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3 years ago

15

What is the meaning of "Laser"

2 answers:

iVinArrow [24]3 years ago

8 0

<span>A device that generates an intense beam of coherent monochromatic light (or other electromagnetic radiation) by stimulated emission of photons from excited atoms or molecules. Lasers are used in drilling and cutting, alignment and guidance, and in surgery; the optical properties are exploited in holography, reading bar codes, and in recording and playing compact discs.</span>

Lena [83]3 years ago

8 0

It is actually an acronym that means "Light Amplification of Stimulated Emission of Radiation"

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What electrolyte may fall in level as a result of citrate toxicity from massive transfusion quizlket

vovangra [49]

Potassium Recipients of massive transfusions may therefore develop electrolyte disturbances, with hypocalcemia, hypomagnesemia, and hyperkalemia most commonly reporte

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3 years ago

At STP, what is the volume of 5.13 mol of nitrogen gas? Answer in units of L.

Gre4nikov [31]

Answer: $114.91L$

Explanation:

You need to know the conversion factor first in order to solve this. Any gas occupies 22.4L per mol.

$5.13mol(\frac{22.4L}{1mol})= 114.91L$ of nitrogen gas.

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3 years ago

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3 years ago

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3 years ago

Read 2 more answers

Monochloroacetic acid (HC2H2ClO2) is a skin irritant that is used in "chemical peels" intended to remove the top layer of dead s

yaroslaw [1]

<u>Answer:</u> The pH of the solution is 1.703

<u>Explanation:</u>

We are given:

Concentration of monochloroacetic acid = 0.31 M

The chemical equation for the dissociation of monochloroacetic acid follows:

$HC_2H_2ClO_2\rightleftharpoons H^++C_2H_2ClO_2^-$

<u>Initial:</u> 0.31

<u>At eqllm:</u> 0.31-x x x

The expression of $K_a$ for above equation follows:

$K_a=\frac{[H^+][C_2H_2ClO_2^-}}{[HC_2H_2ClO_2]}$

We are given:

$K_a=1.35\times 10^{-3}$

Putting values in above equation follows:

$1.35\times 10^{-3}=\frac{x\times x}{(0.31-x)}\\\\x=-0.021,0.0198$

Neglecting the negative value of 'x' because concentration cannot be negative.

To calculate the pH of the solution, we use the equation:

$pH=-\log[H^+]$

$pH=-\log (0.0198)\\\\pH=1.703$

Hence, the pH of the solution is 1.703

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4 years ago