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3 years ago

1. How can scientists use fossils in rock layers as evidence that one event happened earlier than another event?

Chemistry

1 answer:

Komok [63]3 years ago

6 0

Answer:

Fossils in rock, in general, provide information about the creatures and plants that lived in the past.

The reason for this is that as those organisms die, they disintegrate and generate silts, which over millions of years go deep into the lithosphere.

As a result, scientists may use the radiocarbon dating technique to determine the age of the fossils. Another method is employed to determine the sort of organism that once existed.

As a result, scientists can infer proof that an event occurred on Earth as long as a million years ago through the application of these approaches.

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3 years ago

HELP <br> The question is in the picture, I will give 5 stars!

Fynjy0 [20]

The answer is 4.9 moles of salt will be needed to add to 1 kg of water to change the boiling point by 5 °C.

<h3>What is Boiling Point Elevation ?</h3>

Boiling point elevation is the phenomenon that occurs when the boiling point of a liquid (a solvent) is increased when another compound is added, such that the solution has a higher boiling point than the pure solvent.

Boiling point elevation occurs whenever a non-volatile solute is added to a pure solvent.

ΔT = i * Kb * m

where m, Kb and i are the molality of solution, ebullioscopic constant and Van't Hoff factor respectively

The data given in the question is ΔT = 5 °C

mass of solvent = 1 kg

Kb = 0.51 °C/(mol/kg)

Van't Hoff Factor for NaCl is 2

Substituting the values in the above equation

$\rm 5 = \rm\dfrac{2\times0.51\times moles \;of \;salt}{1}$

$\rm moles \;of \;salt = \rm\dfrac{5}{2\times0.51}$

moles of salt = 4.9

Therefore 4.9 moles of salt will be needed to add to 1 kg of water to change the boiling point by 5 °C.

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2 years ago

A sample of a gas is occupying a 1500 ml container at a pressure of 3.4 atm and a temperature of 25 oc. if the temperature is in

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<h3>General gas law</h3>

The problem is solved using the general gas equation:

P1V1/T1 = P2V2/T2

In this case, P1 = 3.4 atm, V1 = 1500 mL, T1 = 25 $^O C$ , V2 = 2000 mL, and T2 = 75 $^O C$

What we are looking for is P2.

Thus, P2 = P1V1T2/T1V2

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2 years ago

1. How can scientists use fossils in rock layers as evidence that one event happened earlier than another event?​

1. How can scientists use fossils in rock layers as evidence that one event happened earlier than another event?