Answer:
Attraction
(e-) ---> <--- (H+)
Repulsion:
<---(e-) (e-)-->
Neutral:
(e-) (Helium)
Explanation:
Accordingly to coulomb's law:
In the attraction, the hydrogen without an electron has a positive charge and needs to be fulfilled with a negative charge found in an eletron.
In the repulsion, both electrons has the same charge and repulse each other.
In the neutral case, the Helium is highly stable therefore the electron is not attracted.
pH. 10 because it is strong base
Answer:
1 mole of Sn is required to react with 40 gram of HF
Explanation:
It is given that molar mass of HF is 20.01 g/mol
Mass of HF is 40 gram
So number of of HF is
Number of moles
When reaction between HF and Sn takes place
From the reaction it is clear that 1 mole Sn require 2 moles HF
Therefore 2 moles of HF require 1 mole Sn
Answer:
(C) It is favorable and is driven by ΔH° only.
Explanation:
Let's consider the following balanced equation.
2 Na₂O₂ + S + 2 H₂O → 4 NaOH + SO₂
To determine whether it will be favorable or not at 298 K, we need to calculate the standard Gibbs free energy (ΔG°).
- If ΔG° < 0, the reaction will be favorable.
- If ΔG° > 0, the reaction will be unfavorable.
We can calculate ΔG° using the following expression.
ΔG° = ΔH° - T.ΔS°
As we can see from the expression above, the favorability will be driven if ΔH° < 0 and if ΔS° < 0. Since ΔH° = -610 kJ/mol and ΔS° = -73 J/K.mol, the favorability will be driven by ΔH°. Now, let's calculate the overall favorability.
ΔG° = ΔH° - T.ΔS°
ΔG° = -610 kJ/mol - 298 K.(-0.073 kJ/K.mol) = -588 kJ/mol
The reaction is favorable and is driven by ΔH° only.
Answer:
If it is raining and your on wet land
The thunderstorm lightning is generated by the collision of the charged clouds in the earth's atmosphere. It has a tendency to flow to the earth because it acts as a reservoir for the electrical charges.
In the following condition a person is prone to be struck by lightning:
When a person is standing below tall buildings having no provision of dissipating the electrical lightening because it provides a low resistance path for the flow of charge to the earth.
When a person is standing below a tall tree it also provides low resistance and high conductivity path for the charges to flow to the reservoir earth.