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sweet [91]
3 years ago
14

In which reaction would the activation energy result in an endothermic reaction?

Chemistry
2 answers:
miv72 [106K]3 years ago
7 0

Answer : The correct option is, An egg cooking

Explanation :

  • Endothermic reaction : It is a type of chemical reaction in which the energy is absorbed from the surrounding.
  • Exothermic reaction : It is a type of chemical reaction in which the energy is released into the surrounding.

Water freezing  : It is an exothermic process. In this process, the heat is released when the phase changes from the liquid state to solid state.

An egg cooking  : It is an endothermic process. In this process, the heat is absorbed when the phase changes from the solid state to liquid state.

A candle burning : It is an exothermic process because the more amount of  heat is released when candle burns.

Iron rusting : It is an exothermic process because heat is released during the iron rusting process.

Hence, an egg cooking  is an endothermic reaction.

egoroff_w [7]3 years ago
3 0

Just did the test.

Answer is "An egg cooking".

I thought it was a candle burning because it keeps going until the light goes out but was wrong :( lol.

Hope this helps!

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During a combustion reaction, 9.00 grams of oxygen reacted with 3.00 grams of CH4.
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Answer:

0.74 grams of methane

Explanation:

The balanced equation of the combustion reaction of methane with oxygen is:

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it is clear that 1 mol of CH₄ reacts with 2 mol of O₂.

firstly, we need to calculate the number of moles of both

for CH₄:

number of moles = mass / molar mass = (3.00 g) /  (16.00 g/mol) = 0.1875 mol.

for O₂:

number of moles = mass / molar mass = (9.00 g) /  (32.00 g/mol) = 0.2812 mol.

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using cross multiplication

1 mol of  CH₄ needs → 2 mol of O₂

???  mol of  CH₄  needs → 0.2812 mol of O₂

∴ the number of mol of CH₄ needed = (0.2812 * 1) / 2 = 0.1406 mol

so 0.14 mol will react and the remaining CH₄

mol of CH₄ left over = 0.1875 -0.1406 = 0.0469 mol

now we convert moles into grams

mass of CH₄ left over = no. of mol of CH₄ left over *  molar mass

                                    = 0.0469 mol * 16 g/mol = 0.7504 g

So, the right choice is 0.74 grams of methane

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