<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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The one property that you can always depend on to change vapor pressure is temperature. So as the water's temperature increases so does the vapor pressure. The warmer the water, the higher the vapor pressure.
Blank one: Hot water
Blank Two: Temperature
Mass is the amount of content available in the matter. The mass of the moles of samples given are
2 moles Co = 117.86 g Co
5 moles H2 = 10.10 g H₂
2.1 moles H₂O = 37.84 g H₂O
<h3>What is a mole?</h3>
A mole can be atoms or molecules or ions or any substance.
The mass of one mole of Co is 58.93 g.
Then, 2 moles of Co will be 2 x 58.93 g = 117.86 g Co
The mass of one mole of H₂ is 2.02 g.
Then, 5 moles of H₂ will be 5 x 2.02 g = 10.10 g H₂
The mass of one mole of H₂O is 18.02 g .
Then, 2.1 moles of H₂O will be 2.1 x 18.02 g = 37.84 g H₂O
Thus, the mass of the following samples in grams
2 moles Co = 117.86 g Co
5 moles H₂= 10.10 g H₂
2.1 moles H₂O = 37.84 g H₂O
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Searching for this question, I found the options on the internet.
"1.<span />Two atoms share electrons so they can fill their outer shells<span>2.The constant motion of electrons and the creation of charge imbalances bonds two molecules together3.A hydrogen atom with a slight positive charge is attracted to a negative charge of another molecule or atom4.One atom loses one or more electrons and the other atom gains one or more electrons"
The correct answer would be number 1. A covalent bond is achieved when two atoms share electrons from their outer shell so that they have a full outer shell leading to the electronic configuration balance they need.</span>
Pretty sure it would be formula
