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6.03 Honors Assignment It is time to practice using potential-(Answered)

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6.03 Honors Assignment

 

It is time to practice using potential energy diagrams. Respond to the three questions below on

 

energy diagrams and submit to your instructor. Make sure you include your units in your

 

calculations.

 

1. Consider the potential energy diagram shown below. This graph shows the chemical

 

potential energy in a reaction system over time. The y?axis is potential energy in

 

kilojoules. The x?axis is the reaction progress, or time.

 


 

a. Does this graph represent an endothermic or an exothermic reaction? Explain

 

your answer.

 

b. What is the enthalpy change, ?H, for this reaction? Show your work.

 

c. What is the activation energy, Ea, for this reaction? Show your work.

 

2. In a particular chemical reaction, the energy of the reactants is 30 kJ and the energy of the

 

products is 5 kJ. The maximum energy of the system is 40 kJ.

 

a. Sketch a potential energy diagram for this reaction. Make sure to label the energy

 

of the reactants, the energy of the products, the activation energy, and the enthalpy

 

change for the reaction. You can attach your graph to the assessment separately if

 

necessary.

 


 

b. What is the activation energy for this reaction?

 

c. What is the enthalpy change for this reaction?

 

d. Is this reaction endothermic or exothermic? Explain your answer in two ways:

 

first, using the energy values, and second, by referring to the shape of the graph.

 

3. The coating on the head of a match is highly flammable. When it burns, it releases a great

 

deal of energy. However, before the match can burn, it must gain a small amount of

 

energy from a spark. That spark is typically produced by striking (rubbing) the match

 

head against a rough surface. Sketch and describe a potential energy diagram that

 

represents the striking and burning of the match. Remember to label the diagram with the

 

energy changes that occur. Your answer must include the potential energy diagram and a

 

written description. (Note: you do not have to use actual energy values.) You can attach

 

your graph to the assessment separately if necessary.

 


 

 

Paper#9255995 | Written in 27-Jul-2016

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