I decided to use the “reaction rate experiment” as an example of Learning Object.
http://risal.cite.hku.hk/link.php?id=3788&randkey=9043288
This example is about how the size of the CaCO3 is affecting the reaction rate when dissolved in acidic environment. The learning objective of this experiment is to investigate how the particle size would affect the rate of reaction. It provides the opportunity for the students to see the difference in particles movement in the flask when they put in fine, medium and large granules of CaCO3. The difference in reaction rate is also shown in the graphs.
Using learning object to represent these kind of experiments is useful because the Science teacher can ask the students to go over this visual experiment at home as pre-laboratory or pre-lecture work together with some questions for students to answer. Such preparation work allows the students to think about why the rate of reaction is faster when smaller particles are put in the reaction, what’s the actual reaction taken place – acid + alkaline reaction, what’s the actual gas formed as final product. It also allows students to investigate this scientific phenomenon in their own pace, without worrying about not being able to finish the experiment. Moreover, students may find the simulated experiment by learning object appealing and engaging, they may therefore be more involved and motivated when participating in the actual laboratory session as a consequence. This enhances the student engagement in practical session and may promote deep learning in students. It may not be necessary for the students to carry out the same experiments in the practical session, because that has been covered in the e-learning environment. Instead, the teacher can design the experiment based on the same format but use a different combination of chemicals, which can be used as assessment. It’s good to have these learning objects as open source, as teachers can just find them on the web and share their work.
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