Bài 1. Có 30g dung dịch NaCl 20%. Tính nồng độ % dung dịch thu được khi a. Pha thêm 20g H2O
b. Cô đặc dung dịch để chỉ còn 25g.

What type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? view available hint(s) what type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? salt bridge disulfide bridge hydrogen bond hydrophobic interaction

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron