The melting points and boiling points of four substances (A, B, C and D) are shown inthe table below. 3.1 Define the term melting point. (2) 3.2 Explain the difference in melting points of HF and HCâ„“ by referring to theTYPE of intermolecular forces. (4) 3.3 Which ONE of the substances (A, B, C or … Read more
2.1 Ammonia NH3(g) and hypochlorous acid HOCâ„“(â„“) are both examples ofcovalent compounds. 2.1.1 Define the term bonding pair. (2) 2.1.2 Draw Lewis structures for the following molecules: (a) NH3 (2)(b) HOCâ„“ (2) 2.1.3 Write down the: (a) Number of bonding pairs in NH3 (1)(b) Number of lone pairs on the oxygen atom in HOCâ„“ (1)(c) … Read more
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 numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 E. Each question has only ONE correct answer. 1.1 The number of valence electrons in a silicon atom is … A … Read more
DATA FOR PHYSICAL SCIENCES GRADE 11PAPER 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 11VRAESTEL 1 (FISIKA)
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
A coil with 200 windings and a surface area of 2,8 × 10-3 m is rotated at constant speed in a constant magnetic field of 2,5 T. An emf of 3,5 V is induced in the coil. 9.1 Consider the following statement: The magnitude of the induced emf across the ends of a conductor is … Read more
Two small identical metal spheres on insulated stands carry charges of +4,2 × 10-9 C and -6,8 × 10-9 C respectively. They are placed at a distance of 0,3 m apart. 8.1 State Coulomb’s law in words. (2) 8.2 Calculate the magnitude of the electrostatic force that the one charge exerts on the other. (3) … Read more
An experiment is set up to determine the relationship between the DEGREE OF DIFFRACTION and WAVELENGTH of light. Blue light is passed through a single slit and the pattern formed is observed. The experiment is now repeated with green light and then with red light. The distance between the light source and the slit remains … Read more