Answer:
Ka for the monoprotic acid is 4.65 ×10⁻⁴ M.
Explanation:
Chemical reaction: HA(aq) ⇄ A⁻(aq) + H⁺(aq).
c(monoprotic acid) = 0.0110 M.
pH = 2.69
[A⁻] = [H⁺] = 10∧(-2.69).
[A⁻] = [H⁺] = 0.00204 M; equilibrium concentration.
[HA] = 0.0110 M - 0.00263 M.
[HA] = 0.00837 M.
Ka = [A⁻]·[H⁺] / [HA].
Ka = (0.00204 M)² / 0.00837 M.
Ka = 0.000465 M
= 4.65 ×10⁻⁴ M.
<span>Endothermic Reaction. This reaction or process absorbs energy from its surroundings, mostly, but will not always be, in form of heat. A reaction that requires the input of energy that breaks a bond will always be endothermic. Best examples of endothermic reaction are: 1) melting cubes; 2) evaporating of liquid; 3) melting solid salts, etc.</span>
Planets outside solar system are referred to as exoplanets. some scientists have put forward suggestions that there could be living organisms residing in some of the exoplanets. scientists have suggested that some exoplanets are found within the habitable distance from the star they revolve around. at this distance temperature can allow existence of liquid water. Where there is water automatically there is life. so astronomers may infer that life exist in exoplanets by determining whether they are with habitable distance from their star.
Answer: An example is NaCl which exist as a ionic compound which has an ionic bond
Explanation: First of all , ionic bonds is the bond formed when a metal and a non metal reacts together.
in sodium chloride it contain sodium and chlorine IONS which are charged particles. the charged particles which are the ions are held together with these force of attraction hence creating such ionic bonds between them
so Na ions and the Cl ions are held together by their ions
Na± and the Cl±
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They're only found in the nucleus and play an important role in keeping the atom stable because they carry a negative charge to counteract the proton's positive charge.