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pshichka [43]
2 years ago
14

Paleomagnetic evidence was used to confirm which of the following hypotheses?

Chemistry
2 answers:
expeople1 [14]2 years ago
5 0

Answer;

C. seafloor spreading

Explanation;

The theory of seafloor spreading states that new ocean crust is continually being formed, and that this crust is slowly carried away from its point of origin over a period of time.

Paleomagnetism helped explain an unusual observation from the 1950s. Magnetic studies revealed that the ocean floor was comprised of parallel bands of crust having alternating magnetic polarity.These magnetic bands were symmetric about the mid-oceanic ridge.

svetoff [14.1K]2 years ago
4 0
The answer is c) seafloor spreading 
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ubstance A undergoes a first order reaction A®B with a half-life, t½, of 20 min at 25 °C. If the initial concentration of A in a
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Half-life = 20 min

First we have to calculate the rate constant, we use the formula :

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k=\frac{0.693}{20\text{ min}}

k=3.465\times 10^{-2}\text{ min}^{-1}

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

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a = initial amount of the reactant  = 1.6 M

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Now put all the given values in above equation, we get

80=\frac{2.303}{3.465\times 10^{-2}}\log\frac{1.6}{a-x}

a-x=0.100M

Therefore, the concentration of A after 80 min is, 0.100 M

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