What natural resource did the Mesopotamians use to protect their cities from floods? trees
reeds
stone walls
mud bricks

What is the number of moles in 15.0 g ash3?

Ase your answer to this question on the information below. hydrocarbons and fissionable nuclei are among the sources used for the production of energy in the united states. a chemical reaction produces much less energy than a nuclear reaction per mole of reactant. the balanced chemical equation below represents the reaction of one molecule of a hydrocarbon with two molecules of oxygen. chemical equation: ch4 + 2o2 → co2 + 2h2o + 1.48 × 10−18 jthe nuclear equation below represents one of the many possible reactions for one fissionable nucleus. in this equation, x represents a missing product. nuclear equation: write an isotopic notation for the missing product represented by x in the nuclear equation.

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen