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3 years ago

[15 points] please help!!

Chemistry

2 answers:

Nitella [24]3 years ago

4 0

I'm pretty sure it's the entertainment industry.

Rufina [12.5K]3 years ago

4 0

Answer:

The correct answer is D. The industry that was created when people suddenly had more time and money available is the entertainment industry.

Explanation:

It is called entertainment industry or showbusiness to the set of companies and institutions whose main economic activity is the production of culture with a profit purpose.

There can be considered means of cultural production: the television, the radio, the newspapers and magazines, the cinema, the videogames, the publishers, theater, dance and music.

All these means are elaborated looking at the same time to increase the consumption of cultural objects, and to modify the social habits, educate or inform.

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Identify the products in the reaction HCI + NaOH → NaCl + H20.

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Kind of protists can live in groups with different individuals performing different jobs (site 1)

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3 years ago

A label on an empty sample container reads 12. 00 g. you add in a sample of a compound and mass the sample container obtaining 1

Goryan [66]

The mass of the substance is the quantitative measure of the physical object. The mass of the sample must be reported as 3.5465 g. Thus, option e is correct.

The mass of the substance is the quantity of matter that the sample weighs and is reflected in grams or kilograms.

Given,

Mass of empty sample container = 12.00 g

Mass of sample + empty container = 15.5465 g

The mass of the sample will be given as,

mass of sample = (Mass of sample + empty container) - ( Mass of empty container)

= (15.5465 g - 12.00g)

=3.5465 g

Therefore, 3.5465 gm is the mass of the sample, and the correct option is e.

Your question is incomplete, but most probably your full question was, A label on an empty sample container reads 12.00 g. you add in a sample of a compound and the mass of the sample container obtaining 15.5465 g. what should the mass of the sample be reported as?

3.546 g
3.54 g
4 g
4.0 g
3.5465 g

Learn more about mass here:

brainly.com/question/17270802

#SPJ4

8 0

2 years ago

The clectron in a hydrogen atom, originally in level n=9, undergoes a transition to a lower level by emitting a photon

Andreas93 [3]

Explanation:

The given data is as follows.

$n_{1}$ = 9, $n_{2}$ = ?

Z for hydrogen = 1

As we know that,

Energy (E) = $\frac{hc}{\lambda}$

where, h = planck's constant = $6.626 \times 10^{-34}$ Js

c = speed of light = $3 \times 10^{8}$ m/s

$\lambda$ = wavelength

According to Reydberg's equation, we will calculate the energy emitted by the photon as follows.

$\Delta E = -2.179 \times 10^{-18} J \times (Z)^{2}[\frac{1}{n^{2}_{2}} - \frac{1}{n^{2}_{1}}]$

or, $\frac{hc}{\lambda}$ = $-2.179 \times 10^{-18} J \times (Z)^{2}[\frac{1}{n^{2}_{2}} - \frac{1}{n^{2}_{1}}]$

Putting the given values into the above equation as follows.

$\frac{hc}{\lambda}$ = $-2.179 \times 10^{-18} J \times (Z)^{2}[\frac{1}{n^{2}_{2}} - \frac{1}{n^{2}_{1}}]$

$\frac{6.626 \times 10^{-34} Js \times 3 \times 10^{8}m/s}{384 \times 10^{-9} m}$ = $-2.179 \times 10^{-18} J \times (1)^{2}[\frac{1}{n^{2}_{2}} - \frac{1}{(9)^{2}}]$

n = 2

Thus, we can conclude that the final level of the electron is 2.

5 0

3 years ago