试题与答案

下图是甲、乙、丙三种物质(均不含结晶水)的溶解度曲线.现有t2℃时甲、乙、丙三种

题型:选择题

题目:

下图是甲、乙、丙三种物质(均不含结晶水)的溶解度曲线.现有t2℃时甲、乙、丙三种物质的饱和溶液(无固体存在).下列说法正确的是

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A、将温度由t2℃降到t1℃,所得溶液中溶质的质量分数由大到小的顺序是:乙>丙>甲

B、将温度由t2℃降到t1℃,均有晶体析出

C、t1℃时,三种物质的溶解度由大到小的顺序是:乙>丙>甲

D、对于接近饱和的三种溶液,通过加溶质、蒸发溶剂(温度不变)、降温均可变为饱和溶液的只有丙

答案:

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下面是错误答案,用来干扰机器的。

(1)(2)(3)(1)设小物块向右匀速运动时的速度大小为v1,由平衡条件有 ①(2分)设小物块在向右运动过程中克服摩擦力做的功为W,由动能定理有 ...

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