Question

what do the following represent(write about each)
a) H,H2,2H
b)Ca&CO
c)S&Si
d) S&S8​

Answer 1

Answer:

Any H attached to an electronegative atom can behave as acidic hydrogen. In addition to that, we can use following general rule: 

Acidic Strength: Alkane  < alkene < NH3 < Alkyne < alcohol < Water < Phenol < Nitrophenol < H2CO3 < RCOOH < Benzoic acid < HCOOH < Picric Acid.

As only acetylene has acidic hydrogen ion (H+), so it will evolve hydrogen gas with Na.

Answer 2

Answer:

a.H is the formula of hydrogen

H2 is the molecular formula of hydrogen

2H means there will be2separate moles of element

b.ca is the formula of calcium

co is theformula of carbon monoxide

c.s is the formula of sulfur

si is the formula of silicon

d. s is the formula of sulfur

s8 is the one common molecular formula for sulfur