B\u00e0i 2 (trang 44 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0N\u00eau nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m v\u1ec1 c\u1ea5u tr\u00fac c\u1ee7a amilozo , amilopectin v\u00e0 s\u1ef1 li\u00ean quan gi\u1eefa c\u1ea5u tr\u00fac v\u1edbi t\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc c\u1ee7a tinh b\u1ed9t<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Tinh b\u1ed9t l\u00e0 h\u1ed7n h\u1ee3p c\u1ee7a hai lo\u1ea1i polisaccarit : amiloz\u01a1 v\u00e0 amilopectin, trong \u0111\u00f3 amiloz\u01a1 chi\u1ebfm 20 \u2013 30 % kh\u1ed1i l\u01b0\u1ee3ng tinh b\u1ed9t<\/p>\n
a) Ph\u00e2n t\u1eed amiloz\u01a1<\/p>\n
– C\u00e1c g\u1ed1c \u03b1 \u2013 glucoz\u01a1 li\u00ean k\u1ebft v\u1edbi nhau b\u1eb1ng li\u00ean k\u1ebft \u03b1 \u2013 1,4 \u2013 glicozit t\u1ea1o th\u00e0nh m\u1ea1ch kh\u00f4ng ph\u00e2n nh\u00e1nh<\/p>\n
– Ph\u00e2n t\u1eed amiloz\u01a1 kh\u00f4ng du\u1ed7i th\u1eb3ng m\u00e0 xo\u1eafn l\u1ea1i th\u00e0nh h\u00ecnh l\u00f2 xo. M\u1ed7i v\u00f2ng xo\u1eafn g\u1ed3m 6 g\u1ed1c glucoz\u01a1<\/p>\n
b) Ph\u00e2n t\u1eed amilopectin<\/p>\n
– C\u00e1c g\u1ed1c \u03b1 \u2013 glucoz\u01a1 li\u00ean k\u1ebft v\u1edbi nhau b\u1eb1ng 2 lo\u1ea1i li\u00ean k\u1ebft:<\/p>\n
+ Li\u00ean k\u1ebft \u03b1 \u2013 1,4 \u2013 glicozit \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t chu\u1ed7i d\u00e0i (20 \u2013 30 m\u1eaft x\u00edch \u03b1 \u2013 glucoz\u01a1)<\/p>\n
+ Li\u00ean k\u1ebft \u03b1 \u2013 1,6 \u2013 glicozit \u0111\u1ec3 t\u1ea1o nh\u00e1nh<\/p>\n
B\u00e0i 3 (trang 44 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0Vi\u1ebft ph\u01b0\u01a1ng tr\u00ecnh h\u00f3a h\u1ecdc theo s\u01a1 \u0111\u1ed3 t\u1ea1o th\u00e0nh v\u00e0 chuy\u1ec3n h\u00f3a tinh b\u1ed9t sau \u0111\u00e2y:<\/strong><\/p>\nCO2<\/sub>\u00a0(1)<\/sup>\u2192 (C6<\/sub>H10<\/sub>O5<\/sub>)n\u00a0(2)<\/sup>\u2192 C12<\/sub>H22<\/sub>O11<\/sub>\u00a0(3)<\/sup>\u2192 C6<\/sub>H12<\/sub>O6<\/sub>\u00a0(4)<\/sup>\u2192 C2<\/sub>H5<\/sub>OH<\/strong><\/p>\nGiai \u0111o\u1ea1n n\u00e0o c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c nh\u1edd x\u00fac t\u00e1c axit?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/bai-3-trang-44-sgk-hoa-12-nang-cao.png\")
<\/p>\n
Giai \u0111o\u1ea1n (2) v\u00e0 (3) c\u00f3 th\u1ec3 d\u00f9ng x\u00fac t\u00e1c axit (H+<\/sup>)<\/p>\n\n
\n
B\u00e0i 4 (trang 44 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0Gi\u1ea3i th\u00edch c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng sau:<\/strong><\/p>\na. Khi \u0103n c\u01a1m, n\u1ebfu nhai k\u0129 s\u1ebd th\u1ea5y v\u1ecb ng\u1ecdt<\/strong><\/p>\nb. Mi\u1ebfng c\u01a1m v\u00e0ng ch\u00e1y \u1edf \u0111\u00e1y n\u1ed3i h\u01a1i ng\u1ecdt h\u01a1n c\u01a1m \u1edf ph\u00eda tr\u00ean<\/strong><\/p>\nc. Nh\u1ecf v\u00e0i dung d\u1ecbch I2<\/sub>\u00a0v\u00e0o m\u1eb7t m\u1edbi c\u1eaft c\u1ee7a qu\u1ea3 chu\u1ed1i xanh th\u1ea5y c\u00f3 m\u00e0u xanh l\u00e1 nh\u01b0ng v\u00e0o m\u1eb7t m\u1edbi c\u1eaft c\u1ee7a qu\u1ea3 chu\u1ed1i ch\u00edn th\u00ec kh\u00f4ng th\u1ea5y chuy\u1ec3n m\u00e0u<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
a. Khi ta nhai k\u0129 th\u1ea5y c\u01a1m c\u00f3 v\u1ecb ng\u1ecdt do trong qu\u00e1 tr\u00ecnh nhai, men amilaza c\u00f3 trong n\u01b0\u1edbc b\u1ecdt th\u1ee7y ph\u00e2n tinh b\u1ed9t th\u00e0nh dextrin r\u1ed3i th\u00e0nh mantozo<\/p>\n
b. Mi\u1ebfng c\u01a1m ch\u00e1y c\u00f3 th\u00e0nh ph\u1ea7n dextrin nhi\u1ec1u h\u01a1n mi\u1ebfng c\u01a1m ph\u00eda tr\u00ean<\/p>\n
c. Chu\u1ed1i xanh c\u00f3 ch\u1ee9a tinh b\u1ed9t c\u00f2n khi chu\u1ed1i ch\u00edn tinh b\u1ed9t \u0111\u00e3 b\u1ecb chuy\u1ec3n th\u00e0nh glucozo. \u0110\u00f3 l\u00e0 nguy\u00ean nh\u00e2n t\u1ea1i sao khi nh\u1ecf iot v\u00e0o m\u1eb7t c\u1eaft qu\u1ea3 chu\u1ed1i xanh th\u1ea5y m\u00e0u xanh lam<\/p>\n
B\u00e0i 5 (trang 44 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0T\u1eeb 10 kg g\u1ea1o n\u1ebfp c\u1ea9m ( c\u00f3 80% tinh b\u1ed9t), khi l\u00ean men s\u1ebd thu \u0111\u01b0\u1ee3c bao nhi\u00eau l\u00edt ancol etylic nguy\u00ean ch\u1ea5t? Bi\u1ebft r\u1eb1ng hi\u1ec7u su\u1ea5t c\u1ee7a qu\u00e1 tr\u00ecnh l\u00ean men \u0111\u1ea1t 80% v\u00e0 ancol etylic nguy\u00ean ch\u1ea5t c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang D = 0,789 g\/ml<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
mtinh b\u1ed9t<\/sub>\u00a0= 10.80:100 = 8 (kg)<\/p>\nS\u01a1 \u0111\u1ed3 qu\u00e1 tr\u00ecnh l\u00ean men :<\/p>\n
(C6<\/sub>H10<\/sub>O5<\/sub>)n<\/sub>\u00a0\u2192 nC6<\/sub>H12<\/sub>O6<\/sub>\u00a0\u2192 \u2192 2n C2<\/sub>H5<\/sub>OH<\/p>\nDo H = 80% => mancol etylic<\/sub>\u00a0= [(8 x 92n):162n].80:100<\/p>\nM\u1eb7t kh\u00e1c ancol etylic c\u00f3 D = 0,789 g\/ml = 0,789 kg\/l\u00edt<\/p>\n
=> Vancol etylic<\/sub>\u00a0= [(8 x 92n):162n].(80:100).(1:0,789) \u2248 4,607 l\u00edt<\/p>\nCh\u00fa \u00fd : Ch\u1ec9 l\u00e0m tr\u00f2n s\u1ed1 \u1edf ph\u00e9p t\u00ednh cu\u1ed1i c\u00f9ng<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 44 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0Gi\u1eefa tinh b\u1ed9t, saccarozo, glucozo c\u00f3 \u0111i\u1ec3m chung l\u00e0 : A. ch\u00fang thu\u1ed9c lo\u1ea1i cacbohidrat B. \u0110\u1ec1u t\u00e1c d\u1ee5ng \u0111\u01b0\u1ee3c v\u1edbi Cu(OH)2\u00a0cho dung d\u1ecbch xanh lam C. \u0110\u1ec1u b\u1ecb th\u1ee7y ph\u00e2n b\u1edfi dung d\u1ecbch axit D. \u0110\u1ec1u kh\u00f4ng c\u00f3 ph\u1ea3n \u1ee9ng tr\u00e1ng b\u1ea1c L\u1eddi gi\u1ea3i: \u0110\u00e1p \u00e1n […]<\/p>\n","protected":false},"author":3,"featured_media":25443,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1306],"tags":[1436,1435],"yoast_head":"\n
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