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iren2701 [21]
3 years ago
10

How does the line spectra are used to identify elements and what they indicate about atoms?

Chemistry
1 answer:
olga nikolaevna [1]3 years ago
3 0
<span>we know that each element has an unique spectra and it can be used to identify the element. it shows that the energy levels of the electrons and different colors are the result of different wavelengths.
hope it helps
</span>
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How many kilowatt-hours of electricity are used to produce 4.50 kg of magnesium in the electrolysis of molten mgcl2 with an appl
ratelena [41]
First, we need to determine the half reaction of magnesium. It would be expressed as:

Mg2+ + 2e- = Mg

Given the mass of magnesium metal that is produced, we calculate the total charge of the electrolysis by the relations we can get from the half reaction. We do as follows:

4.50 kg Mg ( 1000 g / 1 kg ) ( 1 mol / 24.305 g ) ( 2 mol e- / 1 mol Mg ) ( 96500 C / 1 mol e- ) = 35733388.2 C

We are given the applied EMF in units of V. This value is equal to J/C. So, 5 V is equal to 5 J/C.

35733388.2 C (5 J/C) = 178666941 J
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3 years ago
A sample of CH4 is confined in a water manometer. The temperature of the system is 30.0 °C and the atmospheric pressure is 98.70
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Explanation:

The given data is as follows.

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      height (h) = 30 mm = 0.03 m (as 1 m = 100 mm)

Density = 13.534 g/mL = 13.534 g/mL \times \frac{10^{6}cm^{3}}{1 m^{3}} \times \frac{1 kg}{1000 g}

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The relation between pressure and atmospheric pressure is as follows.

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Putting the given values into the above formula as follows.

            P = P_{atm} + \rho gh

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8 0
3 years ago
Helium, neon, and argon are examples of
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C) Noble gases
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Answer:

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Explanation:

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