Joe and his dad build a campfire out of 5 kilograms of wood. After the fire, there is a 1-kilogram log remaining. According to the law of conservation of mass, what is the mass of the ash and gases that resulted from the fire?

Ateacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and ph indicator strips, which measure acidity. the teacher asks the students to put the liquids in order from most acidic to most basic. what type of investigation could the students conduct to determine the correct order for the liquids?