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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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All standards updated for the 2024 TEKS revision

TEKS Details | Texas Hub Module

7th Grade TEKS Standards

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TEKS S.7.6A • Matter & Properties

Compare Elements & Compounds

The Standard

"Compare the properties of elements and compounds, including the arrangement of atoms in each."

💡 What This Standard Actually Means

The Key Verb

"Compare". Students are finding similarities and differences between elements and compounds. No complex calculations. No memorizing the entire periodic table. The standard also uses the word "including", which signals where to focus your students: the arrangement of atoms in each. Students should be able to identify and explain that elements are made of one type of atom while compounds are made of two or more different types of atoms chemically bonded together. Instruction can take many forms, such as Venn diagrams, T-charts, labeled particle models, and sorting activities.

An element is a pure substance made of only one kind of atom. Oxygen, iron, carbon, and gold are each elements. You find them on the periodic table, each with its own chemical symbol. Elements cannot be broken down into simpler substances by chemical means.

A compound is a pure substance made of two or more different elements that are chemically bonded in a fixed ratio. Water (H₂O), carbon dioxide (CO₂), and table salt (NaCl) are compounds. Compounds can be broken down into their elements through chemical reactions, and the properties of a compound are often very different from the properties of the elements that form it.

When students compare the two, the arrangement of atoms is the biggest idea. Elements have particles that are all the same type. Compounds have particles made of two or more different types of atoms locked together in a repeating pattern. Symbols are used to name elements (H, O, Na), while formulas are used to name compounds (H₂O, NaCl). Both are pure substances, which separates them from mixtures.

💬 From Chris's Classroom

The move I leaned on for this was a quick sort with index cards. I'd write single-atom drawings on some cards (like two oxygen atoms stuck together for O₂) and compound drawings on others (like H₂O with two hydrogens and one oxygen). Kids sorted them into two piles before I ever said the words "element" and "compound." Once they had piles, I'd ask, "What's different about each pile?" They'd usually land on "same kind of atom vs. different kinds." That's your definition, and the kids just built it themselves. From there, layer in the vocabulary and the symbols vs. formulas piece.

⚠️ 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 it's made of more than one atom, it's a compound"

✓

Oxygen gas (O₂) is two oxygen atoms bonded together, but it's still an element because both atoms are the same type. A compound requires two or more DIFFERENT elements. The rule is about the types of atoms, not the number of atoms.

"A compound is just a mixture of elements"

✓

Mixtures can be separated by physical means and the parts keep their original properties. Compounds are chemically bonded in fixed ratios, and their properties are usually very different from the elements that formed them. Hydrogen burns, oxygen supports burning, but together they form water, which puts out fire.

"Compounds have the same properties as the elements inside them"

✓

Sodium is a soft metal that reacts violently with water. Chlorine is a toxic yellow-green gas. Bond them together and you get sodium chloride, which is table salt, safe to sprinkle on dinner. Compound properties are usually very different from the properties of the elements that make them up.

"Every symbol on the periodic table is a compound"

✓

The periodic table lists elements only. Each square represents one type of atom. Compounds are not on the periodic table. They're written as chemical formulas built from element symbols, like H₂O or CO₂.

📓 Teaching Resources for 7.6A

These resources are aligned to this standard.

Complete 5E Lesson

Compare Elements & Compounds Complete Science Lesson

The full unit for 7.6A: 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

Compare Elements & Compounds Station Lab

9-station hands-on lab covering elements and compounds 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

Compare Elements & Compounds Student Choice Projects

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

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

🌎 Phenomenon Ideas for 7.6A

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

🔎

Phenomenon 1

Salt on the Kitchen Table

Sodium is a silvery metal so reactive that it can ignite when it touches water. Chlorine is a yellow-green gas that was used as a chemical weapon in World War I. Yet when sodium and chlorine bond together, the result is sodium chloride, the white crystal we sprinkle on french fries. How does combining two substances that are each dangerous on their own produce something safe to eat?

💬 Discussion Prompt

"Why would a compound have such different properties from the elements that form it? What does that tell us about the difference between an element and a compound?"

🔎

Phenomenon 2

Water: Fire Starter or Fire Stopper?

Hydrogen gas is extremely flammable. Oxygen gas is what fire needs to burn. Logically, combining them should create an enormous fireball. Instead, when hydrogen and oxygen bond in the right ratio, they form water, which firefighters use to put fires out. Same atoms, but the arrangement changes everything.

💬 Discussion Prompt

"Hydrogen and oxygen are elements. Water is a compound made of those same two elements. Why does the compound behave so differently from the elements that built it?"

🔎

Phenomenon 3

Diamond and Pencil Lead

A diamond is one of the hardest natural substances on Earth. The "lead" in a pencil is soft enough that rubbing it on paper leaves a mark. Both are made of exactly the same element: carbon. The only difference is how the carbon atoms are arranged. Same single element, two very different materials.

💬 Discussion Prompt

"If both diamond and graphite are made of only carbon atoms, what can we learn about elements from looking at them? What does this tell us about why the arrangement of atoms matters?"

💡 Free Engagement Ideas for 7.6A

LEGO or Bead Particle Models

Hand out LEGO bricks or colored beads. Tell students each color represents a different element. Have them build an element (all one color), a diatomic element like O₂ (two bricks of the same color), and a compound like H₂O (two of one color bonded to one of another). Have them trade models with a partner and identify each.

Materials: LEGO bricks or colored pony beads, pipe cleaners or string (for beads)

Element vs. Compound Sort

Prepare cards with chemical symbols and formulas (H, O₂, Au, NaCl, H₂O, Fe, CO₂, Cu, CH₄, N₂). Have students sort them into "Element" and "Compound" piles and justify each placement. Include O₂ and N₂ to catch the "more than one atom = compound" misconception.

Materials: Index cards or printed sort cards, optional: table labels for sorting

Kitchen Cabinet Element Hunt

Ask students to bring in labels or photos from food and cleaning products at home. In class, have them circle ingredients that are elements (iron, zinc, calcium, copper) and ingredients that are compounds (sodium chloride, sodium bicarbonate, carbon dioxide). Discuss how compounds show up on labels versus how elements do.

Materials: Food/cleaning labels from home, highlighters or colored pencils

Build a Periodic Table Mini-Poster

Assign each student two or three elements from the periodic table. They create a mini-poster showing the symbol, the atomic number, and one compound that element forms (for example, sodium + chlorine forms NaCl). Arrange them together on a classroom wall to build a student-made periodic table with compound connections.

Materials: Construction paper or index cards, markers, tape

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Texas Science Teacher Resource Hub

🚀 Jump to Your Grade

7th Grade TEKS Standards

Compare Elements & Compounds

💡 What This Standard Actually Means

⚠️ Misconceptions Your Students May Have

📓 Teaching Resources for 7.6A

🌎 Phenomenon Ideas for 7.6A

Salt on the Kitchen Table

Water: Fire Starter or Fire Stopper?

Diamond and Pencil Lead

💡 Free Engagement Ideas for 7.6A

LEGO or Bead Particle Models

Element vs. Compound Sort

Kitchen Cabinet Element Hunt

Build a Periodic Table Mini-Poster

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