Вот держи хотя бы 2 а 5 я не знаю
Pb (NO3)2 - формула нитрат свинца(||) формула
My family is very cool.
My mother's name is (имя). She is forty years old. Mum has got long dark hair and green eyes. She
isn't tall, but she is very nice.
My dad's name is (имя). He is forty seven years old. He has got short dark hair and gray eyes. He is tall.
I love my family!
А) Оксид серы
SO2+H20=H2SO3
(может идити обратная реакция)