Hi, does anyone want to be friends ?

Chemistry

1 answer:

Olegator [25]2 years ago

5 0

Answer:

sure sure

Explanation:

You might be interested in

Will mark brainliest. What is the main function of the circulatory system in multicellular organisms?

just olya [345]

Answer:

D: to transport materials through the body.

Explanation:

A: to bring oxygen into the lung. is incorrect because it's respiratory system

B: to put carbon dioxide into all the blood vessels carbon dioxide is exhaled out of the body

C: to expel waste products from the body. is excretory system

4 0

2 years ago

Which of the following is unchanged at the end of the CNO cycle?

Musya8 [376]

Answer:

The correct option is: A. carbon-12

Explanation:

The CNO cycle, the abbreviation for the carbon-nitrogen-oxygen cycle, is a catalytic cycle by which the stars produce helium from elemental hydrogen, via a series of nuclear fusion reactions.

This cycle involves the fusion of four protons with carbon ( $_{6}^{12}\textrm{C}$ ), nitrogen isotope ( $_{7}^{13}\textrm{N}$ ), and oxygen isotope ( $_{8}^{15}\textrm{O}$ ), to give an alpha particle and two electron neutrinos and positrons.

The reaction involves the regeneration of carbon ( $_{6}^{12}\textrm{C}$ ) nucleus in the last step.

$_{6}^{12}\textrm{C}$ → $_{7}^{13}\textrm{N}$ → $_{6}^{13}\textrm{C}$ → $_{7}^{14}\textrm{N}$ → $_{8}^{15}\textrm{O}$ → $_{7}^{15}\textrm{N}$ → $_{6}^{12}\textrm{C}$