Which is the correct Lewis dot structure of NH2-?
2 answers:
Answer: The correct answer is Option D.
Explanation:
Lewis dot structures are the structures which represent the valance electrons of an element forming a compound. The electrons are represented as the dots.
In a compound, the bonded electrons are represented as a bond and lone pair of electrons are represented as dots.
In compound,
Electronic configuration of Nitrogen:
Valence electrons in nitrogen = 5
Electronic configuration of hydrogen:
Valence electrons in hydrogen = 1
In the given compound, bond pairs are 2 which means number of electrons bonded are 4.
Unbonded electrons left on nitrogen will be 3 and this compound has an extra electron because of the negative charge present on the compound. Hence, total unbonded electrons present on this compound will be 4.
Therefore, the lewis dot structure will be Option D.
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Answer:
1) The order of the reaction is of FIRST ORDER
2) Rate constant k = 5.667 × 10 ⁻⁴
Explanation:
From the given information:
The composition of a liquid-phase reaction 2A - B was monitored spectrophotometrically.
liquid-phase reaction 2A - B signifies that the reaction is of FIRST ORDER where the rate of this reaction is directly proportional to the concentration of A.
The following data was obtained:
t/min 0 10 20 30 40 ∞
conc B/(mol/L) 0 0.089 0.153 0.200 0.230 0.312
For a first order reaction:
where :
K = proportionality constant or the rate constant for the specific reaction rate
t = time of reaction
= initial concentration at time t
= final concentration at time t
= concentration at time t
To start with the value of t when t = 10 mins
When t = 20
When t = 30
When t = 40
We can see that at the different time rates, the rate constant of all have similar constant values
As such :
Rate constant k = 0.034 min⁻¹
Converting it to seconds ; we have :
60 seconds = 1 min
∴
0.034 min⁻¹ =(0.034/60) seconds
= 5.667 × 10 ⁻⁴ seconds
Rate constant k = 5.667 × 10 ⁻⁴