This rubric can be used as a student and/or teacher checklist and/or as a teacher assessment tool for when students do the dissolved water (DO).
| Instruction/Procedure Steps | Completed correctly (2 points) | Attempted, but not successfully (1 point) | No attempt made |
|---|---|---|---|
| Sample bottles properly rinsed | |||
| Pond water collected with no air bubbles | |||
| Drops delivered vertically, not at an angle | |||
| Sample bottle is capped and mixed by inverting, not shaking | |||
| Air bubbles are removed from titration syringe | |||
| Titration with sodium thiosulfate to brownish yellow to very light yellow | |||
| After addition of starch, sodium thiosulfate titration produces a light, sky blue color | |||
| Data recorded in table | |||
| Dissolved oxygen test repeated | |||
| Analysis | Completed correctly (2 points) | Attempted, but not successfully (1 point) | No attempt made |
| Comparison made to classmates' results (Conclusion) |
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