Answer:
The balanced chemical equation: NH₃ + 2 HF → NH₄⁺ + HF₂⁻
Explanation:
According to the Brønsted–Lowry acid–base theory, the acid- base reaction is a type of chemical reaction between the acid and base to give a conjugate acid and a conjugate base.
In this reaction, a Brønsted–Lowry acid loses a proton to form a conjugate base. Whereas, a Brønsted–Lowry base accepts a proton to form a conjugate acid.
Acid + Base ⇌ Conjugate Base + Conjugate Acid
The acid dissociation constant (Kₐ) <em>signifies the acidic strength of a chemical species.</em>
∵ pKₐ = - log Kₐ
Thus for a strong acid, Kₐ value is large and pKₐ value is small.
pKₐ (HF) = 3.2 → strong acid
pKₐ (NH₃) = 38 → weak acid
<u>The chemical reaction involved in the dissolution process:</u>
NH₃ + 2 HF → NH₄⁺ + HF₂⁻
In this acid-base reaction, the acid HF reacts with NH₃ base to give the conjugate base HF₂⁻ and conjugate acid NH₄⁺.
<u>HF (acid) donates a proton to form the conjugate base, HF₂⁻ ion. NH₃ (base) accepts a proton to form the conjugate acid. </u>
The correct answer would be the third option. The chemical properties cycle through each period because the atoms' outermost shells having two or more electron shells cannot have more than eight electrons. This is following the octet rule.
Answer:
The air pressure on a hot day is higher than on a cold day
Explanation:
In tire having constant volume, the air pressure on hot day is greater compared to that on a cold day.
From the combined gas law, at constant volume, it can be deduced that the pressure of a given mass of gas varies directly with the absolute temperature.
Mathematically;
=
So, it can be inferred that the higher the temperature of the tire, the more the pressure on the air inside and vice versa.
Explanation:
number of particles or atom = number of moles × Avogadro's number
number of atoms = 12.34 × 6.02 × 10^23
= 7.43 × 10^24 atoms
The ratio would be 1 : 8. This is because 15 divided by 15 = 1, and 120 divided by 15 = 8.