In the next phase of the review test instruments, consist of: a) writing about the test instrument b) validity test by experts and c) revision of test instruments based on the validator. Phases of the design and review of test instruments consist of two steps, namely a draft design of test instruments include: a) analysis of the depth of teaching materials b) the selection of indicators and sub-indicators of critical thinking skills c) analysis of indicators and sub-indicators of critical thinking skills d) implementation of indicators and sub-indicators of critical thinking skills and e) making the descriptions about the test instrument. Untuk air pada suhu 15oC dan tekanan tetap 1 atm, cair 1 kkal/kgoC 4,19 × 103 J/kgoC. Kalor jenis suatu zat dinyatakan dalam satuan J/kgoC (satuan SI yang sesuai) atau kkal/kgoC. Phases of preliminary study include: a) policy studies b) survey to the school c) and literature studies. T kenaikan/perubahan suhu zat (oC) Dari persamaan (1) tersebut, c adalah besaran karakteristik dari zat yang disebut kalor jenis zat. The form of test instruments in essay questions, consist of 18 questions that was divided into 5 indicators and 8 sub-indicators of the critical thinking skills expressed by Ennis, with questions that are qualitative and contextual. This research using a mixed methods with sequential exploratory design, consists of: 1) a preliminary study 2) design and review of test instruments. This study aimed to construct test instrument of critical thinking skills of high school students related the concept on sound wave.
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