Elements and Compounds: Composition and Properties gives Grade 7 Science students focused practice with identifying pure substances through atomic composition, chemical formulas, and observable properties. The resource develops the distinction between elements and compounds while showing how bonding can produce properties that differ from those of the original elements.

Atomic Composition and Chemical Formulas

The reading passage establishes the foundation by comparing an element, made from one kind of atom, with a compound, formed when atoms of different elements bond together. Students work with examples including oxygen, iron, water, and sodium chloride while interpreting chemical symbols and formulas such as O, Fe, H2O, and NaCl.

Particular attention is given to subscripts and fixed atomic ratios. Students examine what the 2 in H2O communicates and connect chemical formulas with the composition of compounds. They also consider how bonding changes the way electrons are shared or transferred, helping explain why compounds can have macroscopic properties such as melting point and electrical conductivity that differ from their element parts.

Evidence-Based Classification Practice

Students apply these ideas through multiple-choice questions, true-or-false statements, short-answer responses, matching, a cloze passage, an extended response, and a Did You Know section. The tasks ask learners to classify substances from evidence, interpret formulas, explain fixed ratios, connect bonding with properties, and distinguish physical mixing from methods that break chemical bonds.

The extended response brings the concepts together by asking students to use atomic composition, bonding, and chemical formulas to determine whether a substance is an element or compound, supported by an example from the reading.

What Teachers Receive

• ✅ Student worksheet focused on elements, compounds, formulas, bonding, and properties
• ✅ Separate PDF answer key for efficient checking and review
• ✅ Student Notes & Lesson Summary supplement for reinforcement
• ✅ Separate Teacher Guide with Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes

Use Across the Pure Substances and Mixtures Unit

Use this Grade 7 Science worksheet when introducing elements and compounds, reinforcing chemical formula interpretation, checking classification skills, or reviewing the composition of pure substances. The combination of reading, selected-response practice, concise written explanations, and extended reasoning gives teachers several ways to check whether students can move from vocabulary recognition to evidence-based classification.

Designed for the Ontario Pure Substances and Mixtures topic, this resource keeps the focus on the relationship between atomic composition, chemical bonding, formulas, and the properties of substances.