C. boiling point
boiling point is the temperature at which all liquids change from liquid to gas
Answer:
H₂Se
Explanation:
A way of estimating the acidity of a weak acid is by analizing the<em> stability of the formed anion</em>. In this case, we should find a Group 6A element that in its anionic forms (HX⁻ and X⁻²) is more stable than HS⁻ and S⁻², thus it would be more acidic in aqueous solution.
The anionic forms of Se are more stable than the forms of S, similarly to how Br⁻ is more stable than Cl⁻.
The solution for the question is the following:
NaCO3(aq) + CaCl2 (aq) --> CaCO3 + Na2Cl(aq)
Na 2+(aq) + CO3 -2 (aq) +Ca+(aq) + 2Cl-(aq) ---> CaCO3 + Na 2+(aq) + 2Cl-(aq)
Ca2+ (aq) + CO3 2- (aq) → CaCO3 (s) would be the balanced net ionic equation.
