Explanation:
three things that you would notice a chemical reaction is the change of color and change in odor and the change in temperature
1M KCl will require 25 mL to generate 100 mL of 0.25M KCl.
Molarity of a solution is defined as number of moles of solute present in 1000 mL of the solution.
So molarity is inversely proportional to the volume of the solution.
As solution is diluted. Molarity of the solution decreases.
1M of KCl means 1 mole of KCl in 1000 mL of the solution.
1M KCl is four times as concentrated as 0.25M KCl.
Therefore, to make 100 mL of 0.25M will require 
of 1M KCl diluted to 100 mL of distilled water.
Easy alternative: Dilution formula
Where 
are volume and concentration of first solution
and 
are of second solution.
Learn more about dilution formula here,
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The pH scale is a measure of acidity. It ranges from 1 (the most acidic) to 7 (neutral) to 14 (the most basic). It is used to measure solutions for how acidic or basic (a base is the opposite of an acid) they are, and is based on the concentration of H+ or OH- ions. I hope this helps.
Answer:
C. BH_3
Explanation:
The VSEPR is known as the valence shell electron pair repulsion theory. The VSEPR theory determines the total number of electron pairs (TEP) surrounding the central atom of a species. The TEP consists of the bond pairs (BP) and lone pairs (LP). In this model, all the electron pairs (like charges) will orient themselves in such a way as to minimize the electrostatic repulsion between them. These repulsions determine the geometry of the covalent bonds around the central atom.
In the options given, all the molecules have identical geometry except BH_3. This is as a result of the absence of a lone pair on the BH_3 compound.
