The beach is an attractive place to unwind from your daily routine. The beauty of the beach must always be maintained so that comfort can still be obtained for everyone who visits it. The beach becomes a comfortable place if cleanliness is maintained. Plastic waste, if any along the coast, can be carried by the waves into the ocean. Plastic waste brought to sea can be consumed by marine biota because marine biota cannot distinguish between plastic and food waste. This community service activity intends to inspire visitors (tourists), managers and traders at Balekambang beach to care about the environment. A well-preserved environment will be a legacy that will be left on the next generation. The survey results show that visitors understand the meaning of waste and are willing to dispose of waste in its place.

<pre><strong>Abstract:</strong> This study aims to describe acid-base misconceptions across levels of education using multiple representation based diagnostic tests. The research method is quantitative descriptive. Analysis process of misconceptions using modified CRI. The validity of diagnostic tests is between 0.197 to 0.798, and reliability is 0.753 and 0.626. The research subjects were 224 people consisting of class XI students, class XII students, second semester students, and 4</pre>^th<pre> semester students. The results showed that the average percentage of acid-base misconceptions in class XI students to 4th semester students respectively was 50.30%; 56.84%; 53.81%; and 41.07%. Misconceptions that often occur in students and students related submicroscopic representations.</pre><pre> </pre><strong>Abstrak: </strong>Penelitian ini bertujuan untuk mendeskripsikan miskonsepsi asam basa pada lintas jenjang pendidikan menggunakan tes diagnostik berbasis multipel representasi. Metode penelitian adalah deskriptif kuantitatif. Cara analisis miskonsepsi menggunakan CRI termodifikasi. Validitas tes diagnostik antara 0,197 hingga 0,798, dan reliabilitas sebesar 0,753 dan 0,626. Subjek penelitian sebanyak 224 orang yang terdiri dari siswa kelas XI, siswa kelas XII, mahasiswa semester II, dan IV. Hasil penelitian menunjukkan rata-rata persentase miskonsepsi asam basa pada siswa kelas XI hingga mahasiswa semester IV secara berurutan adalah 50,30%; 56,84%; 53,81%; 41,07%. Miskonsepsi yang sering terjadi pada siswa dan mahasiswa terkait representasi submikroskopik.

Penelitian bertujuan untuk mengetahui efek radiasi sinar matahari dan sinar ultra violet pada plastik styrofoam kemasan makanan dan minuman. Sampel yang digunakan pada penelitian ini adalah styrofoam pengemas makanan dan minuman. Lembaran styrofoam dibuat film tipis dan lempeng tipis, selanjutnya sebagian sampel dipaparkan pada sinar matahari dan sebagian sampel dipaparkan sinar ultra violet menggunakan lampu uv dengan daya 20 watt dalam waktu yang sama yaitu 10, 25, dan 40 hari. Karakterisasi styrofoam meliputi uji tarik, spektroskopi infra merah, dan pengamatan fisik. Hasil penelitian ini menunjukkan bahwa radiasi sinar matahari maupun sinar ultra violet dapat menyebabkan degradasi pada styrofoam. Radiasi sinar matahari dan sinar ultra violet pada styrofoam dapat menyebabkan penurunan kekuatan tarik, peningkatan konsentrasi relatif stirena oksida, perubahan warna sampel dari putih menjadi kuning dan timbul retakan. Semakin lama waktu radiasi baik radiasi sinar matahari maupun sinar ultra violet dapat mempercepat degradasi.

To generate hydrogen from its storage as NaBH4, a catalyst was synthesized via an electrochemical method. The catalyst, Ni-Co, had hydroxyapatite as a support catalyst. The electrochemical cell consisted of a DC power supply, a carbon anode and cathode, and a bipolar membrane to separate the cell into two chambers. The current density was adjusted to 61, 91, and 132 mA/cm2. The electrolysis time was 30, 60, and 90 min. The particles produced were analyzed by XRD and SEM/EDX and tested in the hydrolysis of NaBH4 for hydrogen generation. The Ni-Co/HA catalyst test concluded that the period of time used for electrolysis during catalyst formation was positively correlated with the rate of NaBH4 hydrolysis in the production of hydrogen. The highest rate of hydrogen production was obtained using the synthesized catalyst with a current density of 92 mA/cm2. The NaBH4 hydrolysis reaction followed a first-order reaction with the rate constant of (2.220–14.117)•10-3 l/(g•min). The Arrhenius equation for hydrolysis reactions within the temperature range of 300–323 K is k = 6.5•10-6exp(-6000/T).

The result of burning hydrogen which is environmentally friendly makes hydrogen as a very attractive fuel. Hydrogen storage is interesting research material. One alternative to hydrogen storage is a metal-hydride as NaBH4. In this paper, the catalyst for hydrogen production from storage, namely The result of burning hydrogen, which is environmentally friendly, makes hydrogen a desirable fuel. Hydrogen storage is exciting research material. One alternative to hydrogen storage is a metal-hydride as NaBH4. In this paper, the catalyst for hydrogen production from storage, namely NaBH4, was synthesized by electrochemical. Ni-B catalyst with hydroxyapatite as catalyst support was prepared by electrochemical. Ni-B/HA catalyst was synthesized at various current densities (namely 67, 133, and 200 mA/cm2) and various electrolysis times (namely 30, 60, and 90 minutes). The resulting catalysts were analyzed by XRD and used as the catalyst for hydrogen production from the hydrolysis reaction of NaBH4. The fastest hydrogen production was obtained using a catalyst generated at 133 mA/cm2 and an electrolysis time of 60 minutes. The reaction rate equation for the hydrolysis of NaBH4 has a first-order reaction to the concentration of NaBH4. The resulting reaction rate constant ranged from 233.33 mL/g/min to 861.11 mL/g/min. The relationship between reaction temperature and reaction rate constant can be expressed by the equation k = 2.2x106exp (5534/T).