Thursday, January 17, 2008
Thurs-Day 2
Bio- we went over test-taking skills as applied to our last test. Try to learn from your past mistakes so that you can warn yourself before the next test about how to take a test properly to maximize your score.
We discussed some of the common diseases of the cardiovascular system.
Hypertension, which is high blood pressure, can have many independent and cumulative causes such as stress, genetics/heredity, diet, and substance abuse.
Recall the first measurement of a blood pressure reading is the systolic (SQUEEZE) pressure (typically 100 to 150 mmHg) and the second measurement is the diastolic pressure (when the heart is "relaxed" as blood goes from the atria to the ventricles (not a high-force contraction).
We discussed two similar heart attack- causing conditions:
1. coronary thrombosis, in which a thrombus- a mass of cholesterol or a blood clot particle- attaches to some plaque on the inside of a coronary artery causing a blockage of the artery.
The red blood cells are then blocked from delivering oxygen to certain heart cells and a heart attack may ensue.
2. angina pectoris is the NARROWING of coronary arteries due to deposits of cholesterol or some other plaques on the inner walls of the arteries. This causes an insufficient number of red blood cells to deliver oxygen to certain heart muscle cells.
We will discuss two other disorders after we talk about the "fluid" of the circulatory system: the blood.
Chem 7/8: we revisited the proper naming of ionic compounds (salts and bases) and covalent compounds/molecules.
We discussed the MEANING of a chemical formulas; ionic compound formulas have a DIFFERENT meaning than covalent molecule formulas because ionic formulas only tell you the RATIO of metal cations to nonmetal anions in the LATTICE (or solution) of the salt.
Molecular formulas tell you the EXACT number of atoms of each element in a SINGLE molecule of the compound or element.
We noted that ionic compounds of transition metals REQUIRE a Roman numeral whenever there is the possibility of more than one charge of metal cation for that element (that IS the case for MOST transition metals); otherwise a Roman numeral CANNOT be used.
We then discussed and completed our electrolyte/conductivity lab and most of our molecular model lab.
Chem 9: we revisited the proper naming of ionic compounds (salts and bases) and covalent compounds/molecules.
We discussed the MEANING of a chemical formulas; ionic compound formulas have a DIFFERENT meaning than covalent molecule formulas because ionic formulas only tell you the RATIO of metal cations to nonmetal anions in the LATTICE (or solution) of the salt.
Molecular formulas tell you the EXACT number of atoms of each element in a SINGLE molecule of the compound or element.
We discussed some of the common diseases of the cardiovascular system.
Hypertension, which is high blood pressure, can have many independent and cumulative causes such as stress, genetics/heredity, diet, and substance abuse.
Recall the first measurement of a blood pressure reading is the systolic (SQUEEZE) pressure (typically 100 to 150 mmHg) and the second measurement is the diastolic pressure (when the heart is "relaxed" as blood goes from the atria to the ventricles (not a high-force contraction).
We discussed two similar heart attack- causing conditions:
1. coronary thrombosis, in which a thrombus- a mass of cholesterol or a blood clot particle- attaches to some plaque on the inside of a coronary artery causing a blockage of the artery.
The red blood cells are then blocked from delivering oxygen to certain heart cells and a heart attack may ensue.
2. angina pectoris is the NARROWING of coronary arteries due to deposits of cholesterol or some other plaques on the inner walls of the arteries. This causes an insufficient number of red blood cells to deliver oxygen to certain heart muscle cells.
We will discuss two other disorders after we talk about the "fluid" of the circulatory system: the blood.
Chem 7/8: we revisited the proper naming of ionic compounds (salts and bases) and covalent compounds/molecules.
We discussed the MEANING of a chemical formulas; ionic compound formulas have a DIFFERENT meaning than covalent molecule formulas because ionic formulas only tell you the RATIO of metal cations to nonmetal anions in the LATTICE (or solution) of the salt.
Molecular formulas tell you the EXACT number of atoms of each element in a SINGLE molecule of the compound or element.
We noted that ionic compounds of transition metals REQUIRE a Roman numeral whenever there is the possibility of more than one charge of metal cation for that element (that IS the case for MOST transition metals); otherwise a Roman numeral CANNOT be used.
We then discussed and completed our electrolyte/conductivity lab and most of our molecular model lab.
Chem 9: we revisited the proper naming of ionic compounds (salts and bases) and covalent compounds/molecules.
We discussed the MEANING of a chemical formulas; ionic compound formulas have a DIFFERENT meaning than covalent molecule formulas because ionic formulas only tell you the RATIO of metal cations to nonmetal anions in the LATTICE (or solution) of the salt.
Molecular formulas tell you the EXACT number of atoms of each element in a SINGLE molecule of the compound or element.
# posted by C @ 11:30 AM 
