Unit 3 Review.

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Presentation transcript:

Unit 3 Review

Objective #31 Describe covalent and ionic bonds

Objective #31 What happens to the valence electrons of sodium and chlorine when they bond? What happens to the valence electrons of carbon and hydrogen when they bond?

Objective #32 Predict what type of bond would form between 2 atoms using the Periodic Table.

Objective #32 What kind of bond is formed between magnesium and oxygen? What kind of bond is formed between nitrogen and another nitrogen?

Objective #33 Predict what the formula of an ionic compound would be given the combining cation and anion.

Objective #33 What is the formula of the compound when the following ions combine? Fe3+ and SCN- Ca2+ and OH- NH4+ and PO43-

Objective #34 Predict what type of bond would form between 2 atoms using the differences in electronegativity.

Objective #34 Give an example of 2 atoms with each of the following bonds using the charts provided: 2 atoms with a nonpolar covalent bond 2 atoms with a polar covalent bond 2 atoms with an ionic bond

Objective #35 Understand electrostatic attraction

Objective #35 Describe how sodium and chlorine are attracted to one another when they bond.

Objective #36 Relate the number of “dots” in a Lewis dot structure to the number of valence electrons.

Objective #36 Prove that argon has 8 valence electrons.

Objective #37 Follow the rules of drawing Lewis or electron dot diagrams.

Objective #37 Draw any Lewis structure using 4 total atoms that shows 3 (and only 3) covalent bonds.

Objective #38 State the octet rule.

Objective #38 Why does hydrogen not follow the octet rule? Name 4 atoms that “want to be like argon” and describe how they achieve this.

Objective #39 Describe the polarity of water.

Objective #39 Why is the word ‘polar’ used to describe molecules like water?

Objective #40 Describe hydrogen bonding.

Objective #40 You have to put on a pair of socks. You probably know that it’s easier to do if your feet are totally dry. Why is this true? I bet hydrogen bonding has something to do with it.

Objective #41 Compare and contrast polar and nonpolar covalent bonds.

Objective #41 Water is a polar compound. Oil is a nonpolar compound. How come water can’t dissolve oil? Being polar and nonpolar are used in the explanation!