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https://docs.google.com/presentation/d/1KWdHlj5kQRvXn1b0Fli2hn6jcFXRTHQocvfrm0B9XmM/edit#slide=id.gca40c50e5a_2_81

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Which of the following best predicts the type of bond that forms between Cs and Cl?

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Which of the following best predicts the type of bond that forms between Cs and Cl?

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a) Ionic bond

b) Polar covalent bond

c) Nonpolar covalent bond

d) Metallic bond

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As a rule of thumb, a bond is considered ionic if the difference in electronegativity between the two atoms is more than 1.6 Debye. As another rule of thumb, ionic bonds only occur between metals and nonmetals. Based on these two rules, does tetrafluorosilane (SiF4) have ionic or covalent bonds? What about trichlorofluorosilane (SiCl3F)?

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As a rule of thumb, a bond is considered ionic if the difference in electronegativity between the two atoms is more than 1.6 Debye. As another rule of thumb, ionic bonds only occur between metals and nonmetals. Based on these two rules, does tetrafluorosilane (SiF4) have ionic or covalent bonds? What about trichlorofluorosilane (SiCl3F)?

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Based on the information in the table below, arrange the following bonds in order of decreasing polarity (decreasing electronegativity difference).

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Based on the information in the table below, arrange the following bonds in order of decreasing polarity (decreasing electronegativity difference).

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a) Se-N

b) H-I

c) Cl-F

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Predict the charge on the mono-atomic ions formed from the following atoms in binary ionic compounds:

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Predict the charge on the mono-atomic ions formed from the following atoms in binary ionic compounds:

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a) P

b) Mg

c) Al

d) O

e) Cl

f) Cs

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Is the object in the image below an example of:

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Is the object in the image below an example of:

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a) Ionic bond

b) Polar covalent bond

c) Nonpolar covalent bond

d) Metallic bond

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How would you expect the bond types (ionic, polar covalent, nonpolar covalent, and metallic) to rank in terms of bond strength, and why? Is the bond type the only indicator of bond strength? Can you think of others?

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How would you expect the bond types (ionic, polar covalent, nonpolar covalent, and metallic) to rank in terms of bond strength, and why? Is the bond type the only indicator of bond strength? Can you think of others?

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(Hint: Why is diamond so hard?)

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Why is it incorrect to speak of a molecule of solid NaCl? What about a molecule of iron? (Hint: Why does salt stick together in crystals?)

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Why is it incorrect to speak of a molecule of solid NaCl? What about a molecule of iron? (Hint: Why does salt stick together in crystals?)

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Which of the following correctly shows the bond polarity? The δ +/- represents partial positive/negative charge on the atom.

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Which of the following correctly shows the bond polarity? The δ +/- represents partial positive/negative charge on the atom.

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Use this to find the elements and their electronegativities:
https://en.wikipedia.org/wiki/Electronegativity (scroll down a bit)

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Which of the following bonds is likely to have the least ionic character (smallest electronegativity difference)?

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Which of the following bonds is likely to have the least ionic character (smallest electronegativity difference)?

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a) N-O

b) C-F

c) Ca-F

d) Mg-O

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The three types of bonds we've gone through today are also called intramolecular (or interatomic) bonds. Can you think of other types of bonds or forces in chemistry? Give specific examples of chemical systems with these bonds.

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The three types of bonds we've gone through today are also called intramolecular (or interatomic) bonds. Can you think of other types of bonds or forces in chemistry? Give specific examples of chemical systems with these bonds.

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d) metallic

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d)

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a) Ionic (Cs metal + Cl nonmetal)

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Cl-F 0.8
H-I 0.5
Se-N 0.4

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a)

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You can only talk about molecules for covalent bonds, as ionic and metallic exist as aggregates?

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Se-N= - 0.4
H-I= -0.5
Cl-F= -0.8

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Strongest to weakest:
1. Nonpolar covalent (nothing to pull apart)
2. Polar covalent
3. Metallic
4. Ionic

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NaCl will never appear on its own
It only stays together in a lattice because of the positive and negative charge attraction

Metals share electrons, so they have to stay together

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Intra-atomic bonds, in DNA? between proteins via hydrogen bonds? Van der waal forces