A. It will turn blue B. It will turn red C. It will turn black D. It will not change color 相关知识点: 试题来源: 解析 B。解析:柠檬汁是酸性物质。石蕊试纸(litmus paper)遇酸性物质会变红,遇碱性物质会变蓝。因为柠檬汁是酸性的,所以石蕊试纸会变红,而不是变蓝、变黑或者不变色,所以A、C...
结果1 题目 Which mixture of gases would not change the colour of a damp blue litmus paper when they are tested separately? C A carbon dioxide and ammonia B chlorine and nitrogen C hydrogen and ammonia D nitrogen and hydrogen chloride 相关知识点: 试题来源: 解析 C 反馈 收藏 ...
British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world. But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It’s hard...
Red scale residue (COPPER II) partly dissolves in dilute acid to form a pale blue solution. Name the pale blue solution An unknown solution gave a red flame and no precipitate with any of the reagents in the solubility test. The halide test gave a faint yellow...
That unhappy experience – it turns out was a “happy fault” – provided the catalyst for beginning a new fraternity. By 1970, Father Calkins, together with three or four others, made an “engagement” (pronounced the French way)—a commitment to live the charism of Brother Charles through...
Newsreel and newspaper before 1939 was black & white. It was not until August 1939 when Dorothy landed in Oz that Color came into our world. The moment she stepped onto the yellow brick road, we have hadTechnicolor,KodachromeandJonas and Gillian’seternal Blue & Red shirts. Can you imagine...