VCE Chemistry
Unit 2

Area of Study 3: Practical Investigation

Complete & Continue Next Lesson Learn More

IN THIS AoS3

Students complete a student-designed or student-adapted scientific investigation based on one or more key themes from Unit 2:

  • Acid–base reactions

  • Redox reactions

  • Production of gases

  • Analysis of substances in water

Students must design, conduct, and report an investigation that generates primary data.

  • You will be able to:

    • Design an experiment with clear variables and controls

    • Select appropriate equipment and measurement techniques

    • Collect accurate quantitative data.

    • Draw valid conclusions supported by chemistry principles.

    • Consider reliability, accuracy, precision, and sources of error.

    • Communicate findings clearly in a scientific report.

  • 1️⃣ What Is the Investigation About?

    Students choose a question related to:

    • Water chemistry

    • Gas-producing reactions

    • Acid–base behaviour

    • Redox processes or corrosion

    Your experiment must:

    • Include measurable data (mass, volume, pH, concentration, rate, etc.)

    • Be based on Unit 2 knowledge

    • Be safe and achievable in your school laboratory

    2️⃣ Scientific Method Breakdown (Simple Version)

    1. Aim

    What question are you trying to answer?

    2. Variables

    • Independent variable (changed)

    • Dependent variable (measured)

    • Controlled variables (kept constant)

    3. Hypothesis

    Predicted outcome based on chemistry theory.

    4. Method

    Step-by-step instructions to gather reliable data.

    5. Data Collection

    Tables, measurements, observations, gas volumes, pH readings, titration volumes, etc.

    6. Analysis

    Graphs, calculations, error discussion, links to theory.

    7. Conclusion

    What did your data show? Does it support your hypothesis?

    3️⃣ Suitable Investigation Themes

    Students often choose:

    🔵 Acid–Base Investigations

    🔴 Redox & Corrosion Investigations

    🟢 Gas-Generating Reactions

    🔍 Water Analysis Investigations

    4️⃣ Primary Data — What Students MUST Collect

    Your investigation must generate measurable data such as:

    • Volume of gas produced

    • Titration volumes

    • pH changes over time

    • Mass loss or gain

    • Voltage output of a simple cell

    • Colour intensity measured via calibration curve

    • Temperature changes

    5️⃣ Quality of Data

    Your teacher will look for:

    • Repeat trials

    • Averaged values

    • Appropriate graphs

    • Clear units

    • Correct significant figures

    • Proper handling of anomalies

  • Conceptual Questions

    1. What is the difference between accuracy and precision?

    2. Why are repeated trials important?

    3. Suggest a controlled variable for a corrosion experiment.

    4. Give one reason primary data is essential for this investigation.

    Calculation Questions

    1. Propose a hypothesis for:
      “How does acid concentration affect CO₂ production?”

    2. Identify IV, DV, and controlled variables for a galvanic cell voltage experiment.

    3. Suggest possible sources of error when measuring pH with a natural indicator.

    • Vague or unclear research question.

    • No clear link between data and chemistry theory.

    • Not identifying variables correctly.

    • Forgetting repeated trials.

    • Poor graph scaling or missing axis labels.

    • Keep your aim focused and specific

    • Plan your method step by step before starting

    • Collect enough data to show a clear pattern

    • Use tables, graphs, and units consistently

    • Link everything back to chemistry theory

    • Always check your conclusion matches your data

Book Free Trail
Download PDF