3 years ago

Dark areas on the surface of the Sun that exhibit intense magnetic activity are

2 answers:

7 0

A. sunspots
a spot or patch appearing from time to time on the suns surface, appearing dark by contrast with its surroundings, hope this helps

svp [43]3 years ago

6 0

I think it's A) Sunspots. I hope this helps:)

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The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 85% of a sample of cyclopropane changes t

Nataliya [291]

Answer:

so rate constant is 4.00 x 10^-4 $s^{-1}$

Explanation:

Given data

first-order reactions

85% of a sample

changes to propene t = 79.0 min

to find out

rate constant

solution

we know that

first order reaction are

ln [A]/[A]0 = -kt

here [A]0 = 1 and (85%) = 0.85 has change to propene

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that why

[A] / [A]0= 0.15 / 1

[A] / [A]0 = 0.15

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k = 4.00 x 10^-4 $s^{-1}$

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