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laiz [17]
3 years ago
7

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

Chemistry
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 do electric forces do​
Oksana_A [137]

Answer:

An electric force is exerted between any two charged objects. Objects with the same charge, both positive and both negative, will repel each other, and objects with opposite charges, one positive and one negative, will attract each other.

Explanation:

3 0
3 years ago
Identify the NMR term that corresponds to each description.
balandron [24]

Answer:

A- upfield

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Explanation:

NMR is a spectroscopic technique commonly used to observe the magnetic fields around the nucleus of atoms in a compound under investigation.

A chemical shift is the difference in parts per million (ppm) between the resonance frequency of the observed protons in the compound under study and that of the tetramethylsilane (TMS) (the reference compound in NMR with a chemical shift of zero ppm because all protons in the compound are equivalent).

If signals appear close to the reference signal, the signals are said to appear upfield. If the signals appear far away from the reference, they are said to appear down field.

The presence of protons cause splitting of peaks to the magnitude of n+1. n is the number of neighboring protons. Splitting refers to the appearance of multiple peaks for a single nucleus due to neighboring nuclei.

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3 years ago
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stiv31 [10]
The correct answer is option B. The most dense phase of matter is the solid phase and the least dense are gases. However, there is an exception. Water is the exception. Solid water or ice is less dense than the liquid phase therefore it floats on liquid water.
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4. Rubidium

I believe :)

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