Answer:
Acid-base indicators are chemicals used to determine whether an aqueous solution is acidic, neutral, or alkaline. Because acidity and alkalinity relate to pH, they may also be known as pH indicators. Examples of acid-base indicators include litmus paper, phenolphthalein, and red cabbage juice.
Explanation:
The goal of an element is to obtain a noble gas configuration (obtaining a full valence shell). Therefore, certain elements will either gain or lose electrons in order to obtain this full valence shell. In the case of sodium chloride, it is easy for sodium (having one valence electron) to give up its one electron. Chlorine (having seven valence electrons) wants sodium’s electron because it completes its outer shell and chlorine obtains this noble gas configuration. Ionic bonds always involve a transfer of electrons.
<span>Barium lies in the second group of the periodic table. Elements in this group have two valence shell electrons. These elements have a tendency to produce cations since it is easier to lose the two electrons than to gain six. Now, out of the options, chlorine forms an anion. It is an element from group 7, meaning it exhibits a valency of -1. Therefore, in order to bond with Barium, two Chlorine atoms will be needed. <u>The second option is correct.</u></span>
Endocytosis where the substance will be surrounded by a cell membrane and then broken down for food or just discarded as waste.
