<span>Given the same conditions of temperature and pressure the noble gas He will diffuse most rapidly. </span>He is the smallest noble gas and so it can diffuse (pass through) membranes the easiest.It is colorless, odorless, tasteless, non-toxic chemical element.
Correct answer:A
Boiling and melting points are physical properties because they do not change the chemical nature of the substance whose properties you are measuring.
The mass is the density x mass, 8.908 x 17.45 = 155.4446 g
Given :
The student looks up the value of the appendix of his textbook but cannot find a value for NaCl.
To Find :
Why the Ksp of NaCl is not present .
Solution :
Ksp values are given for those compounds which are partially soluble or insoluble in water .
But , we know NaCl is strong electrolyte and it completely dissociated in water .
So , the reaction go forward and their is no need to calculate Ksp .
Therefore , the Ksp of NaCl is not present .
Hence , this is the required solution .
Answer:
5.18.
Explanation:
<em>∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.
</em>
[OH⁻] = 1.5 x 10⁻⁹ M.
∴ [H₃O⁺] = 10⁻¹⁴/[OH⁻] = 10⁻¹⁴/(1.5 x 10⁻⁹ M) = 6.66 × 10⁻⁶ M.
∵ pH = - log[H₃O⁺]
<em>∴ pH = - log(6.66 × 10⁻⁶ M) = 5.176 ≅ 5.18.</em>