Changes in Matter Lesson Plan (TEKS 7.6C): A Complete 5E Lesson for Physical and Chemical Changes

Chris Kesler · 10 min read

The first year I taught physical vs. chemical change, I gave kids the definitions, listed the five signs of a chemical change on the board, and ran a couple of demos. By Friday, half the class was telling me that melting ice was a chemical change "because it looks different," and the other half thought burning paper was a physical change "because you could probably put it back together." That's when I realized definitions were doing nothing.

What turned it around was a single question I started drilling: "Is it still the same stuff?" Melted ice? Still water. Same stuff. Physical change. Burned paper? Black ash, smoke, gas, and heat. Definitely not paper anymore. Chemical change. Once kids had that filter, the five signs (gas, precipitate, color change, light/heat, smell) started to mean something instead of just being a list to memorize.

That's the core idea behind this 5E lesson for TEKS 7.6C. Students don't just memorize lists. They observe real changes, classify them, and explain back what makes a change physical or chemical.

⏱ About 10 class periods 📓 7th Grade Chemistry 🧪 TEKS 7.6C 🎯 Differentiated for D + M 💻 Print or Digital

Inside the Changes in Matter 5E Lesson

The 5E instructional model walks students through five phases: Engage, Explore, Explain, Elaborate, and Evaluate. It flips the traditional lecture-first sequence on its head. Students explore a concept hands-on before you ever explain it, which means by the time you do explain it, they have something to hook the vocabulary onto.

I switched to the 5E model years ago and stopped going back. Kids retain more, ask better questions, and stop staring at me waiting to be told the answer. The Changes in Matter 5E Lesson is built on this framework from start to finish. Here's how it plays out across the five phases.

🎯 Engage

I CAN... Distinguish between physical and chemical changes in matter.

Day one is a teacher-led hands-on "change station" rotation. Each group cycles through small change tasks at their tables: crumpling a piece of paper, dissolving a sugar cube in water, mixing baking soda and vinegar, cutting a slice of apple and watching it brown, stretching a rubber band, and tearing aluminum foil. At each station, students record exactly what they observed (sketch, words, color, gas, heat) on their student sheet. No vocabulary yet. Just observe and describe.

By the end of the period, kids have observation notes for every change on their student sheet, drawn in their own hand, and they can talk through which changes felt similar and which felt different. Nobody has heard the words "physical" or "chemical" yet. That's the point. They're walking into the rest of the unit with a working mental model, not a memorized definition.

What's included in the Engage:

Teacher directions for the change-station rotation
Printable student observation sheet
Answer key for the discussion questions
Four learning objective slides (standard verbatim, "Distinguish" verb highlighted, "I CAN...", and "WE WILL...")
An illustrated Chemistry Word Wall in English and Spanish covering the full unit vocabulary

🔬 Explore

📷 Explore image 1 — wide shot of Station Lab in action

The Changes in Matter Station Lab is the heart of the Explore phase. Students rotate through 8 stations (plus a 9th challenge station for early finishers) over one class period. The Station Lab is split into four input stations (where kids take in new information) and four output stations (where they show what they learned).

The four input stations:

🎬 Watch It! — Students watch a short video on physical and chemical changes and the five signs of a chemical change, then answer guided questions.
📖 Read It! — A one-page reading passage at two differentiated levels, with a Spanish version included.
🔬 Explore It! — Students carry out small physical and chemical changes (ice melting, baking soda + vinegar, cutting paper, mixing food coloring) and classify each one.
💻 Research It! — Reference cards with the five signs of a chemical change, examples, and a decision flowchart for classifying changes.

The four output stations:

📋 Organize It! — A 12-card sort where students place common changes (melting, burning, rusting, dissolving, cutting, baking) under Physical Change or Chemical Change.
🎨 Illustrate It! — Students draw a before-and-after picture of one physical change and one chemical change, labeling what changed in each.
✍️ Write It! — Three open-ended questions in complete sentences (this is where you see who really gets it).
📝 Assess It! — A short formative check with multiple choice and a fill-in-the-blank vocabulary paragraph.

📷 Explore image 2 — close-up of featured station (Explore It! or Organize It!)

Print and digital versions are both included. If you want the full breakdown of what happens at every single station, what students produce, and how to set it up, that's in our dedicated Station Lab post.

→ Read the full Changes in Matter Station Lab walkthrough 8 stations, materials list, teacher tips

The Station Lab is included in the full 5E lesson. You don't need to buy it separately if you're getting the whole unit.

📚 Explain

📷 Explain image 1 — Presentation slide screenshot

Here's the real payoff of doing the Engage and Explore before the Explain: by the time kids hit this phase, they've already watched, mixed, and classified real changes with their own hands. They have a working understanding before you ever start naming things. The discussions get deeper, the questions get sharper, and you spend less time defining and more time pushing their thinking.

The Changes in Matter Presentation walks 7th graders through the full scope of TEKS 7.6C, one concept at a time. The deck opens with a quick reset on what "changes in matter" even means (matter can change in size, shape, color, or chemical composition), and walks students through everyday examples: a snowball melting, a balloon deflating in the cold, leaves changing color in autumn, a pumpkin decomposing, a log turning black as it burns. From there it splits the world of change in two: physical changes and chemical changes.

📷 Explain image (middle) — Presentation slide screenshot (classification hierarchy, Essential Question, or category comparison)

Physical changes are changes where the chemical composition stays the same. The substance might look different, but the molecules inside don't change. Crushing, ripping, mixing, cutting, and bending are all physical changes. So are phase changes like melting, freezing, boiling, and condensation: ice melting into water is still H₂O, just rearranged. The deck makes the molecular picture explicit. In a solid, molecules are arranged in a regular, crystalline pattern. In a liquid, they slide past each other. In a gas, they spread far apart and move freely. Same molecules, different arrangement. Dissolving is also a physical change (sugar dissolving in water is still sugar and still water, you can evaporate the water and the sugar comes back).

A chemical change is different. Here the molecules of a substance actually become rearranged. Bonds break, new bonds form, and new molecules show up with new properties. Rusting, burning, decomposing, cooking, and digesting are all chemical changes. The deck includes a classic example: zinc (a shiny metal) plus hydrochloric acid (a clear liquid) creates bubbles, heat, and a brand new substance. Once the change happens, you can't easily go back to plain zinc and plain acid. Then the lesson lays out the five signs of a chemical change, which is what students will use as their detective toolkit: a gas is given off, light is produced, an odor is produced, a precipitate (solid from two liquids) forms, or energy is absorbed or released as heat. Endothermic reactions absorb heat and feel cool (baking soda and vinegar). Exothermic reactions release heat and feel warm (a hand warmer activating). Students see real examples of each and start to spot the signs on their own.

📷 Explain image 2 — Presentation slide screenshot

What makes the Changes in Matter Presentation different from a typical chemistry slideshow is that kids are doing something on almost every slide. It's not a lecture deck. It's a participation deck. "Your answer:" prompts appear on most slides, Brain Breaks reset attention every few slides (one has students list three physical changes they've already done that school day), and Quick Action INB tasks (categorizing fireworks vs. baking bread vs. ripping paper, Venn diagram drag-and-drops, and a phase-change molecule arrangement) show up throughout. Think About It prompts push deeper into bigger ideas like the ice cube on the counter (how it looks after 5 minutes vs. one day later) and explaining the difference between a teacher boiling water and a teacher reacting zinc with HCl. The deck closes with a Check for Understanding tied back to the Essential Questions: What are ways that matter can change? and What distinguishes a physical change from a chemical change in matter?

The Explain materials in this product include:

An editable 22-slide Presentation at two differentiated levels (Dependent and Modified), works in PowerPoint or Google Slides
A guided fill-in-the-blank student notes handout that mirrors the Presentation, with answer key
A Paper Interactive Notebook (English and Spanish) students cut, fold, and glue into their notebooks
A Digital Interactive Notebook at both levels with answer keys, for 1:1 classrooms or Google Classroom

The Explain runs across two class periods. The built-in Think About It prompts are where the real discussion happens, so let those breathe.

🛠️ Elaborate

Student Choice Projects rubric for TEKS 7.6C

The Elaborate phase is where students stretch what they learned about physical and chemical changes and put it into a project of their choosing. In this 7th grade chemistry lesson, that's a Student Choice Project board with six different project options plus a "design your own" pathway.

Students might document a typical school day as a stream of physical and chemical changes (with photos and a written explanation of each), design a kid-friendly cookbook where every recipe is labeled with the physical and chemical changes happening as you cook, build a poster of the five signs of a chemical change with three real-life examples for each sign, or record a short video walking through three changes in their kitchen and classifying each one with a justification. There are options for kids who love to write, kids who love to draw, kids who love to build, and kids who love to perform. Whatever the project, the point is the same: students apply physical change, chemical change, and the five signs to a real-world artifact instead of a worksheet.

Choice is the whole point. By letting students pick how they show their thinking, you get more authentic work for TEKS 7.6C and you actually get to see what they understand about changes in matter.

The rubric (the part teachers actually want)

Every project, no matter which option a student picks, is graded on the same 100-point rubric. Five categories at 20 points each:

Vocabulary (20 pts) — At least four words from the lesson are used in context.
Concepts (20 pts) — At least two key concepts from the lesson are referenced.
Presentation (20 pts) — The project grabs attention and is well-organized.
Clarity (20 pts) — Easy to understand. Free of typos.
Accuracy (20 pts) — Drawings and models are accurate. The science is right.

The rubric uses a minus / check / plus shorthand on every row so you can grade a stack of projects quickly without re-reading every criterion.

Two differentiated versions in one file

The standard version is for students ready for independent application of physical and chemical change ideas. The Reinforcement version is for students who need additional vocabulary or concept support. Three of the six options are swapped for projects with a tighter vocabulary tie-in, and "design your own" is replaced with "collaborate with the teacher" so kids aren't pitching cold.

✅ Evaluate

The Evaluate phase wraps the unit with a formal assessment. It's not all bubble-in. Several questions hand students before-and-after pictures of changes and ask them to classify each one and justify their answer with one of the five signs.

The full assessment has 12 questions across five formats:

Multiple choice (4 questions) covering physical change examples, chemical change examples, the five signs, and the difference between endothermic and exothermic reactions
Hotspot / visual (2 questions) where students circle the chemical change in a set of before-and-after images and identify the sign of chemical change shown
Multiselect (2 questions) where students pick all of the chemical changes (or all of the physical changes) from a mixed list of everyday examples
Short answer (2 questions) on what stays the same in a physical change vs. what changes in a chemical change, and on how to use the five signs to decide whether a change is chemical
Multipart scenario (2 questions) with a real-world example (a slice of bread being toasted, an ice cube melting, vinegar mixed with baking soda) where students classify the change, identify the sign(s), and explain whether it's reversible

A modified version is included for students who need additional support. Fewer multiple-choice distractors and sentence-starter scaffolds on the short-answer items.

If you've taught all five phases, this assessment shouldn't surprise anyone. It's a chance for kids to show you they get it.

How everything fits together

If you want the whole experience (Engage hook, the Station Lab as the Explore, the Explain day with Presentation and interactive notebook, the Student Choice Elaborate, and the Evaluate assessment all in one download), that's the Changes in Matter Complete 5E Science Lesson.

If you only need the one-day hands-on activity, the Station Lab works as a standalone. Most teachers buy the full 5E because the Station Lab works harder when it's bookended by a strong Engage and a follow-up Explain. But both are honest options.

Two options

Changes in Matter Complete 5E Lesson cover

Full 5E Lesson — ~10 class periods $13.20 Get the 5E Lesson

Just the Station Lab — 1–2 class periods $7.20 Get the Station Lab

What you need to teach Changes in Matter (TEKS 7.6C)

Materials beyond what's in the download:

Baking soda and vinegar for the chemical change demos (Engage and Station Lab)
Sugar cubes and water in clear cups for the dissolving demonstration
A few apples (sliced) and a piece of aluminum foil for the Engage rotation
Ziploc baggies or small plastic cups for combining baking soda + vinegar safely
Pencils, colored pencils or markers, and printed student pages
A device with internet for the Watch It! station and the slide deck

Standard covered: Texas TEKS 7.6C — Distinguish between physical and chemical changes in matter. See the full standard breakdown →

Grade level: 7th grade science

Time: About 10 class periods of 45 minutes each, done with fidelity. The product also ships with a compressed sample unit plan if you need to move faster.

Common misconceptions this lesson clears up

"Melting ice is a chemical change because the ice looks totally different afterward"
Looking different is not the same as being a different substance. Melted ice is still water. Same molecules (H₂O), just rearranged from a solid crystal pattern into a liquid where they can slide past each other. No new substance was formed, which means no chemical change. The test I teach 7th graders: "Is it still the same stuff?" If yes, it's a physical change, even if it looks completely different. Ice melting, sugar dissolving, paper crumpling, and water boiling are all physical changes for that reason.
"Burning paper is a physical change because the paper is still there as ash"
Burning is one of the clearest chemical changes there is. The original paper is gone. What you see at the end (black ash, smoke, carbon dioxide gas, water vapor, and heat) is a whole different set of substances than what you started with. The paper molecules broke apart and rearranged into new molecules with new properties. You can't take that ash and turn it back into paper, which is one of the giveaways that it's a chemical change. Three of the five signs (gas, light/heat, color change) are happening at the same time.
"If something changes color, it's always a chemical change"
Color change is one of the five signs of a chemical change, but it's not a guarantee on its own. Mixing red food coloring into water changes the color, but it's just a physical change because both the water and the dye are still chemically the same. They just got mixed. A real color-change chemical change involves new substances forming with the new color (like rust on iron or the brown on a sliced apple). Don't just look at the color. Ask whether new molecules with new properties showed up. That's what makes it chemical.
"Dissolving sugar in water is a chemical change because the sugar disappears"
The sugar doesn't disappear. It just breaks apart into particles too small to see and spreads evenly through the water. The molecules of sugar are still sugar molecules. The molecules of water are still water molecules. No new substance has formed, which means no chemical change. The proof: if you boil the water away, the sugar reappears at the bottom of the pan. Dissolving is a physical change because both substances keep their chemical identity.

What's included in the Changes in Matter 5E Lesson download

📷 Inside-the-product — add screenshot of Read It passage or sample answer sheet

When you buy the Changes in Matter Complete 5E Lesson, you get a single download with the whole unit:

✅ Engage materials — teacher directions, student observation sheet, answer key, four learning objective slides, illustrated Chemistry Word Wall (English + Spanish)
✅ The full Station Lab — 8 stations + 1 challenge, print and digital, two reading levels, Spanish Read It!
✅ Explain materials — editable 22-slide Presentation at two differentiated levels (with built-in Brain Breaks, Quick Action INB tasks, and Think About It prompts), guided fill-in-the-blank student notes handout with answer key, Paper Interactive Notebook (English + Spanish), Digital Interactive Notebook at two levels with answer keys
✅ Elaborate (Student Choice Projects) — 6 project options + design-your-own, plus a Reinforcement version with vocabulary-focused alternatives, 5-category rubric included
✅ Summative assessment — full 12-question version and modified version with sentence-starter scaffolds, both with answer keys
✅ Sample unit plan — day-by-day pacing guide

A couple of real-talk tips from running this lesson

1. Teach the "Is it still the same stuff?" test on Day 1.

Before any vocabulary, run a few examples on the board (ice melting, paper burning, sugar dissolving, iron rusting) and just ask kids: "Is it still the same stuff afterward?" That question carries them through the rest of the unit. Once they get the filter, the five signs of a chemical change start to mean something instead of being a list to memorize.

2. Do baking soda + vinegar in baggies, not open cups.

Open cups with vinegar across 8 lab tables = smell, spills, and lost minutes. Pre-portion baking soda inside small Ziploc baggies, then have kids pour the vinegar in and seal the bag. The gas inflates the bag visibly (great chemical-change visual) and cleanup is zero. Same science, none of the chaos.

3. Save 10 minutes at the end of the Station Lab day for a class debrief.

Ask: "What's one change from today that you're not 100% sure about, and why?" That five-minute conversation surfaces the trickiest examples (dissolving, melting, color change) and gives you a perfect runway into the Explain day.

Get the Changes in Matter 5E Lesson

Buy the full Changes in Matter 5E Lesson — $13.20

Or if you only need the one-day hands-on Station Lab:

Buy the Changes in Matter Station Lab — $7.20

(The Station Lab is included in the full 5E Lesson)

Frequently asked questions

Does this cover all of TEKS 7.6C?

Yes. The full standard is addressed across all five phases, with the distinguish-between verb baked into the Explore, Explain, and Elaborate activities. Physical changes, chemical changes, phase changes, and the five signs are all covered.

What do my students need to know before this lesson?

A basic understanding of matter, atoms, and molecules from earlier grade-level standards (TEKS 7.6A and 7.6B help). If your kids can describe what an atom is and what a molecule is, they're ready.

How long does it take to teach?

Done with fidelity, about 10 class periods of 45 minutes each: one day for the Engage, two days for the Station Lab, two days for the Presentation and Interactive Notebook, three days for the Student Choice Project, and one to two days for review and the assessment. A compressed sample plan is included in the file if you need to move faster.

Do I need special supplies?

Just baking soda, vinegar, sugar cubes, a few apples, aluminum foil, and small Ziploc baggies. All standard pantry items. No real chemicals.

Does this work for digital classrooms?

Yes. Every component has a digital version. The Station Lab is fully digital-ready (Google Slides), the Presentation works in Google Slides, and the Student Choice Projects can be submitted as videos, slide decks, or written work.

Is this 5E lesson aligned to NGSS too?

It aligns with MS-PS1-2 (analyzing and interpreting data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred). Built TEKS-first, but the standards overlap.