Friday, April 11, 2008
Fri-Day 2
Bio- we began our unit review by doing a biotechnology worksheet. Do all of today's review handouts and check out Blackboard on Sunday for the answers to these worksheets.
Chem 7/8- we learned the theory behind and the practical uses of Table F. Salts are soluble when the multiple ion-dipole attraction between the ions in the salt's lattice and the water (solvent) molecules are GREATER than the force of attraction due to the ionic bonds between the cations and anions in the lattice. This usually occurs when the ions have a low charge ( +1 or -1) and a large size (many OPEL's). However, when the ionic bonds are too strong to be overcome even by multiple ion-dipole attractions, the salt is insoluble; this occurs if the ions have high charge (+2, +3, or -2, -3) and small size (few OPEL's).
We saw that you can predict that a double replacement reaction between aqueous salts goes to completion by seeing that an insoluble precipitate forms. After some practice, you can quickly judge, with or without Table F, whether a salt is soluble or insoluble.
We then did the Precipitate Bingo prep work of hypothesizing which pairs of ionic compounds would result in the formation of insoluble precipitates. We will test these hypotheses next week.
Chem 9- we learned the theory behind and the practical uses of Table F. Salts are soluble when the multiple ion-dipole attraction between the ions in the salt's lattice and the water (solvent) molecules are GREATER than the force of attraction due to the ionic bonds between the cations and anions in the lattice. This usually occurs when the ions have a low charge ( +1 or -1) and a large size (many OPEL's). However, when the ionic bonds are too strong to be overcome even by multiple ion-dipole attractions, the salt is insoluble; this occurs if the ions have high charge (+2, +3, or -2, -3) and small size (few OPEL's).
We saw that you can predict that a double replacement reaction between aqueous salts goes to completion by seeing that an insoluble precipitate forms. After some practice, you can quickly judge, with or without Table F, whether a salt is soluble or insoluble.
Chem 7/8- we learned the theory behind and the practical uses of Table F. Salts are soluble when the multiple ion-dipole attraction between the ions in the salt's lattice and the water (solvent) molecules are GREATER than the force of attraction due to the ionic bonds between the cations and anions in the lattice. This usually occurs when the ions have a low charge ( +1 or -1) and a large size (many OPEL's). However, when the ionic bonds are too strong to be overcome even by multiple ion-dipole attractions, the salt is insoluble; this occurs if the ions have high charge (+2, +3, or -2, -3) and small size (few OPEL's).
We saw that you can predict that a double replacement reaction between aqueous salts goes to completion by seeing that an insoluble precipitate forms. After some practice, you can quickly judge, with or without Table F, whether a salt is soluble or insoluble.
We then did the Precipitate Bingo prep work of hypothesizing which pairs of ionic compounds would result in the formation of insoluble precipitates. We will test these hypotheses next week.
Chem 9- we learned the theory behind and the practical uses of Table F. Salts are soluble when the multiple ion-dipole attraction between the ions in the salt's lattice and the water (solvent) molecules are GREATER than the force of attraction due to the ionic bonds between the cations and anions in the lattice. This usually occurs when the ions have a low charge ( +1 or -1) and a large size (many OPEL's). However, when the ionic bonds are too strong to be overcome even by multiple ion-dipole attractions, the salt is insoluble; this occurs if the ions have high charge (+2, +3, or -2, -3) and small size (few OPEL's).
We saw that you can predict that a double replacement reaction between aqueous salts goes to completion by seeing that an insoluble precipitate forms. After some practice, you can quickly judge, with or without Table F, whether a salt is soluble or insoluble.
# posted by C @ 8:29 AM 
