Student Difficulties in Understanding Limiting Reagents in North Barito Regency High Schools and Palangka Raya City in 2015/2016 Academic Year

  • Siti Hayati SMA Negeri 2 Muara Teweh
  • Suandi Sidauruk Universitas Palangka Raya
  • Abudarin Universitas Palangka Raya
Keywords: difficulties, representation level, macroscopic level, microscopic, limiting reagens

Abstract

This study aims to identify and explain the difficulties of high school class XI science students in North Barito Regency and Palangka Raya City in understanding the concept of limiting reagents, including: (a) determining the limiting reagents in a reagent, if the pictures of all reagents are in the form of elements and gas molecules; (b) determine the limiting reagents in a reaction, if drawing all the reagents in a gas molecule; (c) determine the limiting reagents in a reaction, if known moles of each reagent; (d) determining the reactants in a reaction; if the mass of each reagent is known. The population of the study is the students of class XI IPA of State High Schools in the District of North Barito and the City of Palangka Raya with a sample of 367 students. The students' difficulties were examined by using the limiting reagent concept understanding instrument (TPKPP) accompanied by interviews to explore the difficulties experienced by students. The instrument used to measure students' understanding at the macroscopic level and the microscopic level is a written test equipped with four answer choices and four choice reasons. The validity of the content was tested by four experts. The average level of difficulty is 0.42 and the difference is 0.49. Test reliability was calculated using Cronbach's Alpha. The results showed that each student indicator had difficulty understanding the concept of limiting reagents in terms of the macroscopic level of an average of 67.24% of students. In terms of the microscopic level, the average is 49.33% of students. This means that the macroscopic level of difficulty is higher than the microscopic level of difficulty. Difficulties at the macroscopic level identified are students having difficulty in converting volume, mass into units of moles. Difficulties at the microscopic level identified are students having difficulty in understanding the microscopic picture so that in solving problems students tend to choose answers according to the key but wrong in choosing reasons. In this study identified four causes of high school students' difficulty in understanding the concept of limiting reagents namely students assume limiting reagents are: (a) reagents that have a small coefficient; (b) reagents that have large coefficients; (c) reagents that have small moles; (d) reagents that have smaller masses.

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Author Biographies

Siti Hayati, SMA Negeri 2 Muara Teweh

SMA Negeri 2 Muara Teweh, Kalimantan Tengah, Indonesia

Suandi Sidauruk, Universitas Palangka Raya

Pendidikan Kimia, Pasca Sarjana, Universitas Palangka Raya, Indonesia

Abudarin, Universitas Palangka Raya

Pendidikan Kimia, Pasca Sarjana, Universitas Palangka Raya, Indonesia

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Published
2018-12-31
How to Cite
[1]
Hayati, S., Sidauruk, S. and Abudarin 2018. Student Difficulties in Understanding Limiting Reagents in North Barito Regency High Schools and Palangka Raya City in 2015/2016 Academic Year. Jurnal Ilmiah Kanderang Tingang. 9, 2 (Dec. 2018), 114-132. DOI:https://doi.org/10.37304/jikt.v9i2.11.

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