3 years ago

Almost all of the oxygen on the planet Earth is found in the atmosphere. Is this true or false?

Chemistry

2 answers:

irakobra [83]3 years ago

4 0

False..................

solong [7]3 years ago

3 0

<span>False. Almost all of the oxygen on Earth is found in the oceans.</span>

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The first excited electronic energy level of the helium atom is 3.13 x 10-18 J above the ground level. Estimate the temperature

salantis [7]

Answer:

75603.86473 K

Explanation:

Given that:

The 1st excited electronic energy level of He atom = 3.13 × 10⁻¹⁸ J

The objective of this question is to estimate the temperature at which the ratio of the population will be 5.0 between the first excited state to the ground state.

The formula for estimating the ratio of population in 1st excited state to the ground state can be computed as:

$\dfrac{N_2}{N_1} = e ^{^{-\dfrac{(E_2-E_1)}{KT}}} = e ^{^{-\dfrac{(\Delta E)}{KT}}}$

From the above equation:

Δ E = energy difference = 3.13 × 10⁻¹⁸ J

k = Boltzmann constant = 1.38 × 10⁻²³ J/K

$\dfrac{N_2}{N_1} = 0.5$

Thus:

$0.05 =e^{^{ -\dfrac{3.13 \times 10^{-18} \ J}{1.38\times 10^{-23 \ J/K}\times T}}}$

$In (0.05) = { -\dfrac{3.13 \times 10^{-18} \ J}{1.38\times 10^{-23 \ J/K}\times T}}}$

$-3.00 = { -\dfrac{3.13 \times 10^{-18} \ J}{1.38\times 10^{-23 \ J/K}\times T}}}$

$-3.00 = -226811.5942 \times \dfrac{1}{T}$

$T = \dfrac{-226811.5942}{-3.00 }$

T = 75603.86473 K

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2 years ago

Which of these elements has two valence electrons? A.hydrogen B.barium C.nitrogen D.krypton E.bromine

Umnica [9.8K]

Answer:

Barium

Explanation:

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2 years ago

You find a geode while hiking. You place it on a scale and find it has a mass of 62 g.

dexar [7]

Answer:

Explanation:

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3 years ago

If aluminum is heated from 650°C to 670°C, then it will change from a A.liquid to a gas. B.liquid to a solid. C.solid to a liqui

kirill115 [55]

Answer: C

Explanation:

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3 years ago

When two molecules of methanol (CH3OH) react with oxygen, they combine with three O2 molecules to form two CO2 molecules and fou

Alex17521 [72]

Answer:

188

Explanation:

For every 2 molecules of methanol reacted, 4 molecules of water are formed. Use this relationship to solve.

2/4 = 94/x

2x = 376

x = 188

188 molecules of water will be formed.

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3 years ago