Questions

Explanations

(1) Both electronegativity and atomic radius increase.

(2) Both electronegativity and atomic radius decrease.

(3) Electronegativity increases and atomic radius decreases.

(4) Electronegativity decreases and atomic radius increases.

37 What is the percent composition by mass of  nitrogen in (NH₄)₂CO₃ (gram-formula mass =96.0 g/mol)?

(1)  14.6%  (2)  29.2%   (3)  58.4%   (4)  87.5%

           2KI   +  F₂  ==> 2KF   +  I₂

What type of chemical reaction does this equation represent?

(1) synthesis

(2)  decomposition

(3)  single replacement

(4)  double replacement

The graph shows that the reaction is at equilibrium after 60. seconds because the concentrations of both NO₂(g) and N₂O₄(g) are

(1) increasing    (3) constant

(2) decreasing   (4) zero

Concentrations are constant

or Rates are equal

@ equailibirium