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17 Cards in this Set
- Front
- Back
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What is a covalent bond? |
The strong electrostatic force of attraction between a shared pair of electrons and the nuclei of the bonded atoms. |
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What is a dative bond? |
A covalent bond where one of the atoms donated both electrons being shared |
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What is the same of a molecule determined by and why? |
By the number of bonding pairs and lone pairs, as electron pairs repel each other as far apart as possible |
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What is the name and angle of a molecule that has 2 bonding pairs? |
Linear- 180 degrees |
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What is the name and bonding angle of a molecule that has 3 bonding pairs? |
Trigonal planar- 120 degrees |
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What is the name and angle of a molecule that has 4 bonding pairs? |
Tetrahedral- 109.5 degrees |
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What is the name and angle of a molecule that has 6 bonding pairs? |
Octahedral- 90 degrees |
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Why is the same of a molecule affected by lone pairs? |
As lone pairs have a greater repulsive effect than bonding pairs |
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What is the name and angle of a molecule that has 3 bonding pairs and 1 lone pair? |
Pyramidal- 107 degrees |
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What is the name and angle of a molecule that has 2 bonding pairs and 2 lone pairs? |
Non-linear- 104.5 degrees |
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Definition of electro negativity. |
The ability of an atom to attract the boding electrons in a covalent bond |
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Are symmetrical molecules polar or non-polar? |
Non-polar |
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When does hydrogen bonding take place? |
When a hydrogen bonds go a nitrogen, oxygen or fluorine |
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Why does water have a higher boiling point than expected? |
Because strong hydrogen bonds holding the water molecules together require a lot of energy to break. |
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Why is ice less dense than water? |
Because hydrogen bonding holds the molecules far appear in an open lattice structure. |
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Why can giant ionic substances not conduct when solid? |
Because the ions are in fixed positions in the lattice and unable to move freely, so they cannot carry a current. |
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Why can giant ionic substances conduct when in solution? |
Because the ions are mobile. |
