Comparing Mixtures & Solutions Lesson Plan (TEKS 4.6B): A Complete 5E Lesson for Investigating Mixtures and Solutions

Inside the Comparing Mixtures & Solutions 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 Comparing Mixtures & Solutions 5E Lesson is built on this framework from start to finish. Here's how it plays out across the five phases.

🎯 Engage

Day one is a teacher-led demo and student investigation. Each small group gets two clear cups of warm water, a packet of sugar, and a small spoonful of sand. Following the step-by-step teacher directions, they predict what each substance will do, stir both cups, and observe what happens over five minutes.

By the end of the period, kids have a sketch of both cups in their student sheet, drawn in their own hand, and they can explain why one looks clear and one looks cloudy. Nobody has heard the formal vocabulary yet. That's the point. They're walking into the rest of the unit with a working mental model of "dissolving," not a memorized definition.

What's included in the Engage:

• Teacher directions for the sugar-and-sand investigation
• Printable student observation sheet
• Answer key for the discussion questions
• Four learning objective slides (standard verbatim, "I CAN...", "WE WILL...", and essential question)
• An illustrated Matter Word Wall in English and Spanish covering the full unit vocabulary

🔬 Explore

The Comparing Mixtures & Solutions 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 on mixtures vs. solutions and answer guided questions.
• 📖 Read It! — A one-page reading passage at two differentiated levels, with a Spanish version included.
• 🔬 Explore It! — A hands-on dissolving station where students mix salt, sugar, sand, and oil with water and classify each result as a mixture or a solution.
• 💻 Research It! — Reference cards comparing mixtures and solutions with everyday examples and visual diagrams.

The four output stations:

• 📋 Organize It! — A card sort where students physically place examples (trail mix, sweet tea, vinegar water, sand and water) under the correct category.
• 🎨 Illustrate It! — Students draw a side-by-side comparison of a mixture and a solution with examples and labels.
• ✍️ Write It! — Three open-ended questions in complete sentences where kids defend their classification choices.
• 📝 Assess It! — A short formative check with multiple choice and a fill-in-the-blank vocabulary paragraph.

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 Comparing Mixtures & Solutions 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

Here's the real payoff of doing the Engage and Explore before the Explain: by the time kids hit this phase, they've already stirred sugar, sand, oil, and salt into water with their own hands. They have a working understanding before you ever start naming things. The discussions get deeper, the questions get sharper, and you spend less time defining and more time pushing their thinking.

The Comparing Mixtures & Solutions Presentation walks 4th graders through the full scope of TEKS 4.6B, one concept at a time. The deck opens with a quick reset on matter and substances (a substance is a single kind of matter like aluminum foil or salt) and then builds out the mixture framework: a mixture is two or more substances combined where the substances keep their own properties and can be easily identified. From there the deck moves into the special case: solutions.

Students learn that a mixture can be made from solids, liquids, or any combination: solid plus solid (trail mix), solid plus liquid (sand and water), and liquid plus liquid (oil and water). The key idea is that in a mixture, the parts stay themselves. You can pick the raisins out of trail mix. You can wait for the sand to settle and pour the water off. The substances are physically combined, not chemically joined.

Then the lesson zooms in on solutions as a special kind of mixture. In a solution, one substance dissolves into another so the parts spread out evenly and you can no longer see them. The lesson covers the two types the TEKS specifies: solids dissolved in liquids (sugar in water, salt in water) and liquids dissolved in liquids (vinegar in water). Real-world examples bring it home. Sweet tea, lemonade, coffee, hot chocolate, and hand sanitizer are all solutions. Kids start spotting solutions everywhere in their kitchen once they have the vocabulary.

What makes the Comparing Mixtures & Solutions Presentation different from a typical physical science slideshow is that kids are doing something on almost every single slide. It's not a lecture deck. It's a participation deck. "Your answer:" prompts appear on most slides, Brain Breaks reset attention every few slides, Quick Action INB tasks (a substance-or-mixture sort, a Venn diagram drag-and-drop comparing mixtures and solutions, a "This or That" code-cracking activity) show up throughout, and Think About It prompts push deeper into bigger ideas like why some liquids mix evenly and others form layers. The deck closes with a Check for Understanding tied back to the Essential Questions: Compare the physical properties of a mixture and a solution. If you were given an unknown mixture, how could you determine if it were a mixture or solution?

The Explain materials in this product include:

• An editable 23-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 built-in Think About It prompts are where the real discussion happens, so let those breathe.

🛠️ Elaborate

The Elaborate phase is where students stretch what they learned about comparing mixtures and solutions and put it into a project of their choosing. In this 4th grade physical science lesson, that's a Student Choice Project board with six different project options plus a "design your own" pathway.

Students might create a "mixture or solution" cookbook with five recipes labeled and explained, design a kitchen advertisement that markets a homemade solution (lemonade, sweet tea) using accurate vocabulary, or build a poster showing five mixtures and five solutions with sketches and explanations. 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 mixtures and solutions 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 4.6B and you actually get to see what they understand about how substances combine.

The rubric (the part teachers actually want)

Every project, no matter which option a student picks, is graded on the same 100-point rubric. Five categories at 20 points each:

• Vocabulary (20 pts) — At least four words from the lesson are used in context.
• Concepts (20 pts) — At least two key concepts from the lesson are referenced.
• Presentation (20 pts) — The project grabs attention and is well-organized.
• Clarity (20 pts) — Easy to understand. Free of typos.
• Accuracy (20 pts) — Drawings and models are accurate. The science is right.

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 of mixtures and solutions. 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 an image of a cup of liquid (or a kitchen scenario) and ask them to classify it as a mixture or solution and explain why.

The full assessment has 12 questions across five formats:

• Multiple choice (4 questions) covering vocabulary, examples of mixtures and solutions, and methods of separating mixtures
• Hotspot / visual (2 questions) where students circle the image that shows a solution and describe how it's different from a regular mixture
• Multiselect (2 questions) where students pick all examples that count as solutions from a list
• Short answer (2 questions) on how you can tell if an unknown mixture is a solution
• Multipart scenario (2 questions) with a kitchen investigation where kids identify which cups are mixtures, which are solutions, and explain their reasoning

A modified version is included for students who need additional support. 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.