Which element has 1 valence electron in its outer shell and will react with a group 17 element in a li ratio?
A. Chlorine
B. Calcium
C. Boron
D, Sodium

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and explain your predictions. how does temperature affect the spontaneity of this process?

What metric units would you use to measure the thickness of a key

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?