Development of Contextual Teaching Materials Based on the Project Based Learning model in the process of making Mg(OH)2 from seawater Geby Ayu Fadhilah (a*), Omay Sumarna (a), Sjaeful Anwar (a)
a) Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia,
Jl. Dr. Setia Budhi No. 229, Bandung 40154, Indonesia
*ayugeby[at]upi.edu
Abstract
Conventional learning which is one-way process and the insufficient availability of contextual teaching materials makes chemistry difficult for students. One of the contexts in society that can be used as material in chemistry learning is the manufacture of Mg(OH)2 from seawater. Seawater is sustainable and it is potential source to produce the compounds of Mg(OH)2 because the content of seawater Mg2+ is relatively high. Mg(OH)2 is a compound that plays an important role in human life, it can be used in various industrial fields, such as pharmaceutical field as the ingredients of material for making gastric medicine. That^s compounds used as antacids to neutralize stomach acid. This research aimed to produce contextual chemistry teaching materials in learning using a project-based learning model in the process of making Mg(OH)2 from seawater. The research used R & D (Research and Development) method with 4D teaching material development model that is modified into 3D (define, design, develop). The research instruments used a validated questionnaire and observation sheet. The results of the validation of teaching materials which include four aspects, they are- the feasibility of the material, content, language, and graphics show a CVI of 0.95. The valid categories are found in all of criteria such as content, language, and content aspects, on the other hand the invalid category are founded in one of the five criteria in the material aspect with a CVR value of 0.34, namely the content criteria for cognitive, psychomotor, and affective aspects of the material presented. It can be concluded that the application of teaching materials in learning can be done after correcting invalid criteria.
Keywords: Seawater, Mg(OH)2, contextual teaching materials, sustainability, project based learning
