Penelitian ini bertujuan untuk mengetahui kelayakan lembar kerja siswa meliputi kevalidan, keefektifan, dan kepraktisan dari LKS berorientasi direct instruction melalui blended learning pada materi hidrokarbon. Jenis penelitian yang digunakan adlaah penelitian dan pengembangan dengan model 4-D dari Thiagarajan,dkk (1974). Terdapat 4 tahapan pada penelitian dan pengembangan ini yaitu tahap pendefinisian, perancangan, pengembangan, dan penyebaran. Akan tetapi pada tahap penyebaran tidak dilakukan karena penelitian ini terbatas pada tahap uji coba. Lembar kerja siswa ini ditelaah dan divalidasi oleh 2 dosen kimia UNESA dan 1 guru SMA Kemala Bhayangkari 1 Surabaya. Subyek penelitian dalam uji coba kelayakan adalah 15 siswa kelas XI MIA 6 SMA Kemala Bhayangkari 1 Surabaya. Hasil penelitian menunjuukan bahwa ketiga LKS dinyatakan valid dengan kategori layak dan sangat layak dengan perolehan persentase kelayakan sebesar (a)LKS-1 90,48% (b)LKS-2 82,70%, dan (c)LKS-3 82,70%. Dan hasil penelitian menunjukkan bahwa ketiga LKS dinyatakan efektif dilihat dari hasil belajar siswa yang secara berurut-urut mengalami peningkatan pada kompetensi pengetahuan. Dan dari hasil penelitian juga menunjukkan bahwa ketiga LKS dinyatakan praktis ditunjukkan dengan hasil respon siswa mendapatkan kategori sangat layak disetiap aspeknya.

Kata Kunci : LKS, direct instruction, blended learning, hidrokarbon

This research aims to find out the feasibility of the student worksheet that includes  a valid, effectiveness, and practically of student worksheet oriented direct instruction through blended learning on hydrocarbon. This type of research is research development refers to the four D model of Thiagarajan  (1974). There    are four stages in the development of research is stage of define, design, develop, and disseminate, but in this stage of disseminate was not done because  the  research was limited to the initial trials. This student  worksheet  has  been  analyxed and validated by two lecturers of chemistry from UNESA and chemistry teacher from SMA Kemala Bhayangkari 1 Surabaya. The subject of research in testing the feasibility of worksheets student is 15 students of Class XI-MIA 6 SMA Kemala Bhayangkari 1 Surabaya. The result showed that a third of the students stated valid worksheet with a worthy and very worthy category, with  the  percentage gain of eligibility (a)student worksheet-1 80,44% (b)student worksheet-2 82,70% and (c)student worksheet-3 82,70%. From the results of the study  showed that a third student worksheet was declared effective as seen from  the student learning outcomes in succession has increased on the competency of knowledge. And from the resultsof the study also showed that a third student worksheet was declared practically demonstrated by the results of the response of students got very worthy category for each of its aspects.

Keywords: Student worksheet,  Direct  Instruction,  Blended  Learning, Hydrocarbon