What factors are used to determine whether a bond will be polar or nonpolar? and what factors are used to determine whether a molecule will be polar or nonpolar?

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?

Which quote from the passage best illustrates della’s optimism? “…and at length she was able to look up with dim eyes and a smile and say: "my hair grows so fast, jim! ” “…her heart had simply craved and yearned over them without the least hope of possession.” “and now, they were hers, but the tresses that should have adorned the coveted adornments were gone.” “beautiful combs, pure tortoise shell, with jewelled rims--just the shade to wear in the beautiful vanished hair.”d, ardent, most likely means? gloomy calm passionate innocent

Which of the following factors does not affect soil formation? a. precipitation b. time c. erosion d. none of the above