Physical and chemical changes in matter are the focus of this Grade 7 Science worksheet, where students use observable evidence to decide whether a substance has changed its form or become a different substance. Rather than relying on whether a change can be reversed, learners examine properties, interpret observations and explain how evidence supports a scientific classification.

Investigate the evidence behind matter changes

The reading passage contrasts physical changes, such as melting ice, freezing water and crushing chalk, with chemical changes that produce substances with different properties. Students explore how a physical change can affect a material's state, shape, size or arrangement while the substance remains the same.

For chemical changes, the resource introduces observable clues including gas formation, the appearance of a new solid, a lasting colour change, temperature change and light production. Examples such as vinegar reacting with baking soda and iron forming rust help students connect these clues to possible new substances. An important concept throughout the worksheet is that reversibility alone does not reliably distinguish physical from chemical changes. Breaking glass may be difficult to reverse without producing a new substance, so students must consider evidence about the material and its properties.

Practise classifying changes with evidence

Students apply the concepts through multiple-choice questions, truth-assessment statements, short-answer responses, a matching activity and a reading-and-filling cloze passage. These tasks ask learners to classify familiar examples, recognise evidence of chemical reactions, explain why freezing water is a physical change and justify why broken chalk remains the same substance.

The extended-response task presents a mixture that produces bubbles, a lasting colour change and a temperature change. Students explain how these observations support a possible chemical-change classification and why reversibility should not be the deciding rule. The Did You Know feature provides an additional topic-related point of interest.

Resources included for students and teachers

• Printable Grade 7 Science worksheet for physical and chemical changes in matter.
• Separate PDF answer key for checking student responses and reviewing classifications.
• Student Notes & Lesson Summary supplement for revisiting the main concepts and vocabulary.
• Separate Teacher Guide with Learning Objectives, Teaching Tips, Discussion Questions and Common Mistakes.

Classroom use and learning support

Use this physical versus chemical changes practice during a unit on elements, compounds and solutions, for independent classwork, homework, lesson review or assessment preparation. Students can also use the questions to discuss observations from demonstrations or investigations, record evidence carefully and support conclusions with specific details rather than assumptions.

For Grade 7 TEKS Science teaching, the worksheet provides a focused way to strengthen scientific reasoning about matter. The separate answer key supports checking, the notes supplement helps students review, and the teacher guide offers practical preparation and discussion support. Together, these components give learners repeated opportunities to distinguish a change in form from the formation of a new substance and to explain their decisions using evidence.