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Инфоурок / Химия / Презентации / Презентация по химии на тему "Химические связи" (8,9,10 класс)

Презентация по химии на тему "Химические связи" (8,9,10 класс)

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  • Химия
CHEMICAL BONDS
INDEX INTRODUCTION ELECTRONEGATIVITY CHEMICAL BONDS AND THEIR FORMATION HYBRI...
CHEMICAL BONDS Intramolecular Intermolecular Ionic bond Covalent Bond Polar N...
The force of attraction that holds atoms or ions together is called a chemica...
During the process of forming a chemical bond, energy is given out. This ener...
ELECTRONEGATIVITY First proposed in 1934 by American physicist R.S. Mulliken....
Electronegativity decreases from top to bottom in a group and increases from...
CHEMICAL BONDS AND THEIR FORMATION The noble gases (He, Ne, Ar, Kr, Xe and Rn...
The tendency of atoms to make the number of their valence electrons eight, li...
e e e e e e e Na K Mg O Cl He Ne Ar Kr
Orbital Representation of Chemical Bonds: The electron configuration of fluor...
Fluorine molecule, F2:
Electron Dot Representation (Lewis Symbol) of Chemical Bonds: Electron dot re...
Gilbert Newton Lewis (1875 -1946): Lewis was an American scientist born in 18...
The Line Representation of Chemical Bonds: Two electrons (:) are shown by a l...
IONIC BONDS Formed by the transfer of electrons Formed between atoms that hav...
To complete their octets, sodium gives one electron to chlorine. Na+ cation a...
COVALENT BONDS Formed as a result of electron sharing Generally formed betwee...
Nonpolar Covalent Bonds Formed between two atoms with the same electronegativ...
Polar Covalent Bonds Formed between two atoms with different electronegativit...
Coordinate Covalent Bonds Both of the shared electrons come from only one of...
HYBRIDIZATION The mixing of orbitals from different energy levels to form new...
Unhybridized ground state hybridized excited state sp hybridization sp hybrid...
BeH2 molecule 4Be : 1s2 2s1 2p1 1H : 1s1
Unhybridized ground state 5B : 1s2 2s2 2p1 5B : 1s2 2s1 2p2 hybridized excite...
BH3 molecule 5B : 1s2 2s1 2p2 1H : 1s1
All angles are 120 degrees.
Unhybridized ground state hybridized excited state sp3 hybridization 6C : 1s2...
CH4 molecule 6C : 1s2 2s1 2p3 1H : 1s1
All angles are 109.5 degrees
COVALENT BONDING CAPACITY OF THE SECOND ROW ELEMENTS The number of unpaired v...
Bonding Capacity of Lithium: Lithium is a metal so it tends to form bonds wit...
Bonding Capacity of Beryllium : The electron configuration of Be is 1s22s2 it...
4Be : 1s2 2s1 2p1 Bonds : Polar Molecule: Nonpolar Shape : Linear 1H : 1s1
The direction of orbitals is linear. The shape of the BeH2 molecule.
Unhybridized ground state 5B : 1s2 2s2 2p1 5B : 1s2 2s1 2p2 hybridized excite...
BH3 molecule 5B : 1s2 2s1 2p2 Bonds : Polar Molecule: Nonpolar Shape : trigon...
The shape of the BH3 molecule. Orientation of orbitals is trigonal planar.
Unhybridized ground state hybridized excited state Bonding Capacity of Carbon...
CH4 molecule 6C : 1s2 2s1 2p3 Bonds : Polar Molecule: Nonpolar Shape : Tetrah...
The shape of the CH4 molecule.
Bonding Capacity of Nitrogen: Bonds : Polar Molecule: Polar Shape : Trigonal...
The orientation of the orbitals in the NH3 molecule is trigonal pyramidal. Th...
Bonding Capacity of Oxygen: Bonds : Polar Molecule: Polar Shape : Angular,ben...
The orientation of the orbitals in the H2O molecule. The shape of the H2O mol...
Bonding Capacity of Fluorine: Bonds : Polar Molecule: Polar Shape : Linear 9F...
Distribution of bonding electrons in the HF molecule.
Fluorine can form molecules with eachother Bonds : Nonpolar Molecule: Nonpola...
Bonding Capacity of Neon: Has eight valence electrons and all of them are pai...
DOUBLE AND TRIPLE COVALENT BONDS Some atoms(C,O,N…) can form double or triple...
Japanese scientist Prof. Dr. Masaru Emoto in his book “Water crystals” where...
SIGMA (σ) BONDS Formed by the end to end overlap of two orbitals. Overlap can...
Pi (π) BONDS Formed by the side by side overlap of two parallel p orbitals. T...
In the C2H4 molecule, unhybridized p orbitals overlap in side by side and for...
In the C2H2 molecule, unhybridized p orbitals form two π bonds by overlapping...
RESONANCE STRUCTURES If the valence electrons in a molecule are capable of se...
The structure of the ozone molecule
EXCEPTIONS TO THE OCTET RULE Most atoms complete their valence shell with eig...
ELECTRON DEFICIENCY Beryllium and boron do not complete their octet in their...
EXPANDED OCTETS Some atoms in 3rd period may have more than eight electrons i...
Orbital orientation in PF5 the molecule is trigonal bipyramidal Molecular mod...
FREE RADICALS Compounds that have unpaired electrons in their structures are...
1 из 92

Описание презентации по отдельным слайдам:

№ слайда 1 CHEMICAL BONDS
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CHEMICAL BONDS

№ слайда 2 INDEX INTRODUCTION ELECTRONEGATIVITY CHEMICAL BONDS AND THEIR FORMATION HYBRI
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INDEX INTRODUCTION ELECTRONEGATIVITY CHEMICAL BONDS AND THEIR FORMATION HYBRIDATION COVALENT BONDING CAPACITIY OF THE SECOND ROW ELEMENTS DOUBLE AND TRIPLE BONDS RESONANCE STRUCTURES EXCEPTIONS TO THE OCTET RULE

№ слайда 3 CHEMICAL BONDS Intramolecular Intermolecular Ionic bond Covalent Bond Polar N
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CHEMICAL BONDS Intramolecular Intermolecular Ionic bond Covalent Bond Polar Nonpolar Coordinate Between same atoms Between molecules Metallic Bond Crystal structure Van Der Waals Hydrogen Dipole-Dipole Van Der Waals

№ слайда 4 The force of attraction that holds atoms or ions together is called a chemica
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The force of attraction that holds atoms or ions together is called a chemical bond. INTRODUCTION

№ слайда 5 During the process of forming a chemical bond, energy is given out. This ener
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During the process of forming a chemical bond, energy is given out. This energy is equal to that required to break the same chemical bond. To gain a better understanding of chemical bonds we need to study electronegativity. Electronegativity plays an important role in bond formation.

№ слайда 6 ELECTRONEGATIVITY First proposed in 1934 by American physicist R.S. Mulliken.
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ELECTRONEGATIVITY First proposed in 1934 by American physicist R.S. Mulliken. Electronegativity is the tendency of an atom to attract the bonding electrons within a compound to itself. Depends upon the nuclear charge (proton number) and the atomic radius of the atom.

№ слайда 7 Electronegativity decreases from top to bottom in a group and increases from
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Electronegativity decreases from top to bottom in a group and increases from left to right across a period.

№ слайда 8 CHEMICAL BONDS AND THEIR FORMATION The noble gases (He, Ne, Ar, Kr, Xe and Rn
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CHEMICAL BONDS AND THEIR FORMATION The noble gases (He, Ne, Ar, Kr, Xe and Rn) which form group 8A in the periodic table are the most stable elements. They all have the ns2 np6 electron configuration (except He which has the 1s2 configuration).

№ слайда 9 The tendency of atoms to make the number of their valence electrons eight, li
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The tendency of atoms to make the number of their valence electrons eight, like the nobel gases, is known as the octet rule. There are two ways for the elements to gain their octet and obtain a noble gas electron configuration. 1. Electron transfer (creates an ionic bond) 2. Electron sharing (creates an covalent bond)

№ слайда 10 e e e e e e e Na K Mg O Cl He Ne Ar Kr
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e e e e e e e Na K Mg O Cl He Ne Ar Kr

№ слайда 11 Orbital Representation of Chemical Bonds: The electron configuration of fluor
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Orbital Representation of Chemical Bonds: The electron configuration of fluorine is 1s22s22p5

№ слайда 12 Fluorine molecule, F2:
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Fluorine molecule, F2:

№ слайда 13 Electron Dot Representation (Lewis Symbol) of Chemical Bonds: Electron dot re
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Electron Dot Representation (Lewis Symbol) of Chemical Bonds: Electron dot representation of fluorine atom is When two fluorine atoms combine with each other a F2 molecule forms.

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№ слайда 15
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№ слайда 16 Gilbert Newton Lewis (1875 -1946): Lewis was an American scientist born in 18
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Gilbert Newton Lewis (1875 -1946): Lewis was an American scientist born in 1875, in Massachusetts USA. He started this academic career in 1912 and proposed the theory of electron sharing in 1916 which as we have seen is of great importance to chemists. Because of this theory “electron dot representation” is also named “Lewis dot structure”.

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№ слайда 18 The Line Representation of Chemical Bonds: Two electrons (:) are shown by a l
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The Line Representation of Chemical Bonds: Two electrons (:) are shown by a line (–). The line representation of fluorine molecule is;

№ слайда 19 IONIC BONDS Formed by the transfer of electrons Formed between atoms that hav
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IONIC BONDS Formed by the transfer of electrons Formed between atoms that have an electronegativity difference greater than about 1.7

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№ слайда 21 To complete their octets, sodium gives one electron to chlorine. Na+ cation a
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To complete their octets, sodium gives one electron to chlorine. Na+ cation and Cl- anion are formed. and An ionic bond is formed between the sodium and chlorine ions.

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№ слайда 24
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№ слайда 25
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№ слайда 26 COVALENT BONDS Formed as a result of electron sharing Generally formed betwee
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COVALENT BONDS Formed as a result of electron sharing Generally formed between two nonmetals Covalent bonds can be classified into three groups nonpolar, polar and coordinate covalent bonds.

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№ слайда 29
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№ слайда 30 Nonpolar Covalent Bonds Formed between two atoms with the same electronegativ
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Nonpolar Covalent Bonds Formed between two atoms with the same electronegativity values. For example; H2, N2 , Cl2 and O2 molecules The electronegativity difference between the atoms which form the bond is zero The charge distribution within the bond is equal.

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№ слайда 32 Polar Covalent Bonds Formed between two atoms with different electronegativit
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Polar Covalent Bonds Formed between two atoms with different electronegativity values. For example; HCl, HI, HF… Electronegativity value of hydrogen is 2.1 Electronegativity value chloride is 3.0 Electronegativity difference is 0.9 which is smaller than 1.7

№ слайда 33
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№ слайда 34
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№ слайда 35
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№ слайда 36
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№ слайда 37 Coordinate Covalent Bonds Both of the shared electrons come from only one of
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Coordinate Covalent Bonds Both of the shared electrons come from only one of the atoms

№ слайда 38 HYBRIDIZATION The mixing of orbitals from different energy levels to form new
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HYBRIDIZATION The mixing of orbitals from different energy levels to form new orbitals all with the same energy is called hybridization. The new orbitals formed at this new energy level are called hybrid orbitals. There are three types of hybridization between `s` and `p`orbitals which are sp,sp2,sp3.

№ слайда 39 Unhybridized ground state hybridized excited state sp hybridization sp hybrid
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Unhybridized ground state hybridized excited state sp hybridization sp hybrid orbitals are formed as a result of mixing one s orbital with one p orbital. 4Be : 1s2 2s2 2p0 4Be : 1s2 2s1 2p1

№ слайда 40 BeH2 molecule 4Be : 1s2 2s1 2p1 1H : 1s1
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BeH2 molecule 4Be : 1s2 2s1 2p1 1H : 1s1

№ слайда 41
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№ слайда 42
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№ слайда 43 Unhybridized ground state 5B : 1s2 2s2 2p1 5B : 1s2 2s1 2p2 hybridized excite
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Unhybridized ground state 5B : 1s2 2s2 2p1 5B : 1s2 2s1 2p2 hybridized excited state sp2 hybridization sp2 hybrid orbitals are formed as a result of mixing one s orbital with two p orbitals.

№ слайда 44 BH3 molecule 5B : 1s2 2s1 2p2 1H : 1s1
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BH3 molecule 5B : 1s2 2s1 2p2 1H : 1s1

№ слайда 45 All angles are 120 degrees.
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All angles are 120 degrees.

№ слайда 46
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№ слайда 47 Unhybridized ground state hybridized excited state sp3 hybridization 6C : 1s2
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Unhybridized ground state hybridized excited state sp3 hybridization 6C : 1s2 2s2 2p2 6C : 1s2 2s1 2p3

№ слайда 48 CH4 molecule 6C : 1s2 2s1 2p3 1H : 1s1
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CH4 molecule 6C : 1s2 2s1 2p3 1H : 1s1

№ слайда 49 All angles are 109.5 degrees
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All angles are 109.5 degrees

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№ слайда 51
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№ слайда 52 COVALENT BONDING CAPACITY OF THE SECOND ROW ELEMENTS The number of unpaired v
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COVALENT BONDING CAPACITY OF THE SECOND ROW ELEMENTS The number of unpaired valence electrons of an element shows the covalent bonds of that element. The number of half-filled orbitals indicates the number of bonds that the atoms can form.

№ слайда 53 Bonding Capacity of Lithium: Lithium is a metal so it tends to form bonds wit
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Bonding Capacity of Lithium: Lithium is a metal so it tends to form bonds with nonmetals. The compound lithium hydride, LiH, is made up of crystals with cubic lattice structure. 1H : 1s1 Bonds : Polar Molecule: Polar Shape : Linear 3Li : 1s2 2s1

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№ слайда 55 Bonding Capacity of Beryllium : The electron configuration of Be is 1s22s2 it
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Bonding Capacity of Beryllium : The electron configuration of Be is 1s22s2 it has two valence electrons in its ground state. It shouldn't be able to form a covalent bond as the electrons are paired. Unhybridized ground state hybridized excited state 4Be : 1s2 2s2 2p0 4Be : 1s2 2s1 2p1

№ слайда 56 4Be : 1s2 2s1 2p1 Bonds : Polar Molecule: Nonpolar Shape : Linear 1H : 1s1
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4Be : 1s2 2s1 2p1 Bonds : Polar Molecule: Nonpolar Shape : Linear 1H : 1s1

№ слайда 57 The direction of orbitals is linear. The shape of the BeH2 molecule.
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The direction of orbitals is linear. The shape of the BeH2 molecule.

№ слайда 58 Unhybridized ground state 5B : 1s2 2s2 2p1 5B : 1s2 2s1 2p2 hybridized excite
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Unhybridized ground state 5B : 1s2 2s2 2p1 5B : 1s2 2s1 2p2 hybridized excited state Bonding Capacity of Boron: Has three valence electrons, only one of them is unpaired in the ground state.

№ слайда 59 BH3 molecule 5B : 1s2 2s1 2p2 Bonds : Polar Molecule: Nonpolar Shape : trigon
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BH3 molecule 5B : 1s2 2s1 2p2 Bonds : Polar Molecule: Nonpolar Shape : trigonal planar 1H : 1s1

№ слайда 60 The shape of the BH3 molecule. Orientation of orbitals is trigonal planar.
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The shape of the BH3 molecule. Orientation of orbitals is trigonal planar.

№ слайда 61 Unhybridized ground state hybridized excited state Bonding Capacity of Carbon
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Unhybridized ground state hybridized excited state Bonding Capacity of Carbon: Has four valence electrons, of which only two are unpaired in the ground state. 6C : 1s2 2s2 2p2 6C : 1s2 2s1 2p3

№ слайда 62 CH4 molecule 6C : 1s2 2s1 2p3 Bonds : Polar Molecule: Nonpolar Shape : Tetrah
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CH4 molecule 6C : 1s2 2s1 2p3 Bonds : Polar Molecule: Nonpolar Shape : Tetrahedral 1H : 1s1

№ слайда 63 The shape of the CH4 molecule.
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The shape of the CH4 molecule.

№ слайда 64 Bonding Capacity of Nitrogen: Bonds : Polar Molecule: Polar Shape : Trigonal
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Bonding Capacity of Nitrogen: Bonds : Polar Molecule: Polar Shape : Trigonal pyramidal Has five valence electrons. 1H : 1s1 7N : 1s2 2s2 2p3

№ слайда 65 The orientation of the orbitals in the NH3 molecule is trigonal pyramidal. Th
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The orientation of the orbitals in the NH3 molecule is trigonal pyramidal. The shape of the NH3molecule is trigonal pyramidal.

№ слайда 66
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№ слайда 67 Bonding Capacity of Oxygen: Bonds : Polar Molecule: Polar Shape : Angular,ben
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Bonding Capacity of Oxygen: Bonds : Polar Molecule: Polar Shape : Angular,bent 8O : 1s2 2s2 2p4 Has six valence electrons. 1H : 1s1

№ слайда 68 The orientation of the orbitals in the H2O molecule. The shape of the H2O mol
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The orientation of the orbitals in the H2O molecule. The shape of the H2O molecule

№ слайда 69 Bonding Capacity of Fluorine: Bonds : Polar Molecule: Polar Shape : Linear 9F
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Bonding Capacity of Fluorine: Bonds : Polar Molecule: Polar Shape : Linear 9F : 1s2 2s2 2p5 HF,HCl … Has seven valence electrons, only one of them is unpaired, so the fluorine atom can form one bond. 1H : 1s1

№ слайда 70 Distribution of bonding electrons in the HF molecule.
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Distribution of bonding electrons in the HF molecule.

№ слайда 71 Fluorine can form molecules with eachother Bonds : Nonpolar Molecule: Nonpola
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Fluorine can form molecules with eachother Bonds : Nonpolar Molecule: Nonpolar Shape : Linear 9F : 1s2 2s2 2p5 9F : 1s2 2s2 2p5 F2 , Cl2 …

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№ слайда 73
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№ слайда 74 Bonding Capacity of Neon: Has eight valence electrons and all of them are pai
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Bonding Capacity of Neon: Has eight valence electrons and all of them are paired. Neon is very unreactive and does not bond with any other element. Helium and argon are very unreactive. Krypton and xenon may form bonds under certain conditions.

№ слайда 75 DOUBLE AND TRIPLE COVALENT BONDS Some atoms(C,O,N…) can form double or triple
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DOUBLE AND TRIPLE COVALENT BONDS Some atoms(C,O,N…) can form double or triple bonds as well as single bonds. Two types of bonds may be formed when orbitals overlap which are sigma (σ) and pi (π) bonds. single bond is σ bond. double bond contains one σ and one π bond. triple bond contains one σ and two π bonds.

№ слайда 76 Japanese scientist Prof. Dr. Masaru Emoto in his book “Water crystals” where
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Japanese scientist Prof. Dr. Masaru Emoto in his book “Water crystals” where there are 70 pictures of crystals: Water is not a lifeless; it is composed of living and sensible crystals. Three years ago Emoto in his researches by microscope discovered that water crystals give different reactions to external influences. According to these researches, water crystals give reactions to music, word and concepts as well as influences of external environment.

№ слайда 77
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№ слайда 78 SIGMA (σ) BONDS Formed by the end to end overlap of two orbitals. Overlap can
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SIGMA (σ) BONDS Formed by the end to end overlap of two orbitals. Overlap can take place between s orbitals, p orbitals or hybrid orbitals. In methane there are 4 C-H sigma bonds whereas in ethane there are 6 C-H and 1 C-C, sigma bonds.

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№ слайда 80
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№ слайда 81 Pi (π) BONDS Formed by the side by side overlap of two parallel p orbitals. T
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Pi (π) BONDS Formed by the side by side overlap of two parallel p orbitals. The electron cloud lies above and below the plane formed by sigma(σ) bonds. Pi (π) bonds are weaker than σ bonds.

№ слайда 82
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№ слайда 83 In the C2H4 molecule, unhybridized p orbitals overlap in side by side and for
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In the C2H4 molecule, unhybridized p orbitals overlap in side by side and form a p bond.

№ слайда 84
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№ слайда 85 In the C2H2 molecule, unhybridized p orbitals form two π bonds by overlapping
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In the C2H2 molecule, unhybridized p orbitals form two π bonds by overlapping side by side.

№ слайда 86 RESONANCE STRUCTURES If the valence electrons in a molecule are capable of se
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RESONANCE STRUCTURES If the valence electrons in a molecule are capable of several alternative arrengements which differ only a small amount in energy each arrangement is called a resonance. The bonds in the ozone molecule, O3, are identical and have a length of 128 pm.

№ слайда 87 The structure of the ozone molecule
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The structure of the ozone molecule

№ слайда 88 EXCEPTIONS TO THE OCTET RULE Most atoms complete their valence shell with eig
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EXCEPTIONS TO THE OCTET RULE Most atoms complete their valence shell with eight (octet) electrons to become stable. However, some exceptions occur. ELECTRON DEFICIENCY EXPANDED OCTETS FREE RADICALS

№ слайда 89 ELECTRON DEFICIENCY Beryllium and boron do not complete their octet in their
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ELECTRON DEFICIENCY Beryllium and boron do not complete their octet in their covalent compounds because these atoms have less than four valence electrons.

№ слайда 90 EXPANDED OCTETS Some atoms in 3rd period may have more than eight electrons i
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EXPANDED OCTETS Some atoms in 3rd period may have more than eight electrons in their valence orbitals. Expanded octet in the PF5 molecule

№ слайда 91 Orbital orientation in PF5 the molecule is trigonal bipyramidal Molecular mod
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Orbital orientation in PF5 the molecule is trigonal bipyramidal Molecular model of PF5

№ слайда 92 FREE RADICALS Compounds that have unpaired electrons in their structures are
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FREE RADICALS Compounds that have unpaired electrons in their structures are called free radicals. NO and NO2 are two examples of free radicals. Free radicals are chemically active substances.

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Дата добавления 13.01.2016
Раздел Химия
Подраздел Презентации
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УЖЕ ЧЕРЕЗ 10 МИНУТ ВЫ МОЖЕТЕ ПОЛУЧИТЬ ДИПЛОМ

от проекта "Инфоурок" с указанием данных образовательной лицензии, что важно при прохождении аттестации.

Если Вы учитель или воспитатель, то можете прямо сейчас получить документ, подтверждающий Ваши профессиональные компетенции. Выдаваемые дипломы и сертификаты помогут Вам наполнить собственное портфолио и успешно пройти аттестацию.

Список всех тестов можно посмотреть тут - https://infourok.ru/tests


Включите уведомления прямо сейчас и мы сразу сообщим Вам о важных новостях. Не волнуйтесь, мы будем отправлять только самое главное.
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