Final answer:
After another 3 seconds, the reaction rate is expected to be lower due to the decrease in reactant concentration, while the concentration of products would be higher as more product is formed.
Step-by-step explanation:
The question seeks to understand the expected change in the rate of reaction and concentration of products after an additional 3 seconds in a chemical reaction where the rate of reaction after the first 3 seconds was 1.8 x 10⁻¶ M/s. From the information provided, we can determine that as time progresses, the concentration of reactants typically decreases, which consequently leads to a decrease in the reaction rate, as less reactant is available to form the products.
Furthermore, the concentration of products, on the other hand, would be expected to increase as more products are formed from the reactants. Therefore, after another 3 seconds, it would be expected that the rate would be lower, and the concentration of products would be higher.