Reference answers 1.A 2.D 3.B 4.C 5.B6.D 7.A 8.C 9.A 10.B11.C 12.B 13.C 14.D 15.C16. (1) Trace amount (2) 1:3 65:4 (3)b (4) The mass fraction of zinc element in zinc carbonate is lower than zinc oxide 17.

Reference answer

1.A 2.D 3.B 4.C 5.B

6.D 7.A 8.C 9.A 10.B

11.C 12.B 13.C 14.D 15.C

16. (1) Trace amount (2) 1:3 65:4 (3)b (4) The mass fraction of zinc element in zinc carbonate is lower than zinc oxide

17. (1) 2 unchangedCH4+O2+H2

CH3OH+H2O

18.I Group (1) Test tube (2) B C 2H2O2

2H2O+O2↑

II Group (1) Place the pH test paper on the glass piece, dip a glass rod into a small amount of the liquid to be tested and drop it onto the pH test paper, and compare it with the standard color card and reading. Dilute hydrochloric acid (2) Phenolphthalein red

19. Colorless bubbles and white precipitate b Na2CO3+CaCl2=CaCO3↓+2NaCl absorbed carbon dioxide in the air 1 a

20. (1) Stable or inactive (2) 2 (3) CO liters High (4) Combination reaction d

(5) Cu2 (OH) 2CO3

2CuO+H2O+CO2↑

21. (1) Strong (2) FeSO4

(3) Solution: Let the mass of reduced iron powder required be X.

Fe+CuSO4=FeSO4+Cu

56 64

X 1000g Answer: The mass of reduced iron powder is 168g.

(4) 1.596g