Lesson on Balancing Chemical Equation

Subject / Topic:	Chemistry / Balancing Equation
Type of lesson:	Conceptual / Application
Prior Knowledge	Chemical formula
Lesson Objective	Students will apply the law of conservation of mass to understand the concept of balancing chemical equations.

Duration (Total 65 mins)	Brief outline of activity	Remarks / Resources
10 mins	Activate Learning: Online quiz as a formative assessment to chemical formulae   Students will understand that the chemical formula of a substance describes its composition.	Kahoot
25 mins Engagement	Introduction on Law of Conservation of Mass   -        Student to draw the product when wood is burnt and when a plant undergo photosynthesis. -        Wood + Fire à CO2 + H2O vapour + ash -        CO2 + plant + sunlight à glucose + oxygen   -        Using a brief PowerPoint, show how chemical reactions obey the law of conservation of mass.   -        Illustrate the use of coefficients to balance a chemical equation. And help students to differentiate coefficient from subscript.   -        show how counting atoms on both the reactant side of the equation and the product side of the equation will illustrate the law of conservation of mass.   Terminology to introduce: ‘ Reactants’ ‘Products’ ‘Subscript’ ‘Coefficient’	Video Law of Conservation (Mass)   Worksheet Page 1   PPT
15 mins Exploration / Explanation	Hands on activity to provide a visual representation of balancing equation by students individually.   Students are given 3 types of beans of different colour. Each bean will represent one element. Students will arrange the beans, so they form the chemical formula of the reactants.   Students will then use the beans in the ‘reactant’ box and form the products.   This activity aims to help students understanding of law of mass conservation by rearranging the same set of beans before and after the BALANCED reaction.	Beans +   Worksheet Page 2
15 mins Evaluation	Success Criteria to gauge if the lesson objective has been made Exit pass: Thumbs Up /  Class work / Assignment	Balance equation worksheet

PPT Slide - Balancing Chemical Equation