You have been assigned to design an experiment. Be sure to include the variables to be controlled, varied, and measured. Scoring Guide Score Description 4 Response provides a sophisticated experimental design to determine a solubility curve for KNO 3 . 3 Response provides a sound experimental design to determine a solubility curve for KNO 3 . 2 Response provides a rudimentary experimental design to determine a solubility curve for KNO 3 .
Response is incorrect or irrelevant.
A friend says that one of the problems with using fossil fuels is that oxygen is used in the combustion reaction. If we keep using fossil fuels, your friend argues, all of Earth's oxygen will eventually be gone. Using scientific principles, explain why your friend's statement is incorrect. Be sure to include photosynthesis and the Law of Conservation of Matter in your explanation. Scoring Guide Score Description 4 Response demonstrates an in-depth understanding of the Law of Conservation of Matter and photosynthesis.