NYGH 2014-S3MYE-Chem P1

Class Register Number Name NANYANG GIRLS’ HIGH SCHOOL Mid-Year Examination 2014 Secondary Three CHEMISTRY 1 hour 30 minutes Section A Multiple Choice Tuesday 6 May 2014 1145- 1315 Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the Multiple Choice Answer Sheet provided. There are twenty questions in this paper. Answer all questions. For each question there are four possible answers, A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the answer sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. The periodic table can be found on page 8. Setter: NHK This document consists of 8 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2014 Mid-Year Examination Secondary Three 2 Nanyang Girls’ High School Setter: NHK Chemistry/MCQ 1 Which of the following diagram represents the change in the arrangement of particles during the condensation process? A B C D 2 Which apparatus is most suitable to obtain water from a mixture of sand and water? A B C D 3 The diagram below shows the apparatus used to separate hexane (boiling point. 70oC) and heptane (boiling point, 98oC). sand and water sand and water sand and water sand and water T

2014 Mid-Year Examination Secondary Three 3 Nanyang Girls’ High School Setter: NHK Chemistry / MCQ [Turn over Which graph would be obtained if the temperature at point T was plotted against the total volume of distillate collected? A B C D 4 Which sub-atomic particle do atoms of 27 13Al and 28 14Si have the same number? A electrons B protons C neutrons D nucleons 5 The elements X and Y form the compound with a chemical formula of X2Y3. What is the correct electron arrangement of the atoms of X and Y? atom of X atom of Y A 2, 8, 2 2, 8, 3 B 2, 8, 6 2, 8, 3 C 2, 8, 3 2, 8, 6 D 2, 8, 2 2, 8, 6 6 Which of the following molecules contains six shared electrons? A CH4 B CO2 C H2S D NCl3 7 Which oxide has a simple molecular structure? A MgO B Al2O3 C SiO2 D P2O5 temperature/oC 100 90 80 70 total volume of distillate temperature/oC 100 90 80 70 total volume of distillate temperature/oC 100 90 80 70 total volume of distillate temperature/oC 100 90 80 70 total volume of distillate

2014 Mid-Year Examination Secondary Three 4 Nanyang Girls’ High School Setter: NHK Chemistry/MCQ 8 The table gives information about the ability of three substances to conduct electricity. Substance Property W does not conduct under any conditions X conducts when molten and when solid Y conducts when molten and in aqueous solution What could these three substances be? W X Y A Fe MgCl2 NH3 B N2 Fe MgCl2 C MgCl2 Fe NH3 D MgCl2 N2 Fe 9 Which of the following oxides is unlikely to dissolve in aqueous sodium hydroxide? A Al2O3 B CaO C P4O10 D SiO2 10 Arsine, AsH 3 is a gas used in the semiconductor industry to manufacture microchips. It behaves like ammonia when dissolves in water. Which of the following ions will be produced when arsine dissolves in water? A AsH3 +, H+ B AsH4 +, H+ C AsH3 +, OH− D AsH4 +, OH− 11 In order for plants to grow well, pH of the soil must be controlled and essential nutrients of nitrogen, phosphorus and potassium must be added. Lime, CaO , is use d to reduce the acidity of soil. A mmonium sulfate is a nitrogenous fertiliser. Why is it that the two substances are not added together in damp soil? A Sulfuric acid will form. B The dry mixture is explosive. C Ammonia gas is given off. D Calcium oxide is acidic oxide.

2014 Mid-Year Examination Secondary Three 5 Nanyang Girls’ High School Setter: NHK Chemistry / MCQ [Turn over 12 When a mixture of white solids, Z is treated with an excess of dilute hydrochloric acid, a colourless gas is evolved and some, but not all, of the mixture dissolves. Which mixture could be Z? A Ba(NO3)2 and Ca(OH)2 B BaSO4 and CaCO3 C CaCO3 and MgSO4 D Ca(OH)2 and MgCO3 13 Which of the following salts can be prepared by an acid-alkali titration method? A aluminium sulfate B ammonium sulfate C copper(II) sulfate D zinc sulfate 14 Two precipitates can be prepared from reacting compound W with aqueous potassium iodide, KI(aq) and aqueous barium chloride, BaCl2(aq). What could compound W be? A AgNO3 B CaSO4 C Ca(NO3)2 D PbSO4 15 Which one of the following equations represents the reaction that occurs when calcium carbonate is heated strongly? A CaCO3 → CaO + CO B 2CaCO3 → 2CaO2 + CO2 C CaCO3 → CaO + CO2 D 2CaCO2 → Ca2O + 2C + 2O2 W(aq) pale yellow precipitate white precipitate KI(aq) BaCl2(aq) precipitate does not dissolve colourless solution NH3(aq) NH3(aq)

2014 Mid-Year Examination Secondary Three 6 Nanyang Girls’ High School Setter: NHK Chemistry/MCQ 16 Which of the following equations represents the ionic equation for the reaction between sodium carbonate and dilute sulfuric acid? A CO3 2−(aq) + 2H+(aq) → H2CO3(aq) B CO3 −(aq) + H+(aq) → HCO3 −(aq) C CO3 2−(aq) + 2H+(aq) → CO2(g) + H2O(l) D CO3 2−(aq) + H2(g) → CO2(g) + H2O(l) 17 An aqueous solution containing a mixture of copper(II), lead(II) and zinc ions was treated with an excess of aqueous ammonia. What is the resulting precipitate(s)? A copper(II) hydroxide only B lead(II) hydroxide only C zinc hydroxide and lead(II) hydroxide D zinc hydroxide and copper(II) hydroxide 18 The diagram represents an unsuccessful attempt to prepare and collect sulfur dioxide. Which modification would make the experiment successful? A omitting flask P entirely B collecting the gas by upward delivery C using dilute sulfuric acid instead of dilute hydrochloric acid D using water in flask P instead of aqueous potassium hydroxide 19 On passing carbon dioxide into an aqueous solution of P, a white precipitate, Q is formed. This disappears when more carbon dioxide is passed, forming a colourless solution of R. What could be the formulae of compounds, P, Q and R? P Q R A Ca(OH)2 CaCO3 Ca(HCO3)2 B Ca(OH)2 Ca(HCO3)2 CaCO3 C CaCO3 Ca(OH)2 Ca(HCO3)2 D CaCO3 Ca(HCO3)2 Ca(OH)2 dilute hydrochloric acid sodium sulphite, Na2SO3 concentrated sulfuric acid aqueous potassium hydroxide heat

2014 Mid-Year Examination Secondary Three 7 Nanyang Girls’ High School Setter: NHK Chemistry / MCQ [Turn over 20 In a labora tory experiment, oxygen is produced when aqueous hydrogen peroxide is decomposed in the presence of copper(II) oxide as a catalyst. A catalyst is a substance which increases the speed of a chemical reaction and remains chemically unchanged at the end of the reaction. What did the tube contain when the reaction was complete? A a black solid and a colourless liquid B a light blue solid and a colourless liquid C a black solid and a blue liquid D a blue liquid only ---------------------------------- End Of Paper -------------------------------------

2014 Mid-Year Examination Secondary Three