Ethylic alcohol - trung bình

Home Lớp 9 Khoa học tự nhiên 9 - sách kết nối tri thứcBài tập trung bình

{"common":{"save":0,"post_id":"7928","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8404","post_id":"7928","mon_id":"1159533","chapter_id":"1159574","question":"Mu\u1ed1n \u0111i\u1ec1u ch\u1ebf 100 mL ethylic alcohol 65$^0$<\/span> ta dùng:<\/p>","options":["A. <\/strong>100 mL n\u01b0\u1edbc hòa v\u1edbi có 65 mL r\u01b0\u1ee3u nguyên ch\u1ea5t","B. <\/strong>100 mL ethylic alcohol nguyên ch\u1ea5t có 65 mL n\u01b0\u1edbc","C. <\/strong>65 mL ethylic alcohol nguyên ch\u1ea5t hòa v\u1edbi 35 mL n\u01b0\u1edbc","D.<\/strong> 35 mL r\u01b0\u1ee3u nguyên ch\u1ea5t v\u1edbi 65 ml n\u01b0\u1edbc"],"correct":"3","level":"2","hint":"Xét t\u1ec9 l\u1ec7 gi\u1eefa ethylic alcohol và n\u01b0\u1edbc \u0111\u1ec3 \u0111\u1ea1t \u0111úng n\u1ed3ng \u0111\u1ed9.<\/p>","answer":"\u0110áp án \u0111úng: C. 65 mL ethylic alcohol nguyên ch\u1ea5t hòa v\u1edbi 35 mL n\u01b0\u1edbc<\/strong><\/span><\/p>\u0110\u1ed9 r\u01b0\u1ee3u \u0111\u01b0\u1ee3c xác \u0111\u1ecbnh b\u1eb1ng l\u01b0\u1ee3ng r\u01b0\u1ee3u nguyên ch\u1ea5t trong 100 mL dung d\u1ecbch. Do \u0111ó, n\u1ebfu mu\u1ed1n \u0111i\u1ec1u ch\u1ebf 100 mL dung d\u1ecbch r\u01b0\u1ee3u 65°, ta c\u1ea7n 65 mL r\u01b0\u1ee3u nguyên ch\u1ea5t<\/strong> và 35 mL n\u01b0\u1edbc<\/strong>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-06 08:53:24","option_type":"txt","len":3},{"id":"8405","post_id":"7928","mon_id":"1159533","chapter_id":"1159574","question":"Hòa tan 30 mL ethylic alcohol nguyên ch\u1ea5t vào 90 mL n\u01b0\u1edbc c\u1ea5t thu \u0111\u01b0\u1ee3c:<\/p>","options":["A. <\/strong>ethylic alcohol có \u0111\u1ed9 r\u01b0\u1ee3u là 20$^0$<\/span>","B.<\/strong> ethylic alcohol có \u0111\u1ed9 r\u01b0\u1ee3u là 25$^0$<\/span>","C.<\/strong> ethylic alcohol có \u0111\u1ed9 r\u01b0\u1ee3u là 30$^0$<\/span>","D. <\/strong>ethylic alcohol có \u0111\u1ed9 r\u01b0\u1ee3u là 35$^0$<\/span>"],"correct":"2","level":"2","hint":"\u0110\u1ed9 r\u01b0\u1ee3u<\/strong> là ph\u1ea7n tr\u0103m th\u1ec3 tích c\u1ee7a r\u01b0\u1ee3u trong dung d\u1ecbch cu\u1ed1i cùng. \u0110\u1ec3 tính \u0111\u1ed9 r\u01b0\u1ee3u, c\u1ea7n xác \u0111\u1ecbnh t\u1ed5ng th\u1ec3 tích c\u1ee7a dung d\u1ecbch và t\u1ec9 l\u1ec7 ph\u1ea7n tr\u0103m c\u1ee7a r\u01b0\u1ee3u trong \u0111ó."<\/p>","answer":"\u0110áp án \u0111úng: B. ethylic alcohol có \u0111\u1ed9 r\u01b0\u1ee3u là 25$^0$<\/span><\/strong><\/span><\/p>\u0110\u1ed9 r\u01b0\u1ee3u = ${V_{r} $V_{r} + V_{H_{2}O}})$<\/span> = 30 \/ (30 + 90) = 25$^0$<\/span><\/p>","type":"choose","extra_type":"cloud","time":"0","user_id":"127","test":"0","date":"2024-11-06 09:01:11","option_type":"math","len":0},{"id":"8406","post_id":"7928","mon_id":"1159533","chapter_id":"1159574","question":"S\u1ed1 liên k\u1ebft trong phân t\u1eed ethylic alcohol là:<\/p>","options":["A.<\/strong> 8","B.<\/strong> 7","C.<\/strong> 6","D.<\/strong> 9"],"correct":"1","level":"2","hint":"V\u1ebd c\u1ea5u trúc phân t\u1eed c\u1ee7a ethylic alcohol (C\u2082H\u2085OH) \u0111\u1ec3 xác \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng liên k\u1ebft gi\u1eefa các nguyên t\u1eed.<\/p>","answer":"\u0110áp án \u0111úng: A. 8<\/strong><\/span><\/p>- Ethylic alcohol g\u1ed3m 2 nguyên t\u1eed carbon (C), 6 nguyên t\u1eed hydrogen (H), và 1 nguyên t\u1eed oxygen (O).<\/p>- C\u1ea5u trúc liên k\u1ebft là: H\u2083C-CH\u2082-OH.<\/p>- 5 liên k\u1ebft gi\u1eefa C và H<\/strong>.<\/p>- 1 liên k\u1ebft gi\u1eefa hai nguyên t\u1eed C<\/strong>.<\/p>- 1 liên k\u1ebft gi\u1eefa C và O<\/strong>.<\/p>- 1 liên k\u1ebft gi\u1eefa O và H<\/strong>.<\/p>=> V\u1eady t\u1ed5ng s\u1ed1 liên k\u1ebft là 8.<\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"127","test":"0","date":"2024-11-06 09:03:33","option_type":"txt","len":0}]}