Went over graphs from Fractional Distillation Day 1 highlighting plateaus showing boiling points of alcohol and of water.
For the boiling point plateau for alcohol, students got between 79-83 deg C and for water, between 98-104 deg C. We chose swap out temperatures to be 84 deg C, 96 deg C.
In the first test tube, we should have pure alcohol. In the second, late alcohol and early water, and in the third, pure water.
Student did the Fractional Distillation Lab - Day 2 in which they performed the separation based on the different boiling points and swapping test tubes. I gave each student 25 ml of green liquid in their large test tube after they had put in 3-5 boiling chips.
While waiting for the swap out temperatures, students looked at their crystals from last time and sketched a diagnostic crystal for the salt.
Students shut down the alcohol lamp when they had 1 - 1.5 cm left in the "burning" (original large) test tube.
While waiting for equipment to cool, they performed a flammability test on the liquids in each test tube. The alcohol lamp is to the left and a coffee can 1/3 filled with water to the right. You dip the flammability strip into the liquid, hold it level in the flame, check for flammability, and then move your hand to the right to drop the strip into the can of water.
The lab went well, almost all lab groups managed to get to test tube 3.
Students made sure they had picture of lab set up, material list, procedure, and sketch of the graph in their notebooks.
Collected lab notebooks.
Wednesday, April 9, 2008
Tuesday, April 8, 2008 - 4A
Stamped graphs for Fractional Distillation Day 1 which students were supposed to complete for homework if they didn't finish it in class last Friday.
Went over graph highlighting plateaus showing boiling points of alcohol and of water.
For the boiling point plateau for alcohol, students got between 80-82 deg C and for water, between 100-102 deg C. We chose swap out temperatures to be 84 deg C, 98 deg C. Later, since thermometers seemed to be running a bit low, I let students swap out at 96 deg C.
In the first test tube, we should have pure alcohol. In the second, late alcohol and early water, and in the third, pure water.
Student did the Fractional Distillation Lab - Day 2 in which they performed the separation based on the different boiling points and swapping test tubes. I gave each student 25 ml of green liquid in their large test tube after they had put in 3-5 boiling chips.
While waiting for the swap out temperatures, students looked at their crystals from last time and sketched a diagnostic crystal for the salt.
Students shut down the alcohol lamp when they had 1 - 1.5 cm left in the "burning" (original large) test tube.
While waiting for equipment to cool, they performed a flammability test on the liquids in each test tube. The alcohol lamp is to the left and a coffee can 1/3 filled with water to the right. You dip the flammability strip into the liquid, hold it level in the flame, check for flammability, and then move your hand to the right to drop the strip into the can of water.
The lab went reasonably well though some people did not quite finish the separation to the third test tube.
Went over graph highlighting plateaus showing boiling points of alcohol and of water.
For the boiling point plateau for alcohol, students got between 80-82 deg C and for water, between 100-102 deg C. We chose swap out temperatures to be 84 deg C, 98 deg C. Later, since thermometers seemed to be running a bit low, I let students swap out at 96 deg C.
In the first test tube, we should have pure alcohol. In the second, late alcohol and early water, and in the third, pure water.
Student did the Fractional Distillation Lab - Day 2 in which they performed the separation based on the different boiling points and swapping test tubes. I gave each student 25 ml of green liquid in their large test tube after they had put in 3-5 boiling chips.
While waiting for the swap out temperatures, students looked at their crystals from last time and sketched a diagnostic crystal for the salt.
Students shut down the alcohol lamp when they had 1 - 1.5 cm left in the "burning" (original large) test tube.
While waiting for equipment to cool, they performed a flammability test on the liquids in each test tube. The alcohol lamp is to the left and a coffee can 1/3 filled with water to the right. You dip the flammability strip into the liquid, hold it level in the flame, check for flammability, and then move your hand to the right to drop the strip into the can of water.
The lab went reasonably well though some people did not quite finish the separation to the third test tube.
Monday, April 7, 2008
Monday, April 7, 2008 - 4B
Handed back and went over any questions on Chapter 2 test. Recollected tests.
Students did Fractional Distillation Lab Day 1.
1. Put 3-5 boiling chips in the large test tube
2. I will then give you ~ 25 mL of mixture in the large test tube
3. Take data every 30 seconds
4. Stop when you have 1 - 1.5 cm of liquid in the original test tube.
5. Clean a petri dish and put a small amount of the remaining green mixture in the petri dish. Put it in the box and let it evaporate and crystallize.
6. Pour the rest of the green liquid (including boiling chips), and all the liquid you distilled into the designated beaker. Nothing goes down the sink.
7. Plot graph. Everyone plots the data on graph paper
8a. On graph, clearly indicate the plateaus and boiling points and show the BP temperatures
8b. For each section of the graph, clearly show where you have alcohol, water, or a mixture.
8c. Show swap temperatures on the graph.
For Homework, plot graph, make sure you have a sketch of the lab setup, material list, and procedure notes in you notebook. Include the special safety precautions such as: be sure to carefully regulate the boiling so you don't over boil and be sure to raise the rubber tubing out of the collected liquid before you shut off your alcohol burner.
Don't put so much ice water in the Erlenmeyer flask that it goes into the collection test tube.
Next class we will do the actual separation in Day 2 - Fractional Distillation.
Students did Fractional Distillation Lab Day 1.
1. Put 3-5 boiling chips in the large test tube
2. I will then give you ~ 25 mL of mixture in the large test tube
3. Take data every 30 seconds
4. Stop when you have 1 - 1.5 cm of liquid in the original test tube.
5. Clean a petri dish and put a small amount of the remaining green mixture in the petri dish. Put it in the box and let it evaporate and crystallize.
6. Pour the rest of the green liquid (including boiling chips), and all the liquid you distilled into the designated beaker. Nothing goes down the sink.
7. Plot graph. Everyone plots the data on graph paper
8a. On graph, clearly indicate the plateaus and boiling points and show the BP temperatures
8b. For each section of the graph, clearly show where you have alcohol, water, or a mixture.
8c. Show swap temperatures on the graph.
For Homework, plot graph, make sure you have a sketch of the lab setup, material list, and procedure notes in you notebook. Include the special safety precautions such as: be sure to carefully regulate the boiling so you don't over boil and be sure to raise the rubber tubing out of the collected liquid before you shut off your alcohol burner.
Don't put so much ice water in the Erlenmeyer flask that it goes into the collection test tube.
Next class we will do the actual separation in Day 2 - Fractional Distillation.
Friday, April 4, 2008
Friday, April 4, 2008 - 4A
Handed back and went over any questions on Chapter 2 test. Recollected tests.
Students did Fractional Distillation Lab Day 1.
1. Take data every 30 seconds
2. Everyone plots the data on graph paper
3a. On graph, clearly indicate the boiling points and show the BP temperature
b. For each section of the graph, clearly show where you have alcohol, water, or a mixture.
c. Show swap temperatures on the graph.
4. In notebooks, write down the material list for the fractional distillation labs.
Each student came up with their large test tube, put in 3-5 boiling chips, and I gave them approx 25 mL of solution.
Stop boiling when you have 1 - 1.5 cm left in boiling test tube.
Pour all liquids in designated beaker, nothing goes down sink.
Students did a great job of setting up and getting going. I was very proud of all of them.
Students did Fractional Distillation Lab Day 1.
1. Take data every 30 seconds
2. Everyone plots the data on graph paper
3a. On graph, clearly indicate the boiling points and show the BP temperature
b. For each section of the graph, clearly show where you have alcohol, water, or a mixture.
c. Show swap temperatures on the graph.
4. In notebooks, write down the material list for the fractional distillation labs.
Each student came up with their large test tube, put in 3-5 boiling chips, and I gave them approx 25 mL of solution.
Stop boiling when you have 1 - 1.5 cm left in boiling test tube.
Pour all liquids in designated beaker, nothing goes down sink.
Students did a great job of setting up and getting going. I was very proud of all of them.
Thursday, April 3, 2008
Thursday, April 3, 2008 - 4B
Students took chapter 2 test.
Introduced Fractional Distillation Lab.
Day 1: take temperature vs time data, plot data to get heating curve, find boiling points.
If you get green liquid in second test tube, it shows you over boiled.
Day 2: Swap out test tubes 2 degrees after first boiling point and 2 degrees before second boiling point. It takes 3 test tubes to make sure you get pure substances.
If you were to have 3 liquids, it would take 5 test tubes.
Drew diagram of lab setup.
Explained flammability test after Day 2.
We will do crystal test after Day 1 with what is left in the boiling test tube.
Introduced Fractional Distillation Lab.
Day 1: take temperature vs time data, plot data to get heating curve, find boiling points.
If you get green liquid in second test tube, it shows you over boiled.
Day 2: Swap out test tubes 2 degrees after first boiling point and 2 degrees before second boiling point. It takes 3 test tubes to make sure you get pure substances.
If you were to have 3 liquids, it would take 5 test tubes.
Drew diagram of lab setup.
Explained flammability test after Day 2.
We will do crystal test after Day 1 with what is left in the boiling test tube.
Wednesday, April 2, 2008
Wednesday, April 2, 2008 - 4A
Handed back counting atoms quiz. Individually explained procedure to people who had difficulty.
Students took chapter 2 test.
Introduced Fractional Distillation Lab.
Day 1: take temperature vs time data, plot data to get heating curve, find boiling points.
If you get green liquid in second test tube, it shows you over boiled.
Day 2: Swap out test tubes 2 degrees after first boiling point and 2 degrees before second boiling point. It takes 3 test tubes to make sure you get pure substances.
If you were to have 3 liquids, it would take 5 test tubes.
Drew diagram of lab setup.
Explained flammability test after Day 2.
We will do crystal test after Day 1 with what is left in the boiling test tube.
Students took chapter 2 test.
Introduced Fractional Distillation Lab.
Day 1: take temperature vs time data, plot data to get heating curve, find boiling points.
If you get green liquid in second test tube, it shows you over boiled.
Day 2: Swap out test tubes 2 degrees after first boiling point and 2 degrees before second boiling point. It takes 3 test tubes to make sure you get pure substances.
If you were to have 3 liquids, it would take 5 test tubes.
Drew diagram of lab setup.
Explained flammability test after Day 2.
We will do crystal test after Day 1 with what is left in the boiling test tube.
Tuesday, April 1, 2008
Tuesday, April 1, 2008 - 4B
Jeopardy Review
Students wrote in notebooks things they learned from the Jeopardy questions.
Quiz on counting atoms.
Checked notebooks for 5 things students learned. Stamped notebook.
Test on Thursday.
Students wrote in notebooks things they learned from the Jeopardy questions.
Quiz on counting atoms.
Checked notebooks for 5 things students learned. Stamped notebook.
Test on Thursday.
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