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Chemical bonding and molecular structure class 11 ppt

After you enable Flash, refresh this page and the presentation should play. Get the plugin now. Toggle navigation. Help Preferences Sign up Log in. To view this presentation, you'll need to allow Flash. Click to allow Flash After you enable Flash, refresh this page and the presentation should play. View by Category Toggle navigation. Products Sold on our sister site CrystalGraphics. Description: Ionic bonds transfer of electrons. Covalent bonds sharing Diatomic Fluorine.

Hydrogen Chloride by the Octet Rule. Formation of Water by the Octet Rule Tags: bonding chapter chemical diatomic electronegative molecular structure. Latest Highest Rated. Ionic bonds transfer of electrons Covalent bonds sharing of electrons 3 Electronegativity The ability of an atom in a molecule to attract shared electrons to itself.

It gives us information about the strength of a bonding interaction.

Molecular Orbitals.ppt

When writing Lewis structures, satisfy octets first, then place electrons around elements having available d orbitals.

Reflects central idea that stability of a compound relates to noble gas electron configuration. C Complete octets on atoms other than hydrogen with remaining electrons. H 17 Multiple Covalent Bonds Double bonds Two pairs of shared electrons 18 Multiple Covalent Bonds Triple bonds Three pairs of shared electrons 19 Resonance Occurs when more than one valid Lewis structure can be written for a particular molecule.

These are resonance structures. The actual structure is an average of the resonance structures. Models can be physical as with this DNA model Models can be mathematical Models can be theoretical or philosophical 22 Fundamental Properties of Models A model does not equal reality. Models are oversimplifications, and are therefore often wrong.

Models become more complicated as they age. We must understand the underlying assumptions in a model so that we dont misuse it. Ionic compounds organize in a characteristic crystal lattice of alternating positive and negative ions. Put pairs as far apart as possible.After you enable Flash, refresh this page and the presentation should play.

Get the plugin now. Toggle navigation. Help Preferences Sign up Log in. To view this presentation, you'll need to allow Flash. Click to allow Flash After you enable Flash, refresh this page and the presentation should play. View by Category Toggle navigation. Products Sold on our sister site CrystalGraphics. Title: Chemical Bonding.

Description: Composed of elemental symbol dots representing the outer shell or valence electrons Diatomic Elements. Writing Lewis Dot Structures Tags: bonding chemical diatomic.

Latest Highest Rated. Earnest Rutherford 2 Lewis Electron Dot Structures For elements Composed of elemental symbol dots representing the outer shell or valence electrons For oxygen -- 3 Lewis Electron Dot Structures For ions Add or subtract dots for electrons gained or lost to form ion. For O2- 1s2 2s2 2p4 1s22s2sp6 4 Bonding Atoms like to have a full outer shell and will gain lose or share electrons to achieve a full outer shell Representative elements gain, lose, or share electrons to have 8 electrons in their outer shell corresponding to full s and p orbitals.

This is the octet rule. Na 1e? Mg2 2e? Anions Cl 1 e? These elements tend to gain electrons to form an octet 8 Ionic Bonds Bonds formed by the interaction of ions and the strong electrostatic forces that hold them together. Ions group together in ratios which balance their positive and negative charges?One Thought Forever. Ask a Question. Recent questions and answers in Chemical Bonding and Molecular Structure.

What do you mean by term bond order? Calculate the bond order of: N2, C2, H2, N2. What is Molecular Orbital Theory. With the help of energy levels in homonuclear diatomic orbitals, arrange the following. What is meant by hybridisation of atomic orbitals? Describe the hybridisation in case of PCl5.

chemical bonding and molecular structure class 11 ppt

Why are the axial bonds longer as compared to equatorial bonds? Explain the formation of H2 molecule on the basis of Valence Bond Theory. Draw diagrams showing the formation of a triple bond between carbon atoms in C2H2 molecule.

Explain the factors affecting bond length. What do you understand by polar covalent bond. Explain with example. Explain any four factors which affect the solubility of ionic compounds. BaSO4 is ah ionic compound, yet it is insoluble in water. Dipole moment of CO2 molecule is zero where as SO2 has some dipole moment. Explain the reason. Write the important conditions required for the linear combination of atomic orbitals to form molecular orbitals.

Distinguish between a sigma and a pi bond. Which out of NH3 and NF3 has higher dipole moment and why? Which of the following pairs are more covalent and why? Define octet rule. Write its significance and limitations.These notes are prepared keeping in mind the level of preparation needed by the students to prepare for Class 11 exams. Chemical Bonding and Molecular Structure Class 11 Notes aims at easing out the student's learning and revision process.

In the periodic table, the highly electronegative halogens and the highly electro-positive alkali metals are separated by noble gases. Formation of an anion and cation by the halogens and alkali metals are formed by gain of electron and loss of electron respectively. Both the negative and positive ions acquire the noble gas configuration. The negative and positive ions are stabilized by electrostatic attraction. Forgot Password? OTP has been sent to you on your mobile number.

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Chemical Bonding - PowerPoint PPT Presentation

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chemical bonding and molecular structure class 11 ppt

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chemical bonding and molecular structure class 11 ppt

Class 10th. Class 12th. Class 11th. Class 9th. Mandhan Academy. Chartered Accountant. Certified Management Accountant. Company Secretary. Spoken English. Computer Skills. UP Bihar. Class 6. Class 7. Class 8.In contrast, your organic chemistry instructors will present a course in which each new topic uses information from previous topics to raise your understanding of organic chemistry to successively higher levels.

Multiple Choice: 2—5 Identify forces that are involved in chemical bonding. Chapter 7. Which acid listed on the right cannot be obtained by adding water to the substance on the left? O use two valence electrons for covalent bonding, so to achieve octet 5A elements e. It explains how an ion is created through the processes of oxidation and reduction. Chemistry Class 11 Important Questions are very helpful to score high marks in board exams. Mulliken came up with theory known as Molecular Orbital Theory to explain questions like above.

As you are aware, matter is made up of atoms, and therefore an understanding of the structure of atom is very important. Octet Rule: Atoms form chemical bonds in order to complete their octet i.

This text is an atoms-first adaptation of OpenStax Chemistry 2e. F have one valence electron for covalent bonding, so to achieve octet 6A elements e. Why is knowledge of chemical bonding important? Chemists can use the theory of structure and bonding to explain the physical and chemical properties of materials of widely varying composition e.

Greater the bond order, shorter is the bond length. Finish PPT on Reading a formula with subscripts, coefficients and parentheses, understanding molecular and empirical formulas. Its molecular formula is BH 3 O 3, and its molar mass is Here they are shown in a ball-and-stick model left. Class presentation to take notes and put into notebook: Topic 4.

Add 1 electron for each negative charge and subtract 1 electron for each positive charge. When ice melts, the structure breaks down and the molecules tend to fill up this wasted space.

DAY 3. Nature of Molecules Atom basic structural unit of matter. More the resonating structure more stable the molecule becomes. Slide8: Hydrogen molecule, H2 Concentration of negative charge between two nuclei occurs in a covalent bond 7A elements e. Molecular Structure. The bonding that is broken when you do electrolysis splitting of water molecules to form hydrogen and oxygen is … In the same way, the formation of oxygen molecule involves 1 Chemical Bonding - Free download as Powerpoint Presentation.Do you need help with your Homework?

Are you preparing for Exams? Study without Internet Offline. Download pdf for free! Loading More Solutions Get this solution now! Download our free PDF or App.

Get Solution now! Chapter 1 - Some Basic Concepts of Chemistry. Chapter 2 - Structure of Atom. Chapter 3 - Classification of Elements and Periodicity in Properties.

Chapter 5 - States of Matter. Chapter 6 - Thermodynamics. Chapter 7 - Equilibrium. Chapter 8 - Redox Reactions. Chapter 10 - The s-Block Elements. Chapter 11 - The p-Block Elements. Chapter 13 - Hydrocarbons. Class 11 Maths Revision Notes. Class 11 Physics Revision Notes. Register now. NEET Class 6. Class 7. Class 8. Class 9. Class Maharashtra Board. Micro Courses.

State Board. Study Material. Previous Year Papers. Mock Tests. Sample Papers. Reference Book Solutions. ICSE Solutions. School Syllabus. Revision Notes. Important Questions.Orbitals An approach to bonding in which orbitals encompass the entire molecule, rather than being localized between atoms.

Molecular Orbitals Molecular orbitals result from the combination of atomic orbitals. Since orbitals are wave functions, they can combine either constructively forming a bonding molecular orbitalor destructively forming an antibonding molecular orbital. Molecular Orbitals Molecular orbitals form when atomic orbitals with similar energies and proper symmetry can overlap. Atomic orbitals with differing energies or the wrong spatial orientation orthogonal do not combine, and are called non-bonding orbitals.

Need for MO Theory Valence bond theory fails to explain the bonding in many simple molecules. The oxygen molecule has a bond length and strength consistent with a double bond, and it contains two unpaired electrons. Need for MO Theory Valence bond theory predicts the double bond, but not the paramagnetism of oxygen. Need for MO Theory Resonance is another example of the limitations of valence bond theory. Bond lengths and strengths are intermediate between single, double or triple bonds.

Molecular orbital theory is often a better approach to use with molecules that have extended systems. Molecular Orbital Theory In order to simplify things, well consider the interaction of the orbitals containing valence electrons to create molecular orbitals.

The wave functions of hydrogen atom A and hydrogen atom B can interact either constructively or destructively. Molecular Orbital Theory The bonding orbital results in increased electron density between the two nuclei, and is of lower energy than the two separate atomic orbitals. Molecular Orbital Theory The antibonding orbital results in a node between the two nuclei, and is of greater energy than the two separate atomic orbitals.

Molecular Orbital Theory The result is an energy level diagram with the bonding orbital occupied by a pair of electrons. The filling of the lower molecular orbital indicates that the molecule is stable compared to the two individual atoms.

The strength of the bond depends upon the degree of orbital overlap. Experimental Evidence Photoelectron spectroscopy PES is a technique in which a beam of ultraviolet light with an energy of 21 eV is used to irradiate molecules. The energy is high enough to eject electrons. The kinetic energy of the emitted electrons is measured, and used to determine the energy level of the electron.

Experimental Evidence The technique allows for the measurement of specific ionization energies I. Each ionization energy represents the removal of an electron from a specific molecular orbital. Experimental Evidence Electrons in lower energy levels require more energy to be removed, and are ejected with less kinetic energy.

Period 2 Diatomic Molecules For the second period, assume that, due to a better energy match, s orbitals combine with s orbitals, and p orbitals combine with p orbitals. The symmetry of p orbitals permits end-on-end overlap along the bond axis, or side-by-side overlap around, but not along, the internuclear axis. With the x axis as the bond axis, the px orbitals may combine constructively or destructively.

The result is a bonding orbital and a anti-bonding orbital. The designation indicates symmetric electron density around the internuclear x axis.

Some texts will use the symmetry designations of g gerade or u ungerade instead of indicating bonding or anti-bonding. For these orbitals, the bonding orbital is gerade, or symmetric around the bond axis. For these orbitals, the anti-bonding orbital is asymmetric about the bond axis, and is designated as u.

Note that the designations of u or g do not correlate with bonding or anti-bonding. The orbital overlap side-by-side is less than that of overlap along the bond axis end-onend.

As a result, the bonding orbital will be higher in energy than the previous example.


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