When 6.25 grams of pure iron are allowed to react with oxygen, a black oxide forms. if the product weighs 8.15g, what is the empirical formula of the oxide?

Ron and Hermione begin with 1.50 g of the hydrate copper (II) sulfate·x-hydrate (CuSO4·xH2O), where x is an integer. Part of their practical exam is to determine this integer x. They are working in pairs, though Hermione is doing most of the work.

Indicate whether the substance exists in aqueous solution (a) entirely in molecular form, (b) entirely as ions, (c) or as a mixture of molecules and ions. HF, CH3CN, NaClO4, Ba (OH) 2

What country used the most energy in world during both 1990 and 2003?

What is the difference between an extergonic reaction and it endogenic reaction?

What is the first step in replication

Does skin have a nucleus true or false

Bacteria are only found in decaying matter. A. True B. False

Which is considered a chemical mutagen? tanning beds tobacco X-rays precious metals

Combining 0.380 mol Fe2O3 with excess carbon produced 13.7 g Fe Fe2O3 + 3C → 2Fe + 3CO What is the actual yield of iron in moles? What is the theoretical yield of iron in moles? What is the percent yield?

When a hydrogen electron makes a transition from n=3 to n=1?