Which reaction would cause a decrease in entropy? A. 2CCI4(9) + O2(g) → 2C0Cl2(g) + 2Cl2(g)

B. CO(g) + 3H2(g) → CH4(9) + H2O(g)

C. 2NH3(g) → N2(g) + 3H2(g)

D. 2NOCI(g) → 2NO(g) + Cl2(g)

Which statement justifies that phosphine (ph3) is a polar molecule?

10-14. (a) when 100.0 ml of weak acid ha were titrated with 0.093 81 m naoh, 27.63 ml were required to reach the equivalence point. find the molarity of ha. (b) what is the formal concentration of a- at the equivalence point? (c) the ph at the equivalence point was 10.99. find pk. for ha. (d) what was the ph when only 19.47 ml of naoh had been added?

If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3