2 revised 1 / 3 D - 125% + lo CHEM 102 Review Sheet for Exam 2 1. Use the table of data shown below to calculate the average rate of reaction bety Time (s) [A] mol/L (a) 6 x 10-3 0 0.20 5 0.14 (b) 8 x 10-3 10 0.10 15 0.071 (c) 5 x 10-3 20 0.050 (d) 200 2. Consider the following reaction. 3A + 2B The rate of disappearance of A is gi The rate of appearance of B in terms of the rate of disappearance of A is given by: (a) 2Δ[Α]/3Δt (b) -2Δ[Α]/3Δt (c) -3Δ[Α]/2Δt (d) -A[A 3. The table shown below contains concentration and rate data for this reaction. A-

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

the answer is 75.0%.