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Chapter 13 Molecular Shapes. Molecular Shape Molecular shape or molecular geometry is the three-dimensional arrangement of the atoms in a molecule.

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Presentation on theme: "Chapter 13 Molecular Shapes. Molecular Shape Molecular shape or molecular geometry is the three-dimensional arrangement of the atoms in a molecule."— Presentation transcript:

1 Chapter 13 Molecular Shapes

2 Molecular Shape Molecular shape or molecular geometry is the three-dimensional arrangement of the atoms in a molecule.

3 Molecular Shape Molecular shape determines several properties of a substance including: –reactivity –polarity –phase of matter –color –magnetism –biological activity

4 Olfaction – sense of smell Lock-and-Key Theory: humans can smell various odors because each three- dimensional odor molecule fits into only one type of receptor.

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6 Gustation – the sense of taste Taste receptors are located on the tongue and are sensitive to four major tastes: salty, sweet, sour and bitter. Taste receptors respond differentially to the varying shapes of food and liquid molecules.

7 H2H2 HH 2(1) = 2e - Any 2 atoms linear

8 What about molecules consisting of more than two atoms

9 Five Molecular Shapes See the table in your notes

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11 Steps in Determining Molecular Shape 1.Draw the Lewis Structure for the Molecule. 2.Count the number of atoms attached to the central atom. 3.Count the number of lone pairs attached to the central atom. 4.Use your counts on steps 2 and 3 to determine the shape of the molecule.

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13 H2SH2S Dihydrogen monosulfide or just hydrogen sulfide is also known as sewer gas. This colorless, toxic and flammable gas is responsible for the foul odor of rotten eggs. HHS 2(1)+6 = 8e - 2/2 angular

14 H2SH2S Dihydrogen monosulfide or just hydrogen sulfide is also known as sewer gas. This colorless, toxic and flammable gas is responsible for the foul odor of rotten eggs. HH S

15 Methane (CH 4 ) 4 + 4(1) = 8e -

16 Methane (CH 4 ) 4 + 4(1) = 8e - 4 atoms attached to the central atom. 0 lone pairs on the central atom. 4/0 Tetrahedral shape

17 Methane (CH 4 ) 4 + 4(1) = 8e - 4 atoms attached to the central atom. 0 lone pairs on the central atom. 4/0 Tetrahedral shape

18 HCN HNC = 10e -

19 HCN HNC = 10e -

20 HCN HNC = 10e -

21 HCN HNC = 10e -

22 HCN HNC = 10e -

23 HCN HNC = 10e - 2/0 linear

24 H2SH2S H H S 2/2 angular

25 SO 2 OOS 6+2(6) = 18e -

26 SO 2 OOS 6+2(6) = 18e -

27 SO 2 OOS 6+2(6) = 18e - 2/1 angular

28 CH 4 4/0 tetrahedral

29 NO 3 - OON 5+3(6)+1 = 24e - O

30 NO 3 - OON 5+3(6)+1 = 24e - O

31 NO 3 - OON 5+3(6)+1 = 24e - O

32 NO 3 - OON 5+3(6)+1 = 24e - O 3/0 trigonal planer [ ] -

33 SOCl 2

34 What’s the shape of acetate? 4/0 tetrahedral 3/0 trigonal planer

35 Homework  Worksheet Chapter 13.


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