A ------------ ----------------- is the dying out of a large number of species on a global scale

Chemistry

1 answer:

ziro4ka [17]3 years ago

5 0

Answer:

Extinction event or sometimes known as Mass extinction

Explanation:

These events typically are typically widespread and rapid decrease in the biodiversity (which takes into account spread and existence of current species). The worst mass extinction was Permian–Triassic extinction where over 90% of species of organisms vanished.

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In which main energy level does the 'd' sublevel first appear? K (first main energy level) L (second main energy level) M (third

RoseWind [281]

Answer:

M (third main energy level)

Explanation:

The third main energy level bears the first appearance of the 'd' sublevel. The principal quantum number(n) depicts the main energy levels in which an orbital is located. It takes values of n=1,2,3,4,5..... and it can be represented by the shells k,l,m,n.......

The subshells in these main orbitals are represented by s,p,d and f. For the K shell, the principal quantum number is m and its sublevel notations are s,p and d. This is where the d-sublevel first appears.

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describe how astronomers are able to use the light from a distant star to determine what elements make up the stars.

dlinn [17]

Answer:

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A 5.0-gram sample of Fe(s) is to be placed in 100. milliliters of HCl(aq). Which changes will result in the fastest rate of reac

sveta [45]

The answer is <span>increasing the surface area of Fe(s) and increasing the concentration of HCl(aq).

the rate of reaction can be increased if the interaction between the reactants in better. by increasing the surface area of a solid, such as Fe, you make more possible each molecule of Fe to interact with HCl. Also, by increasing the concentration of HCl, it mean there is more molecule of HCl to interact with Fe.</span>

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why don't we ever see solid or liquid oxygen on earth?

NeTakaya

Please mark me brainiest!

The reason why you don’t see solid or liquid oxygen is because oxygen is a natural occurring gas. Gas can not be solid or liquid because there is too much energy to have volume/shape. That’s why you see oxygen tanks, as the tank keeps the gas contained and that is why you can’t see it in the air outside or in something like H20 (water).

Hope this helps :)

Just don’t open the link in the other answer. It’s a scam...

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Nadusha1986 [10]

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