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Texas Science Teacher Resource Hub

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

Chris Kesler
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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    14 standards • Earth, Energy, Organisms & more
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All standards updated for the 2024 TEKS revision
TEKS Details | Texas Hub Module

6th Grade TEKS Standards

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

Matter & Properties (6.6)
6.6A Matter & Kinetic Energy 6.6B Pure Substances & Mixtures 6.6C Classify Elements 6.6D Comparing Density 6.6E Evidence of Chemical Changes
Force, Motion & Energy (6.7)
6.7A Forces in the Real-World 6.7B Calculating Net Force 6.7C Newton's Third Law of Motion
Energy (6.8)
6.8A Compare & Contrast Energies 6.8B Energy Transformations in Systems 6.8C Energy of Waves
Earth & Space (6.9)
6.9A Model Earth's Tilt & Seasons 6.9B Predicting Tides
Earth's Structure (6.10)
6.10A Differentiate Between Earth's Spheres 6.10B Modeling Layers of Earth 6.10C Processes in the Rock Cycle
Resources (6.11)
6.11A Resource Management 6.11B Managing Energy Resources
Ecosystems (6.12)
6.12A Biotic & Abiotic Competition 6.12B Ecological Relationships 6.12C Hierarchy of Ecosystems
Organisms (6.13)
6.13A Development of Cell Theory 6.13B Comparing Organisms 6.13C Variations & Survival
TEKS S.6.6B • Matter & Properties

Pure Substances & Mixtures

The Standard

"Compare and contrast the properties of pure substances and mixtures, including elements, compounds, homogeneous mixtures, and heterogeneous mixtures."

💡 What This Standard Actually Means

The Key Verb

"Compare and contrast". Students are finding similarities and differences across pure substances and mixtures. No complex chemical formulas. No calculating percentages by mass. The standard also uses the word "including", which signals where to focus your students: elements, compounds, homogeneous mixtures, and heterogeneous mixtures. Students should be able to identify and explain examples of each. Instruction can take many forms, such as Venn diagrams, T-charts, sorting activities, and labeled models.

A pure substance is made of only one kind of particle. An element, like copper or oxygen, is made of only one kind of atom. A compound, like water or table salt, is two or more elements chemically bonded together in a fixed ratio. Every water particle in a glass of water has the same two hydrogens and one oxygen, no matter how much water you have.

A mixture is two or more substances physically combined, where each keeps its own identity. In a homogeneous mixture, you can't see the separate parts. Salt water looks uniform throughout. In a heterogeneous mixture, you can see the different parts. A bowl of cereal and milk is a clear example. Mixtures can usually be separated using physical processes like filtering, evaporating, or using a magnet.

When students compare and contrast, the core distinction they should walk away with is this: pure substances have a fixed composition, and mixtures have a variable one. You can make salt water more or less salty. You cannot make water more or less watery.

💬 From Chris's Classroom

My go-to warm-up for this one was a tray of things from the kitchen: a bottle of water, a jar of salt, a chunk of aluminum foil, a cup of Italian dressing, a trail mix bag, and a can of soda. I'd have students sort them into two piles before I taught any vocabulary. Pure or mixed. They'd argue about soda. They'd argue about foil. Those arguments are where the real learning was. Then I'd introduce the four categories and we'd re-sort with the new labels. Kids remember the sorting fight longer than they remember any definition I ever gave.

⚠️ 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 looks uniform, it has to be a pure substance"

✓

This is one of the biggest traps. A glass of salt water looks completely uniform, but it's a mixture. A cup of milk looks uniform too. The real question isn't "does it look the same throughout," it's "is it made of only one kind of particle?" Homogeneous mixtures fool the eye on purpose.

×

"An element and a compound are basically the same thing"

✓

Students often treat any single-word substance as an element. Water is one word, so they call it an element. But water is a compound because it's hydrogen and oxygen chemically bonded. Elements are one type of atom. Compounds are two or more elements joined in a fixed ratio. Both are pure substances, but they're not the same thing.

×

"Mixing two substances always makes a new substance"

✓

When students stir sugar into water, they often say the sugar is "gone" or has turned into water. Sugar dissolving isn't a chemical change. The sugar particles spread out among the water particles, but they're still sugar. If you evaporate the water, the sugar crystals come back. Mixtures don't create new substances.

×

"Air is a pure substance because it's invisible"

✓

Students assume that because air looks like "nothing," it can't be complicated. Air is actually a homogeneous mixture of mostly nitrogen and oxygen, with smaller amounts of argon, carbon dioxide, and water vapor. You can't see the separate parts, but they're all in there together, and the proportions can shift.

📓 Teaching Resources for 6.6B

These resources are aligned to this standard.

Complete 5E Lesson
Pure Substances & Mixtures Complete Science Lesson
The full unit for 6.6B: 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
Preview → Buy →
Station Lab
Pure Substances & Mixtures Station Lab
9-station hands-on lab covering elements, compounds, and homogeneous and heterogeneous mixtures 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
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Student Choice Projects
Pure Substances & Mixtures Student Choice Projects
Choice board with nine project options plus a "design your own" pathway. Students demonstrate their understanding of pure substances, elements, compounds, and mixtures through writing, building, illustrating, presenting, or digital formats.
🎓 Best for: Project-based assessment • 2-3 class periods
Preview → Buy →

🌎 Phenomenon Ideas for 6.6B

Use these real-world phenomena to anchor your lesson. Show students the phenomenon first, let them wonder, then build toward Pure Substances & Mixtures as the explanation.

🔎
Phenomenon 1

Italian Dressing That Won't Stay Mixed

A bottle of Italian dressing sits on the shelf with clearly separated layers: oil on top, vinegar and herbs at the bottom. You shake it hard, and for a minute it looks mixed. Set it down, and within a few minutes the layers start separating again. Meanwhile, a cup of sweet tea next to it stays the same all the way down, no matter how long it sits.

💬 Discussion Prompt

"Both of these are mixtures, but they behave completely differently when you leave them alone. What's different about how the particles are arranged in the dressing versus the sweet tea?"

🔎
Phenomenon 2

Trail Mix vs. Chocolate Bar

A bag of trail mix and a plain chocolate bar are both packaged as one product. But with the trail mix, you can pick out almonds, raisins, M&Ms, and peanuts one by one. With the chocolate bar, no matter how small you break it, every piece looks and tastes the same. Each piece contains cocoa, sugar, and milk solids blended together so evenly you can't pick them apart.

💬 Discussion Prompt

"Both trail mix and chocolate are mixtures. Why is it so easy to pick out the pieces in trail mix but impossible to separate out the ingredients in a chocolate bar just by looking?"

🔎
Phenomenon 3

Salt Flats Left Behind After Water Evaporates

In West Texas and across parts of Utah, you can find huge white plains of salt stretching for miles. At one point, these were shallow lakes of salty water. When the water evaporated, the salt stayed behind. The salt didn't disappear when it was in the water, and the water didn't turn into salt. Both were still there the whole time, just not visible as separate things.

💬 Discussion Prompt

"If you can't see the salt in salt water, how do we know it's still there? Why does evaporating the water leave the salt behind, and what does that tell us about what kind of mixture salt water is?"

💡 Free Engagement Ideas for 6.6B

01

The Kitchen Sort

Set out 10 common items: sugar, salt, water, aluminum foil, copper penny, sweet tea, a chex mix bag, sand and water in a jar, oil and vinegar, and a soda. Give groups four labels: Element, Compound, Homogeneous Mixture, Heterogeneous Mixture. Have them sort, argue, and defend their choices before you reveal answers.

Materials: Collection of kitchen items, sort labels, paper plates or trays
02

Separate This Mixture

Give each group a cup with salt, pepper, iron filings, sand, and marbles mixed together. Give them tools: a magnet, a sieve, a coffee filter, and a cup of water. Challenge them to separate every component. They'll need to think through what makes each ingredient different, which is the heart of the standard.

Materials: Salt, pepper, iron filings, sand, marbles, magnet, sieve, coffee filter, cups
03

Evaporate the Salt Water

Have students dissolve 2 tablespoons of salt into 1 cup of warm water. Pour a thin layer into a black paper plate or shallow dish. Place it on a sunny windowsill. Over a few days, the water evaporates and the salt crystals reappear. Students document the process and explain why this proves salt water is a mixture, not a new compound.

Materials: Salt, warm water, measuring cup, shallow black dish or plate, sunny window
04

Build-a-Substance with Candy

Give each group different colored candies (Skittles, M&Ms, or Lego bricks work too). Have them model an element (all one color), a compound (two colors always bonded in the same ratio, like 2 red + 1 blue), a homogeneous mixture (colors evenly spread), and a heterogeneous mixture (colors clumped by type). Students draw and label each.

Materials: Colored candies or Lego bricks, paper plates, markers
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