A food chain is

a. All the biotic interactions
b. All the feeding relationships in the ecosystem
c. The link between abiotic and biotic factors
D. The single sequence of organisms feeding

TWO examples of abiotic factors needed in an ecosystem are
a. Air and water
b. Food and air
c. Air and plants
d. Food and water

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?