
Sains KSSM Tingkatan 5 : Bab 4 Kadar Tindakbalas (sub 4.1))
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Sains KSSM Tingkatan 5 : Bab 4 Kadar Tindakbalas (sub 4.1)
Fokus Bab ...pengenalan kadar tindak balas, faktor yg mempengaruhi kadar tindakbalas dan aplikasi kadar tindakbalas
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Pengenalan kadar tindak balas
Tindak balas terbahagi kepada dua iaitu tindak balas cepat dan tindak balas perlahan
Tindak balas cepat (tindakbalas kimia dlm masa singkat)
Tindak balas perlahan (tindakbalas kimia dlm masa yg panjang)
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Contoh tindak balas cepat
pembakaran bahan api
pemendakan plumbum (II) iodida
menggoreng telur
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Contoh tindak balas perlahan
pengaratan besi
fotosintesis
pembentukan starlaktit dan starlagmit (di gua batu kapur)
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Kadar tindak balas ialah
pengukuran perubahan kuantiti bahan tindak balas per unit masa
Atau
perubahan kuantiti hasil tindak balas per unit masa
#boleh hafal mana-mana satu....
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Kadar tindak balas berkadar songsang dengan masa
JIka kadar tindak balas tinggi, maka masa yg diambil singkat
JIka kadar tindak balas rendah, maka masa yg diambil lama
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Apabila tindakbalas berlaku...2 perubahan ketara akan berlaku....
1. KUANTITI bahan tindak balas berKURANG ..
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Apabila tindakbalas berlaku...2 perubahan ketara akan berlaku....
2. HASIL bahan tindak balas berTAMBAH...
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Menentukan kadar tindak balas
jisim bahan/ hasil
pembentukan mendakan
isipadu gas terbebas
suhu
tekanan
keamatan warna campuran
PH campuran
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contoh 1 : Perubahan jisim tindak balas/ hasil
tindakbalas pepejal zink dan asid sulfurik .. akan menghasilkan larutan zink sulfat dan gas hidrigen dibebaskan
makin banyak gas higrogen terbebas, makin berkurang jisim bahan di dalam kelalang kon
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contoh 2 : Pertambahan isipadu gas terbebas
tindakbalas kalsium karbonat dengan asid hidroklorik menghasilkan gas karbon dioksida
makin bertambah masa, cebisan kalsium karbonat makin berkurang...dan gas CO2 dibebaskan
Gas yg terkumpul di ukur menggunakan picagari gas
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contoh 3 : Pembentukan mendakan
tindakbalas yg mengasilkan mendakan sebagai cth...ialah Tindak balas natrium tiosulfat dan asid hidrklorik cair
apabila masa bertambah, maka lebih banyak mendakan kuning sulfur terbentuk....
Sains KSSM Tingkatan 5 : Bab 4 Kadar Tindakbalas (sub 4.1)
Fokus Bab ...pengenalan kadar tindak balas, faktor yg mempengaruhi kadar tindakbalas dan aplikasi kadar tindakbalas
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