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歡迎您訪問數學考題練習:如圖所示,觀察硝酸鉀和氯化銨在水里的溶解度,下!

數學考題練習:如圖所示,觀察硝酸鉀和氯化銨在水里的溶解度,下

更新時間:2024-01-12 16:48:33作者:貝語網校

如圖所示,觀察硝酸鉀和氯化銨在水里的溶解度,下列敘述不正確的是

A.硝酸鉀的溶解度比氯化銨的溶解度大

B.約26℃時二者的溶解度相等

C.溫度為10℃時氯化銨的溶解度大

D.溫度為40℃時,硝酸鉀的溶解度大

試題答案

A

試題解析

根據圖象可得:溶解度的大小,按溫度分為三部分,①溫度大于0℃,小于26℃;②溫度等于26℃;③溫度大于26℃.即硝酸鉀和氯化銨在水里的溶解度大小有三種可能.

解答:只有當溫度大于26℃時,硝酸鉀的溶解度比氯化銨的溶解度大,A的結論錯誤.

故選A.

點評:正確理解函數圖象橫縱坐標表示的意義,理解問題的過程,能夠通過圖象得到函數是隨自變量的增大,知道函數值是增大還是減小,通過圖象得到函數是隨自變量的增大或減小的快慢.

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