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3 years ago

How do you dispose of an unknown chemical

Chemistry

1 answer:

melisa1 [442]3 years ago

6 0

The chemical contractor has to retrieve the chemical and a identification analysis would have to be conducted

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A blu-ray laser has a wavelength of 405nm. In what region of the electromagnetic spectrum is this radiation? What is its frequen

love history [14]

Answer:

It lies in in the visible region.

Frequency: is 7.407 × 10^-14 Hz

${ \bf{V = f \lambda}} \\ { \tt{3.0 \times {10}^{8} = f \times (405 \times {10}^{ - 9}) }} \\ { \tt{f = 7.407 \times {10}^{14} \: hertz}}$

Explanation:

V is speed of light.

f is frequency

lambda is the wavelength

8 0

2 years ago

How have chemists changed our daily lives the most

sladkih [1.3K]

By using what they know to produce new and helpful products

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3 years ago

How much energy does an X-ray with an 8 nm (8 x 10-9 m) wavelength have?

Vlada [557]

Answer: 2.48×10^-17 J

Explanation:

Given the following :

Wavelength = 8nm (8 x 10^-9 m)

Energy(e) of X-ray =?

Energy=[speed of light(c) × planck's constant (h)] ÷ wavelength

Speed of light = 3×10^8m/s

Planck's constant = 6.626×10^-34 Js

Wavelength = 8 x 10^-9 m

Energy = [(3×10^8) * (6.626×10^-34)] / 8 x 10^-9

Energy = [19.878×10^(8-34)] / 8 x 10^-9

Energy = 2.48475 × 10^(-26+9)

Energy = 2.48×10^-17 J

8 0

2 years ago

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Diano4ka-milaya [45]

Answer:

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5 0

2 years ago

What can be added to an atom to cause a nonvalence electron in the atom to temporarily become a valence electron?

vazorg [7]

Answer:

What can be added to an atom to cause a nonvalence electron in the atom to temporarily become a valence electron is energy.

Explanation:

The normal state of the atoms, where all the electrons are occupying the lowest possible energy level, is called ground state.

The valence electrons are the electrons that occupy the outermost shell, this is the electrons in the highest main energy level (principal quantum number) of the atom.

So, a nonvalence electron occupies an orbital with less energy than what a valence electron does; in consequence, in order to a nonvalence electron jump from its lower energy level to the higher energy level of a valence electron, the former has to absorb (gain) energy.

This new state is called excited state and is temporary: the electron promoted to the higher energy level will emit the excess energy, in the form of light (photons), to come back to the lower energy level and so the atom return to the ground state.

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3 years ago

Read 2 more answers