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21 Cards in this Set
- Front
- Back
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what kind of process is the breaking of a chemical bond
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endothermic
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what kind of process is the forming of a chemical bond
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exothermic
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when a chemical bond is formed, does the resulting compound have more or less PE than the substances formed from it and why?
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it has has PE b/c energy is always released when a bond is formed
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energy released and stability and why
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the great the energy released, the greater its stability bc if it is a greater number it takes that same number to break it apart which means its harder to break apart bc it needs more energy and so it is stable
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kernel
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all parts of the atom except the valence electrons-is positively charged
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metals and nonmetals losing and gaining electrons
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metals lose, nonmetals gain
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what kind of metal atoms does metallic boding occur between?
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few valence electrons and low ionization energies
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chracteristics of metals
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hgih melting and boiling pts
good electrical conductivity lust liquid at STP malleable |
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what kind of elements have crsyalline lattice through which electrons flow freely
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metals
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as electronegativity difference between teh bonds increases, ionic character...
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increases
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ionic and covalent and electronegativity
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greater than 1.7=ionic
less than 1.7=covalent |
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bonds and melting pts
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ionic=high
metallic=high covalent=low |
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bonds and electrical conductivity
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metallic bonds=good conductivity
ionic and molecular solids=not good ionic liquids/aqueous=good |
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hardness and bonds
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ionic and metallic=hard
covalent=soft |
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dipole
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polar molecule
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what are the only 3 elements hydrogen bonding occurs with?
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flurine, oxygen, and nitrogen
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what kind of elements have the sea of mobile electrons
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metals
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why does water have ushc a high boiling pt?
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its bonds are hydrogwen bonds
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what are covalent bonds often formed between
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two nonmetals atoms
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what are ionic bonds often foremd between
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a metal and a nonmetal
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dipole-dipole attraction
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the negative end of one dipole (polar molecule) and the positive end of another attract each other
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