Answer:
nstead of using two dots to indicate the two electrons that comprise the covalent bond, a line is substituted for the two dots that represent the two electrons. Below is shown the Lewis structure for water. Two hydrogens (H) are separately covalently bonded to the central oxygen (O) atom.
Explanation:
of heat must be added up to the second reservoir to make both reservoirs have the same increase in entropy.
Entropy is the measure of systems thermal energy per unit temperature.
Mathematically,
Entropy = 
ΔS = 
For reservoir first ,
Q (heat) = 400 J
Temperature = 
° C = ° + 273 K
= 243K
Therefore ,
ΔS = 
J/K
For second reservoir,
Q = ?
Temperature = 0° C + 273°
= 273 K
ΔS = 
According to question, Entropy of both the systems are same
Therefore,
= J/K
Q = 
J
Q = 449.38 J
To know more about Entropy,
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Answer:
If the pKa of the acid is low (negative), then the acid is strong.
Explanation:
Ka, <em>the acid ionization constant, </em>measures the strength of an acid in a solution. Stronger acids have higher Ka values.
We defined: pKa = -log[Ka]
This function is a decreasing function, meaning that pKa will be getting smaller and smaller, while increasing Ka (high values of Ka will have negative pKa values). Therefore, stronger acids (high values of Ka), will have low (negative) pKa values.
Answer:
It's true :) Hope that helps
