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An open, spiral-bound notebook, rotated 90 degrees clockwise, rests on a light-colored surface, likely a desk. The notebook has a light blue plastic binder cover on the left. The pages are filled with handwritten notes, diagrams, and chemical equations, primarily in black ink. Part of a white and brown fabric, possibly clothing or bedding, is visible in the blurred background. The visible notes are in Indonesian and pertain to chemistry, specifically "Elektrolit Dan Non Elektrolit" (Electrolytes and Non-Electrolytes). Definitions explain that electrolytes are solutions that can conduct electric current through chemical reactions (ionization). Examples of acids, bases, and salts are given with their ionization reactions, such as "AL(OH)3 → AL+3 + 3OH-" and "(NH4)2(SO4) → 2NH4+ + SO4-2". A note mentions that compound coefficients remain constant, but electrons are exchanged. An "Eksperimen" (Experiment) section details observations related to the strength of electrolytes, including "Nyala lampu/cahaya" (light bulb/light) and "Gelembung Gas" (gas bubbles), with categories like "Flek. Kuat" (strong spot), "Flek. Lemah" (weak spot), and "non Elek." (non-electrolyte), described by terms such as "terang" (bright), "redup" (dim), "padam" (off), "banyak" (many), "sedikit" (few), and "Hampir tidak ada" (almost none). The term "Larutan Buffer → Penyangga" (Buffer Solution → Buffer) and "pH" are also visible. The left page contains complex chemical equations, likely redox reactions, with coefficients and oxidation states indicated (e.g., "+4", "0", "-5", "-1"). The brand name "DIS BOSS" and "6 mm" are visible on the bottom right page.
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