TASK DEFINITION: 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.
PROBLEM: Question: Quent increases the energy of a liquid. He notices that the particles in the liquid 
 Answer: speed up

SOLUTION: As the liquid particles lose energy, their movement slows down even more. As their movements become slower and slower, the attractive forces between become stronger.

PROBLEM: Question: Tina cools some oxygen gas. The oxygen particles will move 
 Answer: slower

SOLUTION: If the gas is heated, the particles will move faster as they gain more energy.

PROBLEM: Question: Carol is building a small rocket to test in her back yard and, after much consideration, decides to use a biofuel to power her rocket. She tells her friends it's because it will create _____ carbon dioxide than fossil fuels. 
 Answer: less

SOLUTION:
The advantage to biofuels is that they burn more cleanly than fossil fuels. As a result, they create less pollution and less carbon dioxide.