Ionic, Covalent, and Metallic Bonding Day 7 – Polar Covalent Molecules, finish Lab, Metallic Bonding, Properties of Substances reading

Warm Up Take out: Chemical Bonding Lab Identify: Three groups Answer: #2 and #3 Time: 6 minutes When done: Turn into class box

Agenda Review venn diagram Polar Covalent Molecules Metallic bonding video Properties of substances reading

Review Venn Diagram Find: Your venn diagram in blue bin View: Feedback Fix or Add: Additional information about ionic and covalent USE: Notes!!!! Time: 6 MINUTES WHEN DONE: Set Up cornell note on next available page (Title: Polar molecules)

Greedy Atoms https://www.youtube.com/watch?v=_M9khs87xQ8

Who is the “meanest” element on the periodic table? Why? Question Who is the “meanest” element on the periodic table? Why?

Set Up Cornell Note Open to: Next available right-hand page Title: Polar Covalent Molecules Essential questions: What happens when electrons are not shared equally? What is a polar molecule? How do polar molecules interact? THEN: Glue in electronegativity table (in blue bin) Time: 4 minutes When done: When have you heard the word, “Polar”? Have students share where zinc is on the periodic table (Element #30) Ask, “How many protons? How many electrons? How many neutrons?) Metal or non-metal or semi-conductor?

H O Polar Covalent Molecules EQ: 4/14 Electronegativity What happens when electrons are not shared equally? What is a polar molecule? How do polar molecules interact? Electronegativity The tendency to attract electron pairs to itself Greedy Atoms Sometimes, electrons in covalent bonds are not shared equally Example: bonds between hydrogen and oxygen H e- O e-

- - + + H O Polar Covalent Molecules EQ: 4/14 4/14 Greedy Atoms What happens when electrons are not shared equally? What is a polar molecule? How do polar molecules interact? Greedy Atoms Sometimes, electrons in covalent bonds are not shared equally Example: bonds between hydrogen and oxygen This creates a slight difference in CHARGE between the atoms H atom is slightly positive O is slightly negative H e- O - + e- - +

- + Polar Covalent Molecules EQ: 4/14 4/14 What happens when electrons are not shared equally? What is a polar molecule? How do polar molecules interact? This creates a slight difference in CHARGE between the atoms H atom is slightly positive O is slightly negative Molecules that have unequal sharing of electrons between atoms are called POLAR: Polar molecules have positive and negative parts - +

GLUE THIS IN! Polar Covalent Molecules EQ: 4/14 4/14 What happens when electrons are not shared equally? What is a polar molecule? How do polar molecules interact? Molecules that have unequal sharing of electrons between atoms are called POLAR: Polar molecules have positive and negative parts Polar molecules form hydrogen bonds: weak bonds between polar molecules Polarity affects a molecule’s properties: Especially water! GLUE THIS IN!

Metallic Bonding Open to: next available right-hand page Glue in: Metallic bonding video questions Time: 2 minutes When done: Read through questions https://www.youtube.com/watch?v=Bjf9gMDP47s

Metallic Bonds How are ions in an ionic crystal different from ions in a metallic crystal? What happens to valence electrons in a metal? What are the free valence electrons called? What holds atoms together in a metallic crystal? Why do metals bend, but not break, when a force is applied to them? The ions in an ionic crystal are positive and negative, the ions in a metallic crystal are all positive. The valence electrons are given up by the metal atoms, and free to move in the spaces between atoms Sea of electrons The attraction between the positive metal ions and the negative “sea of electrons” Because the sea of electrons still attracts the positive metal ions, even if they shift or move. Shape can change, but attraction is still there.

Properties of substances Read: Properties of Ionic, Covalent and Metallic Substances Use: Green card to annotate text Write: At least 3 annotations per section (for a minimum of 9 annotations) Expectations No talking Raise hand, if you have a question Time: 14 minutes When done: collect graphic organizer from front Pass out: Green cards and reading Have students turn in reading and collect green cards again

Graphic Organizer Complete ALL THREE graphic organizers, using the information provided in the reading. Identify: type of bonds that hold together atoms of substances with specific properties WHY this type of bonding results in these properties Work: with your table group. Help each other out! TIME: You have until the end of class WHEN DONE: Turn into CLASS BOX!