理化第三冊第二章-物質世界
Quiz
•
Science
•
9th Grade
•
Practice Problem
•
Hard
李敏瑜 李敏瑜
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23 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A
B
C
D
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
棉花糖是許多人小時候的重要記憶,其具有的色、香、味,總能吸引小朋友停下腳步。棉花糖的製作過程如下:把蔗糖(C12H22O11)的固態糖塊倒進小型加熱罐,罐口周圍開有許多小孔;開孔位置位於一個大型金屬容器的底面上。當加熱罐把糖熔化為液體後,整個裝置開始旋轉。
然後,從加熱罐頂部的小孔中開始噴射出體積極小的液態糖滴,旋轉時,糖滴被甩出小孔,在空氣中凝結成為一條條肉眼幾乎不可見的糖絲。
在這個熔化與噴射過程中,糖的表面積增大了無數倍,在冷空氣中迅速由液態凝固成固態。此時,整個金屬容器內充滿了大量細小的糖絲,只需用一根錐形紙棒就可將其收集,並捲繞成我們熟悉的棉花糖形狀。
關於糖塊倒入加熱罐後變成液體的過程,下列何者正確?
吸熱的物理變化
放熱的物理變化
吸熱的化學變化
放熱的化學變化
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
棉花糖是許多人小時候的重要記憶,其具有的色、香、味,總能吸引小朋友停下腳步。棉花糖的製作過程如下:把蔗糖(C12H22O11)的固態糖塊倒進小型加熱罐,罐口周圍開有許多小孔;開孔位置位於一個大型金屬容器的底面上。當加熱罐把糖熔化為液體後,整個裝置開始旋轉。
然後,從加熱罐頂部的小孔中開始噴射出體積極小的液態糖滴,旋轉時,糖滴被甩出小孔,在空氣中凝結成為一條條肉眼幾乎不可見的糖絲。
在這個熔化與噴射過程中,糖的表面積增大了無數倍,在冷空氣中迅速由液態凝固成固態。此時,整個金屬容器內充滿了大量細小的糖絲,只需用一根錐形紙棒就可將其收集,並捲繞成我們熟悉的棉花糖形狀。
關於文中所提到的棉花糖製作過程,從固體糖塊到拉成糖絲的敘述,下列何者正確?
(A)(B)(C)
(D)
糖塊的成分為化合物
糖塊與糖絲沒有固定熔點
是化合物變成混合物的過程
過程中,組成糖的原子會重新組合成新物質
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
甲:蠟固體熔化成蠟油
乙:蠟油沿燭芯上升,並汽化成蠟蒸氣
丙:蠟蒸氣燃燒產生光、熱、二氧化碳和水
蠟蠋燃燒全部過程都是化學變化
蠟燭燃燒全部過程都是物理變化
蠟燭燃燒過程,甲是物理變化,乙丙是化學變化
蠟燭燃燒過程,甲乙是物理變化,丙是化學變化
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A
B
C
D
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A
B
C
D
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A
B
C
D
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