NATIONAL SENIOR CERTIFICATENASIONALE SENIOR SERTIFIKAATDATA FOR PHYSICAL SCIENCES GRADE 11PAPER 2 (CHEMISTRY)GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 11VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES TABLE 2: FORMULAE/TABEL 2: FORMULES TABLE 3: THE PERIODIC TABLE OF ELEMENTS/TABEL 3: DIE PERIODIEKE TABEL VAN ELEMENTE
10.1 The mining industry contributes towards the South African economy. Gold is one of the minerals that is being mined in South Africa. 10.1.1 Write down the name of the location of the major mining activity in South Africa. (1) The following chemical reaction occurs during the final steps in the recovery process of gold. … Read more
9.1 Consider the redox reaction given below. 9.1.1 Define oxidation reaction in terms of electron transfer. (2) Write down the: 9.1.2 Formula of the reducing agent. (2) 9.1.3 Reduction half reaction (2) 9.2 Consider the redox reaction below: 9.2.1 Determine the oxidation number of nitrogen (N) in . (2) 9.2.2 Balance the above chemical equation … Read more
8.1 Consider the chemical reaction below: 8.1.1 Define a base according to a Lowry-Bronsted theory. (2) 8.1.2 Write down ONE conjugate acid-base pair in the equation. (1) 8.1.3 Is the reaction mixture ACIDIC or ALKALINE at the completion of the reaction? Give a reason for your answer. (2) 8.1.4 Write down the formula of a … Read more
The fertiliser ammonium sulphate ((NH4)2SO4) is produced from the reaction ofsulphuric acid (H2SO4) and ammonia (NH3) according to the balanced equation: 2 kg of sulphuric acid and 58,82 moles of ammonia are available to produce thefertiliser. 7.1 Define the term limiting reagent. (2) 7.2 Calculate the maximum mass of ammonium sulphate that can be produced … Read more
6.1 Methyl propanoate is an organic compound with the following percentagecomposition: 54,55% C ; 9,09% H ; 36,36% O The molar mass of the compound is 88 gāmol-1. 6.1.1 Define the term empirical formula. (2) 6.1.2 Determine, by calculation, the empirical formula. (6) 6.1.3 Determine the molecular formula. (2) 6.2 Learners prepare a solution of … Read more
Learners study ENDOTHERMIC and EXOTHERMIC reactions by conducting experiments I and II in which the reactions shown in the table below take place. The learners measured the initial and final temperatures of the reaction mixtures.They also obtained activation energies for the reactions from a data table. The learners represented their findings in a table as … Read more
Grade 11 learners want to verify the relationship between temperature and volume of a gas. They used the following experimental set-up. 4.1 Write down the name of the gas law that is investigated. (1) 4.2 For this investigation write down the: 4.2.1 Investigative question (2) 4.2.2 Controlled variable (1) 4.3 Write down the name of … Read more
3.1 The boiling points in the table below were obtained during an investigation carried out to compare the boiling points of group 7 hydrides. The hydrides, HCā and HBr, are labelled in the table as compounds A and B respectively. 3.1.1 Define the term boiling point. (2) 3.1.2 In what phase are compounds (A and … Read more
Consider the following chemical equations: 2.1 Define the term covalent bond. (2) 2.2 Write down the Lewis structure for the CH4 molecule. (2) 2.3 Consider the bonds C ā H and O ā H Which bond ā¦ 2.3.1 has a longer bond length? Give a reason for your answer. 2.3.2 is stronger? (1) 2.4 How … Read more