Ionic Bonding
Overview
Table salt dissolves in water and conducts electricity when molten, yet it has a melting point above 800 degrees Celsius. These properties seem contradictory until you understand the bonding inside: oppositely charged ions locked together by powerful electrostatic forces in a giant lattice.
In this lesson you will learn how ions form by electron transfer, memorise the charges on common ions, write formulae for ionic compounds, draw dot-and-cross diagrams, and explain why ionic substances have high melting points yet conduct electricity only when molten or dissolved.
Objectives
- Understand how ions are formed by electron loss or gain
- Know the charges of common ions
- Write formulae for compounds formed between listed ions
- Draw dot-and-cross diagrams to show the formation of ionic compounds by electron transfer
- Understand ionic bonding in terms of electrostatic attractions
- Understand why compounds with giant ionic lattices have high melting and boiling points
- Know that ionic compounds do not conduct electricity when solid, but do conduct electricity when molten and in aqueous solution
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Ionic Bonding. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- What type of particle is formed when a sodium atom loses one electron? A) A negative ion B) A positive ion C) A molecule D) An isotope Answer: B
- What is the formula of calcium chloride? A) CaCl B) CaCl2 C) Ca2Cl D) Ca2Cl3 Answer: B
- Why do ionic compounds have high melting points? A) They contain molecules B) They have weak intermolecular forces C) Strong electrostatic forces act between oppositely charged ions in a giant lattice D) They are always solids Answer: C
- In which state can an ionic compound conduct electricity? A) Solid only B) Gas only C) Molten or in aqueous solution D) In any state Answer: C
- In a dot-and-cross diagram for MgO, how many electrons does magnesium transfer to oxygen? A) 1 B) 2 C) 3 D) 6 Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
Want to practice mock questions on Ionic Bonding? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
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