Uy » Online olimpiada » Kimyo olimpiada » 9-sinf Kimyo olimpiada №4 Kimyo olimpiada 9-sinf Kimyo olimpiada №4 InfoMaster Yanvar 5, 2023 663 Ko'rishlar 1 izoh SaqlashSaqlanganOlib tashlandi 2 0 12345678910111213141516171819202122232425 Vaqtingiz tugadi! 9-sinf Kimyo olimpiada №4 03.01.2023 yil oo.uzedu.uz Online olimpiada savollari! 1 / 25 226Ra izotopining yarim-yemirilish davri 1600 yil. Bu 1600 yil o‘tgach izotopning yarmi parchalanib, qolgan yarmi esa o‘zgarishsiz qolganini bildiradi. Shu muddat ichida 226Ra izotopining parchalanish tezligi qanday o‘zgaradi? reaksiya yakunlanib, tezlik 0 ga teng bo‘ladi 2 marta kamayadi 2 marta ortadi tezlik o‘zgarmaydi 2 / 25 NO va N2Ox dan iborat aralashmada kislorodning massa ulushi 40% , NO ning massa ulushi 21,4% bo’lsa, X ni toping. 2 1 5 3 3 / 25 238U → E + x β+ y 0n1. ushbu yadro reaksiyada x/y ning qiymati 0,375 ga teng bo’lsa, noma’lum element izotopini aniqlang. (x+y=11) ²³⁰Th ²³²Pa ²³⁰Ac ²⁷⁶Rn 4 / 25 Pirobelonit PbMn₂VO₄OH mineralida vanadiyning oksidlanish darajasi: +2 +5 +1 +3 5 / 25 Eng qutibli bog`: P-Cl Br-Cl N-Cl I-Cl 6 / 25 B A C D 7 / 25 D B A C 8 / 25 B D A C 9 / 25 B D C A 10 / 25 B C A D 11 / 25 D B C A 12 / 25 A D C B 13 / 25 D A B C 14 / 25 A C B D 15 / 25 C B A D 16 / 25 D C B A 17 / 25 B A C D 18 / 25 A B D C 19 / 25 A C B D 20 / 25 D B C A 21 / 25 C A B D 22 / 25 A D C B 23 / 25 D C A B 24 / 25 D C B A 25 / 25 D A B C 0% Author: InfoMaster Foydali bo'lsa mamnunmiz
