OpenSciEd Elem 5.2 (Grade 5 matter properties) - The OpenSciEd Elementary unit that breaks the 0%-Foundation pattern. Foundation 82.4% RECOMMENDED. Practices 100% green - Particles introduced per NGSS 5-PS1-1; atomic-level mechanism still deferred.
| Program | OpenSciEd Elementary |
| Unit | Grade 5, Unit 5.2: How can we make water healthy for all living things? (Matter Properties) |
| Publisher | OpenSciEd |
| Author | OpenSciEd Curriculum Development Team |
| Grade Band | Grade 5 (K-5 calibration applied) |
| NGSS Alignment | 5-PS1-1, 5-PS1-2, 5-PS1-3, 5-PS1-4, ETS1-1, ETS1-3 |
This is the first OpenSciEd Elementary unit reviewed to break the 0%-Foundation pattern. The break is structural: NGSS 5-PS1-1 mandates that students "Develop a model to describe that matter is made of particles too small to be seen" at Grade 5. OpenSciEd 5.2 complies meaningfully - Lesson 5 explicitly introduces particles as the unit's central modeling primitive, Lesson 8 uses "water particles" to explain boiling, and Lesson 9 uses "dye particles and water particles" to explain the solar still.
Of 17 mechanism passages: 8 TRUE (particles explicitly named in passage), 6 SCAFFOLDED (particles named in same lesson/unit), 3 UNSCAFFOLDED (all Lessons 1-4, pre-particle introduction). Zero map errors. Zero confirmed FSEs. Adjusted gap = 17.6%. Foundation = max(0, 100 − 17.6 − 0) = 82.4% - Recommended, mid-deep tier.
Atomic-level mechanism is still deferred per About the Science: "Students will also not be expected to be able to identify the substances down the atom" and "Modeling or understanding this at the molecular level is beyond grade band." This unit is particulate-grounded, not atomic-grounded - exactly the NGSS K-5 calibration.
Practices: 100% green - 100% practices. All seven NGSS practices score at the highest band. Mathematics & Computational Thinking is PRESENT (upgraded from PARTIAL in 4.1/4.2) because NGSS 5-PS1-2 explicitly requires "Measure and graph quantities." Engaging in Argument is Intentionally Developed (three explicit peer-feedback cycles).
The unit is organized in two lesson sets across 15 lessons.
Lessons 1-7 (Identifying Matter in Water Samples): Students compare five water samples (Lake, Pool, Metallic, Rain, Drinking) and observe properties. L3-4 are an engineering design cycle for filters. Lesson 5 is the pivot point - students develop "Modeling Unseen Matter" models, and the teacher's guide explicitly introduces "particles" as vocabulary: "matter is made of particles that are too small to be seen but can be detected by other means." L6 introduces test strips for unseen matter. L7 applies the model summatively.
Lessons 8-15 (Changing Matter Using Particle-Level Models): L8 (boiling) and L9 (solar still) use particle-level mechanism explicitly - students model what happens to water particles and dye particles during heating. L10-11 are an add-substance investigation introducing reactions (NGSS 5-PS1-4). L12 synthesizes. L13-14 are a second engineering design cycle (community water solutions). L15 is summative - students explain how to make a turtle habitat healthy.
Unit targets 5-PS1-1 (model matter as "particles too small to be seen") and 5-PS1-2 (evidence for conservation of weight across heating, cooling, or mixing). (Unit Overview, p. 15)
The NGSS PE bundle that forces the structural shift to particulate grounding at Grade 5.
First time students name matter as "made of particles" — models show unhealthy matter in water is "particles that are too small to be seen but can be detected by other means." (Lesson 5, p. 218)
The pivot point - particles enter the student vocabulary here.
Students describe how different "particles of matter" separated during boiling — some "kept them from leaving the pot" while chlorine "changed to gas." Generic particle language throughout, no molecular names. (Lesson 8, p. 300)
Particle-level mechanism applied to boiling. Particles have properties that determine what stays vs. leaves with steam.
Students discuss how the solar still separates "particles of matter that have different properties." Language stays at generic "dye particles and water particles" — no molecular names. (Lesson 9, p. 332-333)
Particle-level mechanism applied to the solar still. Dye particles and water particles explicitly named.
"Students will also not be expected to be able to identify the substances down the atom. The unit does not discuss atomic level processes, such as the movement or arrangement of the atoms (which is beyond grade band)." (About the Science, p. 43)
Explicit atomic-level deferral. Particulate grounding without atomic structure.
"Modeling or understanding this at the molecular level is beyond grade band, with students only needing to focus on the resulting change in properties rather than the molecular or atomic changes that have occurred." (About the Science, p. 44)
Explicit molecular-level deferral.
Practices: 100% green - 100% practices. Distinctive strengths: (1) two engineering design cycles (L3-4 filters; L13-14 community water); (2) three peer-feedback cycles (L4 filter designs, L5 unseen-matter models, L14 community water); (3) best modeling progression; (4) NGSS 5-PS1-2 quantitative requirement met - weight measurements before/after filtering, boiling, mixing; (5) Two Intentionally Developed Crosscutting Concepts (Cause and Effect, Energy and Matter).
The OpenSciEd Elementary pattern broke exactly where NGSS forced it to. K-4 units (1.1, 2.2, 3.1, 4.1, 4.2) all scored 0% Foundation because particles were not required and were explicitly deferred. Grade 5 unit 5.2 scores 82.4% Foundation because NGSS 5-PS1-1 requires particle introduction and OpenSciEd complies meaningfully. The framework correctly identifies the grade-band compliance shift.
The unit is already Recommended. Options to lift further:
Option A (~85-90%, Recommended/deep): Add atomic vocabulary in Lesson 5 teacher's note: "Particles are made of even smaller things called atoms. In water, the particles are called water molecules, and each water molecule is made of three atoms - two hydrogen and one oxygen."
Option B (deep tier, >85%): Reframe Lesson 11 (reactions) with atomic-level explanation: "When two substances mix and a new substance forms, the atoms haven't disappeared - they've rearranged into new groups."
Option C (alignment-only): No changes required for NGSS 5-PS1 compliance. Unit is Recommended as-is.
| Total Passages Scored | 30 |
| Raw Gap Error | 52.9% (8 of 17 mechanism passages name particles in passage) FALSE = atoms/molecules not present before students are asked to explain. The student is navigating without a starting point. |
| Adjusted Gap Error | 17.6% (3 of 17 mechanism passages UNSCAFFOLDED - all Lessons 1-4, pre-particle introduction) UNSCAFFOLDED = no atomic grounding at all. LESSON_ATOMS = atoms mentioned elsewhere in lesson but not connected to this concept. |
| Substance-Model Errors (REI) | 0 Curriculum treats a process or outcome as a substance - "heat flows," "energy is stored," "electricity flows like water." Student builds a substance ontology. |
| Label-as-Explanation (LAE) | 0 Curriculum provides a name and treats it as an explanation - "this happens because of gravity." Student believes knowing the name IS understanding the concept. |
| Vague-Entity Errors (AEC) | 0 Curriculum uses vague entities ("tiny particles," "building blocks") without specifying atoms or molecules. Student invents their own model with macroscopic properties. |
| Factual Science Errors (FSE) | 0 Statements that are scientifically incorrect - not imprecise framing, but wrong. Any confirmed FSE = Not Recommended. |
| Practices | 100% - Deep Seven practices scored PRESENT, PARTIAL, or ABSENT and averaged: asking questions, developing and using models, planning and carrying out investigations, analyzing and interpreting data, using mathematics, constructing explanations and designing solutions, and argument from evidence. Higher is better, the opposite direction from gap and map errors. Reported but not part of the Foundation Score or the verdict. |
OpenSciEd Elementary 5.2 is The unit that breaks the program-wide 0%-Foundation pattern. The break is driven by NGSS 5-PS1-1, which requires particle introduction at Grade 5. OpenSciEd complies meaningfully - particles are introduced in Lesson 5 and used explicitly in particle-level mechanism in Lessons 8 (boiling) and 9 (solar still). Atomic-level mechanism is still deferred per About the Science. The framework correctly identifies the grade-band compliance shift.
Best modeling progression in the OpenSciEd Elementary programs reviewed (initial models L1, particle-introduction models L5, solar still models L9, evolved consensus models L7 and L12). Two engineering design cycles. Three peer-feedback cycles. NGSS 5-PS1-2 quantitative requirement met. 100% green Practices score - FIRST.
mid-deep, NGSS-grade-aligned - Zero MISCONCEPTION_BY_DESIGN flags. Particles correctly framed as a modeling primitive. Reactions correctly framed (NGSS 5-PS1-4: "a new substance with different properties"). Conservation correctly framed without quantitative formalism. Atomic and molecular-level mechanism explicitly deferred to middle school - grade-band-appropriate boundaries.
Evidence for every entry is published at three levels. Each level states what it contains and what it leaves out.
Scores, verdict, and the full pattern count for this unit are above: adjusted gap, REI / LAE / AEC counts, FSE status, and the seven-practice score. The analysis quotes 6 passages verbatim from the curriculum.
This file covers the unit scored on this page.
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