Corrosion is a process of degradation of metal-based materials that is detrimental to industry, especially in the oil and gas sector, due to the interaction between metals and their environment. In industry, one of the factors causing corrosion is the activity of microorganisms such as sulphate reducing bacteria (SRB) that grow under anaerobic and thermophilic conditions. SRB utilize sulfate io…
ABSTRACT Oyster mushroom baglog waste is a residual growing medium left after oyster mushroom cultivation that is no longer productive if not managed properly, it can cause enviromental problems. This study aims to determine the effect of varying Promi concentrations and composting durations on the quality of compost produced from oyster mushroom baglog waste. The method used is anaerobic deco…
ABSTRACT Toothpaste is a preparation for cleaning and polishing the surface of teeth consisting of fine CaCO3 (calcium carbonate), mixed with glycerin plus natural ingredients to inhibit the growth of germs and provide a fresh taste so that users like it. This study used variations of betel leaf extract with the maceration method. The solvent used must be able to extract the desired substance …
ABSTRACT The increasing production of oyster mushrooms (Pleurotus ostreatus) has led to a significant rise in baglog waste. This waste has the potential to pollute the environment if not properly utilized. One way to manage this waste is by processing it into compost. However, the low nitrogen content in baglog waste necessitates the addition of other materials, such as cow manure and bioactiv…
ABSTRACT The increasing production of oyster mushrooms (Pleurotus ostreatus) has led to a significant rise in baglog waste. This waste has the potential to pollute the environment if not properly utilized. One way to manage this waste is by processing it into compost. However, the low nitrogen content in baglog waste necessitates the addition of other materials, such as cow manure and bioactiv…
ABSTRACT Rice husk is an organic material that has a high lignocellulose content, making it potential for use as an adsorbent. One method of preparing adsorbents is through activation with Sodium Hydroxide (NaOH), Phosphoric acid (H3PO4), and without activation. The aim of this research is to study the effect of varying concentrations of NaOH and H3PO4 as activators on the adsorption capac…
ABSTRACT Instant bread yeast is a common leavening agent used in bread making and contains the microorganism Saccharomyces cerevisiae. However, natural yeast is now being considered as an alternative due to its several advantages, including the ability to enrich flavor, extend product shelf life, and be more easily digested. This research aims to produce natural yeast through the fermentation …
ABSTRACT Silica gel is one of the silica-based materials that has quite extensive uses such as in the pharmaceutical industry, ceramics, paints and special applications in the chemical field. This study aims to synthesize silica gel from Bengkalis Beach sand by varying the concentration of HCl during gel formation. Silica gel is synthesized through several stages starting with the leaching pro…
ABSTRACT Silica gel is one of the silica-based materials that has quite extensive uses such as in the pharmaceutical industry, ceramics, paints and special applications in the chemical field. This study aims to synthesize silica gel from Bengkalis Beach sand by varying the concentration of HCl during gel formation. Silica gel is synthesized through several stages starting with the leaching pro…
ABSTRACT The increase in the number of laundry services will be directly proportional to the amount of liquid waste generated at the end of the activity. Therefore, it is necessary to develop effective and environmentally friendly waste treatment methods. The adsorption process is still the best choice for liquid waste treatment, especially if it uses environmentally friendly adsorbents, for e…
ABSTRACT Instant yeast is a leavening agent in making bread containing microorganisms of the Saccharomyces cerevisiae type. However, sourdough is now starting to be considered as an alternative because it has several advantages, including being able to enrich the taste, extend the shelf life of the product, and being easier to digest. This study aims to produce natural yeast through fermentati…
ABSTRACT The increase in the number of laundry services will be directly proportional to the amount of liquid waste generated at the end of the activity. Therefore, it is necessary to develop effective and environmentally friendly waste treatment methods. The adsorption process is still the best choice for liquid waste treatment, especially if it uses environmentally friendly adsorbents, for e…
ABSTRACT Silica gel is a material widely used in the industrial sector as an adsorbent, filler, and catalyst support. It can be synthesized from various natural sources containing silica (SiO₂), one of which is laboratory glass waste. In this study, silica gel was synthesized from laboratory glass waste through the production of sodium silicate, followed by precipitation using HCl solution. …
ABSTRACT Silica gel is a material widely used in the industrial sector as an adsorbent, filler, and catalyst support. It can be synthesized from various natural sources containing silica (SiO₂), one of which is laboratory glass waste. In this study, silica gel was synthesized from laboratory glass waste through the production of sodium silicate, followed by precipitation using HCl solution. …
This research aims to determine the influence of self-efficacy and communication skills on the learning outcomes of 11th-grade students in chemistry, both partially and simultaneously, at SMA Negeri 4 Pekanbaru. This type of research is a survey study with a quantitative approach. The data collection methods in this research include questionnaires and documentation. The questionnaire in the res…
This research aims to determine the influence of interpersonal communication skills and self-confidence on 10th-grade students' chemistry learning outcomes, both partially and simultaneously, at SMA Negeri 4 Pekanbaru. This type of research is a survey study with a quantitative approach. The data collection methods used in this study are questionnaires and documentation. The validated questionn…
The study aims to determine whether the application of the POE2WE learning model can improve students' learning outcomes on the topic of Acids and Bases. The research conducted was an experimental study using a Randomized Control Group Pretest-Posttest design. The experimental class was given treatment in the form of the application of the POE2WE learning model and the control class withou…
Learning problems in class XI-4 SMAN 12 Pekanbaru that need further attention include learning activities and scientific literacy skills. The results of pre-research in the even semester of 2023/2024 showed that students' learning activities on the indicators of asking questions were only 13.33%, conveying responses or opinions 6.66%, discussing 22.22%, and working on problems 22.22%. Likewise …
Kegiatan pembelajaran menjadi salah satu aspek krusial yang turut berperan penting sebagai bekal mahasiswa dalam menghadapi berbagai hal yang ada di kehidupan saat ini maupun di masa yang akan datang. Kegiatan pembelajaran yang baik tentunya tidak terlepas dari dukungan bahan ajar yang memadai. Bahan ajar yang dikembangkan secara tepat serta sesuai dengan kebutuhan dosen dan mahasiswa diharapka…
This study aims to improve learning activities and critical thinking skills of students by implementing the discovery learning model. This type of research is classroom action research. Data collection was carried out in January 2025. The sample in this study were 36 students of class XI 1 SMAN 6 Pekanbaru. The instruments used were observation sheets of student and teacher activities, evaluati…