sentence: Some extra chemicals make the rocket look better when it is launched.
sentences_before: These quickly moving gases push the rocket as they exit the motor. The oxidizer helps to add oxygen, which the fuel needs to burn. The extra chemicals can do a few things. Some can speed up the burning. Some can also make the fuel burn more completely.
sentences_after: They can add sparks and flames to liftoff. They can also add smoke when the rocket flies.
concept_name: extra chemical
headings: Rocket candy Components
categories: Fuel Rockets