SASS Chem Revision

Page 1 ST ANDREW’S SECONDARY SCHOOL NAME TEACHING GROUP DATE DD MM YYYY Chemistry 2023 JUNE HOLIDAY REVISION PRACTICE Metals, The Periodic Table, Electrochemistry & Rate of Reaction 4 topics each with 4 sets of questions: each set consists of just 2 questions – 1 MCQ & 1 Structured. only 0.25 h / 15 min / 900 s needed each day to complete 1 set! “An 🍎 each day keeps the 👨⚕ away” apple doctor “A set 📄 each day keeps the 👻 away” questions nightmares JUNE HOLIDAYS 20232930311234567891011121314151617181920212223242526 MONTUEWEDTHUFRISATSUNGCE O-LEVEL MTGCE O-LEVEL MT ’B’VESAK DAY Semester2 Metals (1)Metals (2)Metals (3)Metals (4)Periodic Table (1)Periodic Table (2)Periodic Table (3) Periodic Table (4)Electrochemistry (1)Electrochemistry (2)Electrochemistry (3)Electrochemistry (4)Rate of Rxn (1)Rate of Rxn (2)Rate of Rxn (3)Rate of Rxn (4) BEGINS Write your answers to each set of questions on writing papers.

Page 2 METALS (1) 1 Which of the following metal oxides is most easily reduced by carbon? A CuO B Fe2O3 C MgO D ZnO 2 The Statue of Liberty in New York City was constructed in Paris, France, in the 1880s and presented as a gift to the United States of America. Its structure consists of an iron frame wrapped around with a sheet of pure copper. Due to a chemical process called patination, the copper reacted with oxygen and water in the air and became blue-green. The following chemical equations outline the steps in patination. Step 1: 4Cu (s) + O2 (g) ® 2Cu2O (s) Step 2: 2Cu2O (s) + O2 (g) ® 4CuO (s) Step 3: 2CuO (s) + CO2 (g) + H2O (l) ® Cu2CO3(OH)2 (s) The patina formed on the surface of the statue prevented copper from further oxidation. (a) (i) Determine the oxidation state of copper in CuO, Cu2O and Cu2CO3(OH)2. [3] (ii) Using the oxidation states determined in (a)(i), state with reasoning, whether each of the steps in patination is a redox reaction. [3] The iron frame eventually undergoes corrosion. However, unlike patination, corrosion of iron is considered to be destructive. (b) (i) Suggest why the corrosion of iron is considered to be destructive. [1] (ii) Is the iron frame in the Statue of Liberty expected to corrode at a faster or slower rate than usual? Provide an explanation to your answer. [2] (iii) Even though the iron frame can be protected from corrosion by coating with paint, this method was never considered. Suggest a reason why. [1] METALS (2) 3 Which of the following metals does not react with cold water, but reacts with steam to produce hydrogen gas? A Calcium B Copper C Lead D Zinc 4 Aluminium is the most abundant metallic element found on Earth, making up about 8% of the Earth’s crust. It is also the most widely used non-ferrous metal today. Aluminium does not occur natura