QUESTION 6 (Start on a new page.) 6.1 The first step in the extraction of zinc from zinc sulphide (ZnS) is thecombustion of ZnS in oxygen. The balanced equation for the reaction is: 6.1.1 Is the reaction above EXOTHERMIC or ENDOTHERMIC? Give a reason for the answer. (2) Oxygen gas consists of oxygen molecules. 6.1.2 … Read more
QUESTION 5 (Start on a new page.) Consider the compound Aℓ2 (SO4)3 . 5.1 Write down the NAME of the compound above. (1) 5.2 Define the term molar mass. (2) 5.3 Calculate the following for Aℓ2 (SO4 )3 : 5.3.1 Its molar mass (2) 5.3.2 Its percentage composition (3) 5.3.3 The number of moles present … Read more
QUESTION 4 (Start on a new page.) A section of the periodic table is shown below. Imaginary symbols are used torepresent some of the elements. 4.1 Write down the IMAGINARY SYMBOL, as shown above, of the element that: 4.1.1 Is a halogen (1) 4.1.2 Will form a cation with a charge of +2 (1) 4.1.3 … Read more
QUESTION 3 (Start on a new page.) 3.1 The three isotopes of magnesium are Mg-24, Mg-25 and Mg-26. The percentage abundance of the three isotopes is 80%, 10% and 10% respectively. 3.1.1 Define the term isotope. (2) 3.1.2 Calculate the relative atomic mass of magnesium. (4) 3.1.3 The number of protons and electrons, the mass … Read more
Most elements found on Earth are metals. All metals have a metallic structure. 2.1 For a metallic structure, write down the: 2.1.1 Type of particles present (2)2.1.2 Type of chemical bond formed between particles (1) 2.2 In which region on the periodic table are metals found? Choose from LEFT or RIGHT. (1) 2.3 Write down … Read more
QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Choosethe answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) inthe ANSWER BOOK, e.g. 1.11 E. Each question has only ONE correct answer. 1.1 Nitrogen gas is an example of a/an … A element. … Read more
In the circuit diagram below, the resistance of the battery, ammeter and connecting wires are negligible. 11.1 Explain the meaning of the following: A current of 5 A (2) 11.2 Calculate the effective resistance of the parallel resistors. (3) 11.3 Which one of the voltmeters, V1 or V2, will show a reading if the switch … Read more
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
A compass is used to determine the poles of a magnet. The compass is placed in different positions around the magnet, as shown below. The dark arrow indicates the north pole of the compass. 9.1 Explain the term ferromagnetic materials. (2) 9.2 Is X a NORTH pole or a SOUTH pole? (1) 9.3 At which … Read more
The frequency and corresponding energy of electromagnetic waves are given in the table below. 8.1 Describe how an electromagnetic wave propagates. (2) 8.2 What is the relationship between frequency and energy of an electromagnetic wave, as shown in the table above? (2) 8.3 Calculate the: 8.3.1 Frequency of wave E (3) 8.3.2 Wavelength of wave … Read more