Amino acid và peptide

Home Lớp 12 Hoá học Lớp 12 - Sách KNTT Bài 9: Amino acid và peptideBài tập trung bình

{"common":{"save":0,"post_id":"10109","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9177","post_id":"10109","mon_id":"1160346","chapter_id":"1160215","question":"\u0110\u1ec3 ph\u1ea3n \u1ee9ng hoàn toàn v\u1edbi dung d\u1ecbch ch\u1ee9a 7,5 gam H\u2082NCH\u2082COOH c\u1ea7n v\u1eeba \u0111\u1ee7 V<\/strong> mL dung d\u1ecbch NaOH 1 M. Giá tr\u1ecb c\u1ee7a V<\/strong> là:<\/p>","options":["A. 100 \n ","B. 200 \n ","C. 50","D. 150"],"correct":"3","level":"2","hint":"G\u1ee3i ý: Xác \u0111\u1ecbnh s\u1ed1 mol c\u1ee7a amino axit và t\u1ec9 l\u1ec7 ph\u1ea3n \u1ee9ng gi\u1eefa nhóm –COOH v\u1edbi NaOH.<\/p>","answer":"\u0110áp án \u0111úng: C. 50<\/span><\/strong><\/p>Gi\u1ea3i thích:<\/strong> Glyxin (H\u2082NCH\u2082COOH) có 1 nhóm –COOH, ph\u1ea3n \u1ee9ng v\u1edbi NaOH theo t\u1ec9 l\u1ec7 mol 1 : 1. S\u1ed1 mol glyxin = 7,5 \/ 75 = 0,1 mol. → S\u1ed1 mol NaOH c\u1ea7n = 0,1 mol. V = n \/ CM = 0,1 \/ 1 = 0,1 L = 50 mL.<\/strong><\/p>A sai: 100 mL t\u01b0\u01a1ng \u1ee9ng v\u1edbi 0,1 mol glyxin có 2 nhóm –COOH, trong khi glyxin ch\u1ec9 có 1. B sai: 200 mL là g\u1ea5p \u0111ôi l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft. D sai: 150 mL không phù h\u1ee3p v\u1edbi t\u1ec9 l\u1ec7 ph\u1ea3n \u1ee9ng 1 : 1.<\/p>","type":"choose","extra_type":"classic","user_id":"139","test":"0","date":"2025-10-21 15:52:17","option_type":"txt","len":0},{"id":"9178","post_id":"10109","mon_id":"1160346","chapter_id":"1160215","question":"Cho 2,25 gam H\u2082NCH\u2082COOH tác d\u1ee5ng h\u1ebft v\u1edbi dung d\u1ecbch NaOH, thu \u0111\u01b0\u1ee3c dung d\u1ecbch ch\u1ee9a m<\/strong> gam mu\u1ed1i. Giá tr\u1ecb c\u1ee7a m<\/strong> là:<\/p>","options":["A. 2,91 \n ","B. 3,39 \n ","C. 2,85","D. 3,42"],"correct":"2","level":"2","hint":"G\u1ee3i ý: Vi\u1ebft ph\u01b0\u01a1ng trình ph\u1ea3n \u1ee9ng gi\u1eefa amino axit và NaOH, sau \u0111ó tính kh\u1ed1i l\u01b0\u1ee3ng mu\u1ed1i t\u1ea1o thành t\u1eeb s\u1ed1 mol ban \u0111\u1ea7u.<\/p>","answer":"\u0110áp án \u0111úng: B. 3,39<\/span><\/strong><\/p>Gi\u1ea3i thích:<\/strong> Ph\u01b0\u01a1ng trình ph\u1ea3n \u1ee9ng: H\u2082NCH\u2082COOH + NaOH → H\u2082NCH\u2082COONa + H\u2082O<\/p>S\u1ed1 mol glyxin = 2,25 \/ 75 = 0,03 mol. ⇒ S\u1ed1 mol mu\u1ed1i t\u1ea1o thành = 0,03 mol. Kh\u1ed1i l\u01b0\u1ee3ng mu\u1ed1i H\u2082NCH\u2082COONa = 0,03 × 113 = 3,39 gam.<\/strong><\/p>A sai: 2,91 gam t\u01b0\u01a1ng \u1ee9ng v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng n\u1ebfu ph\u1ea3n \u1ee9ng ch\u01b0a hoàn toàn. C sai: 2,85 gam là giá tr\u1ecb sai do nh\u1ea7m công th\u1ee9c mu\u1ed1i. D sai: 3,42 gam l\u1edbn h\u01a1n giá tr\u1ecb th\u1ef1c, có th\u1ec3 do làm tròn sai.<\/p>","type":"choose","extra_type":"classic","user_id":"139","test":"0","date":"2025-10-21 15:57:06","option_type":"txt","len":0},{"id":"9179","post_id":"10109","mon_id":"1160346","chapter_id":"1160215","question":"Phát bi\u1ec3u nào sau \u0111ây \u0111úng?<\/p>","options":["A. Phân t\u1eed glutamic acid có hai nguyên t\u1eed oxygen.","B. Aniline tác d\u1ee5ng v\u1edbi n\u01b0\u1edbc bromine t\u1ea1o k\u1ebft t\u1ee7a.","C. \u1ede \u0111i\u1ec1u ki\u1ec7n th\u01b0\u1eddng, glycine là ch\u1ea5t l\u1ecfng.","D. Phân t\u1eed Gly-Ala có m\u1ed9t nguyên t\u1eed nitrogen."],"correct":"2","level":"2","hint":"G\u1ee3i ý: Xem l\u1ea1i \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u t\u1ea1o c\u1ee7a amino axit và amin th\u01a1m \u0111\u1ec3 xác \u0111\u1ecbnh ch\u1ea5t nào ph\u1ea3n \u1ee9ng v\u1edbi brom, và tr\u1ea1ng thái v\u1eadt lý c\u1ee7a glyxin.<\/p>","answer":"\u0110áp án \u0111úng: B. Aniline tác d\u1ee5ng v\u1edbi n\u01b0\u1edbc bromine t\u1ea1o k\u1ebft t\u1ee7a.<\/span><\/strong><\/p>Gi\u1ea3i thích:<\/strong> Anilin (C\u2086H\u2085NH\u2082) tác d\u1ee5ng v\u1edbi n\u01b0\u1edbc brom t\u1ea1o k\u1ebft t\u1ee7a tr\u1eafng 2,4,6-tribromoanilin → ph\u1ea3n \u1ee9ng \u0111\u1eb7c tr\u01b0ng c\u1ee7a anilin.<\/p>A sai: Glutamic acid (HOOC–CH\u2082–CH\u2082–CH(NH\u2082)–COOH) có 4 nguyên t\u1eed oxygen<\/strong>, không ph\u1ea3i 2. C sai: Glycine (H\u2082NCH\u2082COOH) là ch\u1ea5t r\u1eafn tinh th\u1ec3 màu tr\u1eafng<\/strong>, không ph\u1ea3i ch\u1ea5t l\u1ecfng. D sai: Dipeptit Gly–Ala có 2 nguyên t\u1eed nitrogen<\/strong> (m\u1ed7i amino axit góp 1 N, liên k\u1ebft peptit không làm m\u1ea5t nguyên t\u1eed N nào).<\/p>","type":"choose","extra_type":"classic","user_id":"139","test":"0","date":"2025-10-21 16:00:53","option_type":"txt","len":3}]}