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4 years ago

14

What element/compounds are used in the melting of ice?

1 answer:

Galina-37 [17]4 years ago

8 0

The temperature of the air, pavement, and the type of ice-melt compound used will affect the rate at which the ice melts. There are many different ice-melt compounds available from traditional rock salt (sodium chloride) to ice-melt pellets (calcium chloride).

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Determine the end (final) value of n in a hydrogen atom transition, if the electron starts in and the atom emits a photon of lig

Usimov [2.4K]

Complete Question

Determine the end (final) value of n in a hydrogen atom transition, if the electron starts in n=4 and the atom emits a photon of light with a wavelength of 486 nm. Group of answer choices

Answer:

$n=2$

Explanation:

From the question we are told that:

Wavelength $\lambda=486nm=>486*10^{-9}$

Generally the equation for Atom Transition is mathematically given by

$\frac{1}{\lambda}=R_{\infty }(\frac{1}{n_1^2}-\frac{1}{n_2^2})$

Where

Rydberg constant $R_{\infty}=1.097*10^7$

Therefore

$\frac{1}{486*10^{-9}}=1.097*10^7*(\frac{1}{n_1^2}-\frac{1}{4^2})$

$(\frac{1}{n_1^2}-\frac{1}{4^2})=\frac{1}{486*10^{-9}*1.097*10^7}$

$n_1^2=3.98$

$n=1.99$

$n=2$

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3 years ago

Workout the formula for:<br>Magnesium Bromide <br>Potassium Chloride

madam [21]

Magnesium bromide= MgBr2
Potassium chloride= KCl

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3 years ago

Empirical formula for 6. 63.52% Fe, 36.48% S

emmasim [6.3K]

The empirical formula for this would be FeS

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3 years ago

3. Joey pushes on a box with 15N of force to the left, and Annie pushes on the box with 18N of force to

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Answer:

3N, Right

Explanation:

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3 years ago

Convert 1.422g/cm^2 to mg/mm^2

Natalija [7]

The answer is 14.22 mg / (mm^2)

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3 years ago