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Elis [28]
2 years ago
13

Someone please help will mark as brainliest

Chemistry
1 answer:
Karo-lina-s [1.5K]2 years ago
3 0

Answer:

PET works by using a scanning device (a machine with a large hole at its center) to detect photons (subatomic particles) emitted by a radionuclide in the organ or tissue being examined.

Newer technology combines PET and CT into one scanner, known as PET/CT. PET/CT shows particular promise in the diagnosis and treatment of lung cancer, evaluating epilepsy, Alzheimer's disease and coronary artery disease.

Explanation: Most Brainliest Please

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A 4.215 g sample of a compound containing only carbon, hydrogen, and oxygen is burned in an excess of oxygen gas, producing 9.58
Scilla [17]

Answer:

\% O=27.6\%

Explanation:

Hello,

In this case, for the sample of the given compound, we can compute the moles of each atom (carbon, hydrogen and oxygen) that is present in the sample as shown below:

- Moles of carbon are contained in the 9.582 grams of carbon dioxide:

n_C=9.582gCO_2*\frac{1molCO_2}{44gCO_2}*\frac{1molC}{1molCO_2}  =0.218molC

- Moles of hydrogen are contained in the 3.922 grams of water:

n_H=3.922gH_2O*\frac{1molH_2O}{18gH_2O} *\frac{2molH}{1molH_2O} =0.436molH

- Mass of oxygen is computed by subtracting both the mass of carbon and hydrogen in carbon dioxide and water respectively from the initial sample:

m_O=4.215g-0.218molC*\frac{12gC}{1molC} -0.436molH*\frac{1gH}{1molH} =1.163gO

Finally, we compute the percent by mass of oxygen:

\% O=\frac{1.163g}{4.215g}*100\% \\\\\% O=27.6\%

Regards.

5 0
3 years ago
Explain the difference between a front and an air mass.
iVinArrow [24]

Answer: The differences is Air masses cover over thousands and hundreds and millions of square kilo. A front is a boundary which two air masses but different temperature and moisture content meet.

Explanation:

8 0
2 years ago
Which statement best explains the process occurring in step 4 of the life<br>cycle?​
Marat540 [252]

Answer:

Which statement best compares a eukaryote and a prokaryote?  

A. Eukaryotes have a cell wall, while prokaryotes have a cell membrane.

*B. Eukaryotes have membrane-bound organelles, while prokaryotes have few specialized  

structures.

C. Eukaryotes use active transport to move substances across the cell membrane, while  

prokaryotes use facilitated diffusion.

D. Eukaryotes use flagella to move themselves through substances, while prokaryotes are not  

able to move.

Explanation: its B

5 0
3 years ago
What is meant by the statement ' protential difference between point A and Point B in an electric circuit is 1 V' ?​
liubo4ka [24]

Answer:

The potential difference is considered as the change in terms of voltage or Del V. It is measured in terms of voltage so that statement got the name voltage change between point A & B is 1. It means that I joule of work is carried out for moving the 1 coulomb of charge from the point A to B.

7 0
2 years ago
Plsss help ASAP Dont guess
alexira [117]

Answer:

B

Explanation:

5 0
2 years ago
Read 2 more answers
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