First, multiple-choice questions (this question contains 20 small questions, each with 2 points and ***40 points)

Preface 1 23455 6789 10

Answer A B B C D A D C C D

Foreword11213141516171819 20.

Answer B C A B D D D B B A

Second, this question includes 5 small questions, with ***32 points.

2 1.(9 points) 1 minute per grid.

( 1)N2； 4P2O5H2O； 5Ag6 NO3-； soda

(2) The oxygen molecule contains two oxygen atoms; Ferrous ions have a positive charge of 2 units.

(3)Fe2(SO4)3====2 Fe3+ + 3 SO42-

22.(7 points)

(1) Wang Hua and angel lee (write one point for each person, and the other way around if you write too much. ) (* * * 2 points)

(2) Any three key data points are connected, and each line scores 1 (***2).

(3)t & lt； 20゜C, or 0 degrees Celsius

(4) greater than (1)

(5) 135g( 1)

23.(7 points) 2 points for each equation.

Calcium oxide+H2O = = = calcium hydroxide

Ca (oh) Ca (oh) 2+cuso4 = = = caso4+Cu (oh) 2 ↓ (no penalty)

Fe+CuSO4 = = = FeSO4+Cu replacement (1 min)

24.(5 points)

(1) The snow melting agent is dissolved in water (or after step 1) to form a colorless solution; ( 1)

(2) MgCl2+2 NaOH = = 2 NaCl+Mg (OH) 2 ↓ (2 points, 1 is unbalanced or ↓ * *).

(3) magnesium chloride and sodium chloride; ; MgCl2 and NaNO3 (each 1, * * * each 2)

25.(4 points)

( 1) 100( 1)

(2)9( 1)

(3)3.96g (1 is data and unit, and 2 is * * *).

Three, this question includes four small questions, ***28 points.

26.(9 points)

(1) iron shelf; Gas containers (each 1, * * * each 2)

(2)④( 1)

(3) Re-ignite the battens with Mars; When the liquid is taken in step II, the bottle stopper is not inverted; Step 4: When the bottle is full, you can't put the wooden stick with Mars in the bottle. (65438 +0, ***3)

(4 4) CaCO3+2hcl = = = CaCl2+H2O+CO2 = CO2 = or Zn+H2SO4 = = ZnSO4+H2 =; (Write the equation at will to give 2 points, if there is no balance or ↑ * *, deduct 1 point).

Alcohol lamp (1 min).

27.(4 points)

(1) Exhaust air dissolved in water; ( 1)

(2) Prove whether iron products are rusted (or corroded) when only water exists; Prove whether iron products rust when only dry air (or oxygen) exists. (Other reasonable descriptions are also given points) (65438+ 0 points per grid, ***2 points)

(3) The corrosion of iron products must be accompanied by water and oxygen (other reasonable descriptions are also given). ( 1)

28.(6 points)

(1) the amount of manganese dioxide; Yes (65438+ 0 points for each space, ***2 points)

(2) Under other conditions, the higher the concentration of hydrogen peroxide, the faster the reaction speed; (,premise 1, conclusion 1, ***2)

(3) 10%; 0.2 (per space 1 point, ***2 points)

29.(9 points)

(1) 3CO+3Fe2O3 2Fe+3CO2(2 points, no balance or unconditional deduction 1 minute).

(2)(* * 6 points)

Experimental steps, experimental phenomena and conclusions

1. Pour a proper amount of clarified limewater into the bottle and shake. (1) The limewater in the gas container becomes turbid (1), indicating that the gas contains carbon dioxide. ( 1)

2. Put the burnt wood strips into the residual gas of step 1. ( 1)

A blue flame (exothermic) or gas combustion (1) in the gas container indicates that the gas contains carbon monoxide. ( 1)

(3) Ignition (or put a lighted alcohol lamp at the tail gas outlet) (1)