Dear friends, Please read our latest blog post for an important announcement about the website. ❤, The Socratic Team

HELP, Reaction Rate?

Write a balanced equation for the combustion of heptane at 25 o C (not in a closed
system).
State how the reaction rate will be affected and give a reason for each prediction if
a) oxygen is added at constant volume
b) catalyst is added
c) the reaction mixture is expanded
d) carbon dioxide is added at constant volume
e) the temperature is lowered

Write a balanced equation for the combustion of heptane at 25 o C (not in a closed
system).
State how the reaction rate will be affected and give a reason for each prediction if
a) oxygen is added at constant volume
b) catalyst is added
c) the reaction mixture is expanded
d) carbon dioxide is added at constant volume
e) the temperature is lowered

1 Answer
Write your answer here...
Start with a one sentence answer
Then teach the underlying concepts
Don't copy without citing sources
preview
?

Answer

Write a one sentence answer...

Answer:

Explanation

Explain in detail...

Explanation:

I want someone to double check my answer

Describe your changes (optional) 200

1
Al E. Share
May 26, 2018

This question requires a fairly good understanding of kinetics and equilibrium.

Consider,

#C_7H_16 + 11O_2 rightleftharpoons 7CO_2 + 8H_2O#

If oxygen is added at constant volume, #pO_2# increases, the rate will generally increase.

If a catalyst is added, it will lower the activation energy by providing an alternative pathway, and increase the rate.

If the reaction mixture is expanded, the reactants' density in space will decrease, less collisions will occur, and the rate will decrease.

If carbon dioxide is added at constant volume the equilibrium will shift left (Le Chatlier's principle) and the rate would probably decrease by some factor.

If the temperature is lowered, a smaller distribution of the population of reactant molecules will have the requisite kinetic energy to collide at the right speed to react. Hence, the rate will decrease.

Was this helpful? Let the contributor know!
1500
Trending questions
Impact of this question
25 views around the world
You can reuse this answer
Creative Commons License