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3 years ago

Which of these is used to find the estimated age range of a fossil?

Chemistry

2 answers:

Maksim231197 [3]3 years ago

8 0

Answer:

Carbon-14

Explanation:

I don't know how to explain

BigorU [14]3 years ago

8 0

Answer:

Index fossils

Explanation:

Index fossils are the remains of living organisms for which we have already established relative age. These are fossils that only existed during a limited period of geologic time and are easily identified, found in large volumes, and found in many different locations around Earth. Due to these factors, index fossils may be used as a guide for comparison in determining the relative age of an unknown object.

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You have 0.672 L of 4.78 M aqueous AlCl3 solution in a glass. If you gently heat the solution until only 0.380 L is left, what i

vlada-n [284]

Answer:

8.45 M

Explanation:

To solve this problem we need to keep in mind the definition of molarity:

Molarity = moles / volume

First we calculate the moles of AlCl₃ in 0.672 L of a 4.78 M solution:

Moles = Molarity * volume

Moles = 4.78 M * 0.672 L

Moles = 3.212 moles

Then we calculate the new molarity of the AlCl₃ solution using that number of moles, which remains the same throughout the evaporation process:

New Molarity = 3.212 moles / 0.380 L

New Molarity = 8.45 M

3 0

3 years ago

Calculate the number of moles in 15 liters of oxygen at STP.

zloy xaker [14]

the answer is 0.67 mol.

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3 years ago

What happens to the water particles in a wave?

PIT_PIT [208]

Answer:

C. The water particles move up through the wave.

4 0

3 years ago

_al(s)+_HCL(aq) AlCl3(aq)+_H2(g)

Novay_Z [31]

2Al + 6HCl -> 2AlCl3 + 3H2

5 0

3 years ago

Which of these compounds is not a molecule? A) MgO B)SO2 C)CO D) CS2

DerKrebs [107]

A) MgO
Hope that helps

5 0

3 years ago