NYGH 2010-S3BT2-Chem

Class Register Number Name 南洋女子中学校 NANYANG GIRLS' HIGH SCHOOL BLOCK TEST 2 Secondary Three CHEMISTRY 1 hour Wednesday 4 August 2010 0745-0845 h READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class in the spaces at the top of this page. Section A (Multiple Choice) Section A (15 MCQ) This section consists of 15 multiple choice questions. Choose the best answer and write its letter in the space provided on page 6 of the Question Paper. Section B (Structured) Answer All questions in the spaces provided on the Question Paper. Section C (Free-Response) Answer All questions in the spaces provided on the Question Paper. Submit Sections A, B and C together. INFORMATION FOR CANDIDATES The intended number of marks is given in the brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 13. Topics: 1. Acids, Bases & Salts 2. Chemical Calculations (except Solution Concentration) Examiner’s Use Section A (15 marks) Section B (20 marks) Section C (10 marks) Total (45 marks) Setter: LaiSC This document consists of 13 printed pages. NANYANG GIRLS' HIGH SCHOOL [ Turn over]

2010 Secondary Three Block Test 2 Nanyang Girls’ High School Setter: LaiSC Chemistry 2 Section A (15 marks) Choose the most suitable answer and write its letter in the answer table provided on Page 5. 1 Acid Q is used to prepare two soluble salts, as shown below. + Æ + Æ Which of the following contains correct names for Q, R and S? Q R S A Hydrochloric acid Magnesium chloride Copper(II) chloride B Sulfuric acid Magnesium nitrate Copper(II) sulfate C Hydrochloric acid Magnesium hydroxide Copper(II) chloride D Sulfuric acid Magnesium oxide Copper(II) sulfate Acid Q Base R Magnesium sulfate Copper(II) oxide Salt S Acid Q 2 Which of the following is the correct ra tio of the number of atoms in 112 g of gaseous nitrogen to the number of atoms in 90 g of ethane (C 2H6)? A 1 : 1 C 1 : 6 B 1 : 3 D 1 : 12 3 The formula of a sodium compound in silica gel is Na 2Si4Ox. What is the value of x if the relative molecular mass of the sodium compound is 302? A 8 C 10 B 9 D 12 4 5 g of element X reacted with 8 g of element Y to form a compound with the formula XY2. Given that 80 is the relative atomic mass of Y, what is the relative atomic mass of X? A 25 C 40 B 50 D 100 5 Which of the following has the largest number of atoms? A 0.1 mole of oxygen B 0.2 mole of water C 0.3 mole of carbon D 0.4 mole of helium

2010 Secondary Three Block Test 2 Nanyang Girls’ High School Setter: Lai