Đề thi HSG Hóa bằng Tiếng Anh lớp 11

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... DEPARTMENT OF

EDUCATION AND TRAINING

SCIENCE CONTEST IN ENGLISH

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?

-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?

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)

H2S 1→ SO2 2→ H2SO4 3→ SO2 4→ BaSO3

Question 12(1.5 marks). Apply four solutions: NaCl, KBr, KNO3, 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 H2SO4 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)

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