question10

The diagram below shows two small identical spheres, P and Q, on insulated stands. The charge on sphere P is -3 × 10-6 C and the charge on sphere Q is unknown. 10.1 Calculate the number of electrons in excess on sphere P. (3) The two spheres are brought into contact and are then returned … Read more

The balanced chemical equation for the EXTRACTION of gold from its ore is as follows: 10.1 State ONE disadvantage of using cyanide (CN– ) in the extraction of gold. (1) 10.2 Will the final solution of the extraction process be ACIDIC or BASIC (ALKALINE)? Give a reason for the answer. (2) 10.3 Determine the oxidation … Read more

Three resistors, of resistances 3 Ω, 4 Ω and 6 Ω, and a bulb are connected in a circuit,   as shown below. Initially all the switches, S1, S2 and S3, are open. The internal resistance of the battery and the resistance of the connecting wires may be ignored. 10.1 State Ohm’s law in words. (2) … Read more

In the flow diagram below, I and II represent industrial processes used in the fertiliser industry. P and Q are chemical reactions that take place to produce ammonium sulphate and fertiliser Y respectively. 10.1 Write down the name of the industrial process: 10.1.1 I (1) 10.1.2 II (1) 10.2 Write down the NAME or FORMULA … Read more

QUESTION 10 (Start on a new page.) The flow diagram below shows the processes involved in the industrial preparation ofan ammonium fertiliser. 10.1 Write down the NAME or FORMULA of: 10.1.1 Gas X (1) 10.1.2 Gas Y (1) 10.1.3 Acid Q (1) 10.2 Write down the: 10.2.1 TYPE of chemical reaction that converts compound P … Read more

During an experiment, light of different frequencies is radiated onto a silver cathode of  a photocell and the corresponding maximum speed of the ejected photoelectrons are measured. A graph of the energy of the incident photons versus the square of the maximum speed of the ejected photoelectrons is shown below. 10.1 Define the term photoelectric … Read more

An experiment is conducted to investigate the relationship between the frequency oflight incident on a metal and the maximum kinetic energy of the emitted electrons fromthe surface of the metal. This experiment is conducted for three different metals. The graph below represents the results obtained. 10.1 Name the phenomenon on which this experiment is based. … Read more

10.1 The flow diagram below shows how fertiliser B is produced in industry. Write down the: 10.1.1 NAME of S (1) 10.1.2 NAME of T (1) 10.1.3 NAME or FORMULA of the catalyst used in process 1 (1) 10.1.4 NAME or FORMULA of compound A (1) 10.1.5 NAME of process 2 (1) 10.1.6 Balanced equation … Read more