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3 years ago

7

Why are coal, oil, and natural gas called fossil fuels?

2 answers:

horrorfan [7]3 years ago

7 0

<span>Coal, oil and natural gas are are called fossil fuels because they are composed of the remains of organisms that lived as long as 500 million years ago. These organisms, such as phytoplankton, became incorporated into the bottom sediments and then were converted, with time, to oil and gas.</span>

sergeinik [125]3 years ago

6 0

Because that's where they come from. Coal, oil, and natural gas are the products
of dead dinosaurs rotting in the ground under great pressure for millions of years.

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What is the effect of photosynthesis in the carbon dioxide cycle

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3 years ago

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What is Fe + O2 → Fe2O3 balanced?

ikadub [295]

<span>4 Fe(s) + 3 O2(g) = 2 Fe2O3(s)
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3 years ago

the process of separating a liquid/solid mixture by slowly pouring the liquid component into a new vessel as the solid settles t

olga55 [171]

The process involving separation of liquid/solid mixture as regards this question is Decantation.

Decantation can be regarded as one of the process used in separation of liquid from solid as well as other immiscible (non-mixing) liquids through the removal of the liquid layer that is present at the top from the layer of solid/liquid which present at the below.

In the process, the liquid will be poured slowly into another vessel as the pouring continues, then the solid will settle in the original vessel.

This process can be done through tilting the mixture after the the top layer have been poured out.

<em>Therefore, decantation is one of the separation technique.</em>

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2 years ago

In the reaction Zn + CuSO₄ → Cu + ZnSO₄

lisabon 2012 [21]

The given question is incomplete. The complete question is:

In the reaction $Zn+CuSO_4\rightarrow Cu+ZnSO_4$ , identify the oxidizing and reducing agent.

Answer: reducing agent. : Zn

oxidizing agent : $CuSO_4$

Explanation:

Oxidation reaction : When there is an increase in oxidation state number.

Reduction reaction : when there is a decrease in oxidation state number.

Zinc metal has undergone oxidation, as its oxidation state is changing from 0 to 2+. Zinc metal is getting converted into zinc ions.

$Cu^{2+}$ ions has undergone reduction, as its oxidation state is changing from +2 to 0. Copper ions are getting converted into copper metal.

The chemical agent which itself get oxidized and reduce others is called reducing agent. $Zn$ is a reducing agent.

The chemical agent which itself get reduced and oxidize others is called oxidizing agent. $CuSO_4$ is an oxidizing agent.

7 0

3 years ago

Select the electronic transition for a hydrogen atom that are either ultraviolet absorption or ultraviolet emissions

Triss [41]

There are following transition series in case of hydrogen spectrum

a) Lyman series : it is when electron transit from n1= 2 to n2= 3,4 ,5 .....

It falls in UV region

b) Balmer series : it is when electron transit from n1= 2 to n2= 3,4 ,5 .....

It falls in visible region

c) pachen series : it is when electron transit from n1= 3 to n2= 4 ,5 .....

It falls in IR band

d) Brackett : it is when electron transit from n1= 4 to n2= 5,6,7 .....

It falls in Ir band

and so on

As asked we have assign ultraviolet absorption : n1 = 1 to n1= 2,3,4,5

ultraviolet emission: n2 = 2,3,4,5..... to n1= 1

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3 years ago