國中 解答

以下反應:N2O4 +熱 2NO2,在密閉容器內達成平衡狀態,當降低溫度時,此時容器內的反應如何進行?且顏色如何改變?

已知某可逆反應式為:A+B+熱C+D,當密閉系統達成平衡後,下列何者敘述錯誤?

取一廣口瓶並裝七分滿的水,隨後將瓶口加蓋,靜置於桌上,三天後廣口瓶內的水位幾乎不變。此時,關於瓶內的水,下列敘述何者正確的有幾項? (甲)瓶內的水停止蒸發 (乙)瓶內的水蒸氣停止凝結 (丙)瓶內蒸發和凝結的速率相等 (丁)再靜置一週水位也不會改變 (戊)溫度升高時,蒸發和凝結的速率仍然不變 (己)若將瓶蓋打開,瓶內蒸發和凝結的速率不相等 (庚)若將瓶蓋打開,瓶內水位仍不會改變 (辛)若將瓶蓋打開,蒸發和凝結可以達成平衡

下列哪項物質可使蔗糖脫水形成黑色的碳?

製作麵包時會在麵糰中加入一種白色粉末,可使麵糰受熱膨脹,此粉末的成分是?

將生石灰放入硫酸溶液後產生的白色沉澱,俗稱叫做?

在『雙氧水加入二氧化錳製造氣體』的實驗中,下列敘述何者正確的有幾項? (甲)沒有加入二氧化錳反應不會發生 (乙)加入二氧化錳氣體產生速率加快 (丙)二氧化錳可提高產物的量 (丁)二氧化錳沒有參與反應 (戊)二氧化錳在反應前後質量不變 (己)改用紅蘿蔔代替二氧化錳可得到相同效果

下列哪一項化學反應所產生的氣體收集後,以火柴點火是可燃的並產生爆鳴聲?

發泡錠的特殊配方,能讓錠劑碰到水後發生反應產生氣體,大量氣體可以讓發泡錠在短時間內崩散成小顆粒,而快速溶解於水中,這種現象的原理與下列哪項原理相同?

若有一未知溶液的pH值=11,則下列敘述何者正確?

欲配製0.1M的NaOH (分子量40)水溶液100 mL,下列哪一個才是正確的方法?

鹽酸與氫氧化鈉的中和反應中,有參與反應的粒子為哪些?

將一罐汽水打開後靜置,因壓力降低造成二氧化碳氣體溶解度不斷下降,則汽水中氫離子濃度與pH值的變化,下列何者正確?

CaO溶於水後,水溶液中將含有哪些粒子?(甲) Ca2+ (乙)O2- (丙) H2O (丁) H+ (戊) OH-

有A、B兩種水溶液,已知pH值A < B < 7,則下列何者正確?

濃度皆為1M的下列四種物質,何者的pH值最大?

In what order does the reading talk about alligators and crocodiles? a. Their lifestyles. b. The same things about them. c. Where do they live? d. Telling the differences of them.

Which is true about the shape of the snouts between alligators and crocodiles?

Which is true about reptiles?

What can we learn from the reading about crocodiles and alligators?

What is main idea of this reading?

Jack is going to meet Dr. Abel at 10:00 AM on Wednesday. When he arrives, the nurse tells him that Dr. Abel is late and asks Jack to see a different doctor. Which room may he go to?

If you want to see Dr. Audrey in the morning, which days can you go? if 如果

Tom made a time to see Dr. Webber on Tuesday morning. However, the hospital called to change the time because Dr. Webber was sick. Tom got a new time in the afternoon on the same day. Which doctor will Tom see?