3 years ago

How and why are Endothermic and Exothermic reactions chemical changes?

1 answer:

8 0

Answer:

Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.

Explanation:

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What is electron configuration. dont use googlrl plz

Maksim231197 [3]

Answer:

Electron configuration is the structural arrangement notation of electrons in the shells or energy levels of an atom.

Explanation:

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3 years ago

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Which horizon would have the highest amount of organic material?

alexandr402 [8]

O horizon is the answer

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2 years ago

Acetylene reacts with hydrogen in the presence of a catalyst to form ethane according to the following reaction:

ElenaW [278]

Answer:

mole fraction of acetylene in the original mixture = 0.29

Explanation:

The application of Dalton's law of partial pressure comes into play.

From Partial pressure = Mole fraction x total pressure.

The step by step calculation is as shown in the attachment.

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3 years ago

If the [H₃O⁺] of a solution is 1.7 x 10⁻³ M, what is the pH of the solution?

vesna_86 [32]

Answer:

The pH of the solution is 2.77

Explanation:

Data obtained from the question include:

Concentration of hydronium ion, [H₃O⁺] = 1.7 x 10⁻³ M

pH =?

The pH is define as the measure of concentration of Hydrogen ion [H⁺] or hydronium [H₃O⁺] in an acid or a base. Mathematically, it is expressed as:

pH = –Log [H₃O⁺]

With the above equation, the pH can be obtained as follow:

pH = –Log [H₃O⁺]

[H₃O⁺] = 1.7 x 10⁻³ M

pH = –Log 1.7 x 10⁻³ M

pH = 2.77

Therefore, the pH of the solution is 2.77

6 0

2 years ago

Tungsten has the highest melting point of any metal. How many unpaired electrons does an atom of tungsten have in the ground sta

Natali [406]

There are four unpaired electrons in the
5d sublevel (subshell).

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3 years ago