Evidence of Chemical Changes Lesson Plan (TEKS 6.6E): A Complete 5E Lesson for Color, Gas, Precipitate, and Temperature Clues

Chris Kesler · 10 min read

The first year I taught chemical changes, I listed the four signs on the board (color change, gas production, precipitate, temperature change), gave a notes packet, and quizzed on Friday. Kids could write down the list and still pour blue food coloring into water and call it a chemical change. They were collecting words, not evidence.

The fix that actually worked was building a detective notebook with each kid. Every demo I ran, they had to write down every observation in a column, then decide "chemical change" or "physical change" and justify it with the specific clues they saw. Baking soda and vinegar? Gas production and a temperature drop, both clues. Crumpling a piece of foil? No clues at all. They had to point to evidence before they could make a call. By the end of the unit, "evidence" was a word they used naturally.

That's the spine of this 5E lesson for TEKS 6.6E. The verb in the standard is identify the evidence. You can't identify what you've never had to look for. Kids have to run the demos and collect the clues themselves.

⏱ 10 class periods 📓 6th Grade Chemistry 🧪 TEKS 6.6E 🎯 Differentiated for D + M 💻 Print or Digital

Inside the Evidence of Chemical Changes 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 Evidence of Chemical Changes 5E Lesson is built on this framework from start to finish. Here's how it plays out across the five phases.

🎯 Engage

📷 Engage image — objective slide OR word wall card

Day one is a teacher-led detective demo using baking soda and vinegar in a clear cup with a thermometer in it. Each student gets a detective notebook page with three columns: Observations, Evidence Detected, and My Verdict (chemical or physical change). They record what they see, smell, and read on the thermometer as the reaction happens. Bubbles form, the temperature drops, the fizz quiets, and a sentence makes its way into every notebook: "I think this is a chemical change because..."

By the end of the period, kids have collected real evidence from a real demo and made a justified claim in their own words. Nobody has heard a lecture on the four signs yet, and that's the point. They walk into the rest of the unit already knowing what "evidence" means in this room.

What's included in the Engage:

Teacher directions for the baking soda and vinegar detective demo
Printable student detective notebook page
Answer key for the discussion questions
Four learning objective slides (standard verbatim, "Identify the evidence" 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 Evidence of Chemical Changes 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 that walks through the four signs of a chemical change with real-world examples, then answer guided questions.
📖 Read It! — A one-page reading passage at two differentiated reading levels, with a Spanish version included.
🔬 Explore It! — The hands-on heart of the lab. Students run two small bench-top reactions (baking soda + vinegar in one cup, food coloring + water in another) and record evidence in a side-by-side detective sheet to decide which is a chemical change and which isn't.
💻 Research It! — Reference cards with the four signs of chemical change, examples of physical changes, and the difference between mixing and reacting.

The four output stations:

📋 Organize It! — A 12-card sort where students place real-world examples (rusting, melting ice, baking a cake, tearing paper, dissolving sugar, food coloring in water) under chemical change or physical change.
🎨 Illustrate It! — Students draw a four-panel poster showing each sign of chemical change (color, gas, precipitate, temperature) with a labeled real-world example.
✍️ Write It! — Three open-ended questions in complete sentences (this is where you find out who actually 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 Evidence of Chemical Changes 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 payoff of doing the Engage and Explore before the Explain: by the time kids hit this phase, they've already run small reactions and collected evidence with their own hands. They have a working framework before you ever start naming things. The discussions get sharper, the questions get better, and you spend less time defining and more time pushing their thinking.

The Evidence of Chemical Changes Presentation walks 6th graders through the full scope of TEKS 6.6E, one concept at a time. The deck opens with the central distinction students need to lock in: a physical change changes how something looks or feels but not what it's made of (tearing paper, melting ice, crumpling foil), while a chemical change turns one or more substances into one or more different substances. The starting material and the ending material are not the same stuff. New particles have formed.

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

From there the deck digs into the four signs the standard names by name. Color change that can't be explained by simple mixing is a clue. A shiny iron nail turning dull and reddish from rust is a real chemical color change. Stirring blue food coloring into water is not, because that's just mixing two things that were both there before. Production of a gas from a reaction is a clue, but students have to ask: is gas being made from scratch, or just released from something it was already inside? Soda bubbles are dissolved carbon dioxide escaping, not a reaction. Baking soda and vinegar make brand new carbon dioxide.

Formation of a precipitate is when a solid appears out of two clear liquids that didn't have any solid in them to begin with. Pouring two clear solutions together and watching a cloudy solid drop out is one of the most dramatic chemical change clues, and the deck shows it with side-by-side images. Changes in temperature that aren't caused by an outside heater or cooler are the fourth clue. Mixing baking soda and vinegar gets colder because the reaction itself absorbs energy. Steel wool dipped in vinegar gets warmer because the reaction itself releases energy. No stove, no ice, just the reaction doing the work.

📷 Explain image 2 — Presentation slide screenshot

The Presentation closes by hammering on the most important point in the whole unit: these signs are evidence, not proof. One sign on its own is a strong clue, not a guarantee. Multiple signs showing up together make the case much stronger. The deck walks students through real-world examples that students see every day (rusting metal, burning wood in a fire, baking a cake, an antacid tablet dropped in water) and asks them to point to which of the four signs they would expect for each. That's the "identify the evidence" verb of TEKS 6.6E in action.

What makes this deck different from a typical chemistry slideshow is that kids are doing something on almost every slide. "Your answer:" prompts appear regularly, Brain Breaks reset attention, Quick Action INB tasks (a chemical vs. physical card sort, a four-signs labeling activity, a detective notebook entry for a mystery demo) keep students engaged, and Think About It prompts push deeper into bigger ideas like why a chemical change is usually harder to reverse than a physical change. The deck closes with a Check for Understanding tied back to the Essential Question: What evidence helps us know if a chemical change has happened?

The Explain materials in this product include:

An editable 21-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 Think About It prompts are where the real discussion happens, so let those breathe.

🛠️ Elaborate

📷 Elaborate image — Student Choice Project board or sample student work

The Elaborate phase is where students take what they learned about chemical changes and apply it to a project of their own choosing. In this 6th grade chemistry lesson, that's a Student Choice Project board with six different project options plus a "design your own" pathway.

Students might bake a batch of brownies and write a detective report on every chemical change they see along the way, design a comic strip where a science detective solves a mystery using the four signs, or film a short video where they walk through three demos and decide chemical or physical for each. 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 evidence of chemical changes 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 6.6E and you actually get to see what they understand about how to spot a chemical change.

The rubric (the part teachers actually want)

Every project, no matter which option a student picks, is graded on the same rubric. Five categories at 20 points each: Vocabulary, Concepts, Presentation, Clarity, and Accuracy. 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. 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 a demo description or an image and ask them to identify the evidence of a chemical change and justify their thinking.

The full assessment has 12 questions across five formats:

Multiple choice (4 questions) covering the four signs of chemical change and the difference between chemical and physical changes
Hotspot / visual (2 questions) where students circle the image that shows evidence of a chemical change and describe which sign they see
Multiselect (2 questions) where students pick all of the events from a list that are chemical changes
Short answer (2 questions) on the difference between a color change from mixing food coloring and a color change from rust
Multipart scenario (2 questions) built around a teacher demo where students list every piece of evidence they would look for, identify which signs are present, and make a final call

A modified version is included for students who need additional support, with 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 Evidence of Chemical Changes 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

Evidence of Chemical Changes Complete 5E Lesson cover

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

Evidence of Chemical Changes Station Lab cover

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

What you need to teach Evidence of Chemical Changes (TEKS 6.6E)

Materials beyond what's in the download:

Baking soda and white vinegar for the Engage detective demo and the Station Lab Explore It! station (one box and one bottle covers a whole class)
Clear plastic cups for the demos so kids can see the reaction from the side
Thermometers (one per group is plenty) so students can record the temperature change during the baking soda and vinegar reaction
Food coloring for the contrast demo (a chemical change vs. just mixing)
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 6.6E — Identify the evidence of a chemical change, including changes in color, production of a gas, formation of a precipitate, and changes in temperature. See the full standard breakdown →

Grade level: 6th 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

"Any color change means a chemical change happened"
Students hear "color change" and lock in on it. But stirring blue food coloring into water turns the water blue, and nothing chemical has happened. That's just mixing. The kind of color change that signals a chemical change is one that can't be explained by mixing two colors. A shiny metal turning dull and reddish from rust is a real chemical color change.
"Bubbles always mean a chemical change"
Bubbles come from any kind of gas, including a gas that was already in the liquid. When you open a soda, the bubbles are dissolved carbon dioxide escaping. No chemical change, just a physical release. When baking soda meets vinegar, however, the bubbles are brand-new carbon dioxide being created. Students have to ask: is gas being produced from a reaction, or released from something it was already in?
"If the temperature changes, the heat must be coming from somewhere outside"
Students are used to thinking heat comes from a stove or a sun. The idea that a reaction itself can release or absorb heat is new. Mixing baking soda and vinegar gets colder without anyone adding ice. Steel wool dipped in vinegar gets warmer without a heater. The reaction itself is the source of that temperature change, and that's the clue they should catch.
"Chemical changes can be reversed if you try hard enough"
Students sometimes assume every reaction can be undone. Most chemical changes are difficult to reverse with the simple methods used in a classroom. You can unburn toast only in very specialized ways, not by scraping or rinsing it. Physical changes (ice melting, water evaporating) are usually easy to reverse. Chemical changes usually aren't, which is another signal that something new has formed.

What's included in the Evidence of Chemical Changes 5E Lesson download

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

When you buy the Evidence of Chemical Changes Complete 5E Lesson, you get a single download with the whole unit:

✅ Engage materials — teacher directions for the baking soda + vinegar detective demo, student detective notebook page, 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 21-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. Set up the baking soda + vinegar detective demo as the first thing kids see on Day 1.

If you start with definitions, kids are bored before the demo. If you start with the demo, kids are leaning in by the time you name the four signs. Let the demo do the work for you.

2. Pre-portion the baking soda and vinegar into small cups before the Station Lab.

If you set out a whole box of baking soda and a gallon of vinegar at the Explore It! station, you'll spend the period refereeing the volcano arms race. Pre-portion one teaspoon of baking soda and a quarter cup of vinegar per group and kids will focus on the evidence instead of the explosion.

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

Ask: "What's the difference between blue food coloring in water and rust on a nail? Both involve color, so why is one a chemical change and one isn't?" That question pulls the whole standard into focus.

Get the Evidence of Chemical Changes 5E Lesson

Buy the full Evidence of Chemical Changes 5E Lesson — $13.20

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

Buy the Evidence of Chemical Changes Station Lab — $7.20

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

Frequently asked questions

Does this cover all of TEKS 6.6E?

Yes. The full standard is addressed across all five phases, with all four signs named in the standard (color, gas production, precipitate, temperature) baked into the Engage, Explore, Explain, and Evaluate.

What do my students need to know before this lesson?

A basic understanding that matter is made of particles and that mixtures and pure substances are different (carried in from 6.6A and 6.6B). If they can describe what a mixture is in a sentence, 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 detective demo, 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. The product also ships with a compressed sample unit plan if you need to move faster.

Do I need special supplies?

Just baking soda, white vinegar, clear cups, a few thermometers, and food coloring. Everything is kitchen-safe and easy to source.

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 most directly 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 heavily.