Introduction to Le Chatelier's Principle

AP Chemistry· difficulty 3/5

For A(g) <-> B(g) the plot above shows concentrations vs time, with a stress applied at the dashed line.

What stress was applied?

A
$A was suddenly added$
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B
$B was suddenly added$
C
$Volume was decreased$
D
$Temperature was increased and reaction is exothermic$

Explanation

[A] jumps up at the dashed line while [B] is unchanged at that instant; afterward A decreases and B increases until a new equilibrium is reached. This is consistent with adding A.

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