![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/bai-7-thuc-hanh-quan-sat-cac-dang-dot-bien-so-luong-nhiem-sat-the-sgk-sinh-12.png\")
<\/p>\nI. N\u1ed9i dung th\u1ef1c h\u00e0nh<\/b><\/p>\n
1. Quan s\u00e1t c\u00e1c d\u1ea1ng \u0111\u1ed9t bi\u1ebfn s\u1ed1 l\u01b0\u1ee3ng NST tr\u00ean ti\u00eau b\u1ea3n c\u1ed1 \u0111\u1ecbnh<\/i><\/p>\n
– \u0110\u1eb7t ti\u00eau b\u1ea3n l\u00ean k\u00ednh hi\u1ec3n vi<\/p>\n
– Quan s\u00e1t to\u00e0n b\u1ed9 ti\u00eau b\u1ea3n \u1edf d\u01b0\u1edbi v\u1eadt k\u00ednh 10\u00d7 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed c\u1ee7a nh\u1eefng t\u1ebf b\u00e0o \u0111\u00e3 nh\u00ecn th\u1ea5y NST.<\/p>\n
– Ch\u1ec9nh v\u00e0o v\u00f9ng c\u00f3 nhi\u1ec1u t\u1ebf b\u00e0o v\u00e0 chuy\u1ec3n sang quan s\u00e1t \u1edf v\u1eadt k\u00ednh 40\u00d7.<\/p>\n
2. L\u00e0m ti\u00eau b\u1ea3n t\u1ea1m th\u1eddi v\u00e0 quan s\u00e1t NST.<\/i><\/p>\n
L\u00e0m ti\u00eau b\u1ea3n c\u1ee7a tinh ho\u00e0n ch\u00e2u ch\u1ea5u \u0111\u1ef1c:<\/p>\n
– D\u00f9ng k\u00e9o c\u1eaft b\u1ecf c\u00e1nh, ch\u00e2n c\u1ee7a ch\u00e2u ch\u1ea5u.<\/p>\n
– Tay tr\u00e1i c\u1ea7m ph\u1ea7n \u0111\u1ea7u ng\u1ef1c, tay ph\u1ea3i k\u00e9o ph\u1ea7n b\u1ee5ng ra s\u1ebd th\u1ea5y 1 s\u1ed1 n\u1ed9i quan trong \u0111\u00f3 c\u00f3 tinh ho\u00e0n.<\/p>\n
– \u0110\u01b0a tinh ho\u00e0n l\u00ean phi\u1ebfn k\u00ednh, nh\u1ecf v\u00e0i gi\u1ecdt n\u01b0\u1edbc c\u1ea5t.<\/p>\n
– D\u00f9ng kim m\u1ed5 t\u00e1ch m\u1ee1 xung quanh tinh ho\u00e0n.<\/p>\n
– Nh\u1ecf v\u00e0i gi\u1ecdt oocxein axetic l\u00ean tinh ho\u00e0n \u0111\u1ec3 nhu\u1ed9m trong th\u1eddi gian t\u1eeb 15 \u2013 20 ph\u00fat.<\/p>\n
– \u0110\u1eady l\u00e1 k\u00ednh, d\u00f9ng ng\u00f3n tay \u1ea5n nh\u1eb9 l\u00ean m\u1eb7t l\u00e1 k\u00ednh cho t\u1ebf b\u00e0o d\u00e0n \u0111\u1ec1u v\u00e0 l\u00e0m v\u1ee1 t\u1ebf b\u00e0o \u0111\u1ec3 NST tung ra.<\/p>\n
– \u0110\u01b0a ti\u00eau b\u1ea3n l\u00ean k\u00ednh quan s\u00e1t.<\/p>\n
– \u0110\u1ebfm s\u1ed1 l\u01b0\u1ee3ng v\u00e0 quan s\u00e1t h\u00ecnh th\u00e1i c\u1ee7a t\u1eebng NST.<\/p>\n
II. K\u1ebft qu\u1ea3 quan s\u00e1t<\/b><\/p>\n
<\/p>\n
\u0110\u1ed9t bi\u1ebfn s\u1ed1 l\u01b0\u1ee3ng NST \u1edf r\u1ec5 h\u00e0nh (4n)<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/bai-7-thuc-hanh-quan-sat-cac-dang-dot-bien-so-luong-nhiem-sat-the-sgk-sinh-12-1.png\")
<\/p>\n
NST \u1edf tinh ho\u00e0n ch\u00e2u ch\u1ea5u \u0111\u1ef1c<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
I. N\u1ed9i dung th\u1ef1c h\u00e0nh 1. Quan s\u00e1t c\u00e1c d\u1ea1ng \u0111\u1ed9t bi\u1ebfn s\u1ed1 l\u01b0\u1ee3ng NST tr\u00ean ti\u00eau b\u1ea3n c\u1ed1 \u0111\u1ecbnh – \u0110\u1eb7t ti\u00eau b\u1ea3n l\u00ean k\u00ednh hi\u1ec3n vi – Quan s\u00e1t to\u00e0n b\u1ed9 ti\u00eau b\u1ea3n \u1edf d\u01b0\u1edbi v\u1eadt k\u00ednh 10\u00d7 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed c\u1ee7a nh\u1eefng t\u1ebf b\u00e0o \u0111\u00e3 nh\u00ecn th\u1ea5y NST. – Ch\u1ec9nh […]<\/p>\n","protected":false},"author":3,"featured_media":22859,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1307],"tags":[1397,1398],"yoast_head":"\n