Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
화학 반응에서 반응물은 생성물로 변환된다.hwahak ban-eungeseo ban-eungmul-eun saengseongmul-lo byeonhwan-doenda.In a chemical reaction, the reactants are converted into products.