Year 10 Science · Unit 2 · Lesson 1
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Learning Goals
Because… chain
Fill in the missing effects. Each cause leads to the next step in a chemical reaction.
Overall outcome:
Real-world context
In an experiment, a student places 50 g of fine iron wool into a sealed fireproof container along with 14 g of oxygen. The container is then heated until the iron completely reacts with the oxygen to form iron oxide (rust). The experiment is based on observations of infrastructure corrosion across Australia, iron bridges and building frameworks costing millions to maintain each year.
(a) Using the law of conservation of mass, predict the total mass of iron oxide formed in the sealed container. Show your working.
(b) If the container were left open to the air instead of sealed, the mass of iron oxide collected at the end would appear greater than the original 50 g of iron. Explain why this is consistent with conservation of mass, not a violation of it.
1. A word equation is written as: iron + oxygen → iron oxide. Identify the reactants and the product in this reaction.
2. Lavoisier (1789) is famous for establishing conservation of mass. Describe one type of experiment he might have done to demonstrate this principle, and explain what result he would expect.
Wrap Up
In one sentence, what was the main idea of this lesson?