Grade: 5th

Duration: 60 minutes

Class Size: 15 Students

Subject: Science

Focus: Taxonomy about Mixing Substances

Standards Alignment:

• Next Generation Science Standards (NGSS) correlating with Common Core for Science Literacy:
  • 5-PS1-3: Make observations and measurements to identify materials based on their properties.
  • 5-PS1-4: Conduct investigations to determine whether mixing two or more substances results in new substances.
• Common Core State Standards (CCSS) Alignment (Science Literacy):
  • RI.5.1, RI.5.4, RI.5.7: Reading and comprehending informational texts related to scientific topics.
  • SL.5.1, SL.5.4: Engaging effectively in collaborative discussions and presenting scientific information orally.
  • W.5.2, W.5.7: Writing informative/explanatory texts and gathering information from multiple sources.

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Learning Objectives

By the end of the lesson, students will be able to:

1. Define and explain key vocabulary related to substances and their mixing properties using taxonomy categories.
2. Classify mixtures based on observable properties (homogeneous and heterogeneous).
3. Identify examples of mixtures and solutions, differentiating between physical mixtures and chemical reactions.
4. Collaborate in a hands-on investigation testing mixtures and recording their observations.
5. Communicate their understanding of substance mixing using scientific language in both oral and written form.

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Vocabulary

• Mixture
• Solution
• Solvent
• Solute
• Suspension
• Homogeneous
• Heterogeneous
• Physical Change
• Chemical Change
• Property (Physical/Chemical)
• Taxonomy

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Lesson Structure and Timeline

Time	Activity	Instructional Strategy	Resources/Materials
0-10 minutes	I Do (Teacher Modeling): Vocabulary & Taxonomy	Direct Instruction & Visuals	Word cards, anchor chart with taxonomy tree diagram, PowerPoint slides with vocabulary visuals and definitions
10-20 minutes	We Do (Guided Practice): Classifying Mixtures	Interactive Discussion & Classifying	Pre-prepared images or physical samples of mixtures (e.g., salad dressing, lemonade, muddy water)
20-30 minutes	You Do Together (Collaborative Experiment): Mixing Substances Investigation	Student Teams Conduct Investigation	Clear cups, water, sand, sugar, oil, food coloring, spoons, recording sheets
30-50 minutes	You Do Alone (Independent Practice): Vocabulary Application & Observation Recording	Written Scientific Explanation & Diagram	Student notebooks, diagram templates, vocabulary flashcards for reference
50-60 minutes	Closure: Share and Reflect with Scientific Talk	Student Presentations & Teacher-Led Q&A	Student notebooks, vocabulary wall, rubric for verbal presentation

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Detailed Lesson Plan

0–10 min: I Do – Vocabulary & Taxonomy Introduction

• Objective: Introduce key vocabulary and taxonomy hierarchy of substances by property and behavior during mixing.
• Show an anchor chart of taxonomy starting from "Substances" splitting into "Pure Substances" and "Mixtures."
• Define vocabulary terms using simple, relatable examples (e.g., sugar dissolving in water as a solution).
• Use visual aids: Demonstrate with real examples shown through slides and images as teacher models correct usage.
• Scaffold discussion by asking students guided questions: “What do you think happens when we mix oil and water?”
• CCSS Connections: RI.5.4 (Determining meanings of scientific terms), SL.5.4 (Reporting on scientific topics).

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10–20 min: We Do – Classifying Mixtures as a Class

• Present 4–5 sample mixtures (e.g., saltwater, salad dressing, muddy water, sugar and sand) either via pictures or physical examples.
• As a class, categorize mixtures under taxonomy headings: homogeneous (solutions) vs heterogeneous (suspensions).
• Record classifications visibly on the whiteboard/chart. Reinforce vocabulary usage: solvent, solute, suspension, homogeneous, heterogeneous.
• Model thinking aloud and gradual scaffolding: “Saltwater looks the same throughout, so we say it is...?”
• Students contribute explanations using targeted vocabulary in pairs before whole-class sharing.
• CCSS Connections: SL.5.1 (Collaborative discussions), RI.5.1 (Identify key details in scientific text/image), SL.5.4.

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20–30 min: You Do Together – Group Experiment on Mixing

• Activity: In groups of 3, students receive different pairs of substances (e.g., sand & water, sugar & water, oil & water, food coloring & water).
• They will mix substances and observe: Does the mixture look uniform? Can components be separated? Has a new substance formed?
• Students record findings using a simple observation chart — applying vocabulary words learned (homogeneous, heterogeneous, solution, suspension).
• Teacher circulates to prompt deeper thinking: “What properties changed or stayed the same? Is this a physical or chemical change?”
• CCSS Connections: W.5.7 (Conduct short research projects), SL.5.1.

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30–50 min: You Do Alone – Recording Observations & Scientific Explanation

• Individually, students draft a one-paragraph explanation describing their group’s best mixed substances. They need to:
  • Use 5 or more vocabulary words correctly.
  • Include classification using taxonomy (homogeneous or heterogeneous).
  • Diagram the mixed substances, labeling parts as appropriate (solute, solvent, particles).
• Teacher provides a vocabulary “cheat sheet” for reference to scaffold writing.
• Implement peer review where students exchange papers and check for vocabulary or explanation clarity.
• CCSS Connections: W.5.2 (Write informative/explanatory texts), RI.5.7 (Interpret scientific information).

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50–60 min: Closure – Scientific Talk & Reflection

• Each student shares their explanation briefly with the class or in pairs focusing on clear and accurate use of vocabulary.
• Teacher asks reflective questions: “How does understanding taxonomy help us make sense of mixtures?” “What surprised you about mixing substances?”
• Post-learning assessment: Students complete a quick exit slip — classifying a new example from a list of substances using vocabulary and taxonomy correctly.
• Teacher provides positive, targeted feedback highlighting vocab mastery and scientific thinking progress.
• CCSS Connections: SL.5.4, SL.5.1.

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Assessment

• Formative: Observation during group experiments and discussions; use of vocabulary in classifying mixtures.
• Summative: Written paragraph and diagram accurately applying vocabulary and taxonomy; exit slip classification task.
• Rubric Criteria: Vocabulary accuracy (using at least 5 words), clarity of explanation, correct taxonomy classification, neat and accurate diagram.

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Differentiation Strategies

• Provide sentence starters or graphic organizers for students who need writing support.
• Use multisensory materials (visual aids, physical samples) to support diverse learning styles.
• Offer vocabulary flashcards with pictures and definitions for ELL or struggling readers.
• Challenge advanced learners to design their own taxonomy branch or propose a new mixture example with explanation.

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This lesson plan innovatively integrates gradual release of responsibility while deeply embedding science vocabulary and taxonomical understanding in a hands-on, student-centered exploration of mixtures aligned with Common Core and NGSS standards. It empowers students not just to learn terms, but to apply, classify, and communicate scientific concepts effectively.