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geniusboy [140]
3 years ago
13

How many valence shell electrons does an atom of aluminum have

Chemistry
1 answer:
DedPeter [7]3 years ago
3 0
Aluminum has 3 valence electrons 
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the fact that global transfer of energy from fuels to electricity is about 35 percent efficient is most likely a consequence of
Paha777 [63]

Answer:

The second law of thermodynamics.  

Explanation:

The global transfer of energy from fuels to electricity is about 35% efficient is most likely a consequence of the second law of thermodynamics. This second law states that as energy is transformed more it is wasted, also that the entropy of a system remains constant or increase, but never decrease over time. That is why is impossible to convert heat energy to mechanical with 100 % efficiency.

Therefore, in the production of electricity, a minor part of chemical energy (from fuels) will be transformed into energy and the rest will be lost to the environment, mostly as heat, to satisfy the second law of thermodynamics.                      

 

I hope it helps you!      

7 0
2 years ago
When ammonium chloride dissolves in water, the solution becomes colder. (a) is the solution process exothermic or endothermic? (
LuckyWell [14K]
The  solution  process  is  exothermic  because  when solution  become  colder  heat  energy  is  released which  make  the process  exothermic.  The  exothermic  process  is  the  process  in  which  heat  is  released.The  solution  forms  inorder  to  separate  NH4+  ions  and  Cl-  ions
6 0
3 years ago
Molecules in all organisms are composed in part of radioactive carbon-14. Which statement best explains the presence of carbon-1
lana66690 [7]

Answer:

The correct answer is option b, that is, the radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.

Explanation:

The carbon-14 atoms, which are created by the cosmic rays associates with oxygen to produce carbon dioxide that plants captivate naturally and comprise it into plant fibers by the process of photosynthesis. Afterward, the plants are consumed by animals and human beings, thus, they take in carbon-14 as well.  

The ratio of usual carbon-12 to carbon-14 in the air and in all the living species at a particular period is almost the same. These radioactive isotopes react in a similar manner as stable isotopes in the chemical reactions in the body.  

7 0
3 years ago
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