<h3>Why is Hydroxide added ?</h3>
In the polymerization reaction, the lone pair electrons on the NH₂ groups of hexanediamine attack the C=O groups of the dicarboxylic acid in a nucleophilic substitution reaction as shown in the image.
Hydroxide is added to remove any H⁺ ions present and keep the hexanediamine in the deprotonated form, so that the NH₂ lone pair electrons are available for reaction.
<h3 /><h3>What if you don't add it ?</h3>
If hydroxide is not added, the NH₂ groups will get protonated by H⁺ ions present to give NH₃⁺ groups, which cannot react.
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Answer:
6.69 moles
Explanation:
Data obtained from the question include:
Volume = 2230mL
Molarity of NaOH = 3 M
First, we'll convert 2230mL to L. This is illustrated below:
1000mL = 1L
2230mL = 2230/1000 = 2.23L
Now, we can obtain the number of mole of NaOH in the solution as follow:
Molarity = mole /Volume
Mole = Molarity x Volume
Mole of NaOH = 3 x 2.23
Mole of NaOH = 6.69 moles
Therefore, the total number of mole of the solute (NaOH) in the solution is 6.69 moles
Solution: We are taking second element from the 4th period.
Element's name is Calcium.
It's symbol is Ca.
It is a metal because it looses its valence electron to form positive ions.
Calcium element lies in the second group of 4th period. The elements belonging to the second group are known as alkaline earth metals.
Atomic Number of Calcium = 20
Atomic number = Number of protons = Number of electrons
therefore,
Number of electrons and protons = 20
Atomic Mass of Calcium = 40
Atomic Mass = Number of neutrons + Number of proton
bu substituting the values of atomic mass and number of prtons, neutrons can be calculated
Number of neutrons = 20.
The first is Design Process, the second is To see if the design solves the problem
Answer:
90 m
Explanation:
60 m plus 30 m=90 m simple math