Chem Reaction Rate Quiz

Which term refers to the speed at which reactants are converted into products? (A)reaction rate (B)activation energy (C)meta stable state (D)spontaneous reaction

(A)reaction rate

Magnesium oxide does not readily decompose into magnesium and oxygen. The reaction is shown below. MgO(s) + 601.7 kJ mc017-1.jpg Mg(s) + ½O2(g) Which factor plays the most important role in allowing this reaction to occur? (A)temperature (B)concentration (C)pressure (D)surface area

(A)temperature

The diagram below shows the movement of particles. mc002-1.jpg What does this piece of evidence best support? (A)the collision theory (B)the Maxwell-Boltzmann distribution (C)the effect of pressure on reaction rates (D)the effect of temperature on reaction rates

(A)the collision theory

Which will cause an increase in the reaction rate between molecules? (A)Molecules have strong internal bonding. (B)Molecules collide more frequently. (C)Electrons in the bonds remain in a meta-stable state. (D)Electrons do not have enough energy to leave the bonds.

(B)Molecules collide more frequently.

Which topic is commonly used to explain activation energy and how chemical reactions happen? (A)reaction rate (B)collision theory (C)velocity distribution (D)spontaneous reaction

(B)collision theory

An increase in temperature affects the reaction rate by? (A)decreasing the velocities of particles that collide in the reaction. (B)increasing the number of molecules that have sufficient kinetic energy to react. (C)increasing the number of molecules that have sufficient potential energy to react. (D)decreasing the energy that particles need to overcome the energy activation barrier.

(B)increasing the number of molecules that have sufficient kinetic energy to react.

A change in which factor will affect the rate of reaction only when gases are involved? (A)temperature (B)pressure (C)surface area (D)concentration

(B)pressure

Which best explains why sawdust burns more quickly than a block of wood of equal mass under the same conditions? (A)The molecules move more quickly in the sawdust than in the block of wood. (B)The pressure of oxygen is greater on the sawdust. (C)More molecules in the sawdust can collide with oxygen molecules. (D)Oxygen is more concentrated near the sawdust than the block of wood.

(C)More molecules in the sawdust can collide with oxygen molecules.

The production of water proceeds according to the following equation. 2H2(g) + O2(g) mc021-1.jpg 2H2O(g) Which describes a way to speed up the collisions between hydrogen and oxygen molecules to produce more water? (A)Use a less-intense source of heat on the reactants. (B)Maintain the same temperature of the reactants. (C)Place the reactants in a smaller container. (D)Reduce the concentration of the reactants.

(C)Place the reactants in a smaller container.

Consider the reaction below. C2H4(g) + H2(g) mc030-1.jpg C2H6(g) Which change would likely cause the greatest increase in the rate of the reaction? (A)decrease temperature and decrease pressure (B)increase temperature and decrease pressure (C)decrease temperature and increase pressure (D)increase temperature and increase pressure

(D)increase temperature and increase pressure