ответ: 1. there is a big tree in the garden. 2. there is a bank
near here. - where is bank? 3. there is a new
supermarket in the center of our town. 4. there is a hotel
over there. hotel isn't cheap. 5. where is the cat?
cat is on the sofa. 6. where is the book? - book is on the
shelf. 7. where are the flowers? - flowers are in a
beautiful vase. 8. where is the vase? - the vase is on a little table near the window. 9. open the window, please. the weather is fine today. i can see
sun in the sky, i can see a nice little bird. bird is
sitting on a big tree. the tree is green. 10. there is a
little white cloud in the sky. 11. we have a large room.
there is a big sofa in the room and a little lamp on
wall over the sofa. i like to sit on the sofa and read a good book.
объяснение:
думаю так, но всё равно проверь
ответ:
ну смотри
объяснение:
вот пример и ответ
вычислить константу диссоциации уксусной кислоты в 0,01 н. растворе, в котором степень диссоциации кислоты равна 4,2%.
ответ:
cн3соон = сн3соо(-) + н(+)
концентрация ионов водорода и ацетат ионо равны: [сн3соо(-)] = [н(+)]
концентрация кислоты равна [cн3соон] = c-[н(+)] = 0,01-[н(+)]
степень диссоциации равна: а = [н(+)]*100/с, отсюда [н(+)] = а*с/100
константа диссоциации равна:
кд = [сн3соо(-(+)]/[cн3соон] = [н(+/(0,01-[н(+ = (а*с/100)^2/(0,01-a*c/100) = (4,2*0,01/100)^2/(0,01-4,2*0,01/100) = 1,84*10^-5
