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Lana71 [14]
2 years ago
10

Which of the following is not an example of a chemical change?

Chemistry
1 answer:
Eva8 [605]2 years ago
8 0
D I think.. hopefully it helps a little
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Does a metal conduct electricity in the solid state?
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a factor of 8, it means that A is now only 1/8 of its original concentration. A first order reaction, where A → products, has a
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It takes 1.32x10⁻⁷s for the concentration of A to fall by a factor of 8

Explanation:

The equation that represents a first-order kinetics is:

Ln ([A] / [A]₀] = -kt

<em>Where [A] is actual concentration, [A]₀ is initial concentration, K is rate constant (For the given problem, 1.57x10⁷s⁻¹ and t is time.</em>

<em />

As you want the time when you have [A] in a factor of 8 = [A] / [A]₀ = 1/8

Replacing:

Ln ([A] / [A]₀] = -kt

Ln (1/8) = -1.57x10⁷s⁻¹*t

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<h3>It takes 1.32x10⁻⁷s for the concentration of A to fall by a factor of 8</h3>

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