THE DEPARTMENT OF EDUCATION AND TRA

THE DEPARTMENT OF EDUCATION AND TRAINING TAKE SELECT GOOD STUDENTS MIDDLE SCHOOL
CITY YEAR: 2014-2015
The official title of chemical tests:
Duration: 150 minutes (not counting plays the original title)
Verse i: (runner-ups do).
Write the chemical equation to make the following chemical conversion (stating the condition react if available):
(1) (2) (3) (4) (5) (6)
Fe---> Fe3O4---> FeCl2---> Fe (OH) 2 –-– > Fe2 (SO4) 3-->--> — —-FeSO4 FeCl3.

Verse II: (4 points)
There are 6 capacity for the following solution: three (HCO3) 2, K2SO3, HCl, silver nitrate, BaCl2, NaHSO4 lost labels. A student you've numbered the bottles from (1) to (6) and then do the experiments and obtained results are as follows:
Experiment 1: Pouring the solution in the bottle (1) and (4) into the solution in the bottle (2) obtaining precipitates. White turned black apart from the air
2 experiment: Pouring the solution in the bottle (1) and (6) into the solution in the bottle (3) then exit with
* block with hydrogen is 32.
Experiment 3: Pouring the solution in the bottle (4) and sweaters (5) into the solution in the bottle (3) then appear
a white precipitate.
1. write the name of the substances contained in each vial.
2. write the chemical equation for the reaction.
3. set the observable phenomena if for the solution in the bottle (6) into the solution in the bottle (5). Write a chemical equation.

Verse III: (3 points)
A mixture of gases: CO2, Cl2, N2O. Chemical methods raise separate each gas in the mixture over (no dents) that only uses 2 of chemicals. Write a chemical equation Illustrator (if any).

Verse IV: (4 points)
1. for the solution of ZnSO4 a% to the solution three (NO3) 2 b% obtained a solution concentration c%. Formulae c under a and b. (1.5 points)
2. the ore Trona has formula xNa2CO3. yNaHCO3. zH2O (x; y and z are integers). Take two equal-mass ore samples. The first form is soluble in water and for HCl solution reacts with the residual obtained V liters of gas (Đktc). Bring the second sample by heating to constant mass, saw only the first block of 70.35% you pay, soluble in water and add a solution of HCl obtained on balance 0.75 V liters of gas (đktc). Search x; y and z.
(2.5 points).

Verse v: (6 points)
By heating a mixture of X consisting of aluminium and sulfur in the environment without oxygen. then obtained a solid a. A solid dissolved completely by 49 grams of H2SO4 solution of 12% of the obtained solution B and mix gas Y has the block with oxygen is 0.5625.
1. Using arguments prove that nAl: nS > 0.67. Identify the components of the substance in mass% X (2 points)
2. add 200 ml of a NaOH solution from M to n, then see the occurred to precipitate. Find the range of a to volume of precipitate increases occur a maximum and then decreases to the extent not modified. (1.5 points)
3. Use a intake oxygen (just enough) to burn the gas mixture so obtained gas and steam combined Z. absorption Z in aqueous lime in 5%, then saw the mass following aqueous reaction rose 1.56 grams compared to the original. Calculate volume of oxygen (đktc) burned, volume aqueous lime in salt masses and form the following response. (2.5 points)

Let: H = 1, O = 16, Zn = 65, S = 32, Three = 137, N = 14, Al = 27, Na = 23, Ca = 40, Cl = 35.5
--------------HẾT-----------
* Supervisor does not explain anything more. Participants may not use the material.