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jolli1 [7]
3 years ago
15

A) Suggest one possible reason for the general trend indicated on the graph between 1910 and 2000.?

Chemistry
2 answers:
matrenka [14]3 years ago
8 0
One possible reason for the general tread could be the rise in population and the need to sustain oil production for items and objects dependent upon oil or creation or operation. 

It may be sustainable due do the dependence on oil already... Yet could change at any minute due to the use of anything new. 

Well, becoming more ecological in nature. Using less plastic and recycling more, getting off of conventional cars, getting more educated about even more techniques. 

I hope that may help, if not, just tell me. :D 
sleet_krkn [62]3 years ago
6 0

A) One possible reason for the trend that we see (an increase in the number of barrels of oil produced) could be the fact that population has also risen significantly since 1910. Moreover, we have also increased our reliance on oil products, such as gasoline and plastic.

B) This trend is not sustainable because of two reasons. First, oil is a non-renewable resource, which means that there is only a limited quantity of it. We will eventually run out of oil. Another reason is that the use of oil greatly pollutes the environment and contributes to global warming, which threatens to destroy the world as we know it.

C) There are several possible strategies. We could use electric cars as opposed to regular ones. We could also reduce our reliance on plastic products.

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Answer:

M *=* ml / M

Explanation:

2230 / 3.0 = 743.3

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Write the electronic configuration of Cr^2+ (z=24) and predict the number of electrons having n+1 value equal to 3
leonid [27]

Answer:

(a) Cr²⁺: 1s² 2s²2p⁶ 3s²3p⁶ 3d⁴; (b) eight  

Explanation:

(a) Electron configuration of Cr

(i). Locate chromium in the Periodic Table.

It's Element 24, so  in Period 4, Group 3.

(ii). Write its electron configuration

Remember that Cr is one of those exceptions to the Aufbau principle.

Instead of the predicted electron configuration of [Ar] 4s²3d⁴, we get the configuration [Ar] 4s3d⁵.

The reason is that this this configuration minimizes electron repulsion.

(b) Write the electron configuration for Cr²⁺.

Now, we must remove two electrons from a chromium atom.

The electron in the 4s orbital is removed first, because this orbital is further from the nucleus, making electrons easier to remove.

So, we remove the 4s electron, and  then a 3d electron.

The electron configuration of Cr²⁺ is

[Ar]3d⁴ or 1s² 2s²2p⁶ 3s²3p⁶ 3d⁴

(c). Electrons with n + l = 3

The orbitals with n + l = 3 are those covered by the third arrow down in the order of orbital energies:

2p (n = 2, l = 1) and 3s (n = 3, l = 0)

The 2p orbitals can hold six electrons, and the 3s orbital can hold two.

Both subshells are filled in a Cr²⁺ ion, so there are eight electrons

with n+ l = 3.

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