iRubric: Identify an Unknown Powder rubric

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Identify an Unknown Powder

Write a 2–3 page argumentative essay where you use the provided powder data to make a claim about its identity, support it with calculations and evidence, explain your reasoning, and respond to at least two counterclaims.

Rubric Code: S252WWC

By smoonitz

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Public Rubric

Subject: Chemistry

Type: Writing

Grade Levels: 9-12, Undergraduate

Argumentative Essay Scoring Rubric
	Needs Work 1 pts	Approaching 2 pts	Meets Expectations 3 pts	Exceeds Expectations 4 pts
Claim	Needs Work Claim is missing, unclear, or does not address the task	Approaching Claim is present but vague or only partially addresses the task; counterclaims may be weak	Meets Expectations Clear claim that fully answers the task; addresses counterclaims	Exceeds Expectations Clear, strong claim that shows deep understanding; addresses counterclaims thoughtfully
Evidence	Needs Work Little or no evidence; calculations are missing or incorrect	Approaching Some evidence is provided but may be incomplete, unclear, or weakly connected	Meets Expectations Accurate and sufficient evidence; calculations and data support the claim	Exceeds Expectations Multiple pieces of accurate, precise evidence; calculations and data are clearly explained and strongly support the claim
Organization	Needs Work Essay lacks clear organization; ideas are confusing or jumbled	Approaching Some structure is present, but parts are out of order or hard to follow	Meets Expectations Essay has clear structure with beginning, middle, and end; transitions mostly work	Exceeds Expectations Essay is well-structured with clear sections (Intro, Evidence, Reasoning, Counterclaim, Conclusion); strong transitions and flow
Conventions	Needs Work Many errors that make it hard to understand; little attention to grammar or format	Approaching Frequent errors that sometimes interfere with understanding; style may be too casual	Meets Expectations Minor errors that don’t interfere with understanding; mostly formal style	Exceeds Expectations Grammar, spelling, and formatting are correct; style is formal and clear