Unit 8 Quiz 1

25 July 2022
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question
A solid reactant is placed into a beaker of a warm water. The liquid vigorously bubbles as the solid dissolves into the solution. What will most likely happen if the temperature of the liquid is slightly reduced? 1. More bubbles will be produced because the solution is becoming more concentrated. 2. Fewer bubbles will be produced because of fewer collisions of reactant molecules. 3. The solid will get smaller at a faster rate because of more collisions of reactant molecules. 4. The solid will get larger at a slower rate because precipitate is coming out of the solution.
answer
Fewer bubbles will be produced because of fewer collisions of reactant molecules.
question
Consider the reaction below. COCl2(g)Ā® CO(g) + Cl2(g) What is the most likely effect to the reaction if there is an increase in pressure on this reaction? The reactant surface area increases. The reaction rate decreases. The reaction is not affected at all. The reaction stops completely.
answer
The reaction rate decreases.
question
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? Use a less-intense source of heat on the reactants. Maintain the same temperature of the reactants. Place the reactants in a smaller container. Reduce the concentration of the reactants.
answer
Place the reactants in a smaller container.
question
Which topic is commonly used to explain activation energy and how chemical reactions happen? reaction rate collision theory velocity distribution spontaneous reaction
answer
collision theory
question
Which term refers to the speed at which reactants are converted into products? reaction rate activation energy meta stable state spontaneous reaction
answer
reaction rate
question
An increase in temperature affects the reaction rate by 1. decreasing the velocities of particles that collide in the reaction. 2.increasing the number of molecules that have sufficient kinetic energy to react.. 3. increasing the number of molecules that have sufficient potential energy to react. 4. decreasing the energy that particles need to overcome the energy activation barrier.
answer
increasing the number of molecules that have sufficient kinetic energy to react.
question
Ben observes how quickly some dry wood is burning in a campfire. Which term best relates to Ben's observation? reaction rate activation energy collision theory spontaneous reaction
answer
reaction rate
question
Consider the energy diagram below. xn. mc012-1.jpg Which line indicates a higher reaction rate? A because it has a lower activation energy. B because it has a lower activation energy. A because its mc012-2.jpgGrxn is much lower. B because its mc012-3.jpgGrxn is much lower.
answer
B because it has a lower activation energy.
question
Which will cause an increase in the reaction rate between molecules? Molecules have strong internal bonding. Molecules collide more frequently. Electrons in the bonds remain in a meta-stable state. Electrons do not have enough energy to leave the bonds.
answer
Molecules collide more frequently.
question
Which applies to the collision theory? Particles need to collide in order to react. Particles may obtain successful collisions in any molecular orientation. Temperature increase causes kinetic energy of particles to decrease. Reactions do not have to begin with collision of molecules or particles.
answer
Particles need to collide in order to react.