Clicker Questions to be used during classroom discussion and DCI activity.

1. Which of the following best represents the balanced chemical equation for the reaction in the today's BCE?

A. G + B --> BG

B. G + 2B --> GB₂

C. G₂ + B ---> G₂B

D. 2G ---> G₂

E. 2G + B ---> G₂B

F. G + GB --->G₂B

2. Which of the following collisions result in the formation G₂B?

A. G + B

B. 2G + B

C. G₂ + B

D. BG + G

E. BG + G₂

F. G + G

3. What collision(s) is(are) required to convert reactants to products:

A. G + G and G₂ + B

B. G + G + B

C. GB + B

D. B + B and G + G and G₂ + B₂

E. B + G and BG + G

4. Which of the following is the best mechanism to describe the reaction 2G + B --> G₂B.

A. Step 1: G + G + B ---> G₂B

B. Step 1: G + B ---> GB / Step 2: GB + G ---> G₂B

C. Step 1: B + B ---> B₂ / Step 2: G + G ---> G₂ /Step 3: B₂ + G₂ ---> G₂B + B

D. Step 1: G + G ---> G₂ / Step 2: G₂ + B ---> G₂B

E. Step 1: B + G ---> BG / Step 2: G + G ---> G₂ /Step 3: BG + G₂ ---> G₂B + G

5. Given the following mechanism

Step 1: NO₂ ---> NO + O

Step 2: O + NO₂ ---> O₂ + NO

Write the overall reaction given a proposed mechanism for the reaction.

A. NO₂ --> NO + O

B. NO₂ --> N + O₂

C. 2NO₂ --> 2NO + O₂

D. 2NO₂ + O --> 2NO + 3/2O₂

E. NO₂ + O ---> NO + O₂

6. Identify the intermediate(s) in the mechanism for Question 5

A. NO and O

B. O₂

C. NO

D. O

E. NO and O₂

F. NO₃

7. A reasonable mechanism for the reaction

NO₂ + CO ---> NO + CO₂

is

A. Step 1: NO₂ + CO ---> NO + CO₂

B. Step 1: 2NO₂ ---> NO + NO₃ / Step 2: NO₃ + CO ---> NO + CO₂

C. Step 1: NO₂ + NO₂ + CO ---> CO₂ + NO₃ / Step 2: NO₃ ---> NO + O

D. Both A and B

E. Both B and C

F. A, B and C

Teaching Notes:

Question 1 looks for the student group responses from Question 1 on the DCI.

Question 2 looks for a slightly different response to the Question 2 on the DCI.

Question 7 will lead to the importance of experimental data for supporting a proposed mechanism.