What causes an electron in an atom to move to a higher energy level a. it emits a specific amount of light energy

b. it absorbs chemical energy

c. it absorbs a specific amount of light energy

d. it releases chemical energy

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

1 a

2 d

3 a

4 c

explanation:

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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