Lembar Kerja Siswa 1. Lampiran A.8. Tujuan Pembelajaran

Lampiran A.8

Lembar Kerja Siswa 1 Mata Pelajaran

: Kimia

Pokok Bahasan

: Sifat Koloid Efek Tyndall

Kelas / Semester

: XI IPA / Ganjil

Alokasi Waktu

: 2 x 45 menit

Tujuan Pembelajaran

1. Siswa mampu menganalisis sifat efek Tyndall melalui latihan prediksi 2. Siswa dapat merencanakan percobaan sifat efek Tyndall berlandaskan prediksi yang dikemukakan sebelumnya 3. Siswa dapat mengelompokkan sistem koloid berdasarkan fase terdispersi dan medium pendispersi melalui observasi yang dilakukan. 4. Siswa dapat menyimpulkan sifat koloid efek Tyndall melalui observasi percobaan secara tepat 5. Siswa dapat membuat definisi sifat efek Tyndall dengan benar berdasarkan argumentasi yang logis 6. Siswa dapat menerapkan sifat efek Tyndall dalam kehidupan sehari-hari (seperti kabut, debu, asap) berdasarkan argumentasi yang logis.

Yumike Mose, 2014 Penerapan Model Pembelajaran Predict-Observe-Explain (POE) Pada Materi Koloid Untuk Meningkatkan Keterampilan Berpikir Kritis dan Keterampilan Proses Sains Siswa Universitas Pendidikan Indonesia | repository.upi.edu | perpustakaan.upi.edu

I. Kegiatan Siswa

Predict  Berikut ini terdapat tiga bahan yaitu susu bubuk, kopi bubuk, garam dapur dan santan .

Susu bubuk o o

o

Kopi bubuk

Garam dapur

Santan

Masing-masing zat dilarutkan ke dalam air, apa yang akan terjadi? Apa yang terjadi ketika masing-masing campuran tersebut dikenai cahaya? Mengapa demikian. Manakah yang termasuk koloid, larutan, dan suspensi? Jelaskan! Buatlah rencana percobaan untuk pengujian campuran tersebut!

Jawaban Prediksi : ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... Yumike Mose, 2014 Penerapan Model Pembelajaran Predict-Observe-Explain (POE) Pada Materi Koloid Untuk Meningkatkan Keterampilan Berpikir Kritis dan Keterampilan Proses Sains Siswa Universitas Pendidikan Indonesia | repository.upi.edu | perpustakaan.upi.edu

Observe

Untuk membuktikan prediksi kalian, mari kita selidiki

Koloid memiliki sifat yang khas, yang membedakan koloid dengan larutan dan suspensi. Untuk membedakan ketiga jenis campuran tersebut lakukanlah percobaan berikut ini.  Sebelum melakukan percobaan, siapkan terlebih dahulu alat-alat dan bahan berikut ini Alat-alat Bahan o o o o o o o o

Kotak karton (kardus) Gunting Lampu senter Gelas kimia 100 ml / gelas aqua Gelas ukur Corong Spatula / sendok teh Kertas saring

1 buah 1 buah 1 buah 8 buah 1 buah 4 buah 4 buah 4 buah

o o o o o

Garam dapur Kopi Susu bubuk Santan cair Air

 Prosedur Percobaan a. Buatlah alat untuk menguji kemampuan menghamburkan cahaya dengan cara  Siapkan kotak kardus yang salah satu muka digunting penuh  Membuat sebuah lubang kecil pada sisi samping kardus untuk lubang penyinaran senter  Membuat sebuah lubang kotak sebesar ukuran gelas kimia pada bagian depan kardus sebagai lubang pengamatan  Meletakan kardus dengan bagian muka kosong menghadap ke bawah b. Isilah 4 gelas kimia dengan 50 ml air, beri label 1, 2, 3 dan 4 c. Tambahkan masing-masing 2 sendok teh garam, kopi, santan cair dan susu bubuk ke gelas kimia 1, 2, 3, dan 4 d. Aduklah setiap campuran, perhatikan zat yang dicampurkan larut atau tidak, lakukan uji penghamburan cahaya untuk masing-masing gelas kimia dengan cara meletakan gelas kimia ke dalam kardus dan mengarahkan lampu senter Yumike Mose, 2014 Penerapan Model Pembelajaran Predict-Observe-Explain (POE) Pada Materi Koloid Untuk Meningkatkan Keterampilan Berpikir Kritis dan Keterampilan Proses Sains Siswa Universitas Pendidikan Indonesia | repository.upi.edu | perpustakaan.upi.edu

kearah lubang penyinaran. Kemudian lakukan pengamatan, melalui lubang pengamatan dan catat hasil pengamatanmu e. Setelah semua gelas diuji penghamburan cahaya, aduk kembali masingmasing campuran, kemudian diamkan beberapa saat dan catat perubahan apa yang terjadi f. Saringlah masing-masing campuran. Amati campuran manakah yang meninggalkan residu dan bagaimana dengan filtratnya

1. Catat data hasil pengamatan kalian .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... ..........................................................................................................................

2. Catat hasil pengamatan kalian dalam bentuk yang informatif ( tabel atau grafik)


Analisis data yang diperoleh dengan menjawab pertanyaan berikut ini : 1. Apa yang terjadi dengan keempat campuran ketika dilarutkan dalam air, dikenakan cahaya, didiamkan dan disaring? ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ......................................................................................................................................

2. Dari hasil percobaan yang sudah dilakukan dan hasil membaca sumber bacaan, manakah yang termasuk larutan, koloid dan suspensi? Mengapa. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ......................................................................................................................................

3. Sifat koloid apa yang terjadi dalam percobaan yang sudah dilakukan? ....................................................................................................................................... ....................................................................................................................................... ......................................................................................................................................


Explain

Jelaskan hasil percobaan kelompok masing-masing dengan menjawab pertanyaan berikut ini : 1. Bagaimana prediksi anda dengan hasil percobaan yang diperoleh? ........................................................................................................................................... ........................................................................................................................................... .......................................................................................................................................... 2. Definisikan apa yang dimaksud dengan koloid! ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... .......................................................................................................................................... 3. Definisikan sifat koloid yang terjadi dalam percobaan yang sudah dilakukan! ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... 4. Berikut ini terdapat contoh-contoh campuran    

1. Gula dalam air 2. Teh bubuk dalam air 2. Pasir dalam air 3. Krim kopi

5. 6. 7. 8.

Cat Kabut Alkohol Debu

9. 10. 11. 12.

Tinta Awan Cuka Hairspray

Kelompokan campuran tersebut kedalam larutan, koloid dan suspensi. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... Yumike Mose, 2014 ........................................................................................................................................... Penerapan Model Pembelajaran Predict-Observe-Explain (POE) Pada Materi Koloid Untuk Meningkatkan Keterampilan Berpikir Kritis dan Keterampilan Proses Sains Siswa ........................................................................................................................................... Universitas Pendidikan Indonesia | repository.upi.edu | perpustakaan.upi.edu

...........................................................................................................................................

5.

Dari jawaban no 1, tentukan fase terdispersi dan medium pendispersi dari koloid serta

nama dari tipe koloid tersebut. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... ................................................................................................. 6.

Mengapa kita dapat melihat berkas sinar yang masuk melalui celah lubang kecil kamar

kita? Jelaskan. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... ......................................................................................................................................................... 7.

Mengapa koloid dapat bersifat stabil? Jelaskan.

.......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .........................................................................................................................................................

Berikan Kesimpulan : ..................................................................................................................................................... ..................................................................................................................................................... ..................................................................................................................................................... ..................................................................................................................................................... ..................................................................................................................................................... ...............................................................................................................................................


Lembar Kerja Siswa 1. Lampiran A.8. Tujuan Pembelajaran

Recommend Documents