Sự nở vì nhiệt

Home Lớp 8 Khoa học tự nhiên 8 - sách Kết nối tri thức Bài 29: Sự nở vì nhiệtBài tập trung bình

{"common":{"save":0,"post_id":"9269","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9887","post_id":"9269","mon_id":"1159539","chapter_id":"1160023","question":"T\u1ea1i sao nhi\u1ec7t k\u1ebf r\u01b0\u1ee3u l\u1ea1i dùng r\u01b0\u1ee3u thay vì dùng n\u01b0\u1edbc?<\/p>","options":["A. Vì r\u01b0\u1ee3u trong h\u01a1n n\u01b0\u1edbc","B. Vì r\u01b0\u1ee3u d\u1ec5 bay h\u01a1i h\u01a1n","C. Vì r\u01b0\u1ee3u có màu \u0111\u1eb9p","D. Vì r\u01b0\u1ee3u n\u1edf vì nhi\u1ec7t nhi\u1ec1u h\u01a1n n\u01b0\u1edbc"],"correct":"4","level":"2","hint":"Nhi\u1ec7t k\u1ebf c\u1ea7n ch\u1ea5t l\u1ecfng có \u0111\u1ed9 n\u1edf cao \u0111\u1ec3 d\u1ec5 \u0111o.<\/p>","answer":"\u0110áp án \u0111úng là: D. Vì r\u01b0\u1ee3u n\u1edf vì nhi\u1ec7t nhi\u1ec1u h\u01a1n n\u01b0\u1edbc<\/strong> Gi\u1ea3i thích:<\/strong><\/p>R\u01b0\u1ee3u có h\u1ec7 s\u1ed1 n\u1edf vì nhi\u1ec7t l\u1edbn h\u01a1n n\u01b0\u1edbc → d\u1ec5 quan sát m\u1ee9c r\u01b0\u1ee3u thay \u0111\u1ed5i khi nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-05-15 23:20:58","option_type":"txt","len":3},{"id":"9888","post_id":"9269","mon_id":"1159539","chapter_id":"1160023","question":"Vì sao trong nhi\u1ec7t k\u1ebf th\u1ee7y ngân, c\u1ed9t th\u1ee7y ngân l\u1ea1i t\u1ee5t xu\u1ed1ng khi nhi\u1ec7t \u0111\u1ed9 môi tr\u01b0\u1eddng gi\u1ea3m?<\/p>","options":["A. Vì th\u1ee7y ngân b\u1ed1c h\u01a1i","B. Vì th\u1ee7y ngân \u0111ông \u0111\u1eb7c","C. Vì th\u1ee7y ngân co l\u1ea1i khi nhi\u1ec7t \u0111\u1ed9 gi\u1ea3m","D. Vì \u1ed1ng th\u1ee7y tinh n\u1edf ra"],"correct":"3","level":"2","hint":"Phân tích m\u1ed1i liên h\u1ec7 gi\u1eefa nhi\u1ec7t \u0111\u1ed9 và th\u1ec3 tích ch\u1ea5t l\u1ecfng.<\/p>","answer":"\u0110áp án \u0111úng là: C. Vì th\u1ee7y ngân co l\u1ea1i khi nhi\u1ec7t \u0111\u1ed9 gi\u1ea3m<\/strong> Gi\u1ea3i thích:<\/strong><\/p>Khi nhi\u1ec7t \u0111\u1ed9 gi\u1ea3m, th\u1ee7y ngân co l\u1ea1i → th\u1ec3 tích gi\u1ea3m → m\u1ee9c th\u1ee7y ngân t\u1ee5t xu\u1ed1ng.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-05-15 23:21:36","option_type":"txt","len":3},{"id":"9889","post_id":"9269","mon_id":"1159539","chapter_id":"1160023","question":"Khi \u0111un nóng m\u1ed9t l\u01b0\u1ee3ng ch\u1ea5t l\u1ecfng trong \u1ed1ng nghi\u1ec7m, ch\u1ea5t l\u1ecfng tràn ra ngoài. \u0110i\u1ec1u này là do:<\/p>","options":["A. Ch\u1ea5t l\u1ecfng bay h\u01a1i m\u1ea1nh","B. Ch\u1ea5t l\u1ecfng b\u1ed1c cháy","C. Ch\u1ea5t l\u1ecfng n\u1edf vì nhi\u1ec7t","D. \u1ed0ng nghi\u1ec7m n\u1edf vì nhi\u1ec7t nhi\u1ec1u h\u01a1n"],"correct":"3","level":"2","hint":"Liên h\u1ec7 gi\u1eefa th\u1ec3 tích ch\u1ea5t và nhi\u1ec7t \u0111\u1ed9.<\/p>","answer":"\u0110áp án \u0111úng là: C. Ch\u1ea5t l\u1ecfng n\u1edf vì nhi\u1ec7t<\/strong> Gi\u1ea3i thích:<\/strong><\/p>Khi b\u1ecb nung nóng, ch\u1ea5t l\u1ecfng n\u1edf ra → th\u1ec3 tích t\u0103ng → tràn kh\u1ecfi \u1ed1ng.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-05-15 23:22:23","option_type":"txt","len":2}]}