Answer:
Atoms are extremely important structures that make up all of the materials on earth.
Explanation:
Atoms are in our bodies and they bond together to form molecules, which make up matter.
The correct answer is the first option. The piece of evidence would suggest an unknown substance is an ionic compound is that <span>it conducts electricity when dissolved in water.</span><span> A</span><span>n ionic compound dissociates
into ions when in aqueous solution. These ions move freely in the solution and
can allow the flow of electricity into the solution.</span>
The number of protons among the 2 isotopes remain the same, what varies is the number of neutrons between the 2 isotopes. The isotope with the larger mass number possess a greater number of neutrons compared to the other one.
Hello!
An initial pH of 4,0 and an equivalence point at pH=9,1 corresponds to a titration curve for a weak acid to which strong base is added
An example would be the titration of Acetic Acid (CH₃COOH) with Sodium Hydroxide (NaOH)
CH₃COOH + NaOH → CH₃COONa + H₂O
The initial pH will be acid because only the Acetic Acid is present. In the equivalence point, there are no CH₃COOH nor NaOH present, and the only species responsible for pH is CH₃COONa. This is a weak base, as evidenced by the following reaction:
CH₃COO⁻ + H₂O ⇄ CH₃COOH + OH⁻
So, in the equivalence point, the pH will be basic. These observations help us conclude that this titration is of a weak acid with a strong base.
Have a nice day!
