Answer:
Kf = [[Hg(NH₃)₄]²⁺] / [Hg²⁺] [NH₃]⁴
Last step: [Hg(NH₃)₃]²⁺ + NH₃(aq) ⇄ [Hg(NH₃)₄]²⁺(aq)
Explanation:
When the Hg²⁺ ion is in presence of ammonia molecules in an aqueous solution, the tetrahydrated complex is formed, following the equilibriums:
Hg²⁺(aq) + NH₃(aq) ⇄ [Hg(NH₃)]²⁺(aq) K₁
[Hg(NH₃)]²⁺ + NH₃(aq) ⇄ [Hg(NH₃)₂]²⁺(aq) K₂
[Hg(NH₃)₂]²⁺ + NH₃(aq) ⇄ [Hg(NH₃)₃]²⁺(aq) K₃
<em>[Hg(NH₃)₃]²⁺ + NH₃(aq) ⇄ [Hg(NH₃)₄]²⁺(aq) </em> K₄ → Last step.
Global reaction is:
Hg²⁺(aq) + 4 NH₃(aq) ⇄ [Hg(NH₃)₄]²⁺(aq)
And Kf is defined as:
<em>Kf = [[Hg(NH₃)₄]²⁺] / [Hg²⁺] [NH₃]⁴</em>
Answer:
The correct option is B
Explanation:
The number of valence electron(s) increases across the period and thus influences the direction of periodic trend of electronegativity, electron affinity and ionization energy across the period. Thus, making option B the answer.
It should be noted that option A is wrong because elements in the same period generally have the same number of electron shells and thus the distance of this shells from the nucleus remains the same throughout the same period and thus option C is also wrong. Option D is wrong because the periodic trends have to do with chemical reactions which actually involves electrons and not protons.
Answer: Hurricane is not a man-made environmental change.
Explanation:
Changes which take place naturally in the environment without any force or work done by man towards causing that change are called non-man made environmental changes.
For example, hurricane is a natural environment change because a hurricane is formed moist and warm air above water surface of sea, oceans or rivers begin to rise.
This rising air is replaced by the cooler air present in the atmosphere. The continuation of this process leads to the formation large clouds and thunderstorms which occurs in the form of hurricane.
Whereas pollution is caused by vehicles driven by man, from chimneys of factories etc. So, it is a man-made environmental change.
Chemical spill can occur due to mishandling by man in laboratories or chemical labs.
Deforestation also occurs by man as they cut the trees for various needs to theirs.
Thus, we can conclude that hurricane is not a man-made environmental change.
Answer:
according to newtons second law
F=ma
mass of the balloon =0.020 kg
gravity = 9.8m/8^2
force = 0.020 x 9.8
= 1.96 N
x (times) hope it helps
The tool used to measure pressure is a Barometer and is measured in Milibars.