Question 1

Which of the following does not influence the speed of a chemical reaction?

Accepted Answer

The molecular mass of the reactants does not have any direct impact on the speed of a chemical reaction, as it only affects the stoichiometry (molar ratios) of the reactants and products. The other factors listed (concentration of the reactants, surface area of solid reactants, and temperature) all have a significant impact on the reaction rate.

Question 2

Which of the following is not a term involved in determining the overall rate of a chemical reaction?

Accepted Answer

While the total number of collisions is a factor in determining the rate of a chemical reaction, the other three choices (energy of collisions, favorable orientation, and collisions per unit time) are also important factors. The phase of the reaction (gas, liquid, or solid) does not play a direct role in determining the overall rate.

Question 3

Which of the following can be done to increase the likelihood that a chemical reaction will take place?

Accepted Answer

Increasing the number of collisions between reacting molecules will increase the likelihood of a chemical reaction taking place. This can be achieved through various methods such as increasing the concentration of reactants, increasing the temperature, or adding a catalyst. Decreasing the average speed of reacting molecules or breaking the reaction up into steps may slow down the reaction but not necessarily increase the likelihood of it taking place. Removing all the water from the reaction mixture may prevent certain reactions from occurring but it does not increase the overall likelihood of a chemical reaction taking place.

Question 4

The rate of reaction: A (g)+ 3B (g)→ C (g)+ 2D (g)is Rate = -k[A][B]³. If the concentration of B is doubled while that of A is unchanged, the rate will ________.

Accepted Answer

The rate law is Rate = k[A][B]^3. If [B] is doubled, the rate becomes k[A](2[B])^3 = 8k[A][B]^3, increasing the rate by a factor of 8.

Question 5

The rate of a reaction is proportional to ________.

Accepted Answer

All three factors mentioned (number of collisions, energy of collisions, and orientation of collisions) can affect the rate of a reaction. Therefore, the rate is proportional to all three of these factors, making choice D the best answer.

Question 6

Which of the following is an exothermic reaction?

Accepted Answer

All of the options listed involve the release of heat energy, which is the definition of an exothermic reaction.

Question 7

Consider the reaction X → Y with the following data: Energy of reactants = 50 kJ/mole;
Energy of reaction = -30 kJ/mole;
Energy of transition state = 90 kJ/mole.
The energy of products for the reaction is ________ kJ/mole.

Accepted Answer

The energy of products can be calculated using the formula: 
Energy of products = Energy of reactants + Energy of reaction 
Energy of products = 50 kJ/mol + (-30 kJ/mol) = 20 kJ/mol
Therefore, the answer is B.

Question 8

-In the diagram above, the two containers shown (Box A and BoxB)have exactly the same size (volume), are held at the same temperature, and contain reactant molecules (dots). In which box will the rate of reaction be faster?

Accepted Answer

The answer of 
-In the diagram above, the two containers...

Question 9

Which of the following statements regarding reaction mechanisms is true?

Accepted Answer

A reaction mechanism is indeed a series of steps describing how reactants are converted to products. It is also true that reaction mechanisms are typically determined experimentally through a variety of techniques, including spectroscopy and kinetic experiments. Thus, both A and B are true statements.

Question 10

Which of the following does not affect the rate of a reaction?

Accepted Answer

Pressure does not affect the rate of a reaction unless the reaction involves gases. The concentration of the reactants, the energy of activation, and the temperature all affect the rate of a reaction.

Question 11

Consider the reaction X → Y with the following data: Energy of reactants = 25 kJ/mole;
Energy of products = 75 kJ/mole;
Energy of transition state = 100 kJ/mole.
The energy of activation for the reverse reaction is ________ kJ/mole.

Accepted Answer

The answer of Consider the reaction X → Y with...

Question 12

Which of the following is an endothermic reaction?

Accepted Answer

The answer of Which of the following is an endothermic...

Question 13

Which statement is true about the reaction energy profile?

Accepted Answer

The reaction energy profile plots the relative energies of both the reactants and products, with energy being represented on the y-axis and the progress of the reaction being traced on the x-axis. Therefore, all the options given are true.

Question 14

Which of the following responses contains the two rate factors that comprise the rate constant (k)for a given chemical reaction?

Accepted Answer

The rate constant (k) for a chemical reaction is determined by the number of collisions with energy greater than the activation energy and the fraction of collisions with a favorable orientation. These factors ensure that only effective collisions contribute to the reaction rate.

Question 15

Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole;
Energy of products = 20 kJ/mole;
Energy of transition state = 60 kJ/mole.
One can say with certainty that the reaction is ________ by ________kJ/mole and the energy of activation is ________ kJ/mole.

Accepted Answer

The reaction is exothermic because the energy of products (20 kJ/mole) is lower than the energy of reactants (30 kJ/mole). The reaction is also releasing energy by 10 kJ/mole (energy of reactants minus energy of products). The energy of activation is the difference between the energy of the transition state and the energy of the reactants (60 kJ/mole - 30 kJ/mole), which is 30 kJ/mole. Therefore, the correct choice is A.

Question 16

The units for the rate of a reaction are ________.

Accepted Answer

The rate of a reaction is defined as the change in concentration of reactants or products per unit of time. Therefore, the units for the rate of a reaction are concentration per unit of time.

Question 17

Which of the following "adjustments" can be made to a chemical reaction system to increase the rate of reaction?

Accepted Answer

Increasing the temperature and concentration of reactants can increase the rate of reaction by providing more energy and increasing the frequency of collisions between reactant molecules. Adding a catalyst can reduce the activation energy required for the reaction, also increasing the rate of reaction. Therefore, all of the choices (A, B, and C) can increase the rate of reaction.

Question 18

-In the diagram above, the containers shown (Box A and BoxB)contain exactly the same number of reactant molecules and are at the same temperature. In which box will the rate of reaction be faster?

Accepted Answer

The answer of 
-In the diagram above, the containers shown...

Question 19

Which of the following is an example of a substitution reaction?

Accepted Answer

A substitution reaction involves a functional group being replaced by another functional group. In this case, the hydroxyl group (-OH) is being replaced by a bromine atom (-Br), making it a substitution reaction. The other reactions listed are not substitution reactions - B is a combustion reaction, C is a combination reaction, and D is a displacement reaction.

Question 20

The fraction of collisions with the proper orientation depends on ________.

Accepted Answer

The fraction of collisions with the proper orientation depends on both the strength of the bonds that are to be broken and the molecular shape of the molecule.

Quiz 13: When Reactants Turn Into Products

Which of the following does not influence the speed of a chemical reaction?

Which of the following is not a term involved in determining the overall rate of a chemical reaction?

Which of the following can be done to increase the likelihood that a chemical reaction will take place?

The rate of reaction: A (g) + 3B (g) → C (g) + 2D (g) is Rate = -k[A][B]³. If the concentration of B is doubled while that of A is unchanged, the rate will ________.

The rate of a reaction is proportional to ________.

Which of the following is an exothermic reaction?

Consider the reaction X → Y with the following data: Energy of reactants = 50 kJ/mole; Energy of reaction = -30 kJ/mole; Energy of transition state = 90 kJ/mole. The energy of products for the reaction is ________ kJ/mole.

-In the diagram above, the two containers shown (Box A and BoxB) have exactly the same size (volume) , are held at the same temperature, and contain reactant molecules (dots) . In which box will the rate of reaction be faster?

Which of the following statements regarding reaction mechanisms is true?

Which of the following does not affect the rate of a reaction?

Consider the reaction X → Y with the following data: Energy of reactants = 25 kJ/mole; Energy of products = 75 kJ/mole; Energy of transition state = 100 kJ/mole. The energy of activation for the reverse reaction is ________ kJ/mole.

Which of the following is an endothermic reaction?

Which statement is true about the reaction energy profile?

Which of the following responses contains the two rate factors that comprise the rate constant (k) for a given chemical reaction?

Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole; Energy of products = 20 kJ/mole; Energy of transition state = 60 kJ/mole. One can say with certainty that the reaction is by kJ/mole and the energy of activation is kJ/mole.

The units for the rate of a reaction are ________.

Which of the following "adjustments" can be made to a chemical reaction system to increase the rate of reaction?

-In the diagram above, the containers shown (Box A and BoxB) contain exactly the same number of reactant molecules and are at the same temperature. In which box will the rate of reaction be faster?

Which of the following is an example of a substitution reaction?

The fraction of collisions with the proper orientation depends on ________.

Quiz 13: When Reactants Turn Into Products

Which of the following does not influence the speed of a chemical reaction?

Which of the following is not a term involved in determining the overall rate of a chemical reaction?

Which of the following can be done to increase the likelihood that a chemical reaction will take place?

The rate of reaction: A (g) + 3B (g) → C (g) + 2D (g) is Rate = -k[A][B]3. If the concentration of B is doubled while that of A is unchanged, the rate will ________.

The rate of a reaction is proportional to ________.

Which of the following is an exothermic reaction?

Consider the reaction X → Y with the following data: Energy of reactants = 50 kJ/mole; Energy of reaction = -30 kJ/mole; Energy of transition state = 90 kJ/mole. The energy of products for the reaction is ________ kJ/mole.

-In the diagram above, the two containers shown (Box A and BoxB) have exactly the same size (volume) , are held at the same temperature, and contain reactant molecules (dots) . In which box will the rate of reaction be faster?

Which of the following statements regarding reaction mechanisms is true?

Which of the following does not affect the rate of a reaction?

Consider the reaction X → Y with the following data: Energy of reactants = 25 kJ/mole; Energy of products = 75 kJ/mole; Energy of transition state = 100 kJ/mole. The energy of activation for the reverse reaction is ________ kJ/mole.

Which of the following is an endothermic reaction?

Which statement is true about the reaction energy profile?

Which of the following responses contains the two rate factors that comprise the rate constant (k) for a given chemical reaction?

Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole; Energy of products = 20 kJ/mole; Energy of transition state = 60 kJ/mole. One can say with certainty that the reaction is ________ by ________kJ/mole and the energy of activation is ________ kJ/mole.

The units for the rate of a reaction are ________.

Which of the following "adjustments" can be made to a chemical reaction system to increase the rate of reaction?

-In the diagram above, the containers shown (Box A and BoxB) contain exactly the same number of reactant molecules and are at the same temperature. In which box will the rate of reaction be faster?

Which of the following is an example of a substitution reaction?

The fraction of collisions with the proper orientation depends on ________.

The rate of reaction: A (g) + 3B (g) → C (g) + 2D (g) is Rate = -k[A][B]³. If the concentration of B is doubled while that of A is unchanged, the rate will ________.

Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole; Energy of products = 20 kJ/mole; Energy of transition state = 60 kJ/mole. One can say with certainty that the reaction is by kJ/mole and the energy of activation is kJ/mole.