Density test
2 parts: measurements, questions and problems
Set-up 4 lab stations and gave students 10 minutes to make their measurements. Students worked on question and problem section of test while waiting for their turn at the lab station.
Many students had difficulties with the measurements. For reduced credit, I allowed them to go back and try again or even had another student help them.
Bring in parent letter for Sludge on Friday so we can start with the introduction to Sludge.
Wednesday, April 30, 2008
Tuesday, April 29, 2008
Tuesday, April 29, 2008 - 4A
Went over procedure for paper chromatography lab.
Students started lab.
Took out coffee filter after the inks ran and let them dry.
While waiting for the ink to dry, tried to go over Density Lab results. Students did not pay attention. I told them this material was going to be on the test next period but students did not want to go over them. Instead I let them finish the paper chromatography lab.
Finished paper chromatography lab, each student choosing an unknown. Most students were able to correctly determine which pen gave that mark.
Test and lab test next time on density.
Students started lab.
Took out coffee filter after the inks ran and let them dry.
While waiting for the ink to dry, tried to go over Density Lab results. Students did not pay attention. I told them this material was going to be on the test next period but students did not want to go over them. Instead I let them finish the paper chromatography lab.
Finished paper chromatography lab, each student choosing an unknown. Most students were able to correctly determine which pen gave that mark.
Test and lab test next time on density.
Monday, April 28, 2008
Monday, April 28, 2008 - 4B
Went over procedure for paper chromatography lab.
Students started lab.
Fire alarm.
Finished setting up lab. Took out coffee filter after the inks ran.
While waiting for the ink to dry, went over Density Labs 1,2,3.
Finished paper chromatography lab by giving each student an unknown. Most students were able to correctly determine which pen gave that mark.
Test and lab test next time on density.
Students started lab.
Fire alarm.
Finished setting up lab. Took out coffee filter after the inks ran.
While waiting for the ink to dry, went over Density Labs 1,2,3.
Finished paper chromatography lab by giving each student an unknown. Most students were able to correctly determine which pen gave that mark.
Test and lab test next time on density.
Friday, April 25, 2008
Friday, April 25, 2008 - 4A
Wrote procedure on board for finding density of liquids.
Handed out notice to parents about sludge lab. Went over it in class. The signed paper is due back to Mr. Holmes by May 5, 2008.
Students did Density 3 Lab - Density of Liquids. Write results on board. Redo if necessary. Hand in lab sheet when done.
Students did the skills sheet on density problems. Hand in when done. If students don't finish in class, finish for homework.
Test on density next period. This will have both written problems and a practical part where students have to make the correct measurements.
Handed out notice to parents about sludge lab. Went over it in class. The signed paper is due back to Mr. Holmes by May 5, 2008.
Students did Density 3 Lab - Density of Liquids. Write results on board. Redo if necessary. Hand in lab sheet when done.
Students did the skills sheet on density problems. Hand in when done. If students don't finish in class, finish for homework.
Test on density next period. This will have both written problems and a practical part where students have to make the correct measurements.
Thursday, April 24, 2008
Thursday, April 24, 2008 - 4B
Described using pictures and steps how to do the Density 3 lab - Density of liquids.
If you use a red based 10 mL graduated cylinder, the measurements are off by 0.15 mL.
Actual volume = volume read from grad cylinder - 0.15 mL.
If you use this grad cylinder for measuring the density of liquids you MUST make this correction.
Procedure:
1. Zero the electronic balance.
2. Place the 5 mL graduated cylinder on the balance and read the mass of just the graduated cylinder
3. Go to the table with the beakers of liquid and put exactly 5 ml of liquid into the graduated cylinder using a pipette. Do not bring the beakers over to the electronic balances in case of spills.
4. Re-zero the balance and put the graduated cylinder with liquid on the balance. Read the mass of the graduated cylinder + liquid.
5. Find the mass of the liquid by subtracting the mass of the graduated cylinder from the mass of the grad cylinder plus liquid.
6. Find the density using density = mass/volume
Students were given time to finish Density Lab 2, then do Density Lab 3. When done with both labs, students posted their density values on the board. They redid any I thought were too far off.
When done with all labs, students handed in both labsheets and worked on the homework packet of density problems.
If you use a red based 10 mL graduated cylinder, the measurements are off by 0.15 mL.
Actual volume = volume read from grad cylinder - 0.15 mL.
If you use this grad cylinder for measuring the density of liquids you MUST make this correction.
Procedure:
1. Zero the electronic balance.
2. Place the 5 mL graduated cylinder on the balance and read the mass of just the graduated cylinder
3. Go to the table with the beakers of liquid and put exactly 5 ml of liquid into the graduated cylinder using a pipette. Do not bring the beakers over to the electronic balances in case of spills.
4. Re-zero the balance and put the graduated cylinder with liquid on the balance. Read the mass of the graduated cylinder + liquid.
5. Find the mass of the liquid by subtracting the mass of the graduated cylinder from the mass of the grad cylinder plus liquid.
6. Find the density using density = mass/volume
Students were given time to finish Density Lab 2, then do Density Lab 3. When done with both labs, students posted their density values on the board. They redid any I thought were too far off.
When done with all labs, students handed in both labsheets and worked on the homework packet of density problems.
Tuesday, April 22, 2008
Tuesday, April 22, 2008 - 4B
Density 2 Lab - Density of Irregular Objects
Students did Density Lab 2 - Irregular objects
Lab kits had cups of gravel, nails, metal wire, balsa wood, and BB's as well as a rock and a golf ball. Also in kit were a 200 mL beaker, a pipette, and a 10 mL graduated cylinder.
I described, using pictures, the two displacement methods to find volume:
Method 1 - objects fit into graduated cylinder
Method 2 - objects do NOT fit into graduated cylinder
If objects get stuck in the graduated cylinder, use forceps to remove them or call me. Do NOT bang the graduated cylinder against the table.
If the object floats, you need to push it down just below the water level and then read the graduated cylinder.
After finding volume using method 1, pour as much water as you can back into the beaker and then dump the object onto a paper towel. Dry off. Wipe out cup if wet and then put object back into cup.
Students posted values on board - redid trials that looked a bit off, and handed lab sheets into the bin.
Students did Density Lab 2 - Irregular objects
Lab kits had cups of gravel, nails, metal wire, balsa wood, and BB's as well as a rock and a golf ball. Also in kit were a 200 mL beaker, a pipette, and a 10 mL graduated cylinder.
I described, using pictures, the two displacement methods to find volume:
Method 1 - objects fit into graduated cylinder
Method 2 - objects do NOT fit into graduated cylinder
If objects get stuck in the graduated cylinder, use forceps to remove them or call me. Do NOT bang the graduated cylinder against the table.
If the object floats, you need to push it down just below the water level and then read the graduated cylinder.
After finding volume using method 1, pour as much water as you can back into the beaker and then dump the object onto a paper towel. Dry off. Wipe out cup if wet and then put object back into cup.
Students posted values on board - redid trials that looked a bit off, and handed lab sheets into the bin.
Monday, April 21, 2008
Monday, April 21, 2008 - 4A
Students did Density Lab 2 - Irregular objects
Used two displacement methods to find volume:
Method 1 - objects fit into graduated cylinder
Method 2 - objects do NOT fit into graduated cylinder
Students posted values on board - redid trials that looked a bit off, and handed lab sheets into the bin.
Used two displacement methods to find volume:
Method 1 - objects fit into graduated cylinder
Method 2 - objects do NOT fit into graduated cylinder
Students posted values on board - redid trials that looked a bit off, and handed lab sheets into the bin.
Friday, April 18, 2008
Friday, April 18, 2008 - 4B
Collected homework on density - problems 1-9 on page 56 in textbook.
Students took out notebooks. Wrote details on doing Density Lab 1 - density of rectangular solids.
Handed out lab sheet. Students did lab.
Students posted results on board. If the results didn't look good, I had the students recheck them.
Students handed in lab sheet.
Students took out notebooks. Wrote details on doing Density Lab 1 - density of rectangular solids.
Handed out lab sheet. Students did lab.
Students posted results on board. If the results didn't look good, I had the students recheck them.
Students handed in lab sheet.
Thursday, April 17, 2008
Thursday, April 17, 2008 - 4A
Students took out notebooks. Wrote details on doing Density Lab 1 - density of rectangular solids.
Handed out lab sheet. Students did lab.
Students posted results on board. If the results didn't look good, I had the students recheck them.
After students finished and handed in lab, they worked on the homework assignment from the textbook - problems 1-9 on page 56.
Handed out lab sheet. Students did lab.
Students posted results on board. If the results didn't look good, I had the students recheck them.
After students finished and handed in lab, they worked on the homework assignment from the textbook - problems 1-9 on page 56.
Wednesday, April 16, 2008
Wednesday, April 16, 2008
Went over procedures for crystal test, acid test, flame test.
1. Look at crystals under the microscope and, in your data table, sketch the characteristic shape of the crystals.
2. Scrape the crystal in to a pile and add 1-2 drops of HCl. Check for fizz or no fizz. Enter results in data table.
3. a. Light alcohol lamp.
b. Put spoon in flame with no crystal to check for flame color and burn off any contamination.
c. Rinse spoon in water.
d. Scoop up a part of the crystal with spoon, place in flame, check color of flame. Record in data table
e. Rinse spoon between each trial.
Went over data when everyone was done. Everyone should have a complete data table in their notebook.
Asked students to write in lab book how conclusive the various tests were. This will help when writing up the "Errors and Uncertainties" section of the sludge lab.
Some students did not get the expected flame colors and asked that I do the flame test in front of them so I did.
Density = mass/volume.
Assigned density problems 1-9 on page 56 of text book for homework but did start in class. I did problem 6 and students did problems 1,2,7 on board in front of class.
1. Look at crystals under the microscope and, in your data table, sketch the characteristic shape of the crystals.
2. Scrape the crystal in to a pile and add 1-2 drops of HCl. Check for fizz or no fizz. Enter results in data table.
3. a. Light alcohol lamp.
b. Put spoon in flame with no crystal to check for flame color and burn off any contamination.
c. Rinse spoon in water.
d. Scoop up a part of the crystal with spoon, place in flame, check color of flame. Record in data table
e. Rinse spoon between each trial.
Went over data when everyone was done. Everyone should have a complete data table in their notebook.
Asked students to write in lab book how conclusive the various tests were. This will help when writing up the "Errors and Uncertainties" section of the sludge lab.
Some students did not get the expected flame colors and asked that I do the flame test in front of them so I did.
Density = mass/volume.
Assigned density problems 1-9 on page 56 of text book for homework but did start in class. I did problem 6 and students did problems 1,2,7 on board in front of class.
Tuesday, April 15, 2008
Tuesday, April 15, 2008
Went over procedures for crystal test, acid test, flame test.
1. Look at crystals under the microscope and, in your data table, sketch the characteristic shape of the crystals.
2. Scrape the crystal in to a pile and add 1-2 drops of HCl. Check for fizz or no fizz. Enter results in data table.
3. a. Light alcohol lamp.
b. Put spoon in flame with no crystal to check for flame color and burn off any contamination.
c. Rinse spoon in water.
d. Scoop up a part of the crystal with spoon, place in flame, check color of flame. Record in data table
e. Rinse spoon between each trial.
Went over data when everyone was done. Everyone should have a complete data table in their notebook.
Sink or swim exercise. Discussed density. Density of water = 1 g/cc. If an object has a density less than 1 g/cc it will float in water. If the density is greater than 1 g/cc, it will sink. If you get a density greater than 23 g/cc, you probably have made a mistake.
Density = mass/volume.
1. Look at crystals under the microscope and, in your data table, sketch the characteristic shape of the crystals.
2. Scrape the crystal in to a pile and add 1-2 drops of HCl. Check for fizz or no fizz. Enter results in data table.
3. a. Light alcohol lamp.
b. Put spoon in flame with no crystal to check for flame color and burn off any contamination.
c. Rinse spoon in water.
d. Scoop up a part of the crystal with spoon, place in flame, check color of flame. Record in data table
e. Rinse spoon between each trial.
Went over data when everyone was done. Everyone should have a complete data table in their notebook.
Sink or swim exercise. Discussed density. Density of water = 1 g/cc. If an object has a density less than 1 g/cc it will float in water. If the density is greater than 1 g/cc, it will sink. If you get a density greater than 23 g/cc, you probably have made a mistake.
Density = mass/volume.
Monday, April 14, 2008
Monday, April 14, 2008 - 4B
Quiz on fractional distillation.
Students corrected other students papers with red pen, handed them back to owners, and then handed them in bin.
Next identification labs will be Crystal Test, Acid Test, Flame Test
Went over how to set up crystal test in petri dish.
Using an overhead marker, draw lines on the bottom of the petri dish to divide the dish into quadrants. Label the quadrants 1 for CuSO4, 2 for NaCl, 3 for CaCO3/MgCO3, 4 for KCl. Students either used the solutions I mixed up (shaking first) and put 4-5 drops of each solution in the correct quadrant, or put a few drops of water in the quadrant, added some powder, and then mixed to dissolve.
Students put petri dishes in box lid to evaporate to form crystals for next class.
Students put neat data table (drawn with ruler) in notebooks for next time.
Sink or swim exercise. Density is a measure of how much mass is packed into a given volume. The density of fresh water is 1.0 g/cm^3. If an object is more dense than water, it will sink. If an object is less dense than water, it will float. Put several objects into aquarium and tested for sink or swim.
Equation for density is density = mass/volume.
Went around room giving density problems.
Played a round of science trivia.
Collected notebooks for students who did not hand them in last period.
Students corrected other students papers with red pen, handed them back to owners, and then handed them in bin.
Next identification labs will be Crystal Test, Acid Test, Flame Test
Went over how to set up crystal test in petri dish.
Using an overhead marker, draw lines on the bottom of the petri dish to divide the dish into quadrants. Label the quadrants 1 for CuSO4, 2 for NaCl, 3 for CaCO3/MgCO3, 4 for KCl. Students either used the solutions I mixed up (shaking first) and put 4-5 drops of each solution in the correct quadrant, or put a few drops of water in the quadrant, added some powder, and then mixed to dissolve.
Students put petri dishes in box lid to evaporate to form crystals for next class.
Students put neat data table (drawn with ruler) in notebooks for next time.
Sink or swim exercise. Density is a measure of how much mass is packed into a given volume. The density of fresh water is 1.0 g/cm^3. If an object is more dense than water, it will sink. If an object is less dense than water, it will float. Put several objects into aquarium and tested for sink or swim.
Equation for density is density = mass/volume.
Went around room giving density problems.
Played a round of science trivia.
Collected notebooks for students who did not hand them in last period.
Thursday, April 10, 2008
Thursday, April 10, 2008 - 4A
Quiz on fractional distillation.
Students corrected other students papers with red pen, handed them back to owners, and then handed them in bin.
Next identification labs will be Crystal Test, Acid Test, Flame Test
Went over how to set up crystal test in petri dish.
Using an overhead marker, draw lines on the bottom of the petri dish to divide the dish into quadrants. Label the quadrants 1 for CuSO4, 2 for NaCl, 3 for CaCO3/MgCO3, 4 for KCl. Students either used the solutions I mixed up (shaking first) and put 4-5 drops of each solution in the correct quadrant, or put a few drops of water in the quadrant, added some powder, and then mixed to dissolve.
Students put petri dishes in box lid to evaporate to form crystals for next class.
Students put neat data table (drawn with ruler) in notebooks for next time.
Collected notebooks.
I planned to show the Bill Nye video on Chemical Reactions but some students wanted to run some activities. I decided to let them try. It was not very successful.
Students corrected other students papers with red pen, handed them back to owners, and then handed them in bin.
Next identification labs will be Crystal Test, Acid Test, Flame Test
Went over how to set up crystal test in petri dish.
Using an overhead marker, draw lines on the bottom of the petri dish to divide the dish into quadrants. Label the quadrants 1 for CuSO4, 2 for NaCl, 3 for CaCO3/MgCO3, 4 for KCl. Students either used the solutions I mixed up (shaking first) and put 4-5 drops of each solution in the correct quadrant, or put a few drops of water in the quadrant, added some powder, and then mixed to dissolve.
Students put petri dishes in box lid to evaporate to form crystals for next class.
Students put neat data table (drawn with ruler) in notebooks for next time.
Collected notebooks.
I planned to show the Bill Nye video on Chemical Reactions but some students wanted to run some activities. I decided to let them try. It was not very successful.
Wednesday, April 9, 2008
Wednesday, April 9, 2008 - 4B
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.
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.
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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