What main criterion determines major divisions in the geologic time scale?

Chemistry

1 answer:

koban [17]3 years ago

4 0

The answer is B. the occurrence of huge events in Earth's natural history

The geologic time scale is a system of chronological dating that relates geological strata to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.

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The number of molecules of nitrogen, n2, found in 500.0 g of nitrogen gas is?

8_murik_8 [283]

The molar mass of monotonic Nitrogen is 14 g/mol. Since this is diatomic Nitrogen, double that to 28 g/mol.
Next, divide total mass by molar mass, 500 g / 28 g/mol, which gives 17.8571 moles. A mole is defined as being 6.022*10^23 molecules, so multiply moles by molecules/mol (Avogadro's number), and we finally end up with something like 1.075 * 10^25, give or take a few billion particles.

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What was helium used for in the past?

yawa3891 [41]

Helium used to be used in hot air balloons. Then, when the Hindenburg exploded, annexed file, they realized that hydrogen was not only lighter, but it also was less flammable.

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3 years ago

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How many liters of hydrogen gas I needed to react with CS2 to produce 2.5 L of CH4 At STP

olchik [2.2K]

Answer:

9.8 L

Explanation:

The reaction that takes place is:

4H₂(g) + CS₂(g) → CH₄(g)+ 2H₂S(g)

At STP, 1 mol of any gas occupies 22.4 L.

We calculate how many moles are there in 2.5 L of CH₄ at STP:

2.5 L ÷ 22.4 L/mol = 0.11 mol CH₄

Then we convert CH₄ moles into H₂ moles, using the stoichiometric coefficients of the reaction:

0.11 mol CH₄ * $\frac{4molH_2}{1molCH_4}$ = 0.44 mol H₂

Finally we calculate the volume that 0.44 moles of H₂ would occupy at STP:

0.44 mol * 22.4 L/mol = 9.8 L

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3 years ago

Which can be changed when balancing a chemical equation, the coefficient or the subscripts? Why?

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Coefficients need to be changed while balancing a chemical reaction beacuse subscript show how the molecule exists in nature

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Handing out brainliest to the correct answer!!!

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Answer -C They are defined by the number of electrons.
An orbital is a function that describes the probability of finding the electron with certain energy at certain distance from the nucleus therefore, it is defined by the number of electrons.

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