A compound is when two or more elements are joined together. The compound that is created with two hydrogens and one oxygen is h2o or water.
Answer:
Diboron tetrachloride ---> B2Cl4
<span>N2, penta means 5, so 5 oxygens
so with that being said n205</span>
Answer: The density of the object will be 
Explanation:
Density is defined as the mass contained per unit volume.

Given : Mass of object = 19.6 grams
Volume of object= 
Putting in the values we get:

Thus density of the object will be 
I think the correct answer would be D. The reaction that involves an acid and a covalent base would be the reaction of sulfuric acid and water or H2SO4 + 2H2O → 2H3O+ + SO42– . The acid would be H2SO4 and the covalent base would be H2O since it is being held by covalent bonds and when in solution it will have equal amounts of OH- and H+ ions.