Tuesday, January 15, 2008
Tues-Day 2
Bio- HW due Thursday- outline Section 37.2 (except for the part on ABO Blood Groups)
we began our new unit by discussing the circulatory system, which is composed of blood (the transport fluid), the heart (the pump), and the blood vessels (network through which the blood is transported).
We described the structures and functions of arteries, arterioles, capillaries, venules, and veins.
We then began to discuss the mechanism of the heart.
Chem 7/8: tomorrow is our Bonding/Intermolecular Attractions test, which is THE most important test in chemistry. It encompasses knowledge of atomic structure, periodic properties, as well as an understanding of how a substance's shape and polarity affect its properties.
Much of this topic cannot be memorized but rather must be understood through lots of practice in drawing out molecules, ions, metallic lattices, etc.
I have put additional extra help files on Blackboard.
Today, we covered two last details:
the concept of ionic and covalent "CHARACTER", which just tells how unequal or equal the electrons are shared between nuclei. To get the right answer, just look up the electronegativity difference between the two elements in the substance. The greater the difference, the more unequal the sharing of the electrons, thus, the more ionic (less covalent) the character.
We also discussed compounds that have BOTH ionic and covalent bonding occurring within any sample of the substance: to get that, just find a compound that has a POLYATOMIC ION (see Tables E or F); there are ionic bonds among the IONS BUT covalent bonds WITHIN the polyatomic ion, which is usually made up of covalently bonded nonmetal atoms.
We also saw that aqueous SALT solutions are called "ELECTROLYTES" because they conduct electricity as the CHARGED ions are "swimming" (net movement) through the solution.
Most (all, for now) molecules are nonelectrolytes due to the lack of ions and no net movement of their electrons.
We then discussed our latest lab, which we will hand in on Thursday.
Study intensely and good luck on tomorrow's test.
Chem 9: tomorrow is our Bonding/Intermolecular Attractions test, which is THE most important test in chemistry. It encompasses knowledge of atomic structure, periodic properties, as well as an understanding of how a substance's shape and polarity affect its properties.
Much of this topic cannot be memorized but rather must be understood through lots of practice in drawing out molecules, ions, metallic lattices, etc.
I have put additional extra help files on Blackboard.
Today, we covered two last details:
the concept of ionic and covalent "CHARACTER", which just tells how unequal or equal the electrons are shared between nuclei. To get the right answer, just look up the electronegativity difference between the two elements in the substance. The greater the difference, the more unequal the sharing of the electrons, thus, the more ionic (less covalent) the character.
We also discussed compounds that have BOTH ionic and covalent bonding occurring within any sample of the substance: to get that, just find a compound that has a POLYATOMIC ION (see Tables E or F); there are ionic bonds among the IONS BUT covalent bonds WITHIN the polyatomic ion, which is usually made up of covalently bonded nonmetal atoms.
We also saw that aqueous SALT solutions are called "ELECTROLYTES" because they conduct electricity as the CHARGED ions are "swimming" (net movement) through the solution.
Most (all, for now) molecules are nonelectrolytes due to the lack of ions and no net movement of their electrons.
Study intensely and good luck on tomorrow's test.
we began our new unit by discussing the circulatory system, which is composed of blood (the transport fluid), the heart (the pump), and the blood vessels (network through which the blood is transported).
We described the structures and functions of arteries, arterioles, capillaries, venules, and veins.
We then began to discuss the mechanism of the heart.
Chem 7/8: tomorrow is our Bonding/Intermolecular Attractions test, which is THE most important test in chemistry. It encompasses knowledge of atomic structure, periodic properties, as well as an understanding of how a substance's shape and polarity affect its properties.
Much of this topic cannot be memorized but rather must be understood through lots of practice in drawing out molecules, ions, metallic lattices, etc.
I have put additional extra help files on Blackboard.
Today, we covered two last details:
the concept of ionic and covalent "CHARACTER", which just tells how unequal or equal the electrons are shared between nuclei. To get the right answer, just look up the electronegativity difference between the two elements in the substance. The greater the difference, the more unequal the sharing of the electrons, thus, the more ionic (less covalent) the character.
We also discussed compounds that have BOTH ionic and covalent bonding occurring within any sample of the substance: to get that, just find a compound that has a POLYATOMIC ION (see Tables E or F); there are ionic bonds among the IONS BUT covalent bonds WITHIN the polyatomic ion, which is usually made up of covalently bonded nonmetal atoms.
We also saw that aqueous SALT solutions are called "ELECTROLYTES" because they conduct electricity as the CHARGED ions are "swimming" (net movement) through the solution.
Most (all, for now) molecules are nonelectrolytes due to the lack of ions and no net movement of their electrons.
We then discussed our latest lab, which we will hand in on Thursday.
Study intensely and good luck on tomorrow's test.
Chem 9: tomorrow is our Bonding/Intermolecular Attractions test, which is THE most important test in chemistry. It encompasses knowledge of atomic structure, periodic properties, as well as an understanding of how a substance's shape and polarity affect its properties.
Much of this topic cannot be memorized but rather must be understood through lots of practice in drawing out molecules, ions, metallic lattices, etc.
I have put additional extra help files on Blackboard.
Today, we covered two last details:
the concept of ionic and covalent "CHARACTER", which just tells how unequal or equal the electrons are shared between nuclei. To get the right answer, just look up the electronegativity difference between the two elements in the substance. The greater the difference, the more unequal the sharing of the electrons, thus, the more ionic (less covalent) the character.
We also discussed compounds that have BOTH ionic and covalent bonding occurring within any sample of the substance: to get that, just find a compound that has a POLYATOMIC ION (see Tables E or F); there are ionic bonds among the IONS BUT covalent bonds WITHIN the polyatomic ion, which is usually made up of covalently bonded nonmetal atoms.
We also saw that aqueous SALT solutions are called "ELECTROLYTES" because they conduct electricity as the CHARGED ions are "swimming" (net movement) through the solution.
Most (all, for now) molecules are nonelectrolytes due to the lack of ions and no net movement of their electrons.
Study intensely and good luck on tomorrow's test.
# posted by C @ 2:06 PM 
