Use the molar bond enthalpy data in the table to estimate the value of Δ∘rxn for the equation C2H4(g)+HBr(g)⟶C2H5Br(g)

In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Why do cells appear different in distilled water than they do in 10% salt water?