chem quiz

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atoms

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24 Terms

1

atoms

only noble gas elements exist this way in nature

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2

ionic bonds

transfer of electrons

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3

metallic bonds

sea of electrons within a metal

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4

covalent bonds

share electrons

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5

characteristics of covalent bonds

formed by two non-metals, generally low melting/boiling point, can be solid liquid gas,

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6

compounds for covalent bonds are called....

molecules

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7

what is the chemical formula called

molecular formula

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8

lewis structure

model to show how atoms are arranged and bonded

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9

diatomic molecules

special kind of molecular compound in which two of the same atom are joined by a covalent bond

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10

molecular formula

the chemical formula of a molecular compound

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11

octet rule for covalent bonding

electron sharing tends to occur so that atoms, with shared electrons included, attain a full outer shell

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12

exceptions to the octet rule

hydrogen and helium want 2 electrons, beryllium is okay with 4, and boron is ok with 6

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13

shared pair of electrons

bonding pair between two atoms, represented by a line

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14

inshared pair of electrons

pair of valence electrons not shared, represented by two dots

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15

single covalent bond

two atoms held together by the sharing of one pair of electrons

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16

doube covalent bond

two atoms share two pairs of electrons

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17

triple covalent bond

two atoms share 3 pairs of electrons

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18

bond dissociation energy

total energy required to break the bond between two covalently bonded atoms

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19

shorter the bond length _______ the bond

stronger

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20

large energy=

strong bond

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21

carbon can bond to other carbon atoms to form

long chains, branched chains, and ring structure

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22

polyatomic ions

tightly bound group of atoms that have a positive or negative charge and behave as a unit

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23

resonance structure

when it is possible to have 2 or more valid electron dot structures

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24

excpetions to the octet rule

some atoms will eccept more than 8 outer electrons, phosphorus excepts 10 and sulfur excepts 12

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