MODULE 2

• City of Good Character
• Jordan B. Plopino, Department of Education, National Capital Region, SCHOOLS DIVISION OFFICE, MARIKINA CITY
• Science, Quarter 2 -Module 2, Properties of Ionic and Covalent Compounds
• Ionic compounds


  Compounds formed by the complete transfer of electrons between a metal and a non-metal
• Covalent compounds


  Compounds formed by the sharing of electrons between two non-metals
• Lessons in the module

  • Lesson 1 - Naming of Ionic and Covalent Compounds
  • Lesson 2 - Physical Properties of Ionic and Covalent Compounds
  • Lesson 3 - Application of the Properties of Ionic and Covalent Compounds in Natural Phenomena
• After going through this module, you are expected to recognize different types of compounds (ionic or covalent) based on their properties such as melting point, hardness, polarity, and electrical and thermal conductivity
• Specific learning objectives


  • Identify and describe ionic and covalent compounds based on their chemical formula and chemical names
  • Enumerate and discuss different physical properties of ionic and covalent compounds
  • Distinguish ionic from covalent compounds based on their physical properties
  • Cite natural phenomena that uses different physical properties of ionic and covalent compounds (ex. Snowflakes, voltaic cells)
• Covalent bond


  Formed by the sharing of electrons between two non-metals
• Ionic bond


  Formed by the complete transfer of electrons from a metal to a non-metal
• Cation


  Positively charged ion formed when a metal loses electron(s)
• Anion


  Negatively charged ion formed when a non-metal gains electron(s)
• Formula unit


  The representative unit of an ionic compound
• Polar covalent bond


  Covalent bond with unequal sharing of electrons
• Non-polar covalent bond


  Covalent bond with equal sharing of electrons
• Activity 1.1: Is It Ionic or Covalent?


  1. Write the correct name of compounds based on their chemical formula

  2. Identify the ionic and covalent compounds
• Activity 1.2: It's a-MAZE-ing Ionic and Covalent Journey


  Trace the maze guided by the concepts learned in the lesson on ionic and covalent compounds
• Let's Write A Single Paragraph!
• Most common elements in nature need to bond with other elements and form compounds
• Ionic bonding


  Involves non-metal and a metal, wherein there is a complete transfer of electron(s)
• Covalent bonding


  Involves non-metal and non-metal, wherein electron(s) is(are) shared
• Equal sharing of electrons

  Non-polar covalent bond
• Unequal sharing of electrons

  Polar covalent bond
• Compounds formed by covalent bonding

  Molecules
• Ionic compounds generally exist in a solid form and can be characterized with crystalline (crystals) form
• Ionic compounds have very high melting and boiling points as compared to covalent compounds
• Ionic compounds are good conductors of electricity because they form ions, most especially when dissolved in water
• Covalent compounds, normally, do not conduct electricity and are generally referred to as poor conductors
• Ionic compound

  Sodium chloride (NaCl) - table salt
• Covalent compound


  Candle wax (C25H52)
• Ionic and covalent compounds both form bonds between atoms
• Ionic compounds usually form crystals or are in solid form at room temperature
• Covalent compounds have low boiling and melting points
• Covalent compounds can exist in solid, liquid, or gas
• Ionic compounds are formed between a metal and non-metal elements
• Ionic compounds easily dissolve in water and become good conductors of electricity
• Water cycle involves the presence of water molecules, a polar covalent compound
• Photosynthesis involves carbon dioxide and water, both covalent compounds
• Natural process involved

  Evaporation
• Classification of compound

  Ionic