(6) "Honesty" is a fine tradition of the Chinese nation, but at present, there are criminals who mix calamine (ZnCO 3), copper oxide (Cu 2 O) and charcoal powder.

(6 points) (1) Burning (reasonable answers such as measuring the density of alloy in acid solution are acceptable, 1 minute).

(2) 128: 65 (2 points)

(3) solution: assume that the mass of Cu 2 O consumed by 26.4gCO 2 is x.

ZnCO 3 +C+Cu 2 O Zn+2Cu+2CO 2 ↑

144 2×44

x 26.4g？

X = 43.2g ................ (1).

A: if you get 26.4 grams of CO 2, the mass of Cu 2 O consumed is 43.2 grams.

(4) Any slogan related to "honesty and law-abiding" will do. ( 1)

Analysis: According to the properties of gold, copper and zinc, zinc can react with acid, but gold cannot react with acid; And the meaning of chemical equation, which represents the analytical solution of the mass ratio of reactants to products.

(1) Zinc can react with acid, but gold can't. Alloys can be identified in acidic solution or burned. The surface of "pseudo-gold" turns black or the solid density is measured according to the density.

(2)ZnCO 3 +C+Cu 2 O Zn+2Cu+2CO 2 ↑

65? 128

Therefore, the mass ratio of copper to zinc in the obtained copper-zinc alloy is128: 65;

(3) Solution: Assume that the mass of Cu 2 O consumed by 26.4gCO 2 is X. 。

ZnCO 3 +C+Cu 2 O Zn+2Cu+2CO 2 ↑

144? 2×44

x26.4g

x=43.2g？

Answer: If you get 26.4 grams of carbon dioxide, the mass of cuprous oxide consumed is 43.2 grams.

(4) Be proud of honesty and trustworthiness, and be ashamed of forgetting righteousness at the expense of profit (any slogan related to "honesty and law-abiding" will do).

Answer: (1) Put the alloy in an acidic solution (or burn it, measure the density, etc. );

(2) 128:65;

(3) If 26.4g of CO 2 is obtained, the mass of Cu 2 O consumed is 43.2g; ;

(4) Be proud of honesty and trustworthiness, and be ashamed of forgetting righteousness at the expense of profit (any slogan related to "honesty and law-abiding" will do).

Comments: Gold is the weakest metal in the metal activity sequence table and generally does not react with other substances; The activity of copper and zinc in copper-zinc alloy is greater than that of gold, so we can distinguish copper-zinc alloy from gold by different properties.