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Damm [24]
3 years ago
10

Tipo de reacciónMg + O₂>MgO + 1199.66 kJ​

Chemistry
1 answer:
koban [17]3 years ago
5 0

Answer:

An exothermic combination reaction

Explanation:

There are two aspects to consider regarding this reaction, as it doesn't only provide the reaction but it also includes the enthalpy change for the reaction.

In terms of this reaction, magnesium atom combines with oxygen molecule to produce one product, magnesium oxide. This may be classified as a combination reaction.

Now, we also see that we released a total of 1199.66 kJ of heat as our product. There are two types of reactions in terms of the enthalpy change: exothermic reactions (those that release heat) and endothermic reactions (those that consume heat).

The enthalpy change for exothermic reactions is negative and it's positive for endothermic reactions.

However, here we're actually given heat as a product. If we have it as a product, this means heat was released into the surrounding by this reaction and we have an exothermic reaction.

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If air is a fluid, why do we not include the buoyant force caused by the displacement of air by the objects in this experiment?
uysha [10]

Archimedes' principle allows us to find that the reasons why the thrust is not written when a body is in the air is:

  • The thrust of air is about 800 times less than the thrust of a fluid
  • In general the other forces (weight, tension) are much greater than thrust

Archimedes' principle establishes that the thrust is equal to the weight of the dislodged liquid (fluid)

        B = ρ g V

Where B is the thrust, ρ and V the density and volume of the fluid, respectively, g the acceleration due to gravity.

In the attachment you have a diagram of a system in equilibrium in air and water, we can see that in the two cases for a system in equilibrium

                         B -W = 0

                         B = W

Let's find the value of the thrust in each case and compare

               B_{air} = \rho_{air} g V_{air}

               B_{water} = \rho_{water} \ g V_{water}

Used the density

               \rho_{air} = \  1.26 \  kg/m^3 \\\rho_{water} = 997 kg/m^3

               B_{air} = 1.26 \ g \ V_{air}\\B_{water} = 997 \ g \ V_{water}

Suppose that the volume of the two bodies is the same

               B_{water} = 792 B_{air}r

           

We can see that the thrust in air or other gas is about 800 times less than the thrust in liquids. This is the reason that in many problems the thrust is not written when the body is in the air.

In conclusion, using Archimedes' principle, we find that the reason why the healed thrust is not written for a body is in the air is:

  • The thrust of air is about 800 times less than the thrust of a fluid
  • In general the other forces (weight, tension) are much greater than thrust

Learn more about Archimedes' principle here:

brainly.com/question/787619

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Most lakes have rivers flowing out of them, carrying water to the ocean. However, some lakes, including the Great Salt Lake and
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The lack of an outlet will affect the composition of these lakes by causing an accumulation of organic and inorganic nutrients due to decomposition of living materials.

<h3>What is a lake?</h3>

Lake is a small stream of running water or a channel for water.

Lakes are usually a standing body of water or slow moving. This means that some lakes, including the Great Salt Lake and the Dead Sea, have no outlet.

The lack of an outlet will affect the composition of these lakes by causing an accumulation of organic and inorganic nutrients due to decomposition of living materials.

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