Jurnal Akademika Kimia, 11. : 117-121. May 2022 ISSN . 2477-5185 | ISSN . 2302-6030 http://jurnal. id/index. php/jak/ OPEN ACCESS Analysis of The Ability to Understand the Basic Law of Chemistry for Science High School Students *Irma Ragentu & Suherman Program Studi Pendidikan Kimia/FKIP Ae Universitas Tadulako. Palu Ae Indonesia 94119 Received 26 March 2022. Revised 29 April 2022. Accepted 23 May 2022 doi: 10. 22487/j24775185. Abstract This study aimed to describe the student's capability of grade XI Science at SMA 3 Palu in understanding Fundamental Chemical Laws. This study was a qualitative descriptive study. The sample was students in the class XI Science 7, which amounted to 29 students, and XI Science 8, which amounted to 31 students. The sample was determined based on non-probability sampling with a purposive technique based on the suggestions from the chemistry teacher that the two classes were homogeneous. Data were obtained from the six tests of students' understanding of fundamental Chemical Laws consisting of six essay questions and supported by the interview results. Respondents for the interview were six students based on the categorization of high, medium, and low scores, which were obtained from calculating the average score of students and standard deviation. The results showed that the capability to understand fundamental Chemical Laws of students of grade XI Science at SMA 3 Palu, which was included in the high category, was the ability to interpret as much as 79. and included in the excellent category was the ability to classify as much as 56. In contrast, those in the low category could exemplify, conclude, compare, and explain, with as much as 30%, 24. 58%, 32. 08%, and 40. 42%, respectively. Keywords: StudentsAo understanding, fundamental chemical laws Introduction The primary purpose of education is to improve student achievement. According to constructivism, learning is a cognitive process and occurs through the construction of knowledge in the mind of the learner (Bodner, 1. Learning is a series of activities carried out consciously by a person and results in changes in him in the form of additional knowledge or semi-permanent skills (Ristiyani & Bariah, 2. Studying chemistry emphasizes mastering concepts and solving chemistry problems and calculations ((Aulia et al. Chemistry is one of the branches of Natural Sciences that is very important, has a direct relationship, and contributes to the development of other sciences (Allo et al. , 2. Chemistry is a science whose primary purpose is to describe and explain chemical changes ((Hesse & Anderson. Chemistry studies the structure, properties of matter, the evolution of one material into another, and the energy that accompanies these changes (Kurniawati et al. , 2. The chemistry study covers many things, including the properties of substances, the structure of meanings, and changes in substances, which are chemical reactions, laws, principles, concepts, and theories. The study material consists of ideas that are interconnected with each other (Norjana et al. , 2. Chemistry learning is directed at a scientific approach where science process skills are carried out through experiments to prove a truth. Based on experience, they directly form the concepts, principles, and theories that underlie them (Magdalena et al. , 2. According to Zidny et al. , chemical phenomena can be explained by three levels of representation: macroscopic, submicroscopic, and symbolic. An in-depth understanding of chemistry will be obtained by connecting each level of these representations (Jansoon el at. , 2. Ishartono et al. said that some of the factors of learning chemistry seem challenging to namely, the concepts in chemistry are abstract, and the concept of learning chemistry has a unique vocabulary where studying chemistry is like learning a new language. Wasonowati et al. a *Correspondence: Irma Ragentu e-mail: Irma. poso@gmail. A 2022 the Author. retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4. 0 International, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Irma Ragentu & Suherman. explained that these difficulties could impact students' understanding of various chemical concepts because abstract facts are explanations for facts from concrete concepts. Therefore, learning chemistry requires a basic understanding of the material to solve chemistry problems. Stylianides & Stylianides . said that in learning, the ability to understand is a part that is increasingly being considered by many academics and is a goal . for all students/students in each subject or course. Chemistry is considered complex, abstract, mathematical, and only for bright students because chemistry has a unique vocabulary, mathematical calculations, and representations unique to the discipline (Lansangan et al. , 2. can be an obstacle for students in studying Nirmalasari . said that the existence of learning barriers is an obstacle experienced by a person, so it is challenging to understand learning and unable to achieve the learning objectives. Understanding can be defined as the ability to absorb/capture the meaning and meaning of the material/material being studied (Nirmalasari. According to Sudjana . , understanding is the result of learning. for example, students can explain in their sentences what they read or hear, give examples from what the teacher has exemplified, and use application instructions in other cases. Understanding the material is the main requirement for a student to master learning (Surgandini & Sulistiawati, 2. Understanding can be abstracted as a basis for obtaining problem solving skills, creative and critical thinking, and decision-making (Elisa et al. , 2. Understanding is the basis for students to build their insight. From the description, it can be seen that the understanding process is very important in understanding chemistry, which is mostly abstract. Lamalat et al. revealed that the fundamental law material of chemistry is one of the materials that is still considered difficult for students to understand because this material is abstract and The subject matter of the fundamental laws of chemistry is material in the form of combining mathematical concepts and calculations, so a high way of thinking and analysis is needed to build and relate the given legal Carolin et al. said that the fundamental law of chemistry is one of the abstract and mathematical materials of chemistry, so understanding the basic rule of chemistry students is still considered difficult for students. This material is essential because the concepts in the fundamental laws of chemistry will be used to study the material for chemical calculations. Susanto et al. argued that the fundamental laws of chemistry are problematic for students because they are abstract, concrete, and They were indicated by 47. 48% of class X students of SMAN 2 Karanganyar in the 2010-2011 academic year who did not complete the daily test of the fundamental laws of chemistry. Observations made at SMA Negeri 3 Palu during the Introduction to the Schooling Environment (PLP), the fundamental law of chemistry is also considered difficult for students. Based on the test scores for the fundamental law of chemistry class X MIA 5 SMAN 3 Palu for the 2016/2017 academic year, the completeness of the material is only As many as 20. 58% of students are the data is still below the KKM, 71. Based on the description above, it is crucial to analyze students' ability to understand chemistry learning materials. A basic understanding of students is needed to know the characteristics of student learning and help educators formulate how to instill good chemical concepts in students. One of the materials that require a good understanding of students in chemistry is the material of the fundamental laws of chemistry because this material is one of the foundations of stoichiometric calculations in chemistry. This paper is intended to describe the ability to understand the primary legal material of chemistry in class XI MIA SMA Negeri 3 Palu. Methods The type of research used in this research is descriptive qualitative. The population in this study were all class XI MIA SMA Negeri 3 Palu students in the 2018/2019 academic year who had followed the fundamental law of chemistry. At the same time, the sample is class XI MIA 7, totaling 29 students, and XI MIA 8, counting 31 students. Sampling in this study was determined based on non-probability sampling with a purposive sampling technique in which the sample of data sources with specific This consideration is based on the chemistry teacher's suggestion to choose classes XI MIA 7 and XI MIA 8 because they have homogeneous abilities (Sugiyono, 2. Volume, 11. No. 2, 2022, 117-121 Jurnal Akademika Kimia Table 1. Category of determining interview Value Category High Currently Low Value Range Score >ycuI SD ycuI Ae SD O score O ycuI SD Score