Mix sample with ethanol, then add water. Positive result: Cloudy white emulsion. 📉 Core Skill 3: Data Presentation and Analysis
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Increase replication to at least five trials per independent variable level to calculate a reliable mean and remove anomalies.
Determining the water potential of plant tissues (like potato cylinders or onion epidermal strips) is a standard syllabus requirement. Method 1: Change in Mass or Length biology 9700 practical notes
Evaporation altered concentrations during the experiment.
To improve accuracy, use better instruments. To improve precision, control all variables carefully. To improve reliability, take repeat readings and calculate the mean.
The margin of error is typically half of the smallest graduation on the instrument. Example: A thermometer graduated every 1∘C1 raised to the composed with power C has an uncertainty of Mix sample with ethanol, then add water
Every piece of manual apparatus has an inherent margin of error. The systematic uncertainty is typically half of the smallest graduation on the instrument. For example: A thermometer graduated in 1∘C1 raised to the composed with power C steps has an uncertainty of
State a minimum of 5 distinct concentrations/values for your IV. Detail exactly how you will prepare them using standard lab equipment (e.g., simple or serial dilution).
You must know the reagents and the specific color changes for biological molecules. 🍱 The Big Four Tests This link or copies made by others cannot be deleted
Hydrolyze the sample first by adding dilute hydrochloric acid, boiling, and then neutralizing with sodium hydrogencarbonate before adding Benedict's.
Use a sharp pencil; dots should be small and encased in a small circle or cross.
Ensure you have enough time to finish the data analysis and graph section.
Respirometers track the rate of aerobic respiration by measuring oxygen consumption over time in small organisms or germinating seeds. Potassium hydroxide (