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3 years ago

8. Which of the following are reasons why Index fossils are chosen for determining ages of rocks? Select all that apply .

Chemistry

2 answers:

WITCHER [35]3 years ago

5 0

Answer:

d and b

Explanation:

igomit [66]3 years ago

4 0

Answer:

B. Distributed over a very wide range

D. Limited life existence in geologic time.

Explanation:

Index fossils are very unique fossils that helps in determining the relative ages of rocks and biostratigraphic correlation. They are usually called guide fossils.

Fossils are the preserved remains of dead organisms found in rocks.
Index fossils are a special class of fossils with the following properties;

They are widely distributed.
They have a short stratigraphic range.
They show rapid evolution trends

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3 years ago

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Answer:

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marysya [2.9K]

The answer is 7.

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The given acid is HCl which is a strong acid and the base NaOH is also a strong base.
Calculate the moles of acid HCl:

Molarity of $HCl$ = 0.100 M

Volume of $HCl$ = 50 mL = 0.050 L

$Moles\ of\ HCl\ = Molarity\ of\ HCl$ × $Volume\ of\ HCl\ in\ L$

$= 0.100\ M$ × $0.050\ L = 0.005\ moles$

At equivalence point, same moles of base are added and thus it results into complete neutralization. Thus, all the hydrogen ions of acid are neutralized by the hydroxide ions of the base forming only water and neutral salt.
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To learn more about pH at equivalence point visit:

brainly.com/question/23942601

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Answer:

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Explanation:

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