It is difficult to imagine our life without shopping. On one hand, it’s one of quite important household tasks. Moreover, shopping is the way to get necessary food and clothes. So, if you don’t do it you can’t have all things which make your life so comfortable.
On the other hand, it’s believed that for the vast majority of people going shopping is not just duty or necessity but a real pleasure. As far as I know there is so called shopping therapy that helps people to reduce stress buying different goods or even just going window shopping.
As for me, I don’t belong to such group of people. Shopping doesn’t make me happy and sometimes it can even become a nightmare. When I can’t find things which I need, I can get annoyed and even stressed. Thus, I go shopping only when I don’t have any other choices. I usually go to a supermarket to buy some food once or twice a week. There is a huge shopping center near my house, so I can buy everything I need in one place. From time to time when I need something urgently I can look in a local shop nearby. I normally go shopping alone, that’s why I can do it quickly and effectively. I always make a shopping list before going.
Nowadays it’s becoming more and more popular to shop online. I’m firmly convinced that it’s the most comfortable way. You just surf the Internet and look through the enormous range of goods. Moreover, you can compare prices and find a real bargain. Also, you can have your purchases delivered. It’s amazingly easy and saves a lot of time and energy.
Thus, if you’re not a fan of shopping like me, do it online.
У кислотных оксидов такие св-ва: 1) взаимодействуют с водой (образ. к-та) CO2 + H2O = H2CO3 2) взаимод. с щелочами (образ соль и вода) CO2 + Ba(OH)3 = BaCo3 + H2O 3) взаимод. с основным оксидами (образ. соль) Co2 + CaO = CaCO3 4) Взаимод-ют с солями летучей к-ты. (затрудняюсь с примером) 5) Взаимод. с амфотерными оксидами (образ. средняя соль). zno + co2= znco3
а) CaO Неорганические вещ-ва -> сложные -> оксиды -> Основные.
Гидратация (образ. основание)
СаO + H2O → Са(OH)2
Основные оксиды взаимодействуют с кислотами, образуя соответствующие соли:
CaO + 2HCl → CaCl2 + H2O
К образованию солей также приводит реакция основных оксидов с кислотными оксидами: СаO + CO2 → СаCO3
1) H3PO4+3NaOH=Na3PO4+3H2O фосфат натрия 2) H3PO4+NaOH=NaH2PO4+H2O дигирофосфат натрия 3) H3PO4+2NaOH=Na2HPO4+2H2O гирофосфатнатрия Теперь можно вести расчет. В первом случаи: Найдем какое вещество в избытке, какое в недостатке: 19,6/98=0,2 (моль) 10/40=0,25 (моль) NaOH - в избытке, ведем расчет по недостатку, то есть по H3PO4. 1) H3PO4+3NaOH=Na3PO4+3H2O H3PO4-0,2 моль Na3PO4-х моль По уравнению х = 0,2 моль M (Na3PO4) = 0,2*164=32,8 По аналогии решаем следующее 2) H3PO4+NaOH=NaH2PO4+H2O Н3РО4-0,2 моль NaH2PO4-х моль х=0,2 моль m (NaH2PO4)=0,2*120=24 г 3) H3PO4+2NaOH=Na2HPO4+2H2O
Н3РО4-0,2 моль Na2HPO4-х моль х=0,2 моль m (Na2HPO4)=0,2*142=28,4г Как то так...
It is difficult to imagine our life without shopping. On one hand, it’s one of quite important household tasks. Moreover, shopping is the way to get necessary food and clothes. So, if you don’t do it you can’t have all things which make your life so comfortable.
On the other hand, it’s believed that for the vast majority of people going shopping is not just duty or necessity but a real pleasure. As far as I know there is so called shopping therapy that helps people to reduce stress buying different goods or even just going window shopping.
As for me, I don’t belong to such group of people. Shopping doesn’t make me happy and sometimes it can even become a nightmare. When I can’t find things which I need, I can get annoyed and even stressed. Thus, I go shopping only when I don’t have any other choices. I usually go to a supermarket to buy some food once or twice a week. There is a huge shopping center near my house, so I can buy everything I need in one place. From time to time when I need something urgently I can look in a local shop nearby. I normally go shopping alone, that’s why I can do it quickly and effectively. I always make a shopping list before going.
Nowadays it’s becoming more and more popular to shop online. I’m firmly convinced that it’s the most comfortable way. You just surf the Internet and look through the enormous range of goods. Moreover, you can compare prices and find a real bargain. Also, you can have your purchases delivered. It’s amazingly easy and saves a lot of time and energy.
Thus, if you’re not a fan of shopping like me, do it online.