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A chemist measures a reaction rate as mol L . Express this rate in molecules (molecules per cubic centimeter per microsecond). Avogadro's number = molecules/mol.
molecules
molecules
molecules
molecules
A chemical equilibrium is established when:
All reactants are consumed.
The rate of the forward reaction is equal to the rate of the reverse reaction.
The concentration of reactants is equal to the concentration of products.
The temperature of the system reaches room temperature.
In the autocatalytic decomposition of hydrogen peroxide, the rate of decomposition of :
Decreases continuously
Increases continuously
Remains constant
Increases initially and then decreases
A scientist is studying the kinetic isotope effect in a reaction involving deuterium. They find that the rate constant for the reaction with heavy water () is significantly smaller than that with normal water (). This difference is primarily attributed to the:
Higher viscosity of compared to .
Difference in zero-point vibrational energies of the O-H and O-D bonds.
Greater dielectric constant of compared to .
Difference in the nuclear spins of deuterium and hydrogen.
Which of the following alkenes exhibits the highest rate of reaction with HCl in an electrophilic addition reaction under standard conditions?
Ethene
Propene
2-Methylpropene
2,3-Dimethyl-2-butene
Two molecules A and B collide, but no reaction occurs. Which of the following MUST be true?
The molecules did not collide with the correct orientation.
The molecules are not reactive under any conditions.
The collision did not have sufficient energy to overcome the activation energy barrier.
The temperature of the system is too low for any reaction to occur.
According to collision theory, which factor does NOT significantly affect the rate of a reaction?
The orientation of the colliding molecules
The kinetic energy of the colliding molecules
The frequency of collisions between molecules
The size of the reaction vessel
Increasing the temperature of a reaction generally increases the reaction rate. Which aspect of collision theory best explains this observation?
Increased temperature reduces the activation energy of the reaction.
Increased temperature changes the orientation of the colliding molecules.
Increased temperature decreases the frequency of collisions between molecules.
Increased kinetic energy of molecules leads to more collisions exceeding the activation energy.
Which statement best describes the relationship between activation energy and reaction rate?
Reactions with higher activation energies generally proceed faster.
Activation energy has no effect on reaction rate.
The relationship between activation energy and reaction rate is unpredictable.
Reactions with lower activation energies generally proceed faster.
Consider two reactions, A and B. Reaction A has a higher activation energy than reaction B. Which statement is most likely true?
Reaction A will proceed faster than reaction B at the same temperature.
Both reactions will proceed at the same rate at the same temperature.
Reaction B will proceed faster than reaction A at the same temperature.
The relative rates of reactions A and B cannot be predicted based on activation energy alone.
