Entalpi Pendidikan Kimia e-issn: 2774-5171 100 Analisis Keterampilan Proses Sains Siswa Menggunakan Model Pembelajaran Creative Problem Solving pada Materi Kelarutan dan Hasil Kelarutan The Analysis of Student Science Process Skill Using Creative Problem Solving Learning Model on Solubility and Its Product Lesson Heppy Okmarisa 1* , Rira Octa Ningsi 2 , dan Nofri Yuhelman 3 1 Program Studi Pendidikan Kimia, Fakultas Tarbiyah dan Keguruan, Universitas Islam Negeri Sultan Syarif Kasim Riau, Indonesia. 2 Program Studi Pendidikan Kimia, Fakultas Pendidikan Matematika dan Ilmu Pengetahuan Alam, Universitas Pendidikan Indonesia, Indonesia 3 Program Studi Pendidikan Kimia, Fakultas Tarbiyah dan keguruan, Universitas Islam Kuantan Singingi, Indonesia. * Email: heppyokmarisa91@gmail.com ABSTRACT Science learning which has lesson of concern makes students still not wholly able to develop their knowledge. This study aims to determine and explain the students level of science process skills using creative problem solving (CPS) models for students in practical activities and discussions. This research was conducted in the second semester of class XI IPA4 State Senior High School 1 Kampar in the 2018/2019 academic year. The selected material is solubility and solubility product (Ksp). Which designed by One Shoot Case Study without a comparison group using a sample of 34 students. The research instrument consisted of observation sheets, essay tests, and interviews used to determine the level of students' science process skills. Based on the data obtained, it shows that the highest aspect of students' science process skills is observing. Judging from the observation sheet on practicum activities, the average percentage is 77.82%. The lowest aspect of science process skills is the theoretical aspect which is only 61.29%. In comparison, the observation in discussion activities without practicum is also the highest aspect of observing with a percentage of 79 .99% and the lowest on the theoretical aspect of 69.98% and 88.88% based on post-test questions with good categories. Overall, the results of data analysis showed that the students' science process skills were good. Keywords: Science Process Skill, Creative Problem Solving (CPS), Solubility and its Product