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Chapter 8
Chapter 8, Covalent Bonding: vocab and key ideas
Question | Answer |
---|---|
Atoms that are held together by sharing electrons are joined by what kind of bond? | covalent bond |
What is a molecule? | is a natural group of atoms joined together by covalent bonds. |
An oxygen molecule is an example of what? | diatonic molecule |
What is a compound composed of molecules called? | a molecular compound |
A molecular formula is what? | the chemical formula of a molecular compound. |
What does a molcular formula show? | how many atoms of each element a substance contains. |
What is the representative unit for an ionic compound? | a formula unit |
In covalent bonds, why does electron sharing usually occur? | so that atoms attain the electron configurations of noble gases. |
What does a structural formula represent? | the covalent bonds as dashes, and shows the arrangment of covalently bonded atoms. |
A pair of valence electrons that is not shared between atoms is called what? | unshared pair |
Define: double covalent bond | a bond that involves two shared pairs of electrons. |
What is a bond sharing three pairs of electrons called? | triple covalent bond |
A covalent bond in which one atom contributes both bonding electrons is called what? | coordinate covalent bond |
In a coordinate covalent bond, the shared electron pair comes from where? | from one of the bonding atoms. |
Ehat is a polyatomic ion? | a tightly bound group of atoms that has a positive or negative charge and behaves as a unit. |
The energy required to break the bond between two covalently bonded atoms is know as what? | bond dissociation energy |
A large bond dissociation energy corresponds to a _____ covalent bond. | strong |
What are resonance structures? | structures that occur when it is possible to draw two or more valid electrons dot structures that have the same number of electron pairs for a molecule or ion. |