111康軒5上自然3
Authored by 張仁彥 張仁彥
Science
5th Grade
Used 5+ times
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59 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
將甘蔗汁加熱熬煮，使水分蒸發，可以取得紅糖，這是將溶解在水中的物質取出再利用的例子。
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
發光二極體（LED）的長、短兩端分別代表正極、負極。
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
將新鮮的紫色高麗菜切成碎片後，放入熱水中浸泡，可以利用它的汁液做成酸鹼指示劑。
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
物質溶解在水中後，就消失不見了，所以我們無法利用任何方法再將物質取回。
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
進行酸鹼中和實驗時，若不小心讓手沾到強鹼水溶液，應立刻用強酸水溶液清洗，以免傷害皮膚。
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
食鹽水是中性水溶液，所以滴在紅、藍色石蕊試紙上都不會變色。
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
在酸性的檸檬水中加入糖水，使檸檬水變甜，這是酸和鹼互相作用的應用。
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