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Quimica > Chemical Bond > Flashcards

Chemical Bond Flashcards

1
Q

2 types of chemical bond

A

Ionic

Covalent

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2
Q

Ionic bond

A

Atom accepts or donates one or more valence electrons to another atom

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3
Q

Covalent atom

A

Atoms share valence electrons

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4
Q

If the electronegativity values of two atoms are similar

A

Metallic bonds form between two metal atoms
Covalent bongs form between two non metal atoms
….non polar when electronegativity very similar
….polar when are little further apart

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5
Q

If the electronegativity values of the two atoms are different

A

Ionic bonds are form

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6
Q

Electronegativity

A

Property of an atom which increases with its tendency to attract the electrons of a bond
Octet rule

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7
Q

Octet rule

A

Elements gain or lose electrons to attain an electron configuration of the nearest noble gas

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8
Q

Why do elements follow the octet rule

A

Because they always seek the most stable electron configuration
Results in completely filled s- and p orbitals in an atom’s outermost energy level

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9
Q

Los atomic weight elements

A

First 20 elements

Adhere the octet rule

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10
Q

Theory of chemical bonding

A

3

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11
Q

Why atoms form bonds

A

Stability
Energy
Octet rule

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12
Q

Why molecules have an specific geometry?

A

VSEPR

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13
Q

Why compounds have an specific chemical formula

A

Valence electrons

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14
Q

Chemical bonds 3 types

A

Ionic electrostatic attraction between ions
Covalent sharing of electrons
Metallic metal atoms bonded to several other atoms

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15
Q

Covalent bonding 3 electrostatic interactions

A

Attractions between electrons and nuclei
Repulsion between electrons
Repulsions between nuclei

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16
Q

Properties of ionic compounds

A

Form crystals
Have high melting point and boiling point
Hard and brittle
Conduct electricity when they are dissolved in water
Ionic solids are good insulators

17
Q

Types of covalent bonds

A

Polar

No polar

18
Q

Polar

A

Electron is more attracted to one atom than to another

Greater the difference in electronegativity the more polar is the bond

19
Q

Properties of covalent(molecular) compounds

A

Most have relatively low melting points and boiling point
Soft and flexible
More flammable
Dissolve in water don’t conduct electricity
Don’t dissolve well in water

20
Q

Co-ordinate bonding

A

Also as dative covalent
Is a covalent bond in which both electrons come from the same atom
CO
H2SO4

21
Q

Electron sea model

A

Metallic bonding in which cations are considered to be fixed points within a mobile sea of electrons

22
Q

Basic metals

A

Right of the transition metals

Quimica (4 decks)

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