1. (a) Determine the adiabatic flame temperature for constant-pressure combustion of a stoichiometric ethane-air mixture assuming reactants at 298 K, no dissociation of the products, and constant specific heats evaluated at 298 K. (b) Determine the adiabatic flame temperature for constant-volume combustion of a stoichiometric ethane-air mixture assuming reactants at 298 K, no dissociation of the products, and constant specific heats evaluated at 298 K. Also, determine the final pressure.

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answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e