question8

8.1 Corrosion is a redox reaction that takes place in the presence of oxygen and water. Rusting is the corrosion of iron leading to the formation of iron(III) ions. 8.1.1 Define oxidation in terms of electron transfer. (2) A cleaned copper rod and a cleaned iron nail are placed in a beaker containing water at … Read more

The battery in the circuit diagram below has an emf of 12 V and an internal resistanceof 0,5 Ω. Resistor R has an unknown resistance. 8.1 What is the meaning of the following statement?The emf of the battery is 12 V. (2) The reading on the ammeter is 2 A when switch S is OPEN. … Read more

QUESTION 8 (Start on a new page.) A standard electrochemical cell is set up using two standard half-cells, as shown in thediagram below. 8.1 State the energy conversion that takes place in this cell. (1) 8.2 What is the function of component Q? (1) X is a metal. A voltmeter connected across the cell initially … Read more

In the circuit diagram below, resistor R,with a resistance of 5,6 Ω, is connected,   together with a switch, an ammeter and a high-resistance voltmeter, to a battery with an unknown internal resistance, r. The resistance of the connecting wires and the ammeter may be ignored. The graph below shows the potential difference across the terminals … Read more

A battery with an internal resistance of 0,5 Ω and an unknown emf (ε) is connected tothree resistors, a high resistance voltmeter and an ammeter of negligible resistance, asshown in the circuit diagram below. 8.1 Define the term emf of a battery. (2) The reading on the voltmeter DECREASES by 1,5 V when switch S … Read more

The electrochemical cell illustrated below is set up under standard conditions 8.1 Component X completes the circuit in the cell. State ONE other function of component X. (1) 8.2 Define the term anode. (2) 8.3 Identify the anode in the cell above. (1) 8.4 Write down the: 8.4.1 Reduction half-reaction that takes place in this … Read more