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.
Tuesday, April 29, 2008
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.
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