instruction:
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.
question:
Question: Mike is watching how particles of reactants function, and sees that they are very far apart. Considering that the concentration of them is very low, the chance of them colliding together is 
 Answer: low
answer:
At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.


question:
Question: To get the fastest reaction, raise the temperature of the reactants 
 Answer: higher or
answer:
When the temperature of reactants is higher, the rate of the reaction is faster.


question:
Question: If Mona has filled a balloon with helium and she removes some gas from it, what happens to the likelihood that the helium particles will collide with each other? 
 Answer: less likely
answer:

At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.