Which forms of energy can be released during a chemical reaction?

Linoleic acid is a polyunsaturated fatty acid found, in ester form, in many fats and oils. Its doubly allylic hydrogens are part

Ganezh [65]

Answer:

Explanation:

Linoleic acid, which is polyunsaturated fatty acid, found

the three resonance structures are given as,

8 0

3 years ago

Calculate the change in enthalpy for the following reaction, using the bond enthalpy data provided below. (Note: you may round t

aliina [53]

Answer:

-514 kJ/mol

Explanation:

The bond enthalpy which is also known as bond energy can be defined as the amount of energy needed to split one mole of the stated bond. The change in enthalpy of a given reaction can be estimated by subtracting the sum of the bond energies of the reactants from the sum of the bond energies of the products.

For the given chemical reaction, the change in enthalpy of the reaction is:

Δ $H_{rxn} =$ [2(409) + 4(388) + 3(496) - 4(630) - 4(463)] kJ/mol = 818 + 1552 + 1488 - 2520 - 1852 = -514 kJ/mol

3 0

4 years ago

If a fast-moving car making a loud noise approaches and moves past the person, what will happen as the distance between the two

Pani-rosa [81]

Correct answer choice is :

D) The pitch of the sound being heard by the person will appear to be lower than the pitch of the source.

Explanation:

The sensation of a frequency is usually related to as the pitch of a sound. A high pitch sound relates to a high-frequency sound wave and a low pitch sound relates to a low-frequency sound wave. Whereas loudness depends on the power of the wave. In overall, the pitch is the cause behind the variation in voice quality for several people. The pitch of a sound depends on the frequency while loudness of a sound depends on the amplitude of sound waves.

5 0

3 years ago

Read 2 more answers

Ultraviolet photoelectron spectroscopy (UPS) is an important analytical tool used to characterize the composition of materials i

Setler [38]

Answer:

The equation for the Kinetic Energy, $KE_e$ , of the photo-emitted electrons is given as follows;

$KE_e = h\cdot f- BE$

Please find attached the required plot of the kinetic energy versus the frequency

Explanation:

The equation for the Kinetic Energy, $KE_e$ , of the photo-emitted electrons is given as follows;

$KE_e = h\cdot f- BE$

Where:

h = Planck's constant = 6.63×10⁻³⁴ J·s

f = Frequency

BE = Binding Energy = 2.71 eV for Calcium metal

f₀ = Threshold frequency for the material

The ionization energy is the energy required to free an electron from an isolated atom

4 0

3 years ago

Iron has many isotopes but only 4 are found in significant amounts in naturally found mixtures. The amounts by mass percent are:

AnnZ [28]

Answer:

The average mass of iron to be is 54.76 amu.

Explanation:

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$

1)

Mass of Fe-54 isotope = 53.9396 amu

Percentage abundance of Fe-54 = 5.845%

Fractional abundance of Fe-54 = 0.05845

2)

Mass of Fe-56 isotope = 55.9349 amu

Percentage abundance of Fe-56 = 91.754 %

Fractional abundance of Fe-56= 0.91754

3)

Mass of Fe-57 isotope = 56.9354 amu

Percentage abundance of Fe-57 = 2.119%

Fractional abundance of Fe-57 = 0.002119

4)

Mass of Fe-58 isotope = 57.9333 amu

Percentage abundance of Fe-58 = 0.282%

Fractional abundance of Fe-58 = 0.00282

Average atomic mass of iron :

$=53.9396 amu\times 0.05845+55.9349 amu\times 0.91754 +56.9354 amu\times 0.002119 + 57.9333 amu\times 0.00282=54.76 amu$

The average mass of iron to be is 54.76 amu.

5 0

3 years ago