3 years ago

What is a pure substance that cannot be chemically broken down into simpler substances?

Chemistry

1 answer:

SCORPION-xisa [38]3 years ago

3 0

I believe it is A compound

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Andrej [43]

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Given the following formula for calculating the ionization energy of one-electron species such as Li2+, He+, and H, calculate th

Yuki888 [10]

Answer:

The answer is " $32819.9 \ \frac{J}{mol}\\\\$ "

Explanation:

$Boron: 5^{B}\to 1s^2 2s^2 2p^1$

$\Delta E=-2.18\times 10^{-18}\ \frac{J}{atom}\ (\frac{1}{\infity^2}-\frac{1}{n^2_{initial}})(z^2) (6.022\times 10^{23}\ \frac{atom}{mol})\\\\$

$=-2.18\times 10^{-18}\ \frac{J}{atom}\ (0-\frac{1}{1})(5^2) (6.022\times 10^{23}\ \frac{atom}{mol})\\\\ =2.18\times 10^{-18}\times 25 \times 6.022\times 10^{23}\ (\frac{J}{mol})\\\\ =328.199 \times 10^{5}\ (\frac{J}{mol})\\\\ =32819 \times 10^{3}\ (\frac{J}{mol})\\\\ =32819.9 \ (\frac{J}{mol})\\\\$

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3 years ago

A train travels at a speed of 80 mph. How far does the train travel in 2 h 42 min?<br> miles

VikaD [51]

2h 42m = (2+42/60)h = 2.7h
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3 years ago

How many excited electron in the atom with an electron configuration of [kr]5s24d55p6 ?

IRISSAK [1]

The ground-state electronic configuration follows the order of orbitals as shown in the first picture. So, we can deduce that the electronic configuration given is in order. However, each orbital must have a maximum number of electrons to be filled before it can move on to the next orbital. Since the d orbital must hold 10 electrons, that means that it should have held 5 electrons more. The missing 5 electrons were excited to the next 5p orbital. <em>Thus, there are 5 excited electrons.</em>

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3 years ago

URGENT i need this fast

erastovalidia [21]

Less than 250,000 joules

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3 years ago