2When are ratios useful? Choose the best answer.

Identify the characteristics that describe how human proteins are assembled. Check all that apply.

A closed container is filled with oxygen. the pressure in the container is 225 kpa. what is the pressure in millimeters of mercury?

Which pure substance is made of only one kind of atom? A. An element B. Am electron C. A particle D. A proton

Is Naci a metal or none metel

For which substance does (triangle) Hf = 0 A. H2O (l) B. C (s, diamond) C. O3 (g) D. Br2 (l)

Why does bromine not react with sulphur?

What happens to the size of the atom of anon-metal as it becomes an anion? A. it decreases B. it increases C. it remains the same D. it is impossible to tell unless you know the specific element

How is oxygen and nitrogen alike

Does a gas discharge tube filled with boron emit the same wavelength

a certain solution has a molarity of m = 6.39 mol/l and has a volume of v = 0.550 l what is the value of n