Grade 9 Science students have now reached the end of an intensive, inquiry-based unit on acids and bases, exploring how we can use evidence to identify and explain acid–base behaviour. Students investigated indicators and pH, created their own red cabbage indicator, explored reactions between acids and metals, bases and carbonates, and designed investigations to examine variables such as concentration and pH. They also challenged common misconceptions around strong versus weak and concentrated versus dilute substances, using observations, particle explanations and conductivity evidence to develop more scientifically supported conclusions.
This week, students applied their learning to a real-world environmental issue through acid rain research and presentations. Working collaboratively, they investigated its causes, effects and possible solutions, using scientific evidence to explain how human activity can influence the environment. Next week, students will revisit and connect the key concepts from the unit as they prepare for their Criterion A summative assessment on 13 October. The focus will be on applying their understanding to unfamiliar situations, interpreting evidence and explaining acid–base phenomena scientifically, rather than simply recalling definitions.
