At TutorASAP we help you prepare Internal Assessments for IB subjects such as Chemistry, Biology and Physics
The International Baccalaureate (IB) is known for its academic rigor and its focus on practical learning. Within science subjects (Chemistry, Biology, and Physics), students must carry out an Internal Assessment (IA) with great precision, combining experimental design, data collection, statistical analysis, and interpretation of results. In this way, students not only consolidate knowledge, but also develop critical skills for university.
At TutorASAP, we guide our students throughout the entire IA process, supporting them in formulating hypotheses, managing data, and creating professional-quality graphs. In addition, our IB-specialized tutors work with them to meet the official assessment criteria of the program, ensuring that their projects are not only original but also solid and well-grounded.
In Chemistry, one of the most common IA topics is kinetics. For example, a student might investigate “The effect of hydrogen peroxide concentration on the rate of decomposition catalyzed by manganese dioxide”.
This project would involve measuring the volume of oxygen released every 30 seconds for different concentrations. The data would be plotted in a volume vs. time graph, showing steeper slopes at higher concentrations. The analysis would include calculating initial rates and applying the rate law.
The IA stands out for a clear experimental design and correct data processing. The inclusion of multiple trials increases reliability. A suggested improvement would be to apply a more detailed systematic error analysis (e.g., syringe precision in gas collection).
In Biology, a classic topic is plant physiology. An example IA could be “The impact of different light intensities on the rate of photosynthesis measured by oxygen bubble production in Elodea canadensis”.
Students should record the number of bubbles per minute under varying light intensities (measured in lux). Results would be displayed in a scatter plot with a trend line, showing an initial positive relationship that later levels off (plateau) at high intensities.
The analysis is strong in identifying the relationship between light intensity and photosynthetic rate. The discussion of the “limiting factor” concept is highly valued. As a recommendation, control of external variables (such as water temperature) could be improved.
In Physics, IAs often focus on experimentally measurable physical laws. An example is “The relationship between the angle of incidence and the angle of refraction through plexiglass, compared to glass”.
Students should measure angles with a goniometer and plot sin(i) vs. sin(r) on a linear graph, confirming the validity of Snell’s Law. The slope would allow calculation of the experimental refractive index for each material.
The IA demonstrates proper use of quantitative data and rigorous mathematical analysis. The percentage error compared to reference values would be critically discussed. An improvement could be extending the range of angles to reduce measurement bias.
Science IAs in the IB represent a unique opportunity for students to develop genuine scientific research skills. At TutorASAP, we support our students so that their projects not only meet academic criteria but also reflect their curiosity and analytical ability. With clear examples, well-prepared graphs, and a critical approach, each student can stand out on their path to success in the International Baccalaureate.
