Question 1
1 mark小明在科學課上進行了一系列實驗。下列哪一個實驗現象屬於物理變化？
Primary School · Science
Physical Changes and Chemical Changes: Practice Questions
5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Physical Changes and Chemical Changes.
10 questions23 marksFree, no account
Question 2
1 mark關於化學變化的描述，下列哪一項是正確的？
Question 3
1 mark物質的變化可以是物理的或化學的。下列關於可逆性的說法，哪一項是正確的？
Question 4
1 mark小明在科學實驗中觀察到以下現象。下列哪一個現象屬於物理變化？
Question 5
1 mark根據課程指引，判斷「物理變化」與「化學變化」的最主要依據是什麼？
Question 6
2 marks小明在科學實驗室將一塊圓形的泥膠用力壓扁。請問泥膠的形狀改變屬於什麼變化？
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Question 7
3 marks在觀察蠟燭燃燒時，蠟油流下的現象與棉芯變黑產生煙霧的現象分別屬於哪種變化？
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Question 8
5 marks在一個密封實驗中，物質 A 與 B 混合後溫度上升並變成了顏色不同的新物質 C。小明認為這涉及了能量的變化。請判斷這屬於哪種變化並說明理由。
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Question 9
4 marks小明在科學課上進行了兩個實驗：
實驗一：把一小勺食鹽放入一杯溫水中攪拌，直到食鹽完全消失。
實驗二：將一根鐵釘放在潮濕的室外一週，發現鐵釘表面出現了紅褐色的物質。
(a) 實驗一中發生的變化是物理變化還是化學變化？請說明一項理由。(2分)
(b) 實驗二中發生的變化涉及了新物質的產生嗎？這屬於哪種變化？(2分)
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Question 10
4 marks小明嘗試區分「熔化」與「燃燒」。他將蠟燭點燃，觀察到：
(1) 蠟燭頂部的蠟受熱變成液體流下。
(2) 棉芯燃燒，火焰發出光和熱。
(a) 請分別指出過程(1)和(2)的變化類型。(2分)
(b) 雖然過程(1)中蠟的形狀改變了，但它是可逆轉的嗎？請解釋如何證明。(2分)
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