In the second experiment the student dissolved sucrose in water. They used some of the following
components to investigate if the resulting solution could conduct electricity.
Buzzer Wires
Battery
(s) Using electrical circuit symbols, draw a labelled diagram of a circuit the student could have
used to carry out this investigation. You may use the symbols on pages of the
Formulae and Tables booklet to help you answer this question.

Circuit Diagram

     + (Positive)
       |
       | 
   [Battery]
       |
       | 
      [Wire]
       |
      [Buzzer]
       |
      [Wire]
       |
    ┌──┴──┐
    │     │
[Electrode1]─
    │     │
    │  Sucrose 
[Electrode2]─
    │     │
    └──┬──┘
       |
      [Wire]
       |
     - (Negative)

Components Labelled:

1. Battery: Provides the electrical energy for the circuit.
   • Positive Terminal (+)
   • Negative Terminal (−)
2. Wires: Conduct electricity between components.
3. Buzzer: Acts as an indicator to show whether the circuit is complete (i.e., if electricity is flowing through the solution).
4. Electrodes (Electrode1 & Electrode2): Metal probes inserted into the sucrose solution. They allow the flow of electric current through the solution if it conducts electricity.
5. Sucrose Solution: The medium being tested for electrical conductivity. Although pure sucrose dissolved in water typically does not conduct electricity well, the presence of impurities or ions can facilitate conductivity.

How the Circuit Works:

• Closed Circuit for Conductivity: When the electrodes are immersed in the sucrose solution, if the solution conducts electricity (due to the presence of ions), the circuit is completed. This allows electric current to flow from the battery, through the wires, buzzer, and electrodes, causing the buzzer to sound.
• Open Circuit for Non-Conductivity: If the sucrose solution does not conduct electricity (i.e., it acts as an insulator), the circuit remains open, and the buzzer does not sound.

Notes:

• Electrode Material: It’s common to use inert metals like platinum or graphite for electrodes to prevent them from reacting with the solution.
• Completing the Circuit: Ensure that all connections are secure so that the circuit can properly complete when conductivity is present.
• Safety Precautions: Always handle electrical components with care, especially when working with solutions that may conduct electricity.