Question 1 Report
(a)The table below gives the volume/pressure data for a particular sample of a gas-at a given temperature.
| Volumedm\(^3\) (V) |
4.00 | 2.00 | 1.00 |
| Pressure/atm (P) |
1.00 | 2.00 | 4.00 |
(i) Deduce a mathematical relationship between volume (V) and pressure (P).
(ii) Name law that can be deduced from the data.
(iii) Calculate the pressure of the gas when the volume is 3.20 dm\(^3\)
(b)(i) What is the role of a salt bridge in an electrochemical cell?
(ii) What type of ions must flow into the cathode? Give a reason for your answer.
(iii)A standard galvanic cell constructed with Ag\(^+_{(aq)}\) Ag\(_{(s)}\) and Zn\(^{2+}_{(aq)}\) couple is discharged until 3.3 g of Ag forms.
I. Write the overall cell reaction and standard cell potential?
II. How many moles of electrons flowed through the circuit during the discharge?
III. How many coulombs of charges flowed through the circuit?
Ag\(^+_{(aq)}\) + e\(^-\) \(\rightleftharpoons\) Ag\(_{(s)}\); E° = + 0.80V
Zn\(^{2+}_{(aq)}\) + 2\(^-\) \(\rightleftharpoons\) Zn\(_{(s)}\), E° = – 0.76 V [Ag = 108]
(c)(i) Define each of the following terms: I. Activation energy; II. Exothermic reaction.
(ii) Give one example of an endothermic process.
(iii) What is the significance of activated complex in a chemical reaction?