Performance Task Rubric: Conservation of Mass and Chemical Reactions
Criteria | Red LIght | Yellow Light | Green Light |
Overall lab report | There were many missing elements. It was clear the test was not completed. | There were some missing elements to the report. (i.e. no conclusion or no prediction) | Each element of the lab report was completed with a great level of detail. There were no missing pieces. |
Modeling a closed System | The system was clearly not closed. | Students had elements of a closed system but failed to close it in some way. a few atoms escaped. | Students created a closed system that was clearly written in their procedure. It provided confidence in their conclusion. The visual demonstrated a closed system. |
Data and evidence | Little or no effort was put into the data. There are missing pieces of data. The conservation of mass was not proven. | Data table had a complete set of data. There was some accuracy in the data. there were reasons to believe the experiment did not prove the conservation of matter. | Data Table was well designed. It included all evidence, numbers and observations and had a strong element of accuracy. It clearly showed that the mass in the system did not change. |
Proving conservation of mass with a valid conclusion | The conclusion was present. It attempted to address the prediction. Little or no evidence was used. | The conclusion was complete. It addressed the prediction. It attempted to use evidence. | The conclusion was well written. It showed a high level of understanding and was supported with evidence. It addressed the prediction. |
Vocabulary
Word and Definition | Visual |
Conservation of Mass- The law of conservation of mass states that for any system closed to all transfers of matter and energy (both of which have mass), the mass of the system must remain constant over time, as system mass cannot change quantity if it is not added or removed. | |
Transforming Energy: A Performance Task
Jon, Will, and Kirsten
Research Question/Prediction
Research Question: How can one use an electric motor, 2 alligator clips, and a light to transform energy?
Prediction: We predict that we will be able to quickly rub the motor on a book or table to transform mechanical energy to electrical to light energy.
Procedure
1. First we hooked the motor to the light bulb socket to the leads on the motor creating a complete circuit.
2. Then we rubbed the motor quickly once up the spine of a book 30 cm. We recorded the light bulb.
3. We continued to rub the motor in the same way increasing the number of rubs by one.
Data Table
Transforming light energy
Number of times rubbed | Brightness(high, medium, low) | observation |
1 | no light | not enough energy |
2 | low | very very dim |
3 | medium | went out quickly |
4 | high | very bright a small amount of time. |
Visual
Book
Light
Motor
Conclusion with Evidence
We found our prediction was right. The light got brighter as we transformed more energy. The more times we rubbed the motor the more energy we were putting into the system. We found with 4 rubs the light was the brightest and stayed on the longest