5.3-4 covalent compounds and bonds Flashcards

1
Q

covalent bond

A

holds atoms together in a molecular compound by sharing electrons

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2
Q

molecule

A

neutral group of atoms joined by covalent bond

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3
Q

diatomic molecule

A

molecule made of 2 atoms

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4
Q

molecular compound

A

compound composed of molecules

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5
Q

molecular compound properties

A

-lower melting and boiling points than ionic compounds
-soft solids, liquids, or gases at toom temp
-not conductors of electricity

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6
Q

molecular formulas

A

shows how many atoms of an element a molecule contains
-indicated the number of atoms in a molecule
-doesn’t give structure

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7
Q

elements that exist only as compounds

A

HON Hal:
H2
O2
N2
F2
Cl2
Br2
I2

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8
Q

structural formula

A

shows arrangement of covalently bonded atoms

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9
Q

unshared pair

A

pair of electrons not shared between atoms

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10
Q

double covalent bond

A

bond formed by sharing two pairs of electrons

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11
Q

triple covalent bond

A

bond formed by sharing three pairs of electrons

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12
Q

coordinate covalent bond

A

covalent bond where one atom contributes both bonding electrons to the covalent bond

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13
Q

polyatomic ion

A

tightly bound group of atoms that has a charge and behaves as a unit

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14
Q

how can you tell which atom is the central atom in a lewis structure?

A

the one with the most unpaired electrons or the atom with the LOWEST ELECTRONEGATIVITY
-hydrogen and halogens cannot be central

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15
Q

what is irregular about oxygen in lewis structures?

A

-can only form up to two bonds
-generally doesn’t bond with itself

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