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chemistry Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

Bonding Ionic , Melting point

A

High:
* Many strong bonds in giant lattice
* Bonds must be broken to melt
* Lots of energy required to break bonds
* Higher charges on ions means higher melting point due to stronger attraction

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2
Q

Bonding Ionic , Description of bonding

A

Electrostatic attraction between positive and negative ions

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3
Q

Bonding Ionic Electrical conductivity When solid

A

When solid: No
* Ions not free to move

When molten / aqueous: Yes
* Ions free to move

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4
Q

What is the structural shape of metalic bonding ?

A

Giant lattice

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5
Q

metalic bonding desciption of bonding

A

Electrostatic attraction between positive ions and sea of delocalised electrons

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6
Q

metalic bonding melting point

A

High:
* Strong attraction between delocalised electrons and lattice of positive ions
* Lots of energy required to break bonds

Melting point affected by charge on positive ion and number of electrons donated to ‘sea’.

Group 1 not typical and have fairly low MP.

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7
Q

metalic bonding electric conductivity

A

Yes
* Delocalised electrons can move

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8
Q

Covalent
Simple molecules melting point

A

low * Weak intermolecular forces between molecules.
* Not much energy needed to overcome the intermolecular forces.

Bonds within molecules are strong but these are not broken when melting.

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9
Q

covalent simple structure ?

A

Electrostatic attraction between shared pair of electrons and nuclei of both atoms

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10
Q

covalent simple Electrical conductivity

A

no delocalized electrons to carry charges

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11
Q

describe Covalent Bonding giant lattice structure

A

Electrostatic attraction between shared pair of electrons and nuclei of both atoms

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12
Q

Covalent Bonding giant meting point

A

High:
* Many strong bonds in giant lattice
* Bonds must be broken to melt
* Lots of energy required to break bonds

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13
Q

Covalent Bonding giant Electrical conductivity

A

Electrical conductivity When solid: No
* Ions not free to move

When molten / aqueous: Yes
* Ions free to move Yes
* Delocalised electrons can move No
* No ions
* No delocalised electrons Most: No
* No ions
* No delocalised electrons
Specific examples: diamond, silicon dioxide

Graphite: Yes
* Each carbon only forms 3 bonds
* Delocalised electrons can move

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biology (10 decks)

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