Zadanie 1b
Outline one chemical test, other than the use of an indicator, that can distinguish between the two acids, and state the expected result.
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Outline one chemical test, other than the use of an indicator, that can distinguish between the two acids, and state the expected result.
A neutralization curve for a weak acid, HA, titrated with a strong base is shown. (i) Estimate the pKa of HA. (ii) Explain, using an equation, why the pH changes very little when small volumes of strong base are added to the weak acid in the buffer…
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.
Explain the decrease in first ionization energy from magnesium to aluminium.
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.
What is the mass of one molecule of white phosphorus, P4? Use NA = 6.02 × 1023 mol−1. A. 5.1 × 10−23 g B. 2.1 × 10−22 g C. 4.9 × 1021 g D. 7.5 × 1025 g
An unknown organic compound, X, contains only carbon, hydrogen and oxygen. Elemental analysis shows that it contains 54.5 % carbon and 36.3 % oxygen by mass. (i) Determine the empirical formula of X. The mass spectrum of X is shown. (ii) Identify the species…