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2 years ago

What conditions on Earth allow life to thrive?

Chemistry

2 answers:

olga_2 [115]2 years ago

8 0

Answer:

atmosphere containing free oxygen --> atmosphere shielding against UV --> ozone layer in upper atmosphere --> axis of rotation generally perpendicular to orbital plane --> magnetic field that deflects the solar wind --> liquid water --> temperature near the triple point of water --> range of temperature sufficiently narrow, over appreciable portion of the planet's surface, conducive to the chemistry of life

satela [25.4K]2 years ago

7 0

Ugghhhhhhhhhhhhhhhhhhhhhhhhhh

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True or false: chemical reactions are usually written left to right

nika2105 [10]

Answer:

true. e.g

iron+water+oxygen->hydratedironoxide

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1 year ago

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One success of Johann Döbereiner's law of triads was that it organized most of the known elements into three-element groups base

jenyasd209 [6]

That statement is true

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2 years ago

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Gasoline and kerosene (specific gravity 0.820) are blended to obtain a mixture with a specific gravity of 0.770. Calculate the v

Dmitrij [34]

Answer:

The volumetric ratio is 0,71

Explanation:

Let's begin with the equation:

$Db = Mb/Vb$ (1)

Where:

Db: Blend Density, Mb: Blend Mass and Vb: Blend Volume

And we know: $Vb = Vg + Vk$ (2)

Where:

Vg: Gasoline Volume and Vk: Kerosene Volume

Therefore replacing (2) into (1):

$Db = (Mg + Mk) / (Vg + Vk)$

$Db = (Dg * Vg + Dk * Vk)/(Vg + Vk)$ (3)

Where:

Dg: Gasoline Density and Dk: Kerosene Density

The specific gravity is defined as:

$SG = Substance Density / Reference Density$

Therefore:

$Db = SGb * Dref\\Dg = SGg * Dref\\Dk = SGk * Dref$

Where:

Dref: Reference Density

SGb: Blend Specific Gravity

SGg: Gasoline Specific Gravity (which is 0.7 approximately)

SGk: Kerosene Specific Gravity

Replacing these equations into (3) we get:

$SGb * Dref = (SGg * Dref * Vg + SGk * Dref * Vk)/(Vg + Vk)$

$SGb * Dref = Dref * (SGg * Vg + SGk * Vk)/(Vg + Vk)$

$SGb = (SGg * Vg + SGk * Vk)/(Vg + Vk)$

$SGb * (Vg + Vk) = SGg * Vg + SGk * Vk$

$SGb * Vg + SGb* Vk = SGg * Vg + SGk * Vk$

Replacing with the Specific Gravity data, we obtain:

$0.77 * Vg + 0.77 * Vk = 0.7 * Vg + 0.82 * Vk$

$0.77 * Vg - 0.7 * Vg = 0.82 * Vk - 0.77 * Vk$

$0.07 * Vg = 0.05 * Vk$

$Vg/Vk = 0.05/0.07$

$Vg/Vk = 0.71$

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2 years ago

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Marina86 [1]

Answer:

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Explanation:

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2 years ago

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Kaylis [27]

1. Decreases by 4. (B)
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2 years ago

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