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3 years ago

What two methods are used for determining the age of rocks and fossils?

Chemistry

1 answer:

Alexandra [31]3 years ago

7 0

Explanation:

first one because absolute dating is a thing for rock layers

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Each substance in a solution mixture is visible to the naked eye? True or False

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False
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2 years ago

Do acids have ph above 7?

nata0808 [166]

No acids have a ph of less than 7 our rain is around a six. dilated water is a 7 and any thing above a 7 is a base

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Deep sea divers use a mixture of helium and oxygen to breathe. Assume that a diver is going to a depth of 150 feet where the tot

Svetlanka [38]

Answer:

4.525% is the percentage by volume of oxygen in the gas mixture.

Explanation:

Total pressure of the mixture = p = 4.42 atm

Partial pressure of the oxygen = $p_1=0.20 atm$

Partial pressure of the helium = $p_2$

$p_1=p\times \chi_1$ (Dalton law of partial pressure)

$0.20 atm=4.42 atm\times \chi_1$

$\chi_1=\frac{0.20 atm}{4.42 atm}=0.04525$

$\chi_2=1-\chi_1=1-0.04525=0.95475$

$chi_1+chi_2=1$

$n_1=0.04525 mol,n_2=0.95475 mol$

According Avogadro law:

$Moles\propto Volume$ (At temperature and pressure)

Volume occupied by oxygen gas = $V_1$

Total moles of gases = n = 1 mol

Total Volume of the gases = V

$\frac{n_1}{V_1}=\frac{n}{V}$

$\frac{V_1}{V}=\frac{n_1}{n}=\frac{0.04525 mol}{1 mol}$

Percent by volume of oxygen in the gas mixture:

$\frac{V_1}{V}\times 100=\frac{0.04525 mol}{1 mol}\times 100=4.525\%$

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3 years ago

Which of these plants make the enviroment pleasant<br><br> a.sandalwood b.basil c.brahmi

liberstina [14]

Sandalwood

Explanation:

this is the answer please mark me as brainleist

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Water evaporating from a puddle is an example of a

Flauer [41]

It is an example of physical change. The molecules are not changing, so it is not chemical, and a physical property is something that a physical thing has.

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