Use the following equation for the combustion of methane to answer the following questions:
CH4 + 2O2 -> CO2 +2 H2O ΔH = -900 kJ
a. Is the reaction exothermic or endothermic?

b. If you burn 2 moles of methane, how much energy is released?

c. If you burn 48 g of methane, how much energy is released?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Select the most likely product for this reaction: koh(aq) + co2(g) – ? k2co3(aq) + h2o(1) k(s) + h2(g) + o2(g) k(s) + co3(9) +h2

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.