Teacher: In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Question: The government of Canada is considering implementing less carbon taxes across the country. If these taxes were implemented, the amount of carbon dioxide emissions in the country would be expected to 
 Answer: rise
Solution: The carbon taxes encourage people to use less fossil fuel, which reduces carbon dioxide emissions.
Reason: As mentioned in the input Question and Answer, the output statement constructs the explanation correctly. By decreasing the taxes, carbon dioxide emissions will rise, so the explanation is correct. 

Now, solve this instance: Question: Carmen is in class mixing solutions of reactants. The first solution has a very low concentration of reactants, while the second solutions concentration of reactants is higher. The reaction rate will be higher in the 
 Answer: second solution
Student:
When the concentration of reactants is higher, the reaction rate is faster.