TUGAS PENYUSUNAN RENCANA PEMBELAJARAN KIMIA (KD 3.2 )
DISUSUN OLEH
KELOMPOK 2
PROGRAM PENDIDIKAN PROFESI GURU PENDIDIKAN KIMIA UNIVERSITAS HALU OLEO 2019
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RENCANA PELAKSANAAN PEMBELAJARAN (RPP) Sekolah Mata pelajaran Kelas/Semester Kelas/Semest er /T.P Materi Pokok Alokasi Waktu
: SMA : Kimia : X/1/2018-2019 : Struktur Atom : 6 X 45 menit (2 Pertemuan)
A. Kompetensi Inti (KI)
Kompetensi Sikap : Menghayati dan mengamalkan ajaran agama yang dianutnya, menunjukkan perilaku jujur, disiplin, tanggung jawab, peduli (gotong royong, kerja sama, toleran, damai), santun, responsif, dan pro-aktif sebagai bagian dari solusi atas berbagai permasalahan dalam berinteraksi secara efektif dengan lingkungan sosial dan alam serta menempatkan diri sebagai cerminan bangsa dalam pergaulan dunia”. dunia”. KI-3: Memahami, Memahami, menerapkan, menganalisis pengetahuan faktual, konseptual, prosedural berdasarkan rasa ingin tahunya tentang ilmu pengetahuan, teknologi, seni, budaya, dan humaniora dengan wawasan kemanusiaan, kebangsaan, kenegaraan, dan peradaban terkait penyebab fenomena dan kejadian, serta menerap-kan pengetahuan prosedural pada bidang kajian yang spesifik sesuai dengan bakat dan minatnya untuk memecahkan masalah. KI-4: Mengolah, menalar, dan menyaji menyaji dalam ranah konkrit dan ranah r anah abstrak terkait dengan pengembangan pengembangan dari yang dipelajarinya dipelajarinya di sekolah secara mandiri, dan mampu menggunakan menggunakan metode sesuai kaidah keilmuan. B. Kompetensi Dasar dan Indikator Pencapaian Kompetensi Kompetensi Kompetensi Dasar Dari KI-3
3.2
Menganalisis perkembangan model atom dari model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang
Indikator Pencapaian Kompetensi (IPK)
3.2.1 3.2.2
3.2.3 3.2.4
3.2.5
Kompetensi Dasar Dari KI-4
4.2
Menjelaskan fenomena alam atau hasil percobaan menggunakan menggunakan model model atom
C. Tujuan Pembelajaran
Mendeskripsikan perkembangan teori atom/model atom Menjelaskan proses percobaan tentang penemuan partikel penyusun atom Menentukan partikel dasar penyusun atom Menganalisis hubungan nomor atom dan nomor massa suatu atom dengan jumlah partikel dasar penyusun atom Membedakan isotop, isoton dan isobar
Indikator Pencapaian Kompetensi (IPK) 4.2.1
Membuat gambar model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang
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D. Materi Pembelajaran
Struktur Atom 1. Perkembangan Perkembangan Teori Atom 2. Partikel Dasar Penyusun Atom 3. Nomor Atom dan dan nomor massa 4. Isotop, Isobar dan isoton E. Metode Pembelajaran Pendekatan : Saintifik Model Pembelajaran Pembelajaran : Discovery Learning Metode Pembelajaran : Diskusi, presentasi, tanya jawab, dan ceramah F. Media Pembelajaran dan Sumber Belajar 1. Media Pembelajaran : Whiteboard, Whiteboard , LCD, laptop, LKS, serta alat dan bahan percobaan (karton, spidol, , dan balon) 2. Sumber Belajar : Buku Kimia SMA kelas X, dan sumber belajar lain yang relevan G. Langkah-langkah Pembelajaran 1. Pertemuan Ke-1: (3 JP) Indikator Pencapaian Kompetensi:
3.2.1 3.2.2 3.2.3 4.2.1 4.2.2
Mendeskripsikan perkembangan teori atom/model atom Menjelaskan percobaan proses penemuan partikel penyusun atom Menentukan partikel dasar penyusun atom Merancang model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang Gelombang Membuat gambar model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang
Tahapan Pembelajaran: Kegiatan
Sintaks
Pendahuluan
Inti
Stimulation/ Stimulation/ pemberian rangsangan
Problem
Langkah-langkah Kegiatan
Waktu
1. Memberi salam dan berdoa 2. Guru mengecek kehadiran peserta didik 3. Guru mengkondisikan suasana belajar yang menyenangkan 4. Peserta didik menyimak manfaat materi pembelajaranyang pembelajaranyang akan akan dipelajari dalam dalam kehidupan kehidupan sehari-hari 5. Guru menyampaikan tujuan pembelajaran yang akan dicapai 6. Guru menyampaikan lingkup dan teknik penilaian yang akan digunakan 7. Guru bertanya kepada peserta didik “bagaimana “bagaimana proses lampu neon atau lampu pijar bisa menyala ? “pernakah kalian memecahkan lampu neon/pijar dan menemukan suatu partikel kecil didalamnya ? “Siapakah ilmuan yang menjelaskan hal tersebut ? 8. Peserta didik diberi kesempatan untuk bertanya
15’
10’
10’
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Kegiatan
Sintaks
Langkah-langkah Kegiatan
Waktu
Data Processing 11. Secara berkelompok, peserta didik berdiskusi untuk menyelesaikan tugas mengenai: (Pengolahan Partikel dasar penyusunan atom Data) Perkembangan teori atom Perkembangan Perbedaan teori-teori atom
20’
Verification/ Pembuktian
12. Guru meminta peserta didik mempresentasikan mempresentasikan hasil diskusinya di depan kelas dengan cara membacakan hasil diskusi atau menuliskan jawaban di papan tulis sesuai soal tugas pada LKPD. 13. Peserta didik membandingkan hasil gambar teoriteori atom kelompoknya dengan kelompok lainnya.
10’
Generalization/ Menarik Kesimpulan
14. Setelah kegiatan presentasi kelompok selesai, guru mengarahkan peserta didik untuk menyimpulkan materi pembelajaran. 15. Guru melengkapi kesimpulan yang sudah
10’
16.
Penutup
17. 18. 19. 20.
disampaikan peserta didik Guru memfasilitasi dan membimbing peserta didik untuk merefleksi proses dan materi pelajaran Guru memberikan umpan balik terhadap proses dan hasil pembelajaran Guru mengumumkan hasil penilaian kelompok terbaik Guru merencanakan kegiatan tindak lanjut Guru menyampaikan rencana pembelajaran pada pertemuan berikutnya.
15’
Pertemuan 2 Indikator Pencapaian Kompetensi:
3.2.5. Menganalisis hubungan nomor atom dan nomor massa suatu atom dengan jumlah partikel dasar penyusun atom 3.2.6. Membedakan isotop, isoton dan isobar Kegiatan
Sintaks
Pendahuluan
Inti
Stimulation/ Stimulation/ pemberian
Langkah-langkah Kegiatan
1. Guru Memberi salam 2. Guru mengajak siswa berdoa dan mengecek kehadiran peserta didik 3. Guru menyiapkan peserta didik untuk memulai pelajaran 4. Guru mengingatkan kembali peserta didik dengan materi sebelumnya sebelumnya 5. Guru menyampaikan indikator pembelajaran dari materi yang akan dibahas 6. Guru menampilkan model atom Niels Bohr, dan Guru menanyakan : ”Partikel – partikel apa sajakah yang terdapat
Waktu
15’
10’
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Problem Statement / Identifikasi masalah
7. Peserta didik diminta memperhatikan memperhatikan dan menyimak materi yang ditampilkan ditampilkan pada power point 8. Peserta didik diberi kesempatan untuk bertanya setelah memperhatikan dan menyimak materi yang ditampilkan dengan pertanyaan diantaranya sebagai berikut: “Bagaimana membedakan nomor atom dengan nomor massa ? 9. Secara berkelompok peserta didik mencari informasi dari berbagai sumber tentang: massa Nomor atom dan nomor massa Isotop, isobar dan isoton
10’
Data Processing (Pengolahan Data)
10. Secara berkelompok, peserta didik mengolah data yang ada di di LKPD
20’
Verification/ Pembuktian
11. Guru meminta peserta didik mempresentasikan mempresentasikan hasil diskusinya di depan kelas dengan cara membacakan membacakan hasil diskusi atau menuliskan jawaban di papan papan tulis sesuai sesuai soal tugas pada LKPD.
15’ 15’
Generalization/ Menarik Kesimpulan
12. Setelah kegiatan presentasi kelompok selesai, guru mengarahkan peserta didik untuk menyimpulkan materi pembelajaran. 13. Guru melengkapi kesimpulan yang sudah
10’
Data Collection/ Pengumpulan Data
(Selama diskusi kelompok berlangsung, guru melakukan pengamatan sikap dan keaktifan, keaktifan, dan memberikan bantuan kepada kelompok yang mengalami kesulitan)
disampaikan peserta didik 14. Guru memfasilitasi dan membimbing peserta didik dalam merangkum materi pelajaran 15. Guru memberikan umpan balik terhadap proses dan hasil pembelajaran 16. Guru mengumumkan hasil penilaian kelompok terbaik 17. Guru menyampaikan rencana pembelajaran pada pertemuan berikutnya. berikutnya.
Penutup
H. Penilaian Hasil Belajar 1. Teknik Penilaian: a. Penilaian Sikap b. Penilaian Pengetahuan Pengetahuan c. Penilaian Keterampilan
2. Bentuk Penilaian a. Observasi b. Tes tertulis c. Unjuk kerja d. Portofolio
: : : : :
: : :
Observasi/pengamatan/Jurna Observasi/pengamatan/Jurnall Tes Tertulis, Tes Lisan Unjuk Kerja dan portofolio
lembar pengamatan pengamatan aktivitas peserta didik pilihan pilihan ganda lembar penilaian persentasi laporan hasil diskusi
3. Instrumen Penilaian a. Instrumen Penilaian Sikap
40’ 40’
15’
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4. Remedial a. Pembelajaran remedial dilakukan bagi peserta didik yang capaian KD nya belum tuntas b. Tahapan pembelajaran remedial dilaksanakan melalui remidial teaching (klasikal), atau tutor sebaya, atau penugasan dan diakhiri dengan tes. c. Tes remedial, dilakukan sebanyak 3 kali dan apabila setelah 3 kali tes remedial belum mencapai ketuntasan, ketuntasan, maka remedial r emedial dilakukan dalam bentuk penugasan tanpa t es tertulis kembali. 5. Pengayaan a. Bagi peserta didik yang sudah mencapai nilai ketuntasan diberikan pembelajaran pembelajaran pengayaan sebagai berikut: - Peserta didik yang mencapai nilai n(ketuntasan ) n n(maksimum) diberikan materi masih dalam cakupan KD dengan pendalaman sebagai pengetahuan tambahan - Peserta didik yang mencapai nilai n n(maksimum) diberikan materi melebihi cakupan KD dengan pendalaman sebagai pengetahuan tambahan
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Lampiran 1. Materi Pembelajaran Pembelajaran
STRUKTUR ATOM PARTIKEL PENYUSUN ATOM
1. Proton Penemu proton untuk pertama kalinya adalah seorang Fisikawan asal Jerman. Nama penemu proton ini adalah Eugen Eu gen Goldstein, dan ia lahir pada tanggal tangg al 5 September tahun 1850. Seperti dijelaskan tadi bahwa Ia merupakan seorang fisikawan berkebangsaan Jerman. Ia adalah penemu dari sinar anode, dan juga disebut sebagai penemu proton.
Dalam fisika, proton adalah partikel subatomik dengan muatan positif sebesar 1,6 × 10−19 coulomb dan massa 938 MeV (1,6726231 × 10-27 kg, atau sekitar 1.836 kali massa sebuah elektron). Jumlah proton penting untuk menunjukkan nomor atom, karena untuk unsur, nomor atom sama dengan jumlah proton itu dalam inti. Proses Penemuan Proton oleh Eugene Goldstein ( Penemu Proton )
Keberadaan proton dibuktikan melalui percobaan tabung Crookes yang dimodifikasi. Tabung Crookes diisi gas hidrogen dengan tekanan rendah. Percobaan ini dikembangkan oleh Eugen Goldstein. Jika tabung Crookes dihubungkan dengan sumber arus listrik di bagian belakang katode katod e yang dilubangi maka akan terbentuk berkas sinar. Goldstein menamakan sinar
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2. Elektron Elektron ditemukan oleh Joseph John Thomson pada tahun 1897. Penemuan elektron diawali dengan ditemukannya tabung katode oleh William Crookes. Kemudian J.J. Thomson meneliti lebih lanjut tentang sinar katode ini dan dapat dipastikan bahwa sinar katode ini merupakan partikel, sebab dapat memutar baling-baling yang diletakkan di antara katode dan anode.
Tabung sinar katode
Sifat sinar katode, antara lain: a. merambat tegak lurus dari permukaan katode menuju anode b. merupakan radiasi partikel sehingga terbukti dapat memutar baling-baling c. bermuatan listrik negatif sehingga dibelokkan ke k utub listrik positif d. dapat memendarkan berbagai jenis zat, termasuk gelas. Dari hasil percobaan tersebut, J.J. Thomson menyatakan bahwa sinar katode merupakan partikel penyusun atom yang bermuatan b ermuatan negatif dan selanjutnya disebut elektron. e lektron.
3. Neutron Setelah para ilmuwan mempercayai adanya elektron dan proton dalam atom, maka timbul masalah baru, yaitu jika hampir semua massa atom terhimpun pada inti (sebab massa elektron sangat kecil dan dapat diabaikan), ternyata jumlah proton dalam inti belum mencukupi untuk sesuai dengan massa atom. Jadi, dalam inti pasti ada partikel lain yang menemani proton-
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Radiasi ini mampu menghantam proton keluar dari parafin dengan gaya yang sangat kuat. Berdasarkan energi dan momentumnya, hanya partikel netral dengan massa setingkat dengan massa proton yang mampu menghantam proton keluar dari parafin. Oleh karena itu, Chadwick berpendapat bahwa radiasi dengan daya penetrasi kuat ini tentulah ten tulah terdiri atas partikel-partikel partikel -partikel netral dengan massa sesuai untuk neutron. Dengan demikian atom (berilium) mengandung partikel netral, neutron (n), selain proton (p) dan elektron (e), dan ketiganya disebut sebagai partikel dasar penyusun atom.
4. Penemuan Inti Atom Pada tahun 1910, Ernest Rutherford bersama dua orang asistennya, yaitu Hans Geiger dan dan Ernest Ernest Marsden, Marsden, melakukan serangkaian eksperimen untuk mengetahui untuk mengetahui kedudukan partikel-partikel di dalam atom dengan menembakkan sinar alfa (sinar bermuatan positif) yang berkecepatan 10.000 mil/detik pada pelat emas yang sangat tipis. Sinar
merupakan partikel
bermuatan positif yang mempunyai mempu nyai massa 4 sma dan muatan +2 (42He2+). Sebagian besar sinar alfa itu dapat menembus lempeng emas tanpa gangguan, tetapi sebagian kecil dibelokkan dengan sudut yang cukup besar, bahkan ada juga yang dipantulkan kembali ke arah sumber sinar.
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Dari data hasil eksperimen tersebut, Ernest Rutherford menjelaskan sebagai berikut: a. Sebagian besar partikel sinar alfa dapat menembus pelat karena melalui daerah hampa. b. Sebagian kecil partikel alfa (bermuatan positif) yang mendekati inti atom dibelokkan karena mengalami gaya tolak inti (juga bermuatan positif). c. Sebagian kecil partikel alfa yang menuju inti atom dipantulkan karena inti bermuatan positif dan sangat massif (keras dan berat). Berdasarkan data hasil eksperimen dapat disimpulkan bahwa bagian dari atom tersebut ciri-cirinya adalah sangat kecil, bermuatan positif, massanya berat yang selanjutnya disebut inti atom. Akhirnya Rutherford mengusulkan model atomnya yang menyatakan bahwa atom terdiri atas inti atom yang sangat kecil sebagai pusat massa dan bermuatan positif, yang dikelilingi oleh elektron yang bermuatan negatif. Jumlah proton dalam inti sama dengan
jumlah elektron yang mengelilingi inti, sehingga atom bersifat netral. PERKEMBANGAN MODEL ATOM
1. Model Atom Dalton John Dalton (1803), ilmuwan Inggris yang menghidupkan kembali gagasan mengenai atom Democritus. Hukum kekekalan massa yang disampaikan oleh Lavoisier dan hukum perbandingan tetap yang dijelaskan oleh Proust mendasari John Dalton untuk mengemukakan teori dan model atom-Nya pada tahun 1803. John Dalton menjelaskan bahwa: a. Atom merupakan bagian terkecil dari materi yang sudah tidak dapat dibagi lagi. b. Atom digambarkan sebagai bola pejal yang sangat kecil, suatu unsur memiliki atom-atom yang identik dan berbeda untuk unsur yang berbeda. c. Atom-atom bergabung membentuk senyawa dengan perbandungan bilangan bulat dan sederhana. Misalnya air terdiri dari atom -atom hidrogen dan atomatom oksigen.
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Model Atom Dalton
2. Model Atom Thomson J. J. Thomson (1897), fisikawan Inggris yang mengemukakan bahwa terdapat partikel subatom yang disebut elektron yang tersebar di dalam atom. J. J. Thomson merupakan penemu elektron. Thomson mencoba menjelaskan keberadaan elektron menggunakan teori dan model atom-Nya. Menurutnya, elektron tersebar secara merata di dalam atom yang dianggap sebagai suatu bola yang bermuatan positif. Model atom yang dikemukakan oleh Thomson sering disebut sebagai model roti kismis. Dengan roti sebagai atom yang bermuatan positif dan kismis sebagai elektron yang tersebar merata diseluruh bagian roti. Atom secara keseluruhan bersifat netral Kelebihan model/teori atom Joseph John Thompson: Dapat menerangkan adanya partikel yang lebih kecil dari atom. Dapat menerangkan sifat listrik atom. -
Tidak dapat menerangkan efek penghamburan cahaya pada lempeng tipis emas.
Model Atom Thomson 2. Model Atom Rutherford Ernest Rutherford (1911), seorang ahli Fisika Inggris. Penelitian penembakan sinar
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3. Model Atom Niels Bohr Niels Bohr (1913), fisikawan dari Denmark ini yang selanjutnya menyempurnakan model atom yang dikemukakan oleh Rutherford. Penjelasan Bohr didasarkan pada penelitiannya tentang spektrum garis atom hidroge n. Beberapa hal yang dijelaskan oleh Bohr : a.
Elektron mengorbit pada tingkat energi tertentu yang disebut kulit.
b.
Tiap elektron mempunyai energi tertentu yang cocok dengan tingkat energi kulit
c.
Dalam keadaan stationer, elektron tidak melepas dan menyerap energi.
d.
Elektron dapat berpindah posisi dari tingkatenergi rendah dan sebaliknya dengan menyerap dan melepas energi.
Kelebihan model Atom Niels Bohr :
-
Dapat menjelaskan spektrum atom hidrogen
-
Menjawab kesulitan teori atom Rutherford
Kelemahan model/atom atom Niels Bohr: -
Tidak dapat menjelaskan atom berelektron banyak.
-
Tidak dapat menerangkan efek Zeeman bila atom ditempatkan pada medan magnet.
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Model Atom Mekanika Kuantum
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Instrumen Penilaian Pertemuan Ke-1 Pilihan Ganda
1.
2.
3.
4.
“Materi tersusun atas partikelpartikel- partikel partikel terkecil yang tidak dapat dibagi lagi yang disebut atom”. Pernyataan tersebut merupakan salah satu isi dari t eori atom yang dikemukakan oleh … . A. John Dalton B. Rutherford C. Shcrodinger D. J.J Thomson E. Niels Bohr Partikel sinar positif dikenal sebagai … .: A. proton A. proton B. neutron C. elektroan D . a dan b benar E. a, b, dan c benar Partikel dasar penyusun atom terdiri atas . . . . A. Proton, elektron dan positron B. Proton, elektron dan nukleon C. Proton, elektron dan neutron D. Positron, nukleon dan elektron E. Neutron, Nukleon dan elektron Elektron-elektron dalam atom beredar mengelilingi inti dan berada pada lintasan (tingkat energi) tertentu. Elektron dapat berpindah dari satu tingkat energi ke tingkat energi lainnya di serial penyerapan atau
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Uraian
Lengkapilah tabel berikut ini : No
1.
Model Atom
John Dalton
2.
J.J Thomson
3.
Rutherford
4.
Niels Bohr
5.
Mekanika Kuantum / Gelombang
Kelebihan
Kelemahan
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LEMBARAN KERJA PESERTA DIDIK (LKPD) Pertemuan 1
Partikel dasar penyusun atom dan Perkembangan Model Atom Sekolah Mata Pelajaran Kelas/Semester
: SMA Negeri 1 Kaledupa : Kimia Peminatan :X/1
KD 3.2 : Menganalisis perkembangan model atom dari model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang
4.2 : Menjelaskan fenomena alam atau hasil percobaan menggunakan model atom Indikator Pencapaian Kompetensi : 3.2.1 3.2.2 3.2.3 3.2.4
Menjelaskan proses penemuan partikel penyusun atom Menentukan partikel dasar penyusun atom Mendeskripsikan perkembangan teori atom/model atom Membedakan model atom dari model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang
PETUNJUK : 1. Tuliskanlah nama kelompok pada tempat yang tersedia 2. Jawablah pertanyaan – pertanyaan – pertanyaan dalam LKS
Nama kelompok
:
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B. Kegiatan 2 Setelah anda membaca tentang perkembangan teori atom, lengkapilah lengkapilah tabel berikut ini ! No Teori atom Bunyi teorinya Model atom 1.
2.
Atom merupakan bola pejal yang bermuatan positif dan di dalamnya tersebar muatan negatif elektron‖
Thomson
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Rubrik Penilaian Nama peserta didik/kelompok Kelas Tanggal Pengumpulan
:
…………………………………………………
: ………………………………………………….
: .................................... ................................................................. .............................
No
Kategori
1.
Apakah tugas dikerjakan lengkap dan sesuai dengan tanggal pengumpulan yang telah disepakati? Apakah terdapat daftar pustaka sumber infomasi dalam penyelesaian tugas yang dikerjakan? Apakah terdapat gambar / tabel dibuat yang menarik sesuai dengan konsep? Apakah bahasa yang digunakan untuk menginterpretasikan tugas, sederhana, runtut dan sesuai dengan kaidah kaidah EYD? Apakah laporan yang dikerjakan sesuai dengan konsep yang telah dipelajari?
2.
3. 4.
5.
Skor
Alasan
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Lampiran 3: LKS LEMBAR KERJA PRAKTIKUM JUDUL : Model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang Tujuan : Membedakan model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang Indikator Pencapaian Kompetensi:
1.2.1 1.2.2
Merancang model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang Membuat gambar model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang
Alat/Bahan : Kertas Karton, Spidol, Penggaris Cara Kerja :
Ambil Karton dan Spidol
Buat Gambar model atom Dalton, Thomson, Rutherford, Bohr, dan Mekanika Gelombang
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Rubrik Penilaian Nama peserta didik/kelompok Kelas Tanggal Pengumpulan
:
…………………………………………………
: ………………………………………………….
: .................................... ................................................................. .............................
No
Kategori
1.
Apakah tugas dikerjakan lengkap dan sesuaidengan tanggal pengumpulan yang telah disepakati? Apakahterdapatdaftar pustaka sumber infomasidalam penyelesaian tugas yang dikerjakan? Apakah terdapat gambar / tabel dibuat yang menarik sesuai dengan konsep? Apakahbahasa yang digunakanuntukmenginterpretasikanlugas, sederhana, runtut dan sesuaidengankaidah EYD? Apakah laporan yang dikerjakan sesuai dengan konsep yang telah dipelajari?
2.
3. 4.
5.
Skor
Alasan
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Lampiran 1: Materi Pembelajaran Pertemuan Pertemuan ke-2
Materi Pertemuan 2 I. Notasi Atom Henry Gwyn-Jeffreys Moseley (1887 – 1915) pada tahun 1913 menemukanbahwa jumlah muatan positif dalam inti atom merupakan sifat khas masing-masing unsur. Atom-atom dari unsur yang sama memiliki jumlahatom diberi lambang Z , untuk menyebutkan menyebutkan jumlah muatan positif p ositif dalam intiatom. Nomor atom unsur menunjukkan menunjukkan jumlah proton dalam inti. Setelahdilakukan Setelahdilakukan percobaan, percobaan, diketahui bahwa atom tidak bermuatan listrik yangberarti dalam atom jumlah muatan positif sama dengan jumlah muatan negatif,sehingga negatif,sehingga nomor atom juga menunjukkan jumlah elektron dalam unsur. Nomor atom ( Z Z ) = jumlah proton = jumlah elektron Selain nomor atom, ada juga yang disebut dengan nomor massa yangbiasanya diberi lambang A. Nomor massa ini digunakan untuk menentukanjumlah nukleon dalam atom suatu unsur. Nukleon unsur. Nukleon sendiri adalah partikelpenyusun inti atom yang terdiri dari proton dan neutron. A(nomor A(nomor massa) = jumlah proton (p) + jumlah j umlah neutron (n) Dalam penulisan atom, nomor massa ( A) A) ditulis di sebelah kiri atas,sedangkan nomor atom ( Z ) ditulis di sebelah kiri bawah dari lambang lambang unsur.
A
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Lampiran 2 : Kisi-kisi dan Instrumen Pertemuan ke-2 Kisi-kisi Pertemuan ke-2 Aspek : Pengetahuan P engetahuan
IPK 3.2.5 Menjelaskan nomor
Materi Pembelajaran Nomor atom
Tingkat berpikiri Low
Indikator Soal Peserta didik dapat menjelaskan
No Soal 1
Bentuk Soal PG
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Instrumen Penilaian Kognitif
Pertemuan ke-2 Pilihan Ganda 1. Pernyataan berikut ini yang benar tentang nomor atom dan nomor massa adalah .... a. Nomor atom menyatakan menyatakan jumlah neutron b. Nomor atom menyatakan menyatakan proton dan neutron c. Nomor atom lebih besar dari nomor nomor massa d. Nomor massa massa menyatakan menyatakan jumlah proton dan neutron e. Omor massa lebih kecil dari nomor atom
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b. c.
1 dan 3 2 dan 3
e.
4 dan 5
Soal uraian 1. Tentukan jumlah proton, neutron dan elektron dari unsur-unsur berikut ini. a.
23 10
Na
c.
14 7
N
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Isoton
14 7
N ,
30
P, 15
Isobar
14 7
30 15
N , P,
13 6
C
1
28
Al , 13 14 6
30 10
C
Ne
Total Skor
7
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Lampiran 3 Penilaian Sikap ( Observasi)
Format Lembar Pengamatan Perilaku Ilmiah Peserta Didik Nama Peserta Peserta Didik Didik
: .......... ................ ............ ............ ............ ............. ............ .......
Tanggal Observasi
:...................................................
No
Aspek yang yang diamati diamati
Kriteria
Hasil
Pengamatan Pengamatan
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Lampiran 4
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Lampiran 5
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4
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