4. (10 Points) What is Hess' Law and what is its significance in working with chemical reactions?

What is important to study for nios grade 12 chemistry? i have only one month left.

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

Calculate - analysis of compound composed of iron and oxygen yields 174.86 of fe and 75.14g of o. what is the empirical formula for this compound?