
CH3段考複習
Quiz
•
Science
•
8th Grade
•
Practice Problem
•
Hard
卓桂如 卓桂如
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列解離方程式,何者有誤?
H2SO4→H2++ SO42-
NH4Cl→NH4++Cl-
Ca(OH)2→Ca2++2OH-
KNO3→K++NO3-
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
關於電解質在水中解離之敘述,下列何者正確?
陽離子的總數量必等於陰離子的總數量
陽離子的總質量必等於陰離子的總質量
陽離子的總電量必等於陰離子的總電量
溶液中氫離子的濃度必等於氫氧根離子的濃度
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
某一電解質溶於水後的離子分布,如右圖所示,若綠球為陽離子,黃球為陰離子,試判斷此電解質可能是下列何者?
NaOH
H2SO4
Ca(OH)2
MgSO4
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
金屬元素X、非金屬元素Y 及離子Xm+、Yn-的電子數如表所示,當Xm+與Yn-形成化合物時,其化學式為何?
XY
X2Y
XY2
X2Y2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
在室溫下,下列關於溶液pH值與溶液體積(V)的關係圖何者正確?
圖一為鹽酸加水稀釋的過程
圖二為氫氧化鈉加水稀釋的過程
圖三為小蘇打加水稀釋的過程
圖三為食鹽加水稀釋的過程
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列哪一個反應沒有酸鹼中和的現象?
口含吸管對著氫氧化鈉溶液吹氣
農夫利用草木灰改善土質
胃酸分泌過多,服用含有小蘇打的胃藥
使用乾粉滅火器來撲滅火災
Answer explanation
口含吸管對著氫氧化鈉溶液吹氣為酸鹼中和反應,CO2溶於水成為碳酸,碳酸漢卿氧化鈉,產生碳酸鈉Na2CO3和水。
農夫利用草木灰(成份為碳酸鈣K2CO3),和酸性土壤中和,可以改善土質,增加產量。
胃酸(成份為鹽酸HCl)分泌過多時,服用含有小蘇打(NaHCO3)的胃藥,中和胃酸。
乾粉滅火器受熱分解產生碳酸鈉、水、二氧化碳,2NaHCO3→Na2CO3+H2O+CO2。
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列哪一組反應後,會產生在常溫、常壓下比空氣輕的氣體?
大理石和稀硫酸
銅片和濃硝酸
鋅和稀鹽酸
雙氧水和二氧化錳
Answer explanation
4HNO3(濃) + Cu → Cu(NO3)2+ 2H2O + 2NO2
8HNO3(稀) + 3Cu → 3Cu(NO3)2 + 4H2O + 2NO
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