Physical Chemistry & Transition Elements Random Retrieval

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Physical Chemistry & Transition Elements Random Retrieval

This quiz contains all the questions in the Physical Chemistry & Transition Elements section. The website will pick 10 questions at random.

1 / 10

Work out the ratio of the species in the following half-equation.

Br- => Br2 + e-

2 / 10

Using oxidation numbers (states) work out the ratio of the species in the following half-equation.

S2O32- + H2O => SO42- + H+ + e-

3 / 10

Using oxidation numbers (states) work out the ratio of the species in the following half-equation.

H2O => O2 + H+ + e-

4 / 10

Which first-row d-block metal has the main oxidation state +2 and forms colourless compounds?

5 / 10

Which first-row d-block element has the electron configuration

1s22s22p63s23p64s13d5?

6 / 10

Which of these are examples of acid-base reactions according to the Bronsted-Lowry theory.

(i) ZnO(s)+2H3O+(aq)->Zn2+(aq)+3H2O(l)

(ii) H2O(l)+H2O(l)->H3O+ (aq)+ OH-(aq)

(iii) NH3(g)+HBr(g)->NH4Br (s)

(iv) SO2(g)+H2O(l)->H2SO3(aq)

7 / 10

What is the pH of a 0.01 mol dm-3 solution of methanoic acid given that for this acid: Ka = 1.6 x 10-4 mol dm-3 at 298K ?

8 / 10

What is the hydrogen ion concentration in an aqueous solution if the pH = 3.0?

9 / 10

Consider the following equilibrium:

PCl3(g) + Cl2(g) <=> PCl5(g)

6.00 mol of PCl3was mixed with 6.00 mol of Cl2 and the mixture sealed in a vessel and allowed to reach equilibrium. At equilibrium, 2.00 mol of PCl5 was present in the equilibrium mixture.

Calculate the value of the mole fraction of PCl5 present in the mixture under these conditions.

10 / 10

Thiosulfate ions react with acid to produce a precipitate of sulfur. The following volumes of sodium thiosulfate solutions are mixed in separate small flasks with 10 cm3 samples of 2.0 mol dm-3 hydrochloric acid together with enough water to make the total volume 50 cm3.

In which flask does the precipitate of sulfur form fastest?

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