Chem 105 | Module 1 – 2026 Exam Review | 50+ Verified Q&A | Matter, Atomic Structure, Periodic Table

This document presents over 50 expert-verified questions and answers tailored for Chemistry 105 Module 1 (2026 academic year). It provides a concise, exam-focused overview of the foundational principles in general chemistry. Each question is followed by a clearly marked correct answer, designed to reinforce critical concepts and terminology necessary for early college-level chemistry courses. Topics covered include the definition and classification of matter, properties and types of substances (pure vs. mixtures), physical vs. chemical changes, subatomic particles, atomic structure, isotopes, and atomic weight. The document also details exact vs. inexact numbers, significant figures, and the structure and grouping of the periodic table—highlighting metals, nonmetals, metalloids, alkali metals, halogens, and noble gases. This study guide is ideal for: First-year university and college chemistry students Pre-med, biology, and health science majors requiring a chemistry foundation High school graduates preparing for introductory STEM programs Students preparing for Chem 105 quizzes, unit tests, or module assessments Its simplified layout and expert-verified accuracy make it a reliable companion for fast-paced review, foundational learning, and exam success in core chemistry concepts. Keywords: matter, pure substances, mixtures, elements, compounds, atoms, protons, neutrons, electrons, atomic number, atomic mass, isotopes, significant figures, metals, nonmetals, metalloids, periodic table, groups, periods, alkali metals, halogens, noble gases, chemical formula, chemistry basics, CHEM 105