若想區別食鹽水溶液和糖水,下列哪一種方法最適當?
2下3-1

Quiz
•
Chemistry
•
8th Grade
•
Medium
Ya Ying Chang
Used 2+ times
FREE Resource
25 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
是否可讓LED燈發亮
聞聞看
以石蕊試紙檢驗
比較顏色
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
關於電解質的說法,下列哪一項是正確的?
由銅線可以導電,可知銅是電解質
由固體的食鹽不能導電,可知食鹽不是電解質
由酒精易溶於水,可知酒精是電解質
由鹽酸是氯化氫的水溶液,能導電,可知氯化氫是電解質
3.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
小軒配置相同濃度的糖水、食鹽水及鹽酸。結果因為忘記貼上標籤,所以把三杯水溶液搞混了。於是小軒使用附圖的裝置進行檢驗,發現只有甲杯水溶液無法使LED燈發亮,只有乙杯可使藍色石蕊試紙變色。則關於這三杯溶液的組合,下列哪一項是正確的?
A
B
C
D
4.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
已知某原子X的質子數為17、中子數為18,則此原子所形成的離子X-,應具有的電子數目為多少?
16
18
34
36
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
下列關於鈉離子(Na+)和鈉原子(Na)的比較,何者正確?
原子序相同
電子數相同
化學性質相同
鈉原子獲得一個電子後,形成鈉離子
6.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
「電解質」是因為下列哪一種粒子在水溶液中移動而導電?
電子
質子
離子
分子
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
某一水溶液中混有0.1莫耳氫氧化鈉(NaOH)及0.1莫耳氯化鈣(CaCl2)水溶液,則溶液中帶正電荷粒子的莫耳數與帶負電荷粒子的莫耳數比為多少?
1:1
1:2
2:3
3:2
Answer explanation
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