Đề kiểm tra học kỳ 2 môn Hóa học Lớp 11 - Năm học 2019-2020

Nội dung text: Đề kiểm tra học kỳ 2 môn Hóa học Lớp 11 - Năm học 2019-2020

1. DEPARTMENT OF SCIENCE CONTEST IN ENGLISH EDUCATION AND TRAINING School year: 2019 – 2020 Date: 10th October, 2019 OFFICIAL PAPER Subject: CHEMISTRY Full name: Student code: Signature: . PART I: MULTIPLE-CHOICE (4 marks) Question 1. All atoms in halogen group all have? A. three electrons in the last shell B. five electrons in the last shell C. seven electrons in the last shell D. eight electrons in the last shell Question 2. The acidity of acid solution HX sort in descending order in which answer? A. HF, HCl, HBr, HI B. HI, HBr, HCl, HF C. HCl, HBr, HI, HF D. HBr, HCl, HI, HF Question 3. All substances in which answer effect to clo ? A. Fe, H2O, H2 B. KF, KOH, H2O C. O2, H2O, NaI D. Fe,O2,K Question 4. Put a gram KMnO4 completely effect to concentrated HCl solution, residual and obtained 5.6 liters of Cl2 gas in standard conditions. What is the value of a ? A. 15,8 gram B. 10,58 gram C. 20,56 gram D. 18,96 gram Question 5. Which of the following is composed of substances that only react with concentrated H2SO4 acid, but not dilute H2SO4? A. Ba(NO3)2, BaCl2 B. MgO, CuO, Al2O3 C. Na, MgO, Zn D. Cu, C, S Question 6. Which of the following ranges contain the oxidation numbers for sulfur? A. -2; -4 ; +6 ; +8 B. -1; 0 ; +2; +4 C. -2; 0 ; +4 ; +6 D. -2; -4 ; -6 ; 0 Question 7. In the following response: SO2 + 2H2S → 3S + 2H2O Which of the following statements correctly describes the nature of the substances involved in the reaction? A. Sulfur is oxidized and hydrogen is reduced B. Sulfur is oxidized and no substance is oxidized C. Sulfur is reduced and hydrogen is oxidized D. Sulfur in SO2 is reduced and sulfur in H2S is oxidized Question 8. CO2 gas has impurities - SO2. Which of the following solutions should be aired to remove impurities? Page 1
2. A. Ba(OH)2 solution (residual) B. Br2 solution (residual) C. Ca(OH)2 solution (residual) D. NaOH solution (residual) Question 9. Apply 31 grams of a mixture of metals: Fe, Al, Mg, Cu effect with excess dilute sulfuric acid. After the reaction, a solution containing m grams of sulfate salt is obtained; 12.8 grams of an insoluble solid and 15.68 liters of H2 gas under standard conditions. What is the value of m? A. 85,4 gram B. 98,2 gram C. 86,8 gram D. 87,5 gram Question 10. Which of the following is incorrect? A. All reaction must reach a state of chemical equilibrium B. Chemical equilibrium is dynamic equilibrium C. Only reversible reactions have a state of chemical equilibrium D. In the equilibrium of the reversible reaction, there always have reagents and products present Question 11. Giving the same amount of aluminum with a volume of 0.1 M HCl, what is the highest reaction rate when using aluminum in the following form? A. Small tablet form B. Fine powder form, stir well C. Thin sheet form D. Aluminum wire form Question 12. Give the following chemical equilibrium: N2 (k) + 3H2 (k) 2NH3 (k) (1) H2 (k) + I2 (k) 2HI (k) (2) 2SO2 (k) + O2 (k) 2SO3 (k) (2) 2NO2 (k) N2O4 (k) (4) When changing the overall pressure of the system, which the chemical equilibrium is shifted? A. (1), (2), (4) B. (1), (3), (4) C. (1), (2), (3) D. (2), (3), (4) PART II. ESSAY (6 marks) Question 1(2 marks). Write chemical equations to complete the following diagram, specify reaction conditions (if any) 1 2 3 4 H2S → SO2 → H2SO4 → SO2 → BaSO3 Question 12(1.5 marks). Apply four solutions: NaCl, KBr, KNO 3, K2SO4 store in separate jars, lost the label. By chemical method, please recognize the above solutions? Write the chemical equation occurs? Question 13(2.5 marks). Giving 48,91 ml of hot, concentrated H 2SO4 acid solution (density of acid solution is: d = 1,84 g / ml) sufficiently effect with 33,6 grams of mixture A consisting of Cu and CuO. After the reaction, solution B is obtained and 8.96 liters (under standard conditions) of SO2 gas are released (the only reducing product). a. Write the chemical equations happening (1 mark) b. Calculate the percentage mass fraction of each substance in mixture A? (1 mark) c. Calculate the percentage concentration of solute in solution B and the percentage concentration of the solution of sulfuric acid used (0,5 mark) THE END Page 2
3. Page 3