Excellent (4): Shows complete understanding of how baking soda and vinegar react

Good (3): Shows good understanding with minor gaps

Satisfactory (2): Shows basic understanding of the reaction

Needs Improvement (1): Shows little understanding of what happened

Excellent (4): Correctly identifies baking soda as base and vinegar as acid

Good (3): Identifies one correctly, attempts the other

Satisfactory (2): Shows basic knowledge that they are different

Needs Improvement (1): Cannot identify bases and acids

Excellent (4): Records detailed observations (bubbling, fizzing, temperature)

Good (3): Records good observations with some detail

Satisfactory (2): Records basic observations (it bubbled)

Needs Improvement (1): Records few or unclear observations

Excellent (4): Actively participates, follows safety rules, helps others

Good (3): Participates well, follows most safety rules

Satisfactory (2): Participates when asked, follows basic safety

Needs Improvement (1): Limited participation, needs safety reminders

Excellent (4): Clear, confident presentation with good explanations

Good (3): Good presentation with mostly clear explanations

Satisfactory (2): Basic presentation, some unclear parts

Needs Improvement (1): Unclear presentation, needs prompting