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Alex
3 years ago
7

The man who developed the concept that light is emitted and absorbed in bundles or packets was:

Chemistry
2 answers:
Mnenie [13.5K]3 years ago
4 0

Answer:

Planck

Explanation:

Light is emitted and absorbed as energy packets. Photons are quantized. According to Planck’s equation, E = hν, where E is the energy of the photon, h is Planck’s constant and v is the frequency of light. Therefore the energy of the quantum of light is directly proportional to the frequency of light.

ludmilkaskok [199]3 years ago
3 0
Planck suggested that light/energy was absorbed/released in certain amounts, called quanta.
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A reaction is second order respect to the reactant A. If the reaction is 85% complete in 12 minutes, how long would it take for
AnnZ [28]

Answer:

e. 22s

Explanation:

Initial Concentration = 100

Final concentration = 15 ( Since the reaction is 85% complete)

Time = 12 minutes = 720 seconds

The integrated rate law for second order reactions is given as;

1 / [A] = (1 / [A]o) + kt

Making k subject of interest, we have;

kt = (1 / [A] ) - (1 / [A]o )

k = (1 / [A] ) - (1 / [A]o ) / t

k = [(1/ 15) - (1 / 100) ] / 720

k = (0.0667 - 0.01 ) / 720

k = 0.0567 / 720

k = 7.875e^-5

How long would it take for the reaction to be 15% complete?

Final concentration = 85 (Since the reaction would be 15% complete)

The integrated rate law for second order reactions is given as;

1 / [A] = (1 / [A]o) + kt

Making t subject of interest, we have;

kt = (1 / [A] ) - (1 / [A]o )

t = (1 / [A] ) - (1 / [A]o ) / k

t = [(1 / 85 ) - (1 / 100) ] / 7.875e^-5

t = (0.0117 - 0.01 ) / 7.875e^-5

t = 0.001765 / 7.875e^-5

t = 22.41 seconds

Corect option = E.

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How would the world be different if people were not aware of radioactive decay
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kakasveta [241]

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Explanation:

∆G= ∆H-T∆S

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3 0
3 years ago
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