Skin pigments actually protect us from ultraviolet rays!
Answer:
d
Explanation:
i think I haven't studied this in a while but I'm confident in that answer
Answer:
D. Geologist compare the observed abundance of naturally occurring radioactive isotopes and their decay products using decay rates.
Explanation:
Radioactive dating is the method in which radioactive isotopes are employed to evaluate the age of rocks and ores. There are many complex radioisotopes utilized for radioactive dating is like Potassium, Uranium, and Carbon. Radioactive dating operates on the system that a radioactive isotope can fade into the constant daughter nuclei at a steady rate. Geologist commonly uses the system for half life. Half-life is the time needed for half of the radioactive element to decline. This is fixed for a selective element.
They are going to be using the <em>metric system,</em> as it is the official nationally used system of measurement for scientists. =)
The reaction is endergonic.
<h2>Procedure - Determination of the Gibbs reaction type</h2>
<h3>Thermochemical model</h3>
First, we need to determine the Gibbs free energy function (
), in kilojoules, of the entire reaction by this formula:
(1)
Where:
- Number of kilomoles of the i-th reactive, in kilomoles.
- Number of kilomoles of the j-th product, in kilomoles.
- Specific Gibbs free energy function of the i-th reactive, in kilojoules per kilomole.
- Specific Gibbs free energy function of the j-th reactive, in kilojoules per kilomole.
<h3>Data from thermochemical tables</h3>
From thermochemical tables we have the following information:
Reactives
, 
, 
Products
, 
, 
<h3>Determination of the Gibbs free energy function</h3>
Now we proceed to determine the Gibbs free energy function and later determine the nature of the <em>thermochemical</em> reaction:


The Gibbs free energy function of the <em>entire</em> reaction is 625616 kilojoules.
<h3>Analysis of the result</h3>
The Gibbs free energy function has a <em>positive</em> sign, which means that this reaction is endergonic.
To learn more on Gibbs free energy, we kindly invite to check this verified question: brainly.com/question/9552459