распределите вещества , формулы которых приведены ниже,по группам в зависимости от pH их растворов: Сa(OH)2, H2O, HCl, NaCl, KNO3, NaOH, H3PO4, KOH, H2SO4

1) группа рН=7,среда нейтральная

2) группа рН>7,среда щелочная

3) группа рН<7, кислотная среда

 

помогите пожалуйста!

1 переведите предложения, подчеркните в них сказуемое:

if the weather is bad on saturday, we will not go to the country.

a friend of mine Rob Jenkins went to see a doctor.

there are four places at the table.

2 переведите текст

oxford

oxford is like London: it is international, it is very old and it has great charm. it is also a town that grew up near the river thames. oxford os international because people from many parts of the world come to study at its university. they come to study at one of the twenty-seven men's colleges or at one of the five women's colleges that are the university: they join the university "family" that has more than 9000 members. oxford is old and historical. it has existed since 912. the university was established in 1249. the oldest of the twenty-seven men's colleges is university college. you can see the charm of oxford in the green fields and parks which surround the city and you can see it in the lawns and gardens which surround the colleges. you can see the chain of oxford in the river thames and its streams which pass near the city. do you know that the name oxford means the part of the river thames where the oxen (cattle) forder (crossed)?

3 ответьте на вопросы:

why is oxford international?

when was the oxford university established?

what is the origin of the name oxford?

-4/5а+1+5/6а=1/2а-2/5

Какие условия существования необходимы для жизнедеятельности животных????