Zadanie 1c
Explain why a solution of methanoic acid has a higher pH than hydrobromic acid of the same concentration.
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Explain why a solution of methanoic acid has a higher pH than hydrobromic acid of the same concentration.
A pH probe can be used to distinguish between the two acids. Identify another simple instrumental method that could be used in a school laboratory to tell them apart.
Outline how the method identified in part 1d distinguishes between the two acids.
Outline why the first ionization energies of all the elements in the table are positive, whereas the first electron affinities of most of them are negative.
The first electron affinity of magnesium is positive. Sketch the 3s and 3p orbital filling diagram of the species formed when one electron is added to a gaseous magnesium atom.
Suggest one reason why the first electron affinity of magnesium is positive.
Suggest reasons why argon has the largest first ionization energy and the largest positive first electron affinity of the elements in period 3. Largest first ionization energy: Largest positive first electron affinity:
Suggest whether the first electron affinity of xenon is greater or smaller than that of argon, and give one reason for your answer.
Lead(II) bromide is electrolysed in the molten state at 400 °C. Lead melts at 327 °C and lead(II) bromide melts at 371 °C; bromine boils at 59 °C. Which is the correct equation for the overall reaction? A. PbBr2(l) → Pb(l) + Br2(g) B.…
Determine the empirical formula of X.