A student determined that 2.5 grams of methane, CH4, produced 139kJ of heat in a bomb calorimeter. What is AErxn for the combustion of methane in kJ/mole CH4? Enter text here

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 bromine are needed to produce 3.23 moles of potassium bromide

What is the mass of naoh that would have to be added to 500 ml of a solution of 0.20 m acetic acid in order to achieve a ph of 5.0?