A student made a sketch of a potential energy diagram to represent an exothermic reaction. A curve line graph is shown. The y axis of the graph has the title Potential Energy and kJ written in parenthesis. The x axis of the graph has the title Reaction Pathway. The curve begins at a lower level and ends at a slightly higher level. A broken horizontal line is shown from a point labelled X on the y axis to the point where the curve begins. Another broken horizontal line is shown from a point labeled Y on the y axis to the point where the curve ends.

Explain, using complete sentences, why the diagram made by the student is correct or incorrect. Be sure to also explain what the values of X and Y represent.

Since heat is released for

C

3

H

8

(

g

)

+

5

O

2

(

g

)

→

3

CO

2

(

g

)

+

4

H

2

O

(

g

)

+

2219.9

kJ

,

we say that

Δ

H

∘

C

=

−

2219.9 kJ/mol propane

. We approximate that this is the change in potential energy for the reactants going to the products.

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The above is for an endothermic reaction.

A certain feature of combustion reactions suggests that you should draw the diagram DIFFERENTLY from what you see above. How should the energy of the products compare with that of the reactants for combustion reactions?

answer; /// the amount of material dissolved in a measure of liquid(concentration) the above statement is (true); /// good luck

a electronegativity decreases beacuse the size of nucleus is bigger.