AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRLab: Enthalpy

Lab: Reaction Rate Answers

0 verified answers1 views
1
Free Preview

The diagram below shows the movement of particles.What does this piece of evidence best support?

Question illustration
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
2
Free Preview

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.
3

Consider the energy diagram below.xn.Which line indicates a higher reaction rate?

Question illustration
A
A because it has a lower activation energy.
B
B because it has a lower activation energy.
C
A because its Grxn is much lower.
Option C
D
B because its Grxn is much lower.
Option D
4

Consider the reaction below.C2H4(g) + H2(g) C2H6(g)Which change would likely cause the greatest increase in the rate of the reaction?

Question illustration
A
decrease temperature and decrease pressure
B
increase temperature and decrease pressure
C
decrease temperature and increase pressure
D
increase temperature and increase pressure
5

Magnesium oxide does not readily decompose into magnesium and oxygen. The reaction is shown below.MgO(s) + 601.7 kJ Mg(s) + ½O2(g)Which factor plays the most important role in allowing this reaction to occur?

Question illustration
A
temperature
B
concentration
C
pressure
D
surface area
6

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
7

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.
8

The production of water proceeds according to the following equation.2H2(g) + O2(g) 2H2O(g)Which describes a way to speed up the collisions between hydrogen and oxygen molecules to produce more water?

Question illustration
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.
9

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
10

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?

A
More bubbles will be produced because the solution is becoming more concentrated.
B
Fewer bubbles will be produced because of fewer collisions of reactant molecules.
C
The solid will get smaller at a faster rate because of more collisions of reactant molecules.
D
The solid will get larger at a slower rate because precipitate is coming out of the solution.

Did you find these answers helpful?

More from this Course

Quiz
10 verified answers

Gas Laws

Quiz
10 verified answers

Writing and Balancing Chemical Equations

Quiz
10 verified answers

Writing and Balancing Chemical Equations