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EastWind [94]
4 years ago
9

What must differ beween the atom of two different elements?​

Chemistry
2 answers:
jeyben [28]4 years ago
8 0

Answer:

<h2>They must differ by having a different amount of valence electrons.</h2>

Explanation:

Valence electrons are the outermost electrons, and most atoms must have 8 atoms to be stable (except hydrogen and helium). This is called a covalent bond. Then, once the atoms share electrons, it forms a new element, like sodium and chlorine making salt, or NaCl. Or also like water, or H2O.

kodGreya [7K]4 years ago
5 0
The number of protons must differ between two different elements
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Answer:

The answer is "V = 18.8\  L".

Explanation:

Given:

n= 0.788 \ mmol = 0.788 \ mol \ \text{(1 mmol is a thousandths of a mol)}\\\\R = 0.08206\  \frac{Latm}{Kmol}\\\\T = 17.0^{\circ}\ C =  (17.0 + 273) \ K = 290 \ K\\\\ p=1\ atm\\\\V = ?

Using idel gas law:

PV = nRT\\\ \therefore \\\\V= \frac{nRT}{P}

V =\frac{0.788 \times 0.08206 \times  290}{1}

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3 years ago
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What is the pH of a 0.0001 M aqueous solution of HCI?
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3 years ago
Calculate the pH if the [OH-] concentration is 5.9x10-1 M.
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Answers
7 0
3 years ago
For hydrocyanic acid, HCN, Ka = 4.9 × 10-10. Calculate the pH of 0.20 M NaCN. What is the concentration of HCN in the solution?
gogolik [260]
By using the ICE table :

initial    0.2 M            0           0
change -X                 + X           +X
Equ     (0.2 -X)            X               X

when Ka = (X) (X) / (0.2-X)
so by substitution:

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∴[HCN] = 10^-6

and PH = -㏒[H+]
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3 0
3 years ago
Read 2 more answers
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