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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
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covalent bond |
The chemical bond formed when two atoms share electrons. |
A water molecule has two covalent bonds. |
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molecule |
A neutral group of atoms joined by covalent bonds. |
A water molecule is an oxygen atom with two covalent bonds with hydrogen. |
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double bond |
Two atoms share two pairs of electrons. |
Oxygen forms a double bond with itself. |
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triple bond |
Atoms that share three pairs of electrons. |
Nitrogen can form a triple bond because it has 3 painless electrons. |
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molecular compound |
A compound composed of molecules. |
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polar bond |
Electrons shared unequally in a covalent bond. |
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nonpolar bond |
A covalent bond in which electrons are shared equally. |
Flourine's remaining electrons form a pair in a nonpolar bond. |
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alloy |
Mixture of two or more elements, at least one of which is a metal. |
Arsenic is sometimes used to strengthen alloys. |
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metallic bond |
Attraction between a positive metal ion and many electrons surrounding it. |
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What holds covalently bonded atoms together? |
The force that holds atoms together in a covalent bond is the attraction of each atom's nucleus for the shared pair of electrons. |
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What are the properties of molecular compounds? |
Compared to ionic compounds, molecular compounds generally have lower melting points and boiling points. And, unlike ionic compounds, molecular compounds don't conduct electric current when melted or dissolved in water. |
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How does unequal spring of electrons affect molecules? |
Unequal sharing of electrons causes the bonded atoms to have slight electrical charges. |
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How do the properties of metals and alloys compare? |
Alloys are generally stronger and less reactive than the metals from which they were made. |
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How do metal atoms combine? |
Metals atoms combine in regular patterns in which the valence electrons are free to move from atom to atom. |
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How does metallic bonding result in useful properties of metals? |
The "seas of electrons" model of metallic bonding helps explain the malleability, ductility, luster, high electrical conductivity, and high thermal conductivity of solid metals. |
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