By Pleistocene ice age is meant the glacial periods that appeared in the Pleistocene. The Pleistocene is the first epoch of the Quaternary. It is an epoch when there was a so called ''ice age'' on the Earth, or rather a glacial period. During this ice age the planet had much lower temperatures on a global scale. The climate was also much drier. Lot of ocean water was frozen in the ice sheets that were stretching deep into the North American and Eurasian continents, which resulted in much lower sea levels that today as well. The places further north than 40 degrees of latitude were almost exclusively covered with ice, so life was almost impossible apart from some coastline places.
Answer:
When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl).
Answer:
Ii is the circuit overload
Explanation:
Option (B) is the right answer.
Hydronium ion (
) concentration decreases by the <u>factor of 100</u>, if the pH of a solution increases from 2.0 to 4.0.
<h3>What is pH?</h3>
The hydrogen ion concentration in water is expressed by pH. Specific to aqueous solutions, pH is the <u>negative logarithm</u> of the hydrogen ion (H+) concentration (mol/L) : ![pH = -log_{10}[H_{3}O^{+} ]](https://tex.z-dn.net/?f=pH%20%3D%20-log_%7B10%7D%5BH_%7B3%7DO%5E%7B%2B%7D%20%20%5D)
Acidic solutions are those with a pH under 7, and basic solutions are those with a pH over 7. At this temperature, solutions with a pH of 7 are neutral (e.g.<u> pure water</u>). The pH neutrality <u>relies on temperature, falling below 7 if the temperature rises above 25 °C</u>.
<h3>Given: </h3>
pH1( initial pH) = 2.0
pH2( initial pH) = 4.0
[H3O+] = initial hydronium concentration
[H3O+]* = final hydronium concentration
<h3>Formula used : </h3>
![pH = -log_{10}[H_{3}O^{+}]](https://tex.z-dn.net/?f=pH%20%3D%20-log_%7B10%7D%5BH_%7B3%7DO%5E%7B%2B%7D%5D)
<h3>Solution: </h3>
![pH = - log_{10}[H_{3}O^{+}] \\\\= > 10^{-pH} = [H_{3}O^{+}] \\\\similarly, \\\\10^{-pH} = [H_{3}O^{+}]*\\\\ = > 10^{-4} = [H_{3}O^{+}]*\\\\Now, \frac{[H_{3}O^{+}]*}{[H_{3}O^{+}]} = 10^{-2}](https://tex.z-dn.net/?f=pH%20%3D%20-%20log_%7B10%7D%5BH_%7B3%7DO%5E%7B%2B%7D%5D%20%5C%5C%5C%5C%3D%20%3E%2010%5E%7B-pH%7D%20%3D%20%5BH_%7B3%7DO%5E%7B%2B%7D%5D%20%5C%5C%5C%5Csimilarly%2C%20%5C%5C%5C%5C10%5E%7B-pH%7D%20%3D%20%5BH_%7B3%7DO%5E%7B%2B%7D%5D%2A%5C%5C%5C%5C%20%3D%20%3E%2010%5E%7B-4%7D%20%3D%20%5BH_%7B3%7DO%5E%7B%2B%7D%5D%2A%5C%5C%5C%5CNow%2C%20%5Cfrac%7B%5BH_%7B3%7DO%5E%7B%2B%7D%5D%2A%7D%7B%5BH_%7B3%7DO%5E%7B%2B%7D%5D%7D%20%20%3D%2010%5E%7B-2%7D)
Thus , the concentration of hydronium ion decreases by 100.
To learn more about pH :
brainly.com/question/15289741
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