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kow [346]
2 years ago
15

What was the primary cause of the increase in oxygen content between 400 and 300 million years ago

Chemistry
1 answer:
Gelneren [198K]2 years ago
4 0

Answer:

What was the primary cause of the increase in oxygen content between 400 and 300 million years ago

Explanation:

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When performing physical exercise, the heart rate, by what percentage can it be increased?
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What is the limiting reactant for the following balanced equation when 9 moles of AlF3 are mixed with 12 miles of O2?
tamaranim1 [39]
<h2>Answer:AlF_{3} </h2>

Explanation:

The chemical equation of the reaction that occurs when AlF_{3} reacts with O_{2} is

4AlF_{3}+3O_{2}→2Al_{2}O_{3}+6F_{2}

4 moles of AlF_{3} requires 3 moles of O_{2}.

1 mole of AlF_{3} requires \frac{3}{4} moles of O_{2}.

Given that we have 9 moles of AlF_{3}.

9 moles of AlF_{3} requires \frac{3}{4}\times 9=6.75 moles of O_{2}.

But we have 12 moles of O_{2}.

So,AlF_{3}  will be consumed first.

So,AlF_{3}  is the limiting reagent.

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Which pair of elements would most likely form a covalent bond
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Nonmetals and nonmetals tend to form covalent bonds.

or

P and S

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Describe the modem system of cassification,
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The scientific name given to an organism is based on binomial nomenclature.

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