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3 years ago

In which natural cycle must an important gas in Earth's atmosphere be fixed before plants can use it?

Chemistry

2 answers:

makvit [3.9K]3 years ago

7 0

Answer: Nitrogen Cycle

Explanation:

The nitrogen cycle is one of the most important biogeochemical cycle. It is an essential gas present in the atmosphere.

It is vital for the growth of plants and animals. Animals derive this nutrient by eating plants. But plants cannot take it in the form of nitrogen gas it takes it in different forms.

This is because the nitrogen fixing bacteria fixes nitrogen which means it converts nitrogen in the form which can be used by the plants.

So, the correct answer is nitrogen cycle as it needs to be modified before being used by plants.

Maru [420]3 years ago

5 0

The answer is C . nitrogen cycle

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Consider the chemical equations shown here.

jarptica [38.1K]

Answer:

-1,300 kJ

Explanation:

P₄ + 3 O₂ ⇒ P₄O₆ ΔH = -1,640.1 kJ (EQ 1)

P₄O₁₀ ⇒ P₄ + 5 O₂ ΔH = 2,940.1 kJ (EQ 2)

These are the equations you are given. You need to make these equations into the equation below.

P₄O₆ + 2 O₂ ⇒ P₄O₁₀ (end equation)

Look at the product side of the end equation. You need to produce P₄O₁₀. In the EQ 2, P₄O₁₀ is on the reactant side. Flip the equation. Since you flipped the equation, the enthalpy will have the opposite sign.

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On the reactant side of the end equation, you need P₄O₆ and 2 O₂. First, rearrange the equation so that P₄O₆ is on the right side. In EQ 1, P₄O₆ is on the product side. Flip the equation. Like the last one, the sign will change.

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This should be the resulting equation. Now, add the two enthalpies together to find the overall enthalpy.

-2,940.1 kJ + 1,640.1 kJ = -1,300 kJ

The overall enthalpy is -1,300 kJ.

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4 years ago