Chemical Kinetics and Stoichiometry

The video tutorial by Eric Kim covers Skills Practice 42 on rates. It begins with an introduction to a chemical equation involving HSO3-, IO3-, HSO4-, and I-. The tutorial explains how to calculate moles at different time intervals and determine the rate of formation and disappearance of substances. It includes detailed steps for calculating the average rate of formation of I- over various time intervals and uses stoichiometry to finalize rate calculations. The tutorial emphasizes understanding the relationship between changes in moles and rates of reaction.

What is the initial chemical equation discussed in the video?

• HSO3- + IO3- → HSO4- + I-

• 3 HSO3- + IO3- → 3 HSO4- + I-

• 4 HSO3- + IO3- → 4 HSO4- + I-

• 2 HSO3- + IO3- → 2 HSO4- + I-

What is the volume of the container used in the calculations?

• 0.50 L

• 0.45 L

• 0.40 L

• 0.55 L

How do you calculate the moles of HSO4- at 200 seconds?

• Multiply the change in I- by 2 and add to HSO4-

• Multiply the change in I- by 4 and add to HSO4-

• Multiply the change in I- by 3 and add to HSO4-

• Multiply the change in I- by 1 and add to HSO4-

What is the average rate of formation of I- between 0 to 200 seconds?

• 7.78 * 10^6 mity per second

• 1.22 * 10^5 mity per second

• 2.33 * 10^5 mity per second

• 3.33 * 10^5 mity per second

How is the average rate of formation of I- calculated?

• By dividing the change in moles by the time interval

• By subtracting the change in moles from the time interval

• By multiplying the change in moles by the time interval

• By adding the change in moles to the time interval

What happens to the rate of formation of I- as time progresses?

• It decreases

• It remains constant

• It fluctuates

• It increases

What is the rate of disappearance of HSO3- given in the video?

• 0.50 mity per second

• 0.40 mity per second

• 0.45 mity per second

• 0.35 mity per second

How is the rate of appearance of I- calculated from the rate of disappearance of HSO3-?

• By using a 2:3 stoichiometric ratio

• By using a 1:3 stoichiometric ratio

• By using a 1:2 stoichiometric ratio

• By using a 1:1 stoichiometric ratio

What is the final calculated rate of appearance of I-?

• 0.010 mity per second

• 0.025 mity per second

• 0.020 mity per second

• 0.015 mity per second

What is the stoichiometric ratio of I- to HSO3- in the reaction?

• 1:2

• 2:3

• 1:1

• 1:3