Evidence of Chemical Changes Activity: 8 Hands-On Stations for Teaching Color Change, Gas, Temperature, Light, and Precipitates (TEKS 6.6E)

Chris Kesler · 8 min read

Drop a glow stick in front of a 6th grader and snap it. Their eyes go wide. Then ask, "Did the glow stick just have a chemical change?" Half the kids will say yes because of the light. The other half will say no, the glow stick was already a glow stick. The light just turned on. That gap is the whole point of TEKS 6.6E. Kids have to learn the four signs that point to a new substance forming, and the difference between a chemical change (which makes new stuff) and a physical change (which only changes shape, size, or state).

The standard asks students to identify the evidence of chemical change: production of a gas, a temperature change, the formation of a precipitate, and a color change. Light release is the bonus fifth clue from the Read It! passage. They have to use these signs as detectives, looking at any reaction and arguing whether a new substance has formed.

The Evidence of Chemical Changes Station Lab for TEKS 6.6E closes that gap in one to two class periods. Kids run four real reactions: yeast plus hydrogen peroxide in a sealed bag (gas formation and a warm bag), shaving cream plus baking soda to make instant snow (texture change), baking soda plus dish soap plus lemon juice in a beaker (gas, temperature drop, and a chemical reaction kids can watch), and snapping a glow stick (light). They examine reference cards on all four indicators, sort 12 cards into chemical vs. physical change, and finish by drawing four real-world examples (vinegar/baking soda, a bioluminescent fish, browning fruit, a bonfire) labeled with the type of evidence they show.

⏱ 1–2 class periods 📓 6th Grade Science 🧪 TEKS 6.6E 🎯 Built-in differentiation 💻 Print or Digital

8 hands-on stations for teaching evidence of chemical changes

A station lab is a student-led activity where small groups rotate through 8 stations (plus a 9th challenge station for early finishers) at their own pace during one to two class periods. You become a facilitator instead of a lecturer. You walk around, spot-check, and break misconceptions while kids work through the rotation.

The Evidence of Chemical Changes Station Lab has four input stations (where students take in new info on the four indicators of chemical change) and four output stations (where they show what they learned). Here's what's at each one.

📷 Image slot 1 — add screenshot

📷 Image slot 2 — add screenshot

4 input stations: how students learn evidence of chemical changes

🎬 Watch It! —

A short YouTube video introduces bioluminescence as a real-world chemical change. Kids answer three questions: what bioluminescence is, how the light is produced, and how scientists are using bioluminescence to help humans (medical imaging, drug research, etc.). Visual learners hook in fast at this station because the video shows actual glowing fish and fireflies, which makes "light release as evidence of chemical change" stick before they ever see it on a worksheet.

📖 Read It! —

A one-page passage called "Chemical Reactions Detective" frames the lesson around a detective hunting for clues. Five clues map to the five signs of chemical change: fireworks (color change), instant ice pack (temperature change), bread bubbles (gas formation), kidney stones (precipitate), and a sparkler (light). Vocabulary is bolded throughout (chemical change, color change, thermal energy, gas formation, precipitates). Three multiple-choice questions follow, plus the vocab notes section. Comes in two reading levels (Dependent and Modified) plus a Spanish version.

🔬 Explore It! —

This is the heart of the lab. Four hands-on reaction tests. Test 1: ¼ teaspoon of yeast and 2-3 mL of hydrogen peroxide in a sealed plastic bag. Kids see foam and feel the bag warm up (gas + temperature). Test 2: ¼ cup of baking soda kneaded into 3 cups of shaving cream to make instant snow (texture change, technically a physical change, which sets up the compare-contrast question). Test 3: 5 g baking soda + 5 mL water + dish soap + 15 mL lemon juice in a beaker. Kids feel the cooling effect, see foam shoot up, and watch the reaction unfold. Test 4: snap and shake a glow stick (light). Each test ends with the same question: do you believe a chemical change occurred?

💻 Research It! —

Students examine 11 reference cards: definitions of chemical change and observation, four indicator cards (gas formation, color change, thermal energy, precipitate, light), an Energy Change diagram showing reactions that absorb heat (cooler than surroundings) vs. reactions that release heat (hotter than surroundings), and four photo cards (rusty nails for color change, a yellow precipitate cloud, foam for gas formation, glow sticks for energy/light). Seven questions follow, including identifying which examples show temperature changes and giving an example of a chemical reaction that shows multiple types of evidence.

📷 Featured station deep-dive — add screenshot of the Explore It! task card

4 output stations: how students show what they learned

📋 Organize It! —

A two-column card sort. Kids sort 12 cards into EVIDENCE OF A CHEMICAL CHANGE and EVIDENCE OF A PHYSICAL CHANGE columns. Chemical: production of a gas, change in thermal energy, a new substance is formed, crystals growing in a solution, light being produced, fruit turning brown. Physical: condensation on the glass, rough wood sanded smooth, a glowing piece of heated metal (this one's tricky, the heat caused glow without forming a new substance), water heated into steam, rough edges of cut metal, a white t-shirt dyed green. The contrast cases catch kids who think every color change is chemical. Easy to spot-check at a glance.

🎨 Illustrate It! —

Students draw four examples of possible chemical changes and label each with the type of evidence: a beaker of vinegar and baking soda (gas formation), a bioluminescent fish (light), a piece of fruit exposed to air (color change), and a bonfire (multiple, light + heat + color). The drawing forces them to remember that a single reaction can show more than one indicator at once, which is the key insight for the Assess It! station. Even kids who say "I can't draw" surprise themselves here.

✍️ Write It! —

Three open-ended questions: explain how the observable characteristics of fireworks provide evidence of a chemical change, describe a precipitate and give two examples, and explain how baking bread (with the dough rising from yeast and ending up as a baked solid) is a chemical change. Forces kids to apply the indicators to brand-new scenarios. This is the writing practice middle schoolers need and rarely get in science class.

📝 Assess It! —

Eight multiple-choice and fill-in-the-paragraph questions tied to TEKS 6.6E vocabulary (chemical change, color change, thermal energy, gas formation, precipitates). Includes which option is evidence of a chemical change (vinegar + baking soda foaming vs. squeezing a marshmallow vs. carving wood vs. ice melting), the trick question about bonfires (the wood expanding and cracking from heat is NOT chemical evidence, the smoke and heat and light are), and which of four options is a chemical change (chocolate milk, baked cake, dyed shirt, sugar water). The fill-in paragraph weaves all five vocabulary words together. If you're grading the lab, this is the easiest station to grade.

Bonus Challenge It! station for early finishers

🏆 Challenge It! —

Four optional extensions: build a crossword puzzle with chemical change vocabulary, design a board game where players use chemical change knowledge to advance, run a scavenger hunt around the classroom finding examples of chemical change evidence (with drawings and descriptions), or write a poem or song about evidence of chemical changes. Requires teacher approval before they start.

How this fits into a complete evidence of chemical changes unit

This Station Lab is the Explore day of our full Evidence of Chemical Changes Complete 5E Lesson for TEKS 6.6E. The complete two-week unit follows the 5E method of instruction and includes an Engage hook, the Evidence of Chemical Changes Station Lab for Explore, PowerPoint slides and interactive notebook pages for Explain, student choice projects to Elaborate, and an Evaluate assessment.

Most teachers grab the full 5E because the Station Lab lands hardest with the days around it. But if you just need a strong hands-on day on chemical change indicators, the Station Lab on its own does the job.

Two options

Evidence of Chemical Changes 5E Lesson cover

Full 5E Lesson $13.20 Get the 5E Lesson

Evidence of Chemical Changes Station Lab cover

Just the Station Lab $7.20 Get the Station Lab

Materials needed to teach evidence of chemical changes

Materials beyond what's in the download:

Test 1: a small ziploc bag, ¼ teaspoon of yeast, 2-3 mL of hydrogen peroxide in a pipette per group.
Test 2: a small bowl, ¼ cup of baking soda, and 3 cups of shaving cream per group (the cheap aerosol kind works best).
Test 3: a 250 mL beaker, 5 g of baking soda, 5 mL of water, a couple drops of liquid dish soap, and 15 mL of lemon juice per group.
Test 4: one new glow stick per group rotation. Buy a 12-pack at a party store before the unit.
Paper towels and a trash bin nearby. The shaving cream test is messy in the best way.
Colored pencils or markers for the Illustrate It! station drawings.
Pencils and the printed answer sheets (included)
A device with internet for the Watch It! station

Standard covered: Texas TEKS 6.6E —

Identify the formation of a new substance by using the evidence of a possible chemical change such as production of a gas, change in thermal energy, production of a precipitate, and color change. Supporting Standard.

See the full standard breakdown →

Grade level: 6th grade physical science

Time: One to two class periods (45–110 minutes total). Plan for two periods the first time you run a station lab.

Common student misconceptions this lab fixes

"If something changes color or makes bubbles, that always means a chemical change happened."
This is the big one. Sixth graders learn the four indicators and start labeling every change as chemical. The Organize It! card sort fixes this directly. The card "a glowing piece of heated metal" looks like it could be chemical (light is involved!), but the metal is still the same metal, just hotter. It's a physical change. The card "water heated up and turned into steam" makes bubbles, but the steam is still water. Same with "a white t-shirt dyed green." The shirt's color changed, but no new substance formed (the dye just attached to the fabric). The Read It! passage drives the deciding rule home: "if a new substance is formed, then a chemical change has taken place." Indicators are clues, not guarantees.
"Chemical changes are loud and dramatic. Quiet changes are physical."
Many 6th graders only count explosions, fires, and fizzy reactions as chemical changes. The Explore It! station catches this with the glow-stick test. There's no fizz, no boom, no bubbles. Just a quiet snap and a glow. But the glow stick contains two separate substances that form a new substance when they mix, which is exactly a chemical change. The Read It! passage uses fruit turning brown as another quiet example. Apple slices in your lunch don't make any noise, but they're undergoing a chemical change with oxygen. The Illustrate It! station forces kids to label a quiet example (the bioluminescent fish) and a loud example (the bonfire) with the same evidence rule, which proves that volume isn't the deciding factor.
"If a reaction feels cold, it can't be a chemical change. Chemical changes always release heat."
Lots of 6th graders walk in thinking chemical = warm. The Explore It! Test 3 catches it. When kids add lemon juice to baking soda, dish soap, and water in a beaker, the reaction actually feels colder. Their hand around the beaker registers a temperature drop. That's because the reaction absorbs thermal energy from the surroundings (the same thing that happens in an instant ice pack). The Research It! Energy Change card shows both possibilities: reactions that release heat (hotter than surroundings) and reactions that absorb heat (cooler than surroundings). Both are chemical changes. The change in thermal energy is the indicator, not the direction.

What you get with this evidence of chemical changes activity

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

When you buy the Station Lab, you get a single download with everything you need:

Print version at two reading levels (Dependent for on-grade, Modified for additional support) plus a Spanish Read It! passage
Digital version as PowerPoint files (works in Google Slides too) at both levels for 1:1 classrooms or Google Classroom
Teacher Directions and Answer Key for both versions, all keys included
Station task cards ready to print, laminate, and drop in baskets at each station
Reference cards for the Research It! station (definition cards, indicator cards for gas, color, thermal energy, precipitate, and light, plus the Energy Change diagram)
Sort cards for the Organize It! station (12 example cards plus two header cards for chemical vs. physical change)
Student answer sheets for each level

Tips for teaching evidence of chemical changes in your 6th grade classroom

Two things make this lab go smoother the first time:

1. Pre-portion the yeast and lemon juice into single-use cups.

The Explore It! station has four reactions, and Tests 1 and 3 use small amounts of fragile ingredients (yeast for foaming, lemon juice for the cold reaction). The first time I ran a similar setup, kids dumped half the yeast container into one bag and ran out by group three. Now I pre-portion ¼ teaspoon of yeast into one small cup per group and 15 mL of lemon juice into another small cup per group, both labeled with the test number. Total prep time: 10 minutes the morning of class. Saves the rest of the period.

2. Run the shaving cream test on a tray or tablecloth.

Test 2 (instant snow) is messy in the best possible way. Kids knead 3 cups of shaving cream into baking soda with their hands, and pieces of foam end up on tables, on chairs, and occasionally on neighbors. Putting a cheap plastic tablecloth or a cafeteria tray under the bowl contains 90% of the mess and makes cleanup a 30-second wipe instead of a 5-minute scrub. Have a roll of paper towels at the station for hand-drying after the activity.

Get this evidence of chemical changes activity

Evidence of Chemical Changes Station Lab for 6th grade physical science — TEKS 6.6E

Buy the Station Lab — $7.20

Or if you want the full two-week experience with the Engage hook, Explain day, Elaborate extension, and Evaluate assessment all included:

Buy the full 5E Complete Lesson — $13.20

(Station Lab is included)

Frequently asked questions

What does TEKS 6.6E cover?

Texas TEKS 6.6E asks 6th grade students to identify the formation of a new substance using the evidence of a possible chemical change: production of a gas, change in thermal energy, formation of a precipitate, and color change. Students should be able to look at any reaction or scenario, name which evidence indicators are present, and decide whether a chemical change has occurred. The standard pairs naturally with the rest of the 6.6 matter and energy strand.

Is this kids' first time meeting chemical vs. physical change?

Yes for most 6th graders. They've seen examples of physical changes (ice melting, paper cutting) since elementary school but "chemical change" with formal indicators is brand new. The Read It! detective passage introduces all five clues, the Research It! reference cards show particle-level diagrams, the Explore It! station gives four real reactions to observe, and the Organize It! card sort tests whether they can distinguish chemical from physical with 12 different examples.

How long does this evidence of chemical changes activity take?

One to two class periods (45 to 110 minutes total). The Explore It! station's four reactions are the longest piece, so plan for two periods the first time you run a station lab. Once your class has the rotation routine down, most groups can finish all 8 stations in one period.

Are the Explore It! reactions safe for 6th graders?

Yes, all four are designed to be classroom-safe with normal lab procedures. Hydrogen peroxide is the standard 3% drugstore concentration. The lemon juice and baking soda reaction is exactly what kids do at home in a kitchen-science volcano. The shaving cream is the cheap aerosol kind. The glow stick is sealed. Have students wear safety goggles for Tests 1 and 3 (foam and cold liquid can splash) and you're set.

Can I use this in a 1:1 digital classroom?

Yes. The full digital version (PowerPoint or Google Slides) works in 1:1 classrooms and Google Classroom. Students drag digital cards for the Organize It! sort and complete the Illustrate It! drawings on a digital canvas. The Explore It! reactions are harder to digitize, but you can substitute reaction videos or PhET simulations if you don't have the supplies. The hands-on tests are still the strongest version, so I'd run them when you can.