Covalent Bonding

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A level Chemistry (2.2 Electrons, Bonding and Structure) Flashcards on Covalent Bonding, created by Yinka F on 20/02/2018.
Yinka F
Flashcards by Yinka F, updated more than 1 year ago
Yinka F
Created by Yinka F over 6 years ago
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Question Answer
Define covalent bond The strong electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atoms
What is a dative covalent bond? In dative covalent (coordinate) bonding, one of the atoms provides both of the shared electrons
TRUE OR FALSE: Some compounds have less than 8 electrons in their outer shell, whilst some have more than 8 TRUE
Give an example of a compound with fewer than 8 electrons in their outer shell In boron trifluoride, boron only has 6 electrons in its outer shell
Give an example of a compound with more than 8 electrons in their outer shell In sulphur hexafluoride, sulphur has 12 electrons in its outer shell. This is known as 'expanding the octet'.
TRUE OR FALSE: All covalent bonds are the same strength FALSE Not all covalent bonds are the same strength
What determines the strength of a covalent bond? Covalent bond strength differ depending on how much the outer atomic orbitals of the bonded atoms overlap, and how strongly the atomic nuclei are attracted to the shared electrons
What does the average bond enthalpy measure? The average bond enthalpy measures the energy required to break a covalent bond
What happens to the average bond enthalpy when bond strength increases? The stronger a bond is, the more energy is required to break it, and so the greater the value of the average bond enthalpy
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