PlanningBackground: Provide a context for the investigationWrite an aim – How does changing _____ affect the _________of ______Create a hypothesis/ prediction supported by science

Variables Factor DescriptionIndependent Temperature Temperature will be changed by heating with a Bunsen

burner and measurements will be made every 10 degrees as measured by a thermometer

Dependent Conductivity Measured using a LabPro conductivity probe

Fixed

Method• A labelled diagram should be used to support

method • Numbered single instruction sentences• Must include how to alter the IV, how to measure

the DV and how to control other variables• Highlight any safety precautions made in a

separate boxExample1. Set up equipment as shown in the diagram.2. Use a measuring cylinder to collect 20ml of hydrochloric acid.

Data CollectionIndependent Variable ± uncertainty (units)

Dependent Variable ± uncertainty (units)

Trial 1 Trial 2 Trial 3 Average

Volume of acid (ml)

Conductivity (μS/cm)

Trial 1 Trial 2 Trial 3 Average

10

20

30

40

50

General example

Example

Qualitative notes including any anomalies should be recorded after the results tableInclude uncertainty when approaching DP

Remember you target is 5 sets of data each repeated 3 times

Data Analysis•Construct a scatter graph with a trend line – the independent variable should always be on the x-axis

•Describe the graph trend in words and with a mathematical formula. E.g. A straight line of best fit with a positive gradient (y = 84x-2)

Data Analysis (Ready for DP)•Data points should include uncertainty•A straight line graph must also contain maximum and minimum to form a range for the gradient

Conclusion• Make a conclusive statement – what

did you find out • Offer a scientific explanation

Comment on the validity of your findings1. Was the data close to your trend line?2. Did all the data points follow the trend?3. Comment on the size of the max/min range

Validity of Hypothesis

Evaluate the hypothesis against the conclusive statement

• This means more than my conclusion agrees with my hypothesis but an evaluation of how well they agree (or NOT)

EvaluationImprovements

ExtensionsDescribe extensions to the method which would benefit scientific investigation e.g. collect data over a wider range

Issue Impact ImprovementExample: Volume not controlled

Evaluate the impact on all results

Example: Measure 100ml with measuring cylinder