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Perubahan kimia adalah suatu perubahan zat yang bersifat kekal, karena zat tersebut benar-benar berubah menjadi zat baru. Selanjutnya perubahan kimia dikenal sebagai reaksi kimia. Walaupun zat yang bereaksi (reaktan) telah berubah menjadi zat baru (produk), namun massa zat sebelum dan sesudah reaksi ...

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