A.Synthesis of water by passing electric sparks through a mixture of hydrogen and oxygen
B.Neutralization of a dilute alkali solution by a small amount of a conentrated acid
C.Hydrolysis of an ester in the presence of H+
D.Darkening of silver halides in light
A.they are exothermic reactions
B.they are endothermic reactions
C.the energy of the reacting molecules exceeds the activation energy by absorption of light
D.they are reversible reactions
A.that every two hours one reactor volume of feed at specified conditions is being treated by the reactor
B.that two reactor volumes of feed at specified conditions are bing fed into the reactor per hour
C.that the actual reactor volume is double that of the optimum reactor volume
D.that one-half reactor volume of feed at specified conditions are being fed into the reactor.
A.increases the equiliibrium concentration of the product
B.changes the equilibrium constant of the reaction
C.shortens the time to reach equilibrium
D.suppliies energy to the reaction.
A.Temperature
B.Concentration of reactants
C.Catalyst
D.Number of molecules of reactants taking part in a reaction.
A.heat of reaction
B.heat of formation of the product
C.activation energy
D.equilibrium constant.
A.decreases the activation energy
B.alters the reaction mechanism
C.increases the frequency of collisions of reacting species
D.all of these answers.
A.depends on the unit of time
B.has units of reciprocal time
C.does not change on changing the concentration units
D.all of the above
A.law of gaseous volumes
B.law of Avogadro
C.law of constant proportions
D.law of conservation of mass
A.thermo-nuclear reaction
B.endothermic reaction
C.exothermic reaction
D.photochemical reaction
