The diagram below shows a body of water below Earth's surface. The three wells shown below, provide water for a growing city. What is the most likely effect on the system if six new wells are brought into production as the city’s population increases?

the limestone layer will collapse
the shale layer will shrink
the aquifer will increase in volume
the water table will drop

How many moles of al3+ ions are in 1.25 moles of al2o3

The combustion of methane, ch4, releases 890.4kj/mol. that is, when one mole of methane is burned,890.4 kj are given off to the surroundings. this meansthat the products have 890.4 kj less than the reactants.thus, ah for the reaction = - 890.4 kj. a negative symbolforah indicates an exothermic reaction.ch (g) + 20 (g)> co2 (g) + 2 h0 (1); ah = - 890.4 kga) how much energy is given off when 2.00 mol of ch,are burned? b) how much energy is released when 22.4g of ch. areburned?

Is cutting your nails a physical or chemical change