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neonofarm [45]
3 years ago
8

Balance this equation- Fe + O2 Fe3 O4

Chemistry
1 answer:
kherson [118]3 years ago
7 0
3Fe + 2O2 —- Fe3 + O4
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How much energy (in J) is lost when a sample of iron with a mass of 26.4 g cools from 74.0 ∘C to 26.0 ∘C?
Greeley [361]

Answer:

Q=-526.6J

Explanation:

Hello,

In this case, for the computation of the energy loss when the cooling process is carried out, we use the shown below equation:

Q=mCp\Delta T

Whereas we need the mass, specific heat and change in temperature of iron within the process. Thus, the only value we need is the specific heat that is 0.444 J/(g°C), therefore, we compute the heat loss:

Q=26.4g*0.444\frac{J}{g\°C}*(26.0\°C-74.0\°C)\\ \\Q=-526.6J

Negative sign points out the loss due to the cooling.

Regards.

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3 years ago
What does the octet rule have to deal with covalent bonds
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<span>Rule of the octet is used in chemistry to indicate the tendencies of the atoms when they complete the energy level to obtain stability. Covalent bonds are what occurs when two atoms join and reach the stable octet. They are related because through this union electrons are shared and the covalent bond is produced and the rule of the octet is given to show the tendency of this union.</span>
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3 years ago
Explain your reasoning to why the rusting of iron is a chemical change (evidence not needed but may add it) ​
Tju [1.3M]

When an iron object is left in damp air for a considerable time, it gets covered with a reddish- brown flaky substance called rust. ... Rusting of iron is a chemical change because a new substance iron oxide is formed. The presence of oxygen and water or water vapour is essential for rusting.

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Please help due soon fill in the blanks will give brainliest
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Answer:

Proton has positive charge (+) and located in nucleus

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The claim is the farther the ball drops the higher it will bounce. What are the reasonings and evidence
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Answer:

Hey,

As the ball falls, it gains gravitational kinetic energy or GKE, all that means is that it starts to move faster as it falls, As it does so it gains more and more energy so that when it falls it will bounce realy high, it can't destribute all that energy in 1 hit, for such a task you would need a cannon ball.

<em><u>Wbob1314</u></em>

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