Sunday, January 13, 2008
Fri-Day 2
Bio- we reviewed for Monday's exam. We got through the questions on the digestive system; the remaining questions and extensive answers, which are in your notes, are reproduced in a file on Blackboard. Write out those questions, answers, and drawings until you can do them by heart and you will be in great shape for Monday's exam.
Chem 7/8- we explained and illustrated the three types of INTERmolecular attractions and showed how to determine the intermolecular attractions that apply to a given molecule. The TWO factors that determine the type of intermolecular attractions between molecules of a given substance are:
1. the polarity of the bonds in the molecule and whether there are any lone pairs of electrons
2. the shape of the molecule, which determines how those bonds and/or lone pairs of electrons are arranged
The bottom line single criterion in determining molecular polarity is:
1. symmetric/even distribution or arrangement of electrons CAUSES a nonpolar molecule
2. asymmetric/uneven distribution or arrangement of electrons causes a polar molecule.
We then discussed ion-dipole (also called molecule-ion) attractions, which explain how aqueous solutions of salts form (see animation on Blackboard or drawing in notes).
We then began two discuss the four types of solid phase substances, which we will continue with on Monday:
1. ionic
2. covalent-network
3. molecular
4. metallic
We noted how the type of substance determines its properties i.e. electrical conductivity is only due to the NET movement of ions or electrons.
We then performed a lab procedure in which we tested the electrical conductivity of various substances in the solid phase, the liquid phase, or the aqueous phase. We will discuss this lab on Tuesday.
Chem 9- we explained and illustrated the three types of INTERmolecular attractions and showed how to determine the intermolecular attractions that apply to a given molecule. The TWO factors that determine the type of intermolecular attractions between molecules of a given substance are:
1. the polarity of the bonds in the molecule and whether there are any lone pairs of electrons
2. the shape of the molecule, which determines how those bonds and/or lone pairs of electrons are arranged
The bottom line single criterion in determining molecular polarity is:
1. symmetric/even distribution or arrangement of electrons CAUSES a nonpolar molecule
2. asymmetric/uneven distribution or arrangement of electrons causes a polar molecule.
We then discussed ion-dipole (also called molecule-ion) attractions, which explain how aqueous solutions of salts form (see animation on Blackboard or drawing in notes).
We then began two discuss the four types of solid phase substances, which we will continue with on Monday:
1. ionic
2. covalent-network
3. molecular
4. metallic
We noted how the type of substance determines its properties i.e. electrical conductivity is only due to the NET movement of ions or electrons.
Chem 7/8- we explained and illustrated the three types of INTERmolecular attractions and showed how to determine the intermolecular attractions that apply to a given molecule. The TWO factors that determine the type of intermolecular attractions between molecules of a given substance are:
1. the polarity of the bonds in the molecule and whether there are any lone pairs of electrons
2. the shape of the molecule, which determines how those bonds and/or lone pairs of electrons are arranged
The bottom line single criterion in determining molecular polarity is:
1. symmetric/even distribution or arrangement of electrons CAUSES a nonpolar molecule
2. asymmetric/uneven distribution or arrangement of electrons causes a polar molecule.
We then discussed ion-dipole (also called molecule-ion) attractions, which explain how aqueous solutions of salts form (see animation on Blackboard or drawing in notes).
We then began two discuss the four types of solid phase substances, which we will continue with on Monday:
1. ionic
2. covalent-network
3. molecular
4. metallic
We noted how the type of substance determines its properties i.e. electrical conductivity is only due to the NET movement of ions or electrons.
We then performed a lab procedure in which we tested the electrical conductivity of various substances in the solid phase, the liquid phase, or the aqueous phase. We will discuss this lab on Tuesday.
Chem 9- we explained and illustrated the three types of INTERmolecular attractions and showed how to determine the intermolecular attractions that apply to a given molecule. The TWO factors that determine the type of intermolecular attractions between molecules of a given substance are:
1. the polarity of the bonds in the molecule and whether there are any lone pairs of electrons
2. the shape of the molecule, which determines how those bonds and/or lone pairs of electrons are arranged
The bottom line single criterion in determining molecular polarity is:
1. symmetric/even distribution or arrangement of electrons CAUSES a nonpolar molecule
2. asymmetric/uneven distribution or arrangement of electrons causes a polar molecule.
We then discussed ion-dipole (also called molecule-ion) attractions, which explain how aqueous solutions of salts form (see animation on Blackboard or drawing in notes).
We then began two discuss the four types of solid phase substances, which we will continue with on Monday:
1. ionic
2. covalent-network
3. molecular
4. metallic
We noted how the type of substance determines its properties i.e. electrical conductivity is only due to the NET movement of ions or electrons.
# posted by C @ 3:03 PM 
