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devozeeba The vapour pressure versus temperature graph below was obtained for four straight chain (unbranched) alkanes (P, Q, R and S).FROM P TO S, EACH COMPOUND DIFFERS FROM THE PREVIOUS COMPOUND BY A –CH2 GROUP.The vapour pressures are measured in mmHg. Atmospheric pressure is 760 mmHg. 3.1 Give a reason why alkanes are said to be … Read more
2.1 Study the structural formula below. For this compound, write down the:2.1.1 Homologous series to which it belongs (1)2.1.2 IUPAC name (2)2.1.3 IUPAC name of the organic acid used in its preparation (1)2.1.4 STRUCTURAL FORMULA of its straight chain (unbranched) functional isomer (2) 2.2 Write down the structural formula of 4-methylpentan-2-one. (3) 2.3 Consider the … Read more
MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question number (1.1–1.10) in the ANSWER BOOK, for example 1.11 D. 1.1 The acceleration due to gravity on Earth is greater than that on the moon.Which ONE of the following … Read more
1.1 The IUPAC name of an organic compound with molecular formula C7H14O2:A HeptanalB Heptan-1-olC Heptan-2-olD Heptanoic acid (2) 1.2 Which ONE of the following structures is the functional group of aldehydes? 1.3 Which ONE of the following equations represents a cracking process? 1.4 The potential energy diagram for a chemical reaction is shown below. I: … Read more
DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 1 (FISIKA) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES TABLE 2: FORMULAE/TABEL 2: FORMULES MOTION/BEWEGING FORCE/KRAG WORK, ENERGY AND POWER/ARBEID, ENERGIE EN DRYWING WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG ELECTROSTATICS/ELEKTROSTATIKA ELECTRIC CIRCUITS/ELEKTRIESE STROOMBANE ALTERNATING CURRENT/WISSELSTROOM QUESTION 11.2 Hand … Read more
In an experiment to demonstrate the photoelectric effect, light of different wavelengths was shone onto a metal surface of a photoelectric cell. The maximum kinetic energy of the emitted electrons was determined for the various wavelengths and recorded in the table below. 11.1 What is meant by the term photoelectric effect? (2) 11.2 Draw a … Read more
10.1 A teacher demonstrates how current can be obtained using a bar magnet, a coil and a galvanometer. The teacher moves the bar magnet up and down, as shown by the arrow in the diagram below. 10.1.1 Briefly describe how the magnet must be moved in order to obtain a LARGE deflection on the galvanometer. … Read more