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CHEM1011-CHEM1031-CHEM1051-Chemistry 1A (T1 2025)
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Consider the following statements:
| (i) | A reduction half equation contains at least one species that is being reduced and at least one electron on the left hand side of the reaction arrow. |
| (ii) | A redox reaction in an electrochemical cell involves electron transfer between two species where electrons travel between two electrodes via an external electrical circuit. |
| (iii) | A redox reaction where all species are in direct contact with one another does not involve electron transfer. |
The reaction below is exothermic:
2SO2 (g) + O2 (g) ⇌ 2SO3 (g)Le Châtelier's Principle predicts that ________ will result in an increase in the number of moles of SO3 (g) in the reaction container.
Consider the reaction below, for which K = 7.26 × 10–2 at 450.0 °C.
2Cl2 (g) + 2H2O (g) ⇌ 4HCl (g) + O2 (g)What is the value of K at this temperature for the following reaction? Cl2 (g) + H2O (g) ⇌ 2HCl (g) + ½O2 (g)
Consider the following equilibrium reaction:
H2CO3 (aq) ⇌ H+ (aq) + HCO3– (aq); K = 5.0 x 10–7
If the initial concentrations of the species are:
[H2CO3] = 0.12 M; [H+] = 5.00 x 10–5 M; [HCO3–] = 4.00 x 10–3 M
Which one of the statements below describes the relationship between Q and K and then the correct direction of chemical change?
A galvanic cell was constructed where one electrode was a Cu2+(aq)|Cu(s) electrode and the other was an M2+(aq)|M(s) electrode. The potential difference between the two electrodes was measured to be 1.03 V with the M2+(aq)|M(s) electrode being the more positive electrode. What is the potential of the M2+(aq)|M(s) electrode with respect to the standard hydrogen electrode?
Data: E°(Cu2+(aq)|Cu(s)) = +0.34 V
Which of these cell diagrams correctly represents a cell in which this reaction is happening?
Mg(s) + Cu2+(aq) → Mg2+(aq) + Cu(s)
A galvanic cell constructed using an X+|X electrode connected to a standard copper half–cell (as used in this experiment) was found to have a cell potential of 0.45 V with the X+|X electrode being positive with respect to the copper electrode. Where on the number line below would you place the X+|X electrode?
A galvanic cell was constructed where one electrode was a Cu2+(aq)|Cu(s) electrode and the other was an M2+(aq)|M(s) electrode. The potential difference between the two electrodes was measured to be 0.27 V with the copper electrode being the more positive electrode. What is the potential of the M2+(aq)|M(s) electrode with respect to the standard hydrogen electrode?
Data: E°(Cu2+(aq)|Cu(s)) = +0.34 V
Consider an iron nail with silver wrapped onto it, immersed in an agar gel containing phenolphthalein and potassium ferricyanide. After a few minutes a pink colour appeared in the gel around the silver metal and a blue colour was observed in the gel near the tip and head of the iron nail. What is the most accurate interpretation of these observations?
A galvanic cell constructed using an X+|X electrode connected to a standard copper half–cell (as used in this experiment) was found to have a cell potential of 0.45 V with the X+|X electrode being negative with respect to the copper electrode. Where on the number line below would you place the X+|X electrode?