What do you mix with sanitizer to make it stronger?

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?