Wednesday, May 21, 2008
Mon-Day 1
Bio- we discussed the meaning of a biological "niche", which is the "role" that an organism plays in an ecosystem; this role includes, for a given species, its habitat, food sources, predator-prey relationships, and general relationships to any biotic and abiotic factors in the habitat.
We saw that species that have the same or similar niches will have increased competition for survival because they consume similar food and live in the same areas.
Chem 7- we discussed the various rules for assigning oxidation numbers; oxidation numbers are assigned so that one can determine which elements lose or gain electrons (or electron density i.e. the electrons get closer to their nuclei) in a chemical reaction.
The oxidation numbers are logical because, for ions, the oxidation number matches the charge of the ion; for atoms, the oxidation numbers are negative for the more electronegative atoms in the compound and positive for the less electronegative elements in the compound.
See Blackboard for answers to all of the worksheet questions.
Chem 8/9- we discussed the various rules for assigning oxidation numbers; oxidation numbers are assigned so that one can determine which elements lose or gain electrons (or electron density i.e. the electrons get closer to their nuclei) in a chemical reaction.
The oxidation numbers are logical because, for ions, the oxidation number matches the charge of the ion; for atoms, the oxidation numbers are negative for the more electronegative atoms in the compound and positive for the less electronegative elements in the compound.
See Blackboard for answers to all of the worksheet questions.
We then discussed the salt hydrolysis lab.
We saw that species that have the same or similar niches will have increased competition for survival because they consume similar food and live in the same areas.
Chem 7- we discussed the various rules for assigning oxidation numbers; oxidation numbers are assigned so that one can determine which elements lose or gain electrons (or electron density i.e. the electrons get closer to their nuclei) in a chemical reaction.
The oxidation numbers are logical because, for ions, the oxidation number matches the charge of the ion; for atoms, the oxidation numbers are negative for the more electronegative atoms in the compound and positive for the less electronegative elements in the compound.
See Blackboard for answers to all of the worksheet questions.
Chem 8/9- we discussed the various rules for assigning oxidation numbers; oxidation numbers are assigned so that one can determine which elements lose or gain electrons (or electron density i.e. the electrons get closer to their nuclei) in a chemical reaction.
The oxidation numbers are logical because, for ions, the oxidation number matches the charge of the ion; for atoms, the oxidation numbers are negative for the more electronegative atoms in the compound and positive for the less electronegative elements in the compound.
See Blackboard for answers to all of the worksheet questions.
We then discussed the salt hydrolysis lab.
# posted by C @ 12:16 PM 
