10 JUNE S2 NW 9 NS QP JUNE 24

PROVINCIAL ASSESSMENT GRADE 9 NATURAL SCIENCES JUNE 2024 Marks : 60 Duration: 90 minutes This question paper consists of 9 pages and an Annexure. Copyright reserved Please turn over

Natural Sciences 2 NW/June 2024 Grade 9 INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. Answer ALL the questions. 2. Write ALL answers in the ANSWER BOOK. 3. Start the answers to EACH question at the top of a NEW page. 4. Number the answers correctly according to the numbering system used in this question paper. 5. Present your answers according to the instructions for each question. 6. All the drawings should be in pencil, neat and fully labelled. 7. A non-programmable calculator, protractors and compasses may be used where applicable. 8. Write neatly and legibly. Copyright reserved Please turn over

Natural Sciences 3 NW/June 2024 Grade 9 SECTION A QUESTION 1 1.1 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. e.g. 1.1.6 B 1.1.1 The smallest particles that make up matter are known as … A molecules. B atoms. C elements D compounds. (1) 1.1.2 Group 1 elements are soft metals that react violently with water and oxygen. These metals are called … A transition metals. B alkali metals. C noble gases. D alkali earth metals. (1) 1.1.3 If a solution is acidic, it can be neutralized by adding … A heat. B strong acid. C weak acid. D a base. (1) 1.1.4 A chemical reaction in which an acid react with a base to produce salt and water. A Rusting B Corrosion C Neutralisation D Combustion (1) 1.1.5 Identify a chemical reaction which is balanced from those provided below: A H2 + O2 → H2O B H + O →H2O C 2H2 +O2 → 2H2O D H2O + O2 →2H2O (1) [5] Copyright reserved Please turn over

Natural Sciences 4 NW/June 2024 Grade 9 1.2 Give ONE word/term for each of the following statements. Write only the word/term next to the question number. 1.2.1 Reactions that involve the burning of substances. (1) 1.2.2 Positively charged particles within an atom. (1) 1.2.3 A chemical equation where the reactants and the products have the same number of atoms of each element. (1) 1.2.4 Horizontal rows on the periodic table. (1) 1.2.5 A product of a chemical reaction between a metal and oxygen. (1) [5] 1.3 Choose the TERM in COLUMN B that best matches the statement in COLUMN A. Write ONLY the matching letter (A–H) next to the question number (1.3.1-1.3.5), eg. 1.3.7 G COLUMN A COLUMN B 1.3.1 Arrangement of all the known elements A Indicator 1.3.2 A substance that changes colour depending on the pH of the solution in B Atomic number which it is placed C Products 1.3.3 Number of protons in the nucleus of an atom. D Periodic Table 1.3.4 Substances that react together in a chemical reaction. E Reactants 1.3.5 Elements that have properties of metals and non-metals. F Semi metals G Alkali metals [5] TOTAL SECTION A 15 Copyright reserved Please turn over

Natural Sciences 5 NW/June 2024 Grade 9 SECTION B QUESTION 2 2.1 Study the information in the table below and answer the questions that follow. STRUCTURE USED TO REPRESENT NAME OF SUBSTANCE FORMULA MOLECULES OF THE VARIOUS SUBSTANCES Carbon dioxide CO2 Methane CH4 Oxygen gas O2 Water H2O Sodium Na Use the information in the table and write BALANCED CHEMICAL EQUATIONS for the reactions represented by the following structures: 2.1.1 (3) 2.1.2 + (3) [6] Copyright reserved Please turn over

Natural Sciences 6 NW/June 2024 Grade 9 3.1 The following is an example of a balanced chemical equation: CO + H2O CO2 + H2 3.1.1 Provide the SCIENTIFIC NAME given to all the substances on the right-hand side of the arrow in a chemical equation. (1) 3.1.2 Provide NAMES of the two products which are the results of the above chemical reaction. (2) [3] QUESTION 4 4.1 When certain metals react with oxygen in the presence of moisture they corrode. When a spanner, consisting mainly of iron is left outside in the rain, a thin layer of a reddish- brown powder starts to form on its surface within a few weeks. 4.1.1 Name the PROCESS that take place when iron reacts with oxygen in the presence of moisture. (1) 4.1.2 Provide the COMMON NAME given to the reddish- brown powder that is observed after a few weeks. (1) 4.1.3 Suggest three ways in which the process named in 4.1.2 can be (3) prevented. 4.1.4 Use chemical formula to write a BALANCED CHEMICAL EQUATION for the above chemical reaction. (4) [9] Copyright reserved Please turn over

Natural Sciences 7 NW/June 2024 Grade 9 QUESTION 5 5.1 Study the diagram below and answer the questions based on it: Carbon (coal is mainly carbon) burns in enough oxygen with a bright luminous yellow flame and produce a gas. The gas is invisible and has no smell. 5.1.1 Explain what happens when a non-metal reacts with oxygen. (2) 5.1.2 Name the substance, which is a source of carbon that can be used for the above experiment. (1) 5.1.3 Name the invisible gas product. (1) 5.1.4 Write the chemical formula of the PRODUCT. (1) 5.1.5 Explain how can one test for the product to prove that this specific product was formed. (2) 5.1.6 Name the environmental problem that is likely caused by people burning too much fuel that contains carbon. (2) [9] Copyright reserved Please turn over

Natural Sciences 8 NW/June 2024 Grade 9 QUESTION 6 6.1 The following graph represents the change in pH of a 25cm 3 sodium hydroxide solution as dilute hydrogen chloride is being added to it. The indicator bromothymol blue was added beforehand to the sodium hydroxide solution. 6.1.1 State the possible hypothesis for this experiment. (2) 6.1.2 Identify the dependent variable. (1) 6.1.3 Identify the independent variable. (1) 6.1.4 Give the initial pH of the sodium hydroxide, before adding hydrochloric acid. (1) 6.1.5 Name the pH of the content in the beaker at the end point. (1) 6.2 Neutralisation reactions form a solution that has a neutral solution. 6.2.1 Name ANY THREE (real life) uses of neutralisation reactions. (3) 6.3 Complete the following chemical reactions of acids and bases: 6.3.1 HCl + NaOH → … + H2O (1) 6.3.2 H2SO4 + Mg(OH)2 →… + 2H2O (1) [11] Copyright reserved Please turn over

Natural Sciences 9 NW/June 2024 Grade 9 QUESTION 7 ACTIVITIES THAT LEAD TO ACID RAIN 7.1 7.1.1 Identify one of the gases that contribute to the formation of acid rain. (1) 7.1.2 Name at least two sources of these gases. (2) 7.1.3 Explain how acid rain affect the environment negatively. (2) 7.1.4 Suggest one possible solution to the formation of acid rain. (2) [7] TOTAL SECTION B: 45 GRAND TOTAL: 60 Copyright reserved

Natural Sciences 1 NW/June 2024 Grade 9 ANNEXURE A: PERIODIC TABLE Copyright reserved