Unit B- Matter and Chemical Change

Unit Overview

  • Unit Title: Matter and Chemical Change

  • Covers: Characteristics and classification of matter, observations of changes, theories of matter, periodic table, naming compounds, chemical reactions.

1. Introduction to Matter

  • Matter is described and organized through its physical and chemical properties.

  • Key Concepts:

    • Safety in the science lab: WHMIS guidelines.

    • Organizing and observing matter through its properties.

    • Changes in matter: physical vs chemical transformations.

2. Understanding the Nature of Matter

2.1 Evolving Theories of Matter

  • Historical development: from ancient philosophers to modern atomic theory.

  • Key figures include Democritus (atomos), Aristotle, Boyle, and Lavoisier (father of modern chemistry).

  • The periodic table organizes elements based on properties and atomic structure.

2.2 Organizing Elements

  • Elements can be classified as metals, nonmetals, and metalloids.

  • Understanding the periodic table's layout (groups/families and periods).

3. Compounds and Their Formation

3.1 Naming Compounds

  • Chemical names and formulas represent composition and structure.

  • Different systems for naming ionic and molecular compounds: IUPAC guidelines.

3.2 Ionic Compounds

  • Formed between metals and nonmetals, characterized by the transfer of electrons.

  • Properties include high melting points and conductivity when dissolved in water.

3.3 Molecular Compounds

  • Formed from nonmetals; can be solids, liquids, or gases.

  • Generally poor conductors and have lower melting/boiling points.

  • Naming follows a systematic approach using prefixes.

4. Chemical Reactions

4.1 Understanding Chemical Reactions

  • Definition: Reactants interact to form products, demonstrating conservation of mass.

  • Evidence of reactions includes changes in color, gas formation, and temperature changes.

4.2 Types of Chemical Reactions

  • Exothermic vs. Endothermic reactions based on heat exchange.

  • Common reactions: combustion, corrosion, cellular respiration.

4.3 Factors Affecting Reaction Rates

  • Four main factors: catalysts, concentration, temperature, and surface area.

5. Summary of Key Points

  • The periodic table categorizes and regulates elements, facilitating further chemical understanding.

  • Observing changes in matter and how they react is vital in identifying new substances.

  • Recognizing and applying safe laboratory practices ensures a secure learning environment.

  • Knowledge of chemical compounds and reactions is foundational for various applications in daily life and industry.