请从下列物质中选择适当的物质填空(填字母)。 A.活性炭   B.天然气

请从下列物质中选择适当的物质填空(填字母)

A.活性炭   B.天然气   C.熟石灰   D.氮气   E.小苏打

(1)用于改良酸性土壤______

(2)常用作燃料______

(3)用作食品保护气______

(4)用于去除冰箱中的异味______

(5)用作发酵粉的主要成分______

(6)上述五种物质在使用中发生化学变化的是______(填两种)

答案

(1)C  (2)B  (3)D  (4)A  (5)E  (6)CB

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