•Shape of thiosulphate ion?
•Shapes: 3 shapes in ethanoic acid?
•Shapes: of NH2- and NH2+?
•Shape: explanation for bond angle in ethane
3. Types of bonds
•Types of bonds in hydrated sodium carbonate?
•Examples of bonding trend ionic -> covalent?
•What type of compound is carbon dioxide?
•Type of bonding in nitric acid?
•Why M.Pt. MgO > M.Pt. SiO2
•C-X bond strength in haloalkanes?
•Bonding in Ca2+ - EDTA complex?
•Bonding in HCl and HNO3?
•Types of bonds in alkanes and alkenes?
•Types of bonds in diatomic molecules?
•Why is methane a covalent molecule?
4. Electrons
•Why BF3 not BF4?
•Why does PF5 have 10 outer electrons?
•Why does Be only have 4 electrons in BeCl2?
•How can S in SO3 have 12 outer electrons?
5. Miscellaneous
•Why is Kekule structure for benzene used for mechanisms?
•Why are bonds in P4 'strained'?
•Why does an electric field deflect streams of some liquids
•What needed to know about multiple bonds for AS?
•Directional and non-directional forces - covalent vs ionic?
•Meaning of 'polar compound'?
•What are van der Waals' and covalent radii?
•Structure of H2O2?
•Drawing dot & cross (Lewis) diagrams
•Displayed formula for MgSO4?
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updated: 27 September 2007
