gen chem 4th qrtr FINALS

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33 Terms

1

ions

Are charged species formed from the gain and/or loss of an electron/s of a neutral atom.

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2

anions

Are negatively charged ions,

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3

cations

Are positively charged ions.

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4

Electrons

When ions are formed, only the number of (???????) are changed, the number of ( Answer key #5 )  still remains the same for any atom.

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5

protons

When ions are formed, only the number of ( Answer key #4 ) are changed, the number of ( ? ???)  still remains the same for any atom.

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6

crystal lattice

The geometrical arrangement of the atoms, ions or molecules of the crystalline solid as points in space

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7

ionic bond

The bond that holds these ions together in the lattice is called the ( ????). These are stabilized by ( Answer key # 8 ) of attraction between the positively-charged cation and the negatively-charged anion.

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8

electrostatic forces

The bond that holds these ions together in the lattice is called the ( Answer key # 7 ). These are stabilized by ( ????? ) of attraction between the positively-charged cation and the negatively-charged anion.

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9

ionic compounds

Are compounds that are made of cations and anions assembled together in a crystal lattice.

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10

electrical neutrality

The most important consideration in writing the chemical formulas of ionic compounds is their ( ???? ).  When a cation and an anion combine, they must form an ionic compound with a net charge of zero.

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11

binary compound

Are compounds that contain only two types of elements.

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12

CATION

In writing Ionic Compound, you’ll name the ( ????? ) first?

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13

CRISSCROSS

You can use the ( ???? ) method in writing the chemical formula of ionic compounds.

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14

polyatomic ions

Are charged chemical species composed of two or more atoms that are covalently bonded to each other.

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15

latin

What naming system is used by taking the stem name of the element’s Latin name?

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16

stock

What naming system is used wherein the cation’s charge state is written as Roman numerals enclosed in parentheses beside the element’s name.

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17

covalent bond

Are compounds that are formed when two or more nonmetals form a bond with each other.

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18

covalent bond

The bond that holds these nonmetals together is stabilized by electron-sharing and is called a ( Answer key #18 ).

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19

octet rule

A full valence shell is often characterized by a complete set of eight electrons, which is why this phenomenon is often called the ( Answer key #19 ).

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20

deca-

Greek prefix of #10

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21

penta-

Greek prefix of #5

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22

tetra-

Greek prefix of #4

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23

tri-

Greek prefix of #3

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24

di-

Greek prefix of #2

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25

mono-

Greek prefix of #1

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26

nona-

Greek prefix of #9

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27

octa-

Greek prefix of #8

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28

hepta-

Greek prefix of #7

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29

hexa-

Greek prefix of #6

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30

Molar mass

 It is the mass of the substance per mole. It is often expressed in the unit grams per mole (g/mol).  For an element, the molar mass is numerically equivalent to its atomic mass.  For example, the atomic mass of a nitrogen atom is 14 amu, which means that nitrogen has a molar mass of 14 g/mol.  Note: Use the whole rounded off value of the atomic weights.

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31

Molecular mass

is defined as the sum of the atomic masses of all elements in a covalent compound.

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32

Chemical Formula

 The combination of elements that make a compound.

 Element symbols and numerical subscripts represent the number of each atom.

 The chemical formula follows the law of definite composition. It states that atoms combine in definite proportion by mass.

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33

Percentage Composition

 This refers to the ratio of the mass of an element and the mass of the compound, multiplied by 100.

 It is the composition of a compound based on the percentage of the elements that comprise it.

 It can be represented as the percent by mass of each element in a compound.

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