Cohesion, adhesion and surface tension are the focus of this Grade 8 Science worksheet, which explores why water forms droplets on some surfaces, spreads across others, and moves through narrow spaces. Students connect the behaviour of water at surfaces to molecular attractions, capillary action in plants, and the observations scientists use to explain everyday phenomena.

The informational reading passage introduces cohesion as the attraction between water molecules and adhesion as the attraction between water molecules and other materials. It explains how these interactions contribute to surface tension and how cohesion and adhesion can work together to produce capillary action. Examples involving waxy leaves, clean glass, small insects on water, and water transport through plant tissues help students connect scientific vocabulary with observable evidence.

From Water Droplets to Scientific Explanations

This water properties worksheet goes beyond definitions by asking students to apply concepts to specific situations. They consider why water remains in rounded droplets on a waxy leaf, why it may spread on glass, and how surface tension helps explain the behaviour of small organisms on water. Students also examine how water moves through tiny gaps or tubes and why this process matters for plants.

Scientific investigation skills are woven into the topic. Students identify the factor being changed when comparing droplets on different surfaces, explain why changing one variable at a time makes a fair comparison more reliable, and distinguish evidence-based explanations from guesses. The activities also address misconceptions, including the inaccurate idea that surface tension forms a separate solid skin over liquid water.

Concepts and Activities Included

• An informational science passage introducing molecular attraction and water behaviour.
• Multiple-choice questions applying cohesion, adhesion, surface tension, and capillary action to real examples.
• True-or-false statements that reinforce accurate definitions and challenge common misconceptions.
• Short-answer responses explaining droplet cohesion, the combined roles of adhesion and cohesion in capillary action, and the molecular basis of surface tension.
• A labelled diagram activity, a categorisation task, and a short-note activity for visual interpretation and consolidation.

What Comes with the Worksheet

• Printable Grade 8 Science worksheet on water properties at surfaces.
• Separate PDF answer key for checking student responses.
• Student Notes lines at the bottom of the worksheet.
• Teacher Guide included in the answer key PDF, featuring Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes.

Useful for Matter and Water Lessons

Use this resource during a unit on matter, water properties, or scientific investigation. It can support guided reading, independent classwork, homework, or revision after students have been introduced to molecular attractions. The progression from familiar observations to explanations helps teachers assess whether students can distinguish cohesion from adhesion and explain how these properties relate to surface tension and capillary action.

The resource is labelled for Texas Science 8: Matter, Water and Reactions and identifies TEKS as its framework. Teachers can use the supplied Teacher Guide to prepare discussion prompts and anticipate misconceptions, while the separate answer key makes reviewing responses more straightforward. Check the specific expectations of your adopted TEKS curriculum when selecting it for standards-focused instruction.