Development of Achievement Test about Unit of "Nature and Chemistry" for 9th Grades: A Validity and Reliability Study

This study aims to develop a valid and reliable achievement test concerning Unit of “Nature and Chemistry” for the 9th grade. For this purpose, the 2018 Secondary School Chemistry Curriculum and textbooks were examined, and 53 questions were prepared by taking into consideration these acquisitions. After the questions were reviewed by two faculty members, the test was examined by two chemistry teachers to provide content validity. Based on the expert opinions, the number of questions was reduced to 29. The pilot study was carried out with 181 (89 female, 92 male) 10th-grade students attending three different high schools. At the end of this application, Cronbach's Alpha was calculated as 0.889, and it was decided to remove the four questions from the test. “Nature and Chemistry Unit Achievement Test” developed was applied to 421 students. Cronbach Alpha was re-calculated as 0.886. As a result of the factor analysis, it was determined that the test consisted of 4 factors and Cronbach Alpha values of each factor were between 0.61 and 0.76, respectively