Answer :
The number of bonding pairs of electrons around the hydrogen atom = 2
The number of lone pairs of electrons around the hydrogen atom = 0
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.
In the Lewis-dot structure the valance electrons are shown by 'dot'.
The given molecule is, 
As we know that carbon has '4' valence electrons, hydrogen has '1' valence electrons and nitrogen has '5' valence electrons.
Therefore, the total number of valence electrons in = 1 + 4 + 5 = 10
According to Lewis-dot structure we conclude that, there are 8 number of bonding electrons and 2 number of non-bonding electrons.
The number of bonding pairs of electrons around the hydrogen atom = 2
The number of lone pairs of electrons around the hydrogen atom = 0
Answer:
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Explanation:
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The electron configuration that belongs to the atom with the lowest first ionization energy is francium.
<h3>What is ionization energy? </h3>
Ionization energy is defined as the minimum amount of energy required to remove the most loosely electron present in outermost shell.
<h3>Ionization energy across period</h3>
Ionization energy increase as we move from left to right in the period. This can be explained as when we move from left to right along period new electron is added to the same shell which increase the nuclear charge. Hence results int he decrease in size. Due to this decrease in size more energy is required to remove electron from outermost shell.
<h3>Ionization energy along group</h3>
Ionization energy decrease as we move from top to bottom along group. This can be explained as we move from top to bottom new electron is added to new shell. Due to addition of new shell the size of atom increases which results in the decrease in the nuclear charge. Due to this less amount of energy is needed to remove an electron.
Thus, we concluded that the electron configuration that belongs to the atom with the lowest first ionization energy is francium.
learn more about ionization energy:
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Answer:
The best definition is: "Buffer capacity is the amount of acid or base that can be added to a buffer without destroying its effectiveness"
Explanation:
A buffer is a solution that is somewhat resist to pH changes by reacting with acids and bases that may be added into the solution. It's capacity is the amounto of acid or base that can be added into solution without much change in pH.
So the best definition is: "Buffer capacity is the amount of acid or base that can be added to a buffer without destroying its effectiveness"
Answer:
Molality = 1.46 molal
The freezing point of the solution = -2.72 °C
Explanation:
Step 1: Data given
The freezing point of water H2O is 0.00°C at 1 atmosphere
urea = nonelectrolyte = van't Hoff factor = 1
Mass urea = 13.40 grams
Molar mass urea = 60.1 g/mol
Mass of water = 153.2 grams
Molar mass H2O = 18.02 g/mol
Kf = 1.86 °C/m
Step 2: Calculate moles urea
Moles urea = mass urea /molar mass urea
Moles urea = 13.40 grams / 60.1 g/mol
Moles urea = 0.223 moles
Step 3: Calculate the molality
Molality = moles urea / mass water
Molality = 0.223 moles / 0.1532 kg
Molality = 1.46 molal
Step 4: Calculate the freezing point of the solution
ΔT = i * Kf * m
ΔT = 1* 1.86 °C/m * 1.46 m
ΔT = 2.72 °C
The freezing point = -2.72 °C
