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Free scope and sequences, TEKS breakdowns, phenomenon ideas, and engagement activities for the 2024 Texas science standards.

I'm Chris Kesler, a former award-winning Texas middle school science teacher. This is the site I wish I'd had in the classroom. One hub with TEKS breakdowns, scope and sequences, phenomenon starters, engagement ideas, and resources, all aligned to the standards you actually teach.

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TEKS Details | Texas Hub Module

7th Grade TEKS Standards

Click any standard to see what it means, how to teach it, where students get stuck, and aligned resources.

TEKS S.7.6C • Matter & Properties

Changes in Matter

The Standard

"Distinguish between physical and chemical changes in matter, including evidence of chemical change such as the production of a gas, a change in temperature, a change in color, the formation of a precipitate, or the production of light."

💡 What This Standard Actually Means

The Key Verb

"Distinguish". Students are telling physical and chemical changes apart and spotting the signs that a chemical change has happened. The standard also uses the word "including", which signals where to focus your students: the production of a gas, a change in temperature, a change in color, the formation of a precipitate, and the production of light. Students should be able to identify and explain each of these as evidence of a chemical change.

A physical change changes the form or appearance of matter, but the substance itself stays the same. Melting ice, ripping paper, dissolving salt in water, and breaking a pencil are physical changes. The stuff is still the same stuff, just in a different shape, size, or state. Physical changes can often be reversed.

A chemical change produces a new substance with different properties. The original atoms rearrange and form new bonds. Rusting iron, burning wood, digesting food, and baking a cake are chemical changes. Once the change happens, you can't easily get the original substances back. Scientists also call a chemical change a chemical reaction.

When you're trying to tell them apart, look for evidence. A bubbling reaction that produces gas, a sudden temperature jump or drop, an unexpected color change, a solid forming when you mix two clear liquids (called a precipitate), or a glow or flame all point to a chemical change. Important note for students: more than one of these signs happening at the same time makes chemical change much more likely. A color change by itself is not always chemical. Mixing food coloring in water changes the color, but it's still a physical change. Teach students to look at multiple pieces of evidence together.

💬 From Chris's Classroom

I used to lose kids on this one because I'd give them a list of signs and expect them to memorize it. What actually worked was running a quick demo day where I'd do a bunch of small changes back to back. Crushed an Alka-Seltzer tablet into water (gas, fizzing). Mixed vinegar and baking soda (gas, temperature drop). Folded and ripped some paper (nothing, it's physical). Melted a piece of chocolate in my hand (state change, physical). After each one, kids wrote down what evidence they saw and voted on physical or chemical. By the end, they had the signs memorized without ever being told to memorize them.

⚠️ Misconceptions Your Students May Have

These are some of the most common misconceptions. Knowing what to look for can help you get ahead of them.

"If something changes color, it's a chemical change"

✓

A color change can be evidence of a chemical change, but not every color change is chemical. Food coloring dropped into water changes the color without forming a new substance, so it's still a physical change. The trick is to look for a color change plus another sign (gas, temperature change, precipitate). Multiple signs together make a chemical change much more likely.

"Melting is a chemical change because the substance looks different"

✓

Melting, freezing, boiling, and dissolving are all physical changes, not chemical. An ice cube melting into water is still water. Its molecules didn't change. They just have more energy and move around more freely. A chemical change requires new substances to form.

"In a chemical change, atoms disappear or new atoms are created"

✓

Atoms are rearranged in a chemical change, not created or destroyed. This is called the law of conservation of mass. If you could weigh everything that goes into a reaction and everything that comes out, the mass would be the same. If gas escapes during a reaction, the mass seems to drop, but that gas still has mass. The atoms are just somewhere else now.

"Cutting, tearing, and crushing are chemical changes because the thing looks different"

✓

Cutting paper gives you smaller pieces of paper. Crushing an aluminum can gives you a smaller-looking can. No new substance forms. The substance is just in a different shape or size. These are physical changes even though the thing looks very different than it did before.

📓 Teaching Resources for 7.6C

These resources are aligned to this standard.

Complete 5E Lesson

Changes in Matter Complete Science Lesson

The full unit for 7.6C: differentiated station labs, editable presentations, interactive notebooks (English + Spanish), student-choice projects, and assessments. Built on the 5E model.

⏱ Best for: Full unit coverage • Multiple class periods

Station Lab

Changes in Matter Station Lab

9-station hands-on lab covering physical and chemical changes with input stations (Explore It!, Watch It!, Read It!, Research It!) and output stations (Organize It!, Illustrate It!, Write It!, Assess It!). Print and digital. English and Spanish.

🔬 Best for: Core instruction • 1-2 class periods

Student Choice Projects

Changes in Matter Student Choice Projects

Choice board with nine project options plus a "design your own" pathway. Students demonstrate their understanding of physical and chemical changes through writing, building, illustrating, presenting, or digital formats.

🎓 Best for: Project-based assessment • 2-3 class periods

🌎 Phenomenon Ideas for 7.6C

Use these real-world phenomena to anchor your lesson. Show students the phenomenon first, let them wonder, then build toward Changes in Matter as the explanation.

🔎

Phenomenon 1

Batter Becomes Cake

Cake batter is a thick, sticky liquid you could pour into a bowl. You pop it in the oven, and 30 minutes later, it's a fluffy, spongy cake that holds its shape. No matter what you do after that, you can't un-bake the cake and get the batter back. The batter is chemically transformed by the heat and the reactions inside it.

💬 Discussion Prompt

"What evidence did you see that a chemical change happened in the oven? Why can we not un-bake the cake to get the original batter back?"

🔎

Phenomenon 2

A Rusty Bike Left Outside

A shiny silver bike gets left out in the rain for a few weeks. The next time you look, the chain and frame are covered in orange-brown rust. The iron in the metal is reacting with oxygen in the air and water, forming a new substance called iron oxide. The rust doesn't have the same properties as the metal underneath. It flakes off, it's weaker, and it doesn't go back to being metal.

💬 Discussion Prompt

"What evidence shows that rust is a new substance and not just dirty metal? Why is this a chemical change rather than a physical one?"

🔎

Phenomenon 3

Alka-Seltzer in Water

Drop an Alka-Seltzer tablet into a glass of water. Bubbles erupt right away, the tablet starts to disappear, and if you're watching closely, the water feels slightly cooler. A gas is being produced (carbon dioxide), which is strong evidence of a chemical change. Multiple signs at once make the call clear.

💬 Discussion Prompt

"Which signs of chemical change did you observe? How does seeing more than one sign help you decide whether a change is physical or chemical?"

💡 Free Engagement Ideas for 7.6C

Baking Soda & Vinegar Station

In a clear cup, have students add 2 tablespoons of baking soda. Then pour in a splash of vinegar. They'll see bubbling (gas), feel the outside of the cup (temperature drop), and can touch the liquid left over to notice it's thinner than before. Students list every sign of chemical change they observed.

Materials: Baking soda, vinegar, clear plastic cups, measuring spoons

Physical or Chemical? Carousel

Set up five stations: tearing paper, dissolving sugar in water, mixing baking soda and vinegar, melting chocolate in a warm hand, and burning a tiny piece of paper (teacher only, in a ceramic dish). Students rotate and record evidence at each stop, then decide physical or chemical and justify with the specific signs.

Materials: Paper, sugar, water, baking soda, vinegar, chocolate chips, matches and ceramic dish (teacher demo)

Steel Wool & Vinegar Heat Test

Soak a small piece of steel wool (from the hardware store) in white vinegar for a minute, then wrap it around a thermometer and put both inside a dry glass. Watch the temperature rise over a few minutes. The iron in the steel wool reacts with oxygen faster once the vinegar removes its protective coating. A clear temperature change as evidence of a chemical reaction.

Materials: Steel wool (non-soap type), white vinegar, thermometer, glass jar

Conservation of Mass Check

Place a sealable plastic bag on a balance. Put about half a teaspoon of baking soda inside, then tuck a small cup of vinegar into one corner without spilling. Record the mass. Seal the bag tightly and tip it to mix. The bag will puff up with gas. Measure the mass again. It stays the same, even though a chemical change happened, because mass is conserved.

Materials: Zip-top plastic bags, baking soda, vinegar, small paper cups, a kitchen or classroom balance

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Texas Science Teacher Resource Hub

🚀 Jump to Your Grade

7th Grade TEKS Standards

Changes in Matter

💡 What This Standard Actually Means

⚠️ Misconceptions Your Students May Have

📓 Teaching Resources for 7.6C

🌎 Phenomenon Ideas for 7.6C

Batter Becomes Cake

A Rusty Bike Left Outside

Alka-Seltzer in Water

💡 Free Engagement Ideas for 7.6C

Baking Soda & Vinegar Station

Physical or Chemical? Carousel

Steel Wool & Vinegar Heat Test

Conservation of Mass Check

Year-at-a-Glance Pacing Guides

Trusted Across Texas

Texas Schools and DistrictsLove Kesler Science

What Teachers Are Saying

Give Your Science Teachers Everything They Need

See It in Action

Texas Schools and Districts
Love Kesler Science