The Shapes of Molecules

Sep 05, 2012

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The Shapes of Molecules. 10.1 Depicting Molecules and Ions with Lewis Structures. 10.2 Using Lewis Structures and Bond Energies to Calculate Heats of Reaction. 10.3 Valence-Shell Electron-Pair Repulsion (VSEPR) Theory and Molecular Shape. 10.4 Molecular Shape and Molecular Pola

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The Shapes of Molecules

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7 – Shapes of Molecules & Intermolecular Forces

7 – Shapes of Molecules & Intermolecular Forces. Leaving Certificate Chemistry. Shapes of covalent Molecules. Using the Valence Shell Electron Pair Repulsion Theory. The shape of a molecule depends on the number of pairs of electrons in the outer shell of the central atom. 2007

917 views • 42 slides

Shapes of molecules

Shapes of molecules. BeH 2 Pairs bonded unbonded Draw the Lewis structure Shape nonPolar? Symmetry? Same atom?. 2 0 Linear Yes yes nonpolar. Group II A. BH 3 Pairs bonded unbonded Draw the Lewis structure Shape

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Shapes of Molecules

Shapes of Molecules. All shapes came from http :// www.chemmybear.com. VSEPR theory. Valence shell electron pair repulsion theory Simply stated it says- all atoms and electrons pairs will stay as far apart from one another as possible in 3-D space.

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Shapes of Molecules

Shapes of Molecules. Steric number of 5. Like PF 5 Phosphorus pentafluoride. F F F P F F . Would look like. This is called Trigonal Bipyramidal. Steric # 5 with unbonded pairs of electrons. With one pair of unbonded electrons it is a See-saw shape (SF 4 , IOF 4 )

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The Shapes of Molecules

The Shapes of Molecules. Year 12 Chemistry. Learning Outcomes. How to answer this question. Write: “The molecule has” then one of : 4 non-central atoms so the shape is tetrahedral because the 4 “ espeao “. (“electron sets push each other away.”)

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Shapes of molecules

Shapes of molecules. Why ICE floats on WATER ? ?. Why ICE floats on WATER ? ?. Question 2: . Why doesn’t ICE behave as most solid & sink ?. Question 3: . volume of ICE > volume of water ?. Question 4: . How would the shapes/structure of ICE affect its density ?.

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Shapes of Molecules

Shapes of Molecules. Learning objectives. Explain the shape of simple molecules based on repulsion of electron pairs around a central atom. Understand that lone pairs repel more than bonded pairs

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4.8 Shapes of Molecules

4.8 Shapes of Molecules. Determined by number of valence electrons of the central atom 3-D shape a result of bonded pairs and lone pairs of electrons Use VSEPR theory (valence-shell-electron-pair repulsion. Using the VSEPR Model. 1. Draw the electron-dot structure

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Molecular Geometry (Shapes of Molecules)

Molecular Geometry (Shapes of Molecules). VSEPR Theory CP Chemistry. http://www.scl.ameslab.gov/MacMolPlt/Surface.JPG. VSEPR Theory. Electron groups around the central atom will be most stable when they are as far apart as possible – we call this valence shell electron pair repulsion theory

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The Shapes of Molecules

The Shapes of Molecules. The steps to follow in converting a molecular formula into LEDS. 1 st : Place the atoms relative to each other. [Atom with the lowest electronegativity(EN)]

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Shapes & Polarity of Molecules

Shapes & Polarity of Molecules. Homework Review. 3.5 Based on the information in Fig. 2-14 on p. 103, state whether each of the following compounds is ionic or covalent. a) BrCl b) HCl c) KCl d) CaBr 2. Homework Review. 3.6

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Shapes of Molecules

Shapes of Molecules. Determined by number of valence electrons of the central atom 3-D shape a result of bonded pairs and lone pairs of electrons Use VSEPR theory (valence-shell-electron-pair repulsion. Using the VSEPR Model. 1. Draw the electron-dot structure Identify the central atom

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SHAPES OF MOLECULES

SHAPES OF MOLECULES. SHAPES OF MOLECULES. Before you start it would be helpful to… know the definition of a covalent bond know what a lone pair is know that like charges repel. Al. Al. ELECTRON PAIR REPULSION THEORY.

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1: Shapes of the molecules and ions

Date. 1: Shapes of the molecules and ions. BIG picture. What skills will you be developing this lesson? ICT Numeracy Literacy Team work Self management Creative thinking Independent enquiry Participation Reflection How is this lesson relevant to every day life? (WRL/CIT).

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Shapes of molecules & ions

Shapes of molecules & ions. VSEPR theory. VSEPR - the V alence S hell E lectron P air R epulsion theory is used to obtain the shape of simple molecules and ions. VSEPR theory.

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14.1 Shapes of molecules and ions (HL)

14.1 Shapes of molecules and ions (HL). 14.1.1 State and predict the shape and bond angles using the VSEPR theory for 5 and 6 negative charge centers. Molecules with more than 4 electron pairs. Molecules with more than 8 valence electrons [expanded valence shell]

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SHAPES OF MOLECULES

SHAPES OF MOLECULES. REMINDER ABOUT ELECTRONS. Electrons have negative charges Negative charges “repel” each other In molecules, electrons want to get as far away from each other as possible As a result, this repulsion of electrons leads to the shape of the molecule. SHAPE OF MOLECULES.

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Chapter 10 Shapes of Molecules

Chapter 10 Shapes of Molecules. The Three Dimensional Reality of Molecular Shapes. The Three Dimensional Reality of Molecular Shapes. Each atom, bonding e- pair, and lone e- pair has its own position in 3D space.

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Chapter 10 The Shapes of Molecules

Chapter 10 The Shapes of Molecules. The Shapes of Molecules. 10.1 Depicting Molecules and Ions with Lewis Structures. 10.2 Using Lewis Structures and Bond Energies to Calculate Heats of Reaction. 10.3 Valence-Shell Electron-Pair Repulsion (VSEPR)

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Shapes of Molecules

Shapes of Molecules. All shapes came from http://www.spusd.k12.ca.us/chemmybear/shapes.html. VSEPR theory. Valence shell electron pair repulsion theory Simply stated it says- all atoms and electrons pairs will stay as far apart from one another as possible in 3-D space.

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1: Shapes of the molecules and ions

861 views • 82 slides

Chapter 10 The Shapes of Molecules

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The Shapes of Molecules

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Presentation Transcript

7 – Shapes of Molecules &amp; Intermolecular Forces

Shapes of molecules

Shapes of Molecules

Shapes of Molecules

The Shapes of Molecules

Shapes of molecules

Shapes of Molecules

4.8 Shapes of Molecules

Molecular Geometry (Shapes of Molecules)

The Shapes of Molecules

Shapes &amp; Polarity of Molecules

Shapes of Molecules

SHAPES OF MOLECULES

1: Shapes of the molecules and ions

Shapes of molecules &amp; ions

14.1 Shapes of molecules and ions (HL)

SHAPES OF MOLECULES

Chapter 10 Shapes of Molecules

Chapter 10 The Shapes of Molecules

Shapes of Molecules

1: Shapes of the molecules and ions

Chapter 10 The Shapes of Molecules

7 – Shapes of Molecules & Intermolecular Forces

Shapes & Polarity of Molecules

Shapes of molecules & ions