Which equation represents a change that results in an increase in disorder? (1 ) i2(s)=> i2(g)
(2) co2(g) => co2(s)(3) 2na(s) + cl2(g) => 2nacl(s)
(4) 2h2(g) + o2(g) => 2h2o(l)

For which one of the following reactions is the value of δh° rxn equal to δh° f for the product? a. 2 h2 (g) + o2 (g) → 2 h2o (l) b. n2 (g) + o2 (g) → 2 no (g) c. 2 h2 (g) + o2 (g) → 2 h2o (g) d. h2o (l) + 1/2 o2 (g) → h2o2 (l) e. none of the above

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li