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GalinKa [24]
3 years ago
5

a nickel atom (atomic symbol Ni) has an atomic number of 28 and has an atomic mass of 59. how many neutrons does it have ??

Chemistry
1 answer:
shusha [124]3 years ago
8 0

Answer: 31 neutrons

Explanation:

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The molecular weight of H 2 SO 4 is:<br><br> 49.078 g/mole<br> 98.086 g/mole<br> 194.296 g/mole
romanna [79]

Answer:

the molecular weight of H2SO4 is 98.086g/mole

8 0
3 years ago
21 Organs consist of cells and tissues that have been adapted to perform a specific function in living organisms. The stomach is
Tanya [424]

Answer:

The correct answer is - D.  It gets rid of pathogens that invade the body.​

Explanation:

Like all other organ systems, the immune system is an organ system that involves several special organs that helps in fighting any foreign object or infection that invades our body. This organ system produces specific cells or chemicals to fight or kill the microbes, and unnatural change takes place in the body.

The organs involved in the immune system are lymphocytes or white blood cells, the complement system, antibodies, the lymphatic system the thymus, bone marrow, and the spleen.

All these combinedly helps in fighting, killing the microbes or infections that occur in the body, and correct the physiological changes that occur in the body to get rid of pathogens that invade the body.

5 0
3 years ago
Dinitrogentetraoxide partially decomposes into nitrogen dioxide. A 1.00-L flask is charged with 0.0400 mol of N2O4. At equilibri
artcher [175]

Answer:

Keq=0.866

Explanation:

Hello,

In this case, the undergone chemical reaction is:

N_2O_42NO_2

In such a way, since 0.0055 mol of N₂O₄ remains in the flask, one infers that the reacted amount (x) was:

x=0.04mol-0.0055mol=0.0345mol

In addition, the produced amount of NO₂ is:

2*0.0345mol=0.069mol

Finally, considering the flask's volume, the equilibrium constant is then computed as follows:

Keq=\frac{(2*0.0345M)^2}{0.0055M}=0.866

Best regards.

6 0
3 years ago
Which indicator shows whether a solution is acidic or basic, but not how strong it is?
Galina-37 [17]

Answer:

Option C

Explanation:

Litmus paper shows only whether the solution is acidic or basic, but not how strong it is.

=> Base turns the red litmus paper blue

=> Acid turns the blue litmus paper red.

5 0
3 years ago
Read 2 more answers
Chemical bonds form because: a. The atoms have more energy bonded together than separated b. The atoms have less energy bonded t
MrMuchimi

Answer:

A. The atoms have more energy together than separated.

Explanation:

There are several reasons why a chemical bond could take place. Adding things like heat or pressure stimulate the atoms to force a reaction to take place. But when it comes down to it, the intramolecular forces of the electrons  pull each other to form chemical bonds (represented by Valence electrons). The stronger these are, the more likely they are going to bond.

Atoms with lower forces typically don't typically bond with other atoms of lower forces.

6 0
3 years ago
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