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Yakvenalex [24]
3 years ago
9

Match the term to its description

Chemistry
1 answer:
NeTakaya3 years ago
4 0

<u>Answer :</u>

Chemical energy - D) Potential energy stored in the bonds between atoms

Electrical energy - C) The movement of an electrical charge

Radiant energy - B) Electromagnetic energy that travels in waves

Thermal energy - A) Internal energy caused by vibrations of atoms and  molecules

<u>Explanation :</u>

Chemical energy : It is the type of energy in which the potential energy is stored in the bonds between the atoms.

Electrical energy : It is a type of energy in which the electrical charge are moved.

Radiant energy : It is a type of energy in which the electromagnetic energy travels in the waves.

Thermal energy : It is a type of energy in which an internal energy caused by the vibrations of atoms and the molecules.

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A compound has been shown to contain 14.5 percent hydrogen and 85.5 percent carbon by mass.
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  • <em>Option d. Its empirical formula is CH</em><em>₂</em><em>.</em>

Explanation:

The percent composition of the compound allow you to calculate the empirical formula of the compound but is not enough to calculate either the molar mass or the molecular formula. So, since now you can discard options b. and c.

Telling that it is a hydrocarbon (option e.) is true but very vague compared with finding the empirical formula. So, you can also discard the option e.

The fact that the product has a triple bond cannot be concluded from the percent composition, you should find the molecular formula to assert whether it contains or not a triple bond. So, you could discard option a., which lets you only with choice d.

Let us find the empirical formula to be certain that it is CH₂.

1.  <u>First, assume a basis of 100 g of compound</u>:

  • H: 14.5% × 100 g = 14.0 g
  • C: 85.5% × 100 g = 85.5 g

2. <u>Divide each element by its atomic mass to find number of moles</u>:

  • H: 14.0 g / 1.008 g/mol = 14.38 mol
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3. <u>Divide both amounts by the smallest number, to find the mole ratio</u>:

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  • C: 7.12 mol / 7.12 mol = 1.

Hence, the ratio is 2:1 and the empirical formula is CH₂.

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