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Oksanka [162]
2 years ago
5

Which element below is least reactive?

Chemistry
2 answers:
raketka [301]2 years ago
8 0
Generally, the least reactive elements in the periodic table are the noble gases.  The group is made up of helium, neon, argon, krypton, xenon and radon. They are unreactive because their outermost shell is composed of eight electrons, so there is no need for them to react with any other element in order to attain stability. Every other  element undergo chemical reactions in order to attain the stability of the noble gases.
jek_recluse [69]2 years ago
3 0

the answer will be helium

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The amount of dissolved gases in the body. Have a good day! =)

Explanation:

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3 years ago
A buffer solution is composed of 7.50 mol of acid and 4.75 mol of the conjugate base. If the pKa of the acid is 4.90 , what is t
Mamont248 [21]

Answer:

The correct answer is: pH= 4.70

Explanation:

We use the <em>Henderson-Hasselbach equation</em> in order to calculate the pH of a buffer solution:

pH= pKa + log   \frac{ [conjugate base]}{[acid]}

Given:

pKa= 4.90

[conjugate base]= 4.75 mol

[acid]= 7.50 mol

We calculate pH as follows:

pH = 4.90 + log (4.75 mol/7.50 mol) = 4.90 + (-0.20) = 4.70

7 0
2 years ago
A cylinder, with a piston pressing down with a constant pressure, is filled with 1.90 moles of a gas (n1), and its volume is 42.
EleoNora [17]
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V/n = k
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\frac{V1}{n1} =  \frac{V2}{n2}
V1 = 42.0 L
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substituting the values in the equation
\frac{42.0 L}{1.90 mol} =  \frac{V}{1.30 mol}
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3 0
3 years ago
A first-order reaction has a half-life of 16.7 s . How long does it take for the concentration of the reactant in the reaction t
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∴ Time = 2 × 16.7 s = 33.4 s

5 0
2 years ago
Usain Bolt went from 0.0 to<br> 11.0m/s in 3.4s. What was his<br> acceleration?
motikmotik

Answer:

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Explanation:

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7 0
2 years ago
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