CO2 + Ba(OH)2 = BaCO3↓ + H2O 

уравнение реакций полная и краткая форма! помогите!

Как решить (19 целых 5 девятых) в квадрате самым рациональным способом?

на карте составленной в масштабе 1 :10000 расстояние между деревнями 4 см. каково расстояние между деревнями в действительности?

Дать ответы на вопросы к тексту.

Dear Kelly, I was at the circus on Sunday. It was very interesting! There were two funny clowns. Their noses were red and their hair was orange. There were many animals too. I was happy! Where were you on Sunday? Love, Mary.

Вопросы:

1) Where was Mary on Sunday?

2) How many clowns were there?

3) What colour were the clown's noses?

4) What colour were the clown's hair?

5) Who was happy?