Active learning ideas
Quantitative Chemistry introduces the mathematical side of the subject, focusing on the conservation of mass and the mole concept. Students learn to calculate relative formula masses and use balanced equations to determine the amounts of reactants and products. This unit moves from qualitative observations to precise numerical analysis.
Activity 01
Groups perform a simple reaction (like vinegar and baking soda) in a sealed bag on a balance. They observe that the mass doesn't change, even when a gas is produced, proving the law of conservation.
How is the relative formula mass of a compound calculated?
Activity 02
Divide the class into 'experts' for different calculation types (e.g., mass to moles, moles to mass). These experts then rotate to teach their specific method to other groups using practice problems.
What is a mole in chemistry?
Activity 03
Provide students with unbalanced equations. They work in pairs to balance them using physical counters to represent atoms, ensuring the same number of each 'atom' is on both sides.
How can we use balanced equations to calculate reacting masses?
Templates
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A few notes on teaching this unit
Watch Out for These Misconceptions
Students often think mass is 'lost' if a gas is produced in an open container.
Explain that the mass has simply escaped into the air. Performing the reaction in a closed vs open system and comparing the results helps students understand that the atoms are still there, just not on the balance.
The 'mole' is often confused with a literal number of molecules rather than a unit of measurement.
Use the analogy of a 'dozen' to explain that a mole is just a specific number of particles. Physical sorting tasks with different 'units' of items can help make the concept of a molar quantity more relatable.
Methods used in this brief
Chemical Changes and Reactivity
Students investigate the reactivity series of metals and their reactions with acids and water. The topic includes the extraction of metals and redox reactions.
8 methodologies
Electrolysis
A study of how electricity is used to break down ionic compounds. Students will predict the products of electrolysis for molten and aqueous solutions.
8 methodologies