Which of these is most commonly found in its liquid form?
O
A. Oxygen
O
B. Water
O
C. Hydrogen
O
D. Helium

NEED ASAP!!!

Name the element in group 17, period 2. (periodic table)

The msds for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. it reacts with bases, various metals, and strong oxidizing agents. its vapors can form explosive mixtures with air.

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?