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.
Thursday, April 17, 2008
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.
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