Natural Sciences Grade 9 June Common 2010 Memo

Province of the EASTERN CAPE EDUCATION SENIOR PHASE GRADE 9 JUNE 2010 NATURAL SCIENCES MARKING GUIDELINE MARKS: 100 TIME: 2 hours This memorandum consists of 4 pages.

2 NATURAL SCIENCES (JUNE 2010) QUESTION 1 1.1 C 1.2 D 1.3 D 1.4 C 1.5 D 1.6 A 1.7 A 1.8 A 1.9 C 1.10 D (10 x 2) [20] QUESTION 2 2.1 C 2.2 H 2.3 K 2.4 A 2.5 D 2.6 F 2.7 I 2.8 N 2.9 M 2.10 J (10 x 1) [10] QUESTION 3 3.1 Equation 1 (1) 3.2 from the sun (1) 3.3 carbon dioxide, water, carbohydrate (any two) (2) 3.4 1. During the day plants use daylight to photosynthesise and thus use carbon dioxide and release oxygen. Plants also respire which uses oxygen and releases carbon dioxide. 2. During the night as there is no light; plants do not photosynthesise or the process is very slow and only use very little carbon dioxide, use oxygen for respiration, thus releasing more carbon dioxide and using up oxygen. People also respire and thus need oxygen too. The plants thus compete with us for the oxygen in the bedroom at night/more carbon dioxide is produced. (2 x 1) (2) [6]

(JUNE 2010) NATURAL SCIENCES 3 QUESTION 4 4.1 a) 10 nm – 200 nm (1) b) 5 µm to less than 1 µm (1) 4.2 BACTERIA VIRUSES 1. Unicellular 1. not a true cell. 2. can be useful 2. only harmful. (4) 4.3 –when the body is weak disease causing organisms attack the body easily/get an opportunity to attack the body, so the person gets diseases like cold, influenza, polio, chicken pox, blisters, Aids etc (2) 4.4 –tuberculosis, diphtheria, gastric fever (3 x 1) (3) 4.5 (a) Acquired immune-deficiency syndrome (b) Extensive Drug Resistant Tuberculosis (c) Multi drug Resistant Tuberculosis (3 x 1) (3) [14] QUESTION 5 5.1 RT = R1 + R2 RT = 36 Ώ + 24 Ώ RT = 60 Ώ (3) 5.2 I= V/R = 60 V / 60 Ώ =1A (3) 5.3 V=IR =1 A x 36 Ώ =36 V (3) 5.4 The more resistors connected in parallel, the smaller the total resistance and the stronger the current. (2) [11] QUESTION 6 6.1 (a) metals (b) non-metals (2) 6.2 mercury and bromine (2) 6.3 Hydrogen, argon, fluorine, krypton (4) 6.4 Noble gases/inert gases (1) 6.5 Helium (1)

4 NATURAL SCIENCES (JUNE 2010) 6.6 (a) Helium (b) Sodium Chloride (c) Copper Sulphate (d) Lead (4 x 1) (4) 6.7 (a) CaCO3 – Calcium carbonate (b) Na2SO4 – Sodium sulphate (c) NH4Cl – Ammonium chloride (3) [17] QUESTION 7 A. Element B. Mixture C. Compound D. Element (4 x 1) [4] QUESTION 8 1. H2O (Example) 2. CO 3. O2 4. NH3 5. NO 6. NO2 7. CO2 8. H2 9. NH4 (8 x 1) [8] QUESTION 9 9.1 CuCO3 CuO + CO2 (1) 9.2 2HgO 2Hg + O2 (2) 9.3 (NH4)2CO3 2NH + CO2 + H2O (2) 9.4 Zn + 2HCl ZnCl2 + H2 (2) 9.5 CaCO3 + H2SO4 CaSO4+CO2 + H2O (2) 9.6 NaOH+ HCl NaCl + H2O (1) [10] TOTAL MARKS: 100