Bella wants to know which mode of transportation is the fastest for getting from her home to the grocery store. She can drive her car, ride her bike, walk, or charter a helicopter. Experiment:

Independent Variable:

Dependent Variable:

Controlled Variable:

Hypothesis:

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

How do you know when a chemical reaction has occurred

Match each statement with the state of matter it describes