Which is the correct chemical formula for hydrogen gas?

A.
H2O

B.
OH

C.
H3

D.
H2
I'm sorry to do this in the math section but no one is helping me in chem

Question

Which is the correct chemical formula for hydrogen gas?	
 
 A.
H2O
 
 B.
OH
 
 C.
H3
 
 D.
H2
I'm sorry to do this in the math section but no one is helping me in chem

anonymous · Answer

D

bossimbacon · Answer

thank you @MARC_  can you help me with a couple more

bossimbacon · Answer

or na

bossimbacon · Answer

Which is a description of a precipitation reaction?	
 
 A.
Sulfuric acid combines with sodium hydroxide to produce water and sodium sulfate.
 
 B.
Water decomposes to form hydrogen and oxygen.
 
 C.
Potassium iodide is added to lead nitrate to produce an insoluble yellow solid, lead iodide.
 
 D.
Lead combines with oxygen to produce lead oxide.

anonymous · Answer

I say C.

anonymous · Answer

A precipitation reaction is when two aqueous material form a ionic insoluble solid. ( If they are a cations and anions )