You are given a piece of paper and a match. The paper has a mass of 2.5 g. You then light the match and light
the piece of paper on fire. After it burns, the remaining
bits of paper weigh 0.5 g. Does this demonstration
violate the conservation of mass? Explain why or why
not?

Is powdered sports drink ionic or covalent ? 10pts !

Areaction in which products can react to re-form reactants is

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.