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PBHS Chem I Ch 8
| Question | Answer |
|---|---|
| one of the characteristics of an ionic compound was that it had a ___________ melting point | very high |
| Covalent bonds: instead giving up or accepting electrons, the elements in these compounds play “tug of war” with the electrons, and end up _______________ the electrons | sharing |
| A ___________ is a neutral group of atoms joined together by covalent bonds | molecule |
| _________________ molecule: a molecule consisting of two atoms (usually the same atom). | Diatomic |
| A compound composed of molecules is called a _______________- | molecular compound |
| Molecular compounds have _________ melting and boiling points than ionic compounds | lower |
| Ionic compound is a metal bonded to a non-metal; molecular compound is usually made of two or more __________ | non-metals |
| A molecular formula is the _________________ of a molecular compound; shows how many atoms of each element a molecule contains | chemical formula |
| Formulas do not show ________________ | chemical structure |
| __________________ show the arrangement of atoms in a molecular compound | structural formulas |
| In forming covalent bonds, electron sharing usually occurs so that atoms attain the electron configuration of ___________; this is called the __________ rule | noble gases; octet |
| Two atoms held together by sharing a single pair of electrons are joined by a ___________________ | single covalent bond |
| the structural formula of a hydrogen molecule | H-H |
| A pair of valence electrons that is not shared between atoms is called an ___________________ | unshared pair |
| Atoms form ______________ covalent bonds if they can achieve noble gas structure by sharing two or three pairs of electrons | double or triple |
| structural formula of O2 | O=O |
| Carbon Dioxide CO2; has a ________________ between the carbon and each of the oxygens | double covalent bond |
| Carbon Monoxide (CO) is an example of a different type of covalent bonding Coordinate Covalent Bonding: one atom donates an unshared pair to the bond; This type of compound is said to have two ______________________ and one __________ | covalent bonds; coordinate bond |
| The energy required to break the bonds between two covalently bonded atoms is known as the __________________ | bond dissociation energy |
| A large bond dissociation energy corresponds to a ___________ covalent bond | strong |
| Ozone (O3) displays a single covalent bond and a coordinate covalent bond between the three oxygens; by moving a single electron pair you can shift where the two bonds occur… this is called a ___________________ | resonance structure |
| Two examples of exceptions to the octet rule are ___________ & ___________ | NO2 (Nitrogen Dioxide) & BF3 (Boron Trifluoride) |
| when two or more atoms combine into a molecular compound, their orbitals overlap forming _____________ which apply to the entire molecule | molecular orbitals |
| s-orbital + s-orbital forms a ___________ | sigma bond |
| When p-orbitals overlap side by side, a __________ type of orbital is formed | pi-bond |
| VSEPR stands for ___________ | Valence Shell Electron-Pair Repulsion |
| VSEPR Theory explains and illustrates the ________________ reality of molecules | three-dimensional |
Created by:
kcshiker
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