1)錫的溶點是232'c,而爐火的溫度可高達800'C.為什麼用錫補過的水煲可用來煮沸食水?
2)一個正立方體鉛塊的邊長為5cm,其質量為1.4kg.試計算該鉛塊的密度.(答案以g cm3 為單位)
中一科學~物質~急急急急>
2009-08-23 6:30 am
回答 (2)
2009-08-23 8:22 am
✔ 最佳答案
1. Tin(錫), being a metal, is a good conductor of heat. Although the temperature of the fire is much higher than the boiling point of tin, the heat produced by the fire is rapidly conducted away by the tin to the water. Hence, the temperature of the tin and the pot would not be much higher than the temperature of the boiling point of water.2. 1.4 kg = 1.4 x 1000 g = 1400
volume of cube = 5 x 5 x 5 cm3
hence density = 1400/125 g/cm3 = 11.2 g/cm3
2009-08-23 7:03 am
1.因為火的溫度沒有完全到達錫個到。
2.根據密度公式.密度=質量/體積..d=1400g/125cm³
..密度為11.2g/cm³
2.根據密度公式.密度=質量/體積..d=1400g/125cm³
..密度為11.2g/cm³
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