{"common":{"save":0,"post_id":"8174","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9155","post_id":"8174","mon_id":"1159533","chapter_id":"1159588","question":"<p>Các tr\u1ecb s\u1ed1 30; 40 trên xi m\u0103ng , ví d\u1ee5: PCB: 30; PCB: 40... ch\u1ec9 \u0111i\u1ec1u gì?<\/p>","options":["<strong>A. <\/strong>% t\u1ec9 l\u1ec7 tr\u1ed9n xi m\u0103ng","<strong>B.<\/strong> % CaO trong xi m\u0103ng","<strong>C. <\/strong>Cân n\u1eb7ng c\u1ee7a bao xi m\u0103ng","<strong>D.<\/strong> gi\u1edbi h\u1ea1n c\u01b0\u1eddng \u0111\u1ed9 nén c\u1ee7a xi m\u0103ng sau 28 ngày"],"correct":"4","level":"2","hint":"<p>Hãy chú ý \u0111\u1ebfn ý ngh\u0129a c\u1ee7a các con s\u1ed1 \u0111\u01b0\u1ee3c ghi sau ký hi\u1ec7u PCB. Chúng liên quan \u0111\u1ebfn m\u1ed9t \u0111\u1eb7c tính quan tr\u1ecdng c\u1ee7a xi m\u0103ng khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong xây d\u1ef1ng, \u0111\u1eb7c bi\u1ec7t là sau m\u1ed9t kho\u1ea3ng th\u1eddi gian c\u1ed1 \u0111\u1ecbnh.<\/p>","answer":"<p>\u0110áp án \u0111úng: <span style=\"color:#16a085;\"><strong>D. gi\u1edbi h\u1ea1n c\u01b0\u1eddng \u0111\u1ed9 nén c\u1ee7a xi m\u0103ng sau 28 ngày<\/strong><\/span><\/p><p>Tr\u1ecb s\u1ed1 "30" ho\u1eb7c "40" trên bao xi m\u0103ng (ví d\u1ee5: PCB30, PCB40) bi\u1ec3u th\u1ecb c\u01b0\u1eddng \u0111\u1ed9 nén t\u1ed1i thi\u1ec3u c\u1ee7a m\u1eabu xi m\u0103ng (\u0111\u01b0\u1ee3c \u0111o b\u1eb1ng N\/mm² ho\u1eb7c MPa) sau 28 ngày. \u0110ây là m\u1ed9t thông s\u1ed1 quan tr\u1ecdng trong vi\u1ec7c \u0111ánh giá ch\u1ea5t l\u01b0\u1ee3ng xi m\u0103ng, \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ef1c c\u1ee7a công trình. "PCB" ch\u1ec9 lo\u1ea1i xi m\u0103ng Poóc l\u0103ng h\u1ed7n h\u1ee3p, trong \u0111ó các ch\u1ec9 s\u1ed1 sau ph\u1ea3n ánh kh\u1ea3 n\u0103ng ch\u1ecbu nén.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-12-18 23:26:10","option_type":"txt","len":3},{"id":"9156","post_id":"8174","mon_id":"1159533","chapter_id":"1159588","question":"<p>M\u1ed9t lo\u1ea1i th\u1ee7y tinh ch\u1ecbu l\u1ef1c ch\u1ee9a 13% Na<span class=\"math-tex\">$_{2}$<\/span>O; 11,7% CaO và 75,3% SiO<span class=\"math-tex\">$_{2}$<\/span> theo kh\u1ed1i l\u01b0\u1ee3ng. Thành ph\u1ea7n c\u1ee7a lo\u1ea1i th\u1ee7y tinh này bi\u1ec3u di\u1ec5n d\u01b0\u1edbi d\u1ea1ng các oxide là:<\/p>","options":["<strong>A. <\/strong>Na<span class=\"math-tex\">$_{2}$<\/span>O.CaO.6SiO<span class=\"math-tex\">$_{2}$<\/span>","<strong>B. <\/strong>Na<span class=\"math-tex\">$_{2}$<\/span>O.6CaO.SiO<span class=\"math-tex\">$_{2}$<\/span>","<strong>C. <\/strong>6Na<span class=\"math-tex\">$_{2}$<\/span>O.CaO.SiO<span class=\"math-tex\">$_{2}$<\/span>","<strong>D. <\/strong>3Na<span class=\"math-tex\">$_{2}$<\/span>O.CaO.6SiO<span class=\"math-tex\">$_{2}$<\/span>"],"correct":"1","level":"2","hint":"<p>Hãy tính toán t\u1ec9 l\u1ec7 mol c\u1ee7a t\u1eebng thành ph\u1ea7n trong h\u1ed7n h\u1ee3p d\u1ef1a trên ph\u1ea7n tr\u0103m kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a Na\u2082O, CaO và SiO\u2082. Sau \u0111ó, tìm t\u1ec9 l\u1ec7 nguyên t\u1eed \u0111\u01a1n gi\u1ea3n nh\u1ea5t \u0111\u1ec3 bi\u1ec3u di\u1ec5n công th\u1ee9c c\u1ee7a lo\u1ea1i th\u1ee7y tinh này.<\/p>","answer":"<p>\u0110áp án \u0111úng: <span style=\"color:#16a085;\"><strong>A. Na<span class=\"math-tex\">$_{2}$<\/span>O.CaO.6SiO<span class=\"math-tex\">$_{2}$<\/span><\/strong><\/span><\/p><p>T\u1ef7 l\u1ec7 s\u1ed1 mol c\u1ee7a các oxit: nNa<span class=\"math-tex\">$_{2}$<\/span>O : nCaO : nSiO<span class=\"math-tex\">$_{2}$<\/span> = 13\/62 = 11,7\/56 = 75,3\/60 = 0,21 : 0,21 : 1,255 = 1:1:6<\/p><p>V\u1eady công th\u1ee9c c\u1ee7a lo\u1ea1i th\u1ee7y tinh này: Na<span class=\"math-tex\">$_{2}$<\/span>O.CaO.6SiO<span class=\"math-tex\">$_{2}$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-12-18 23:28:43","option_type":"math","len":0},{"id":"9157","post_id":"8174","mon_id":"1159533","chapter_id":"1159588","question":"<p>\u1ede n\u01b0\u1edbc ta, các dãy núi \u0111á vôi t\u1eadp trung \u1edf:<\/p>","options":["<strong>A. <\/strong>B\u1eafc B\u1ed9","<strong>B. <\/strong>Nam B\u1ed9","<strong>C. <\/strong>Trung B\u1ed9","<strong>D. <\/strong>Tây Nguyên"],"correct":"1","level":"2","hint":"<p>Các dãy núi \u0111á vôi th\u01b0\u1eddng t\u1eadp trung \u1edf nh\u1eefng khu v\u1ef1c có \u0111i\u1ec1u ki\u1ec7n \u0111\u1ecba hình và khí h\u1eadu phù h\u1ee3p \u0111\u1ec3 hình thành hang \u0111\u1ed9ng, thung l\u0169ng karst. Khu v\u1ef1c này c\u0169ng có nhi\u1ec1u danh lam th\u1eafng c\u1ea3nh n\u1ed5i ti\u1ebfng nh\u01b0 Tam C\u1ed1c, Bích \u0110\u1ed9ng.<\/p>","answer":"<p>\u0110áp án \u0111úng: <span style=\"color:#16a085;\"><strong>A. B\u1eafc B\u1ed9<\/strong><\/span><\/p><p>\u1ede Vi\u1ec7t Nam, các dãy núi \u0111á vôi t\u1eadp trung ch\u1ee7 y\u1ebfu \u1edf vùng B\u1eafc B\u1ed9, \u0111\u1eb7c bi\u1ec7t là \u1edf các t\u1ec9nh nh\u01b0 Ninh Bình, Hà Nam, Hòa Bình, và khu v\u1ef1c phía B\u1eafc Tây B\u1eafc. \u0110ây là n\u01a1i có \u0111\u1ecba hình \u0111\u1eb7c tr\u01b0ng, t\u1ea1o ra nhi\u1ec1u hang \u0111\u1ed9ng và danh lam th\u1eafng c\u1ea3nh n\u1ed5i ti\u1ebfng. Trong khi \u0111ó, Nam B\u1ed9, Trung B\u1ed9, và Tây Nguyên ít ho\u1eb7c không có s\u1ef1 phân b\u1ed1 núi \u0111á vôi do \u0111\u1eb7c \u0111i\u1ec3m \u0111\u1ecba ch\u1ea5t khác bi\u1ec7t.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-12-18 23:29:49","option_type":"txt","len":2}]}