NGSS 2-PS1-1
Plan and conduct an investigation to describe and classify different kinds of materials by their observable properties.
At a Glance
THIS STANDARD FOCUSES ON
Investigating materials systematically by their observable properties — density, absorption, surface tension, elasticity, texture, color, hardness — and classifying them based on what those properties tell us about their behavior.
KEY SKILLS ADDRESSED
Observation, classification, systematic investigation planning, comparison, evidence-based reasoning, vocabulary application
CORE CONCEPTS
Density, surface tension, absorption, capillary action, polymer properties, observable vs non-observable characteristics, classification systems
HOW BRAINIAC BUNCHSUPPORTS THIS
Five Season 1 episodes build this standard — raisins in soda water (density/buoyancy), milk color burst (surface tension), lava lamp (density layers), walking water (absorption/capillary action), and slime (polymer material properties). The most comprehensively covered standard in Season 1.
Official Standard Language
Next Generation Science Standards (NGSS), 2013
Standard Code:
NGSS 2-PS1-1
Grade Level:
Grade 2
Performance Expectation:
Plan and conduct an investigation to describe and classify different kinds of materials by their observable properties.
Disciplinary Core Idea:
PS1.A: Structure and Properties of Matter — Different kinds of matter exist and many of them can be either solid or liquid, depending on temperature. Matter can be described and classified by its observable and measurable properties.
How Our Content Aligns
Mapping Brainiac Bunch resources to this standard
Little Lab Challenges supports NGSS 2-PS1-1 more comprehensively than any other Season 1 standard — five episodes across different material property domains give students repeated, diverse experience classifying materials by what they can observe. Running a class Season 1 Materials Properties Chart that adds one row per episode creates authentic long-term data collection evidence.
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Episodes:
Five episodes each exploring different observable material properties: density/buoyancy (Ep2), surface tension/surfactants (Ep4), density/layering (Ep5), absorption/capillary action (Ep8), polymer elasticity (Ep9)
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Activities:
Five hands-on material classification activities — each tests a different property across multiple substances for direct comparison data
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Printables:
Cause & Effect Sheet (Ep2), Draw Your Color Swirl (Ep4), Lava Lamp Observation Log (Ep5), Color Mixing Map (Ep8), Slime Recipe Card + Texture Rating Sheet (Ep9)
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Topics:
Matter & Its Properties subtopic within Physical Science — covers density, surface tension, absorption, polymer properties, and observable classification
Aligned Episodes
5 Episodes
supporting this standard
Super Simple Slime
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Walking Water Colors
Little Lab Challenges • 8 minutes • Ages 5–10
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Magic Milk Color Burst
Little Lab Challenges • 8 minutes • Ages 5–10
Using This Standard Across Ages
For Younger Learners (Ages 5-6)
Focus on one property at a time per experiment. For raisins: just 'Does it sink or float?' For milk: just 'Which milk made bigger colors?' Use color coding and drawing rather than words. The 'Draw it' column in the Cause & Effect Sheet is the priority. Verbal responses to 'Why?' questions are fine — scribe for non-writers.
For Grade-Level Learners (Ages 7-8)
Use all four columns in the Cause & Effect Sheet. Challenge students to explain WHY each object did or did not dance using the vocabulary word 'density.' Build a running class materials properties chart — one row per episode — tracking density, absorption, and surface tension across all 5 Season 1 experiments. This is the most NGSS-accurate data collection approach for this standard.
For Advanced Learners (Ages 9-10)
Add quantitative data: measure the exact density of oil and water using a kitchen scale and known volumes. Calculate the density ratio. Compare the dance duration of raisins across different carbonation levels (fresh soda water vs flat). Design a fair-test investigation: control all variables except one material property. Write a conclusion that uses the evidence from 3+ experiments to make a claim about classification.
Evidence of Learning
Observable outcomes and assessment support
Students demonstrate mastery when they can:
✓ Name 3+ observable properties of a material using correct vocabulary.
✓ Plan a simple test of one property across 3+ materials.
✓ Record results systematically in a table.
✓ Sort 5+ materials into groups based on one shared property.
✓ Explain their classification using 'I put these together because...' sentence frames.
Assessment Note:
Cause & Effect Sheet, Texture Rating Sheet, running Season 1 Materials Properties Chart, oral classification task: given 5 household objects, sort by density (which would float?), exit ticket: draw and label one material property from today's experiment.