8. What must occur for a change to be a chemical reaction? a. There must be a change in chemical properties.
b. There must be a change in physical properties.
The change must involve a change in volume.
d. The change must involve a change in mass.
C.
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A. there must be a change in chemical properties  

Explanation:

since electrons are negative the answer is neagtaive

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

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