Chemical Bonding
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About this topic
This foundational Form 2 topic introduces the concept of chemical bonding as per the Zambian Competence-Based Curriculum. You will learn why and how atoms combine to form molecules or compounds, analysing the main types of bonds: ionic, covalent, and metallic. Understanding bonding is crucial for explaining the properties of substances you encounter daily. Through CBC activities, you will develop the ability to relate bonding type to physical properties, a skill frequently assessed in ECZ examinations. This topic directly prepares you for writing chemical formulae, naming compounds, and understanding more complex reactions, forming a core part of your revision for School Based Assessments and the final Form 4 exam.
What you'll practise (6 questions)
- The following dot and cross structure represents a molecule made of three different elements L, M and N, showing the outermost shell electrons only. Which set represents the correct identities of L, M and N?
- If atoms of element A and element B combined to form a compound, what type of bonding would be involved?
- Which pair of elements can combine chemically to form single covalent bonds?
- Draw the dot and cross structures showing outer shells only for 2N and N₂.
- Compare the electrical conductivity of liquid carbon tetrachloride and liquid potassium chloride.
- Which of the two compounds (CCl₄ and KCl) has a higher melting point? Explain your answer.
Answer each question above to see the correct answer and a full explanation.