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3 years ago

Is Fe + S a mixture, compound, or element?

Chemistry

1 answer:

melomori [17]3 years ago

8 0

Answer:Mixture

Explanation:Doesn’t specify the proportions of the solution so it can’t be a compound, and iron and sulfur are two separate elements.

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Answer:

a and d

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2 years ago

A car travels 65 miles in 1 hour. What is the average speed of the car?

ohaa [14]

It would be 65 miles per hour

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2 years ago

Thermal energy always moves from ___ to ___

Inessa05 [86]

Answer:

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3 years ago

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15A.4(a) What is the temperature of a two-level system of energy separation equivalent to 400 cm−1 when the population of the up

maksim [4K]

Answer:

T = 525K

Explanation:

The temperature of the two-level system can be calculated using the equation of Boltzmann distribution:

$\frac{N_{i}}{N} = e^{-\Delta E/kT}$ (1)

where Ni: is the number of particles in the state i, N: is the total number of particles, ΔE: is the energy separation between the two levels, k: is the Boltzmann constant, and T: is the temperature of the system

The energy between the two levels (ΔE) is:

$\Delta E = hck$

where h: is the Planck constant, c: is the speed of light and k: is the wavenumber

$\Delta E = 6.63\cdot 10^{-34} J.s \cdot 3\cdot 10^{8}m/s \cdot 4 \cdot 10^{4}m^{-1} = 7.96 \cdot 10^{-21}J$

Solving the equation (1) for T:

$T = \frac{-\Delta E}{k \cdot Ln(N_{i}/N)}$

With Ni = N/3 and k = 1.38x10⁻²³ J/K, the temperature of the two-level system is:

$T = \frac{-7.96 \cdot 10^{-21}J}{1.38 \cdot 10^{-23} J/K \cdot Ln(N/3N)} = 525K$

I hope it helps you!

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3 years ago

If the number of atoms of each element in the products equals the number of atoms of each element in the reactant the equation i

Misha Larkins [42]

Answer: The correct answer is Option b.

Explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another. Every balanced chemical equation follows law of conservation of mass.

This also states that total number of atoms of each element on the reactant side must be equal to the total number of atoms of each element on product side.

From the above information, the correct answer is Option b.

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3 years ago

Read 2 more answers