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| This is HL 4. Place your name and period on top of the sheet and hand it in the next class meeting. Be sure you follow the example in the first problem when completing the handout. |
Students will be able to:
-determine why scientists use a standard measurement system.
-describe density and calculate and compare the densities of various materials using the materials' masses and volumes.
Students completed the following bell ringer:
Jenna's dog
eats a mixture of dry and canned dog food. When she feeds him, she pours some
dry dog food into a bowl and gets a can of dog food out of the pantry. She
plugs an electric can opener into an outlet to open the can. To open the can,
the can opener converts electric energy into what type of energy?
Students received HL 4, which can be found at the top of this blog. You received two sheets: complete one for the notebook and hand one in. Be sure to put your name and period on the sheet you hand in.
Classes that did not do the probe on Ice Cubes In A Bag completed the probe.
Classes that needed to complete reading of the tex did so, from section 1.2 on measurement.
Students then began the write up for the Density of Rocks lab. Below, please find a sample of how you should complete every lab, using the information for the Density of Rocks lab:
SC.8.P.8.3-Measure mass and volume of different types of rocks and calculate the density of the rocks.
Problem-Do all rocks have the same density?
Hypothesis-If different rock types are made of different minerals or have different mineral content, then the rocks will have different densities, because the minerals have different densities.
Variables
Independent (test) variable-different rocks with different minerals
Dependent (outcome) variable-mass, volume and density of rocks.
Control test-none
Constants-amount of water in the graduated cylinder.
Number of Trials-1
Number of Trials-1
Materials: different types of rocks, beaker, pipet, water, triple beam balance, 100 mL graduated cylinder.
Procedures:
1. Before beginning, make sure the triple beam balanced is working correctly and is tuned.
2. Place a rock sample on the pan and find and record the grams.
3. Place 50 mL of water in the graduated cylinder and record the volume in the initial volume column on the table.
4. Add the rock to the test tube. Read and record the new water level in the column marked.
5. Subtract the initial volume from the final volume and record the volume of the rock in the appropriate place.
5. Divide mass and volume to determine density.
6. Repeat steps 1through 6 to determine the density of the other rocks.
Data and Observations
Mass, Volume, and Density
Place a table with the columns: Rock Sample: Mass, g; Initial Volume, mL; Final volume, mL; Volume of rock, mL; Density of Rock, g/ML in your book and complete as you examine each rock sample.
We will work on Analysis of Data and Conclusions next week.