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blsea [12.9K]
3 years ago
14

Give an example of one type of energy conversion (change to another form). Be sure to explain your example.

SAT
1 answer:
dimulka [17.4K]3 years ago
8 0
One type of energy change or transference is putting gas into your car because your converting chemical-energy into motion or kinetic-energy!
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Determine the empirical formula of a compound containing 47. 37 grams of carbon, 10. 59 grams of hydrogen, and 42. 04 grams of o
Effectus [21]

Considering the definition of empirical formula, the empirical formula is C₃H₈O₂ and the molecular formula is C₉H₂₄O₆.

<h3>Definition of empirical formula</h3>

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.

<h3>Empirical formula in this case</h3>

In this case, you have:

  • Carbon (C): 47.37 grams
  • Hydrogen (H): 10.59 grams
  • Oxygen (O):  42.04 grams

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

  • Carbon (C): \frac{47.37 grams}{12 \frac{g}{mole} }= 3.95 moles
  • Hydrogen (H): \frac{10.59 grams}{1 \frac{g}{mole} }= 10.59 moles
  • Oxygen (O):  \frac{42.04 grams}{16 \frac{g}{mole} }= 2.63 moles

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

  • Carbon (C): \frac{3.95 moles}{2.63 moles }= 1.5
  • Hydrogen (H): \frac{10.59 moles}{2.63 moles }= 4
  • Oxygen (O):  \frac{2.63 moles}{2.63 moles }= 1

Finally, since in the empirical formula the numbers of moles must be expressed in whole numbers, the ratio of atoms is multiplied by some number with which everything is obtained in simple whole numbers (in this case by 2):

  • Carbon (C): 1.5× 2= 3
  • Hydrogen (H): 4× 2= 8
  • Oxygen (O):  1× 2= 2

Therefore the C: H: O mole ratio is 3: 8: 2

Finally, the empirical formula is C₃H₈O₂.

<h3>Molecular formula</h3>

To obtain the molecular formula you must relate its molecular weight (PMc) with the molecular weight of the empirical formula (PMfe).

PMfe= PM (C₃H₈O₂)= 76 g/mole

The molar mass of the compound (PMc) was determined to be 228.276 g/mol. Dividing this mass PMc by the molar mass of the empirical formula PMfe gives:

228.276 g/mol ÷ 76 g/mole= 3

This means that in the molecular formula there are 3 unit formulas (empirical formulas), so it is necessary to multiply the number of all atoms by 3.

Then, the molecular formula is C₉H₂₄O₆.

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2 years ago
Which of the following is a hazard associated with driving at high speeds?
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B. small steering gestures cause exaggerated motions.
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A student is working full-time (at least 40 hours a week) and is also starting
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Not more than 7 credit hours

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Though the credit hours varies by institution, the standard for most institution is 3 - 6 hours for working class students.

From the list of given options, the closest to 3-6 hours is "not more than 7 hours"; hence, option D answers the question.

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which reconstruction amendment was intended to protect freedmen against the injustices depicted in this cartoon?
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The Fifteenth reconstruction amendment (1869) was intended to protect freedmen against the injustices depicted in this cartoon.

In 1869, Congress passed a constitutional amendment guaranteeing black suffrage.

The Civil War Amendments, often known as the Reconstruction Amendments, are the Thirteenth, Fourteenth, and Fifteenth Amendments to the United States Constitution, which were ratified between 1865 and 1870.

The Thirteenth Amendment (1864)  outlawed slavery and involuntary servitude.

The Fourteenth Amendment (1866) emphasizes citizenship rights and equal legal protection for all people.

The Fifteenth Amendment (1869) forbids discrimination in citizens' voting rights based on "race, color, or prior condition of servitude."

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_____, one of the greatest writers in history, emerged during the Renaissance.
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Williaam shakespeare

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