Grade 10 Physical Science 2017 Paper 2

Question 9

by

Study the water cycle below and answer the questions that follow. 9.1 The water cycle consists of many processes.Identify the following processes: 9.1.1 A (1) 9.1.2 B (1) 9.1.3 E (1) 9.2 Is energy ABSORBED or RELEASED during condensation? Give a reason forthe answer. (2) 9.3 Give ONE reason why water vapour is referred to … Read more

Question 8

by

Your teacher asked you to use your knowledge of precipitation reactions to test the quality of water in the local river. You are provided with the following chemicals: AgNO3, BaCl2, dilute HNO3 8.1 Which chemical would you choose to test for the presence of carbonates (CO3-2)? (1) 8.2 Use a balanced chemical equation to show … Read more

Question 7

by

Learners investigated the relationship between the concentration of a silver nitrate (AgNO3) solution and its conductivity at a constant temperature. They set up the apparatus, as shown below, and recorded the current. The initial reading of the ammeter was taken before anhydrous AgNO3 was added to distilled water. The anhydrous AgNO3 was added to 200 … Read more

Question 6

by

6.1 Study the balanced chemical equation of the reaction between sodium carbonate (Na2CO3) and hydrochloric acid (HCâ„“) and answer the questions that follow. Na2CO3 + 2HCâ„“ → 2NaCâ„“ + CO2 + H2O Identify the type of reaction above. Choose between REDOX and GAS FORMING. (1) 6.2 In a reaction, 10,6 g of sodium carbonate reacts … Read more

Question 5

by

Hydrogen peroxide decomposes at room temperature according to the following balanced chemical equation: 2H2O2(aq) → O2(g) + 2H2O(â„“) 5.1 What does the (aq) represent in the equation above? (1) 5.2 Identify the type of reaction above. Choose between PRECIPITATION and REDOX. Give a reason for the answer. (2) 5.3 Is the reaction an example of … Read more

Question 3

by

Consider the graph of the first ionisation energy and answer the questions that follow. 3.1 Define the term ionisation energy. (2) 3.2 State the general trend in ionisation energy from left to right across a periodon the periodic table. (2) 3.3 There is a drop in ionisation energy from beryllium to boron. 3.3.1 Write down … Read more

Question 2

by

Consider the following substances: C90; NaCâ„“; CO2; Fe; H2O 2.1 Write down a substance from the list above that is the following: 2.1.1 A molecular structure (1) 2.1.2 A metallic structure (1) 2.1.3 A covalent network structure (1) 2.1.4 An ionic network structure (1) 2.2 Draw the Lewis dot diagram for the CO2 molecule. (2) … Read more